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EPROM 27256 & 27C256 (DIP28, 600mil)
{| style="float: right;" border="1" cellpadding="4" cellspacing="0" class="sortable"
|+ style="background:silver" | Cross-Reference
!BRAND
!TAG
!NUMBER
!PIN COUNT
!MARKINGS
|-
|AMD || Am || 27256 || DIP28-600mil LCC32 || Am27256 Am27256HV
|-
|AMD || Am || 27C256 || DIP28-600mil LCC32 || Am27C256
|-
|AMD || Am || 27H256 || DIP28-600mil LCC32 || Am27H256
|-
|AMD || Am || 27P256 || DIP28-600mil LCC32 || Am27P256
|-
|Amic || A || 275308 || DIP28-600mil LCC32 || A275308 A275308L
|-
|ASI || SMJ || 27C256 || DIP28-600mil || SMJ27C256
|-
|Atmel || AT || 27256 || DIP28-600mil LCC32 || AT27256
|-
|Atmel || AT || 27BV256 || DIP28-600mil LCC32 SOIC28 TSOP28 || AT27BV256
|-
|Atmel || AT || 27C256 || DIP28-600mil LCC32 || AT27C256 AT27C256R
|-
|Atmel || AT || 27HC256 || DIP28-600mil LCC32 || AT27HC256 AT27HC256L AT27HC256R
|-
|Atmel || AT || 29C256 || DIP28-600mil LCC32 SOIC28 TSOP28 || AT29C256
|-
|Atmel || AT || 27LV256 || DIP28-600mil LCC32 SOIC28 TSOP32 || AT27LV256 AT27LV256A AT27LV256R
|-
|Bosh || B || 57605 || DIP28-600mil || B57605 B57654 B57696 B57701<br>B57764 B57808 B57922 B57960 B57995
|-
|Bosh || B || 58014 || DIP28-600mil || B58014 B58038 B58150 B58185<br>B58234 B58235 B58539 B58545
|-
|Catalyst || CAT || 27256 || DIP28-600mil LCC32 || CAT27256
|-
|Catalyst || CAT || 27HC256 || DIP28-600mil LCC32 || CAT27HC256 CAT27HC256L
|-
|Cypress || CY || 27C256 || DIP28-600mil LCC32 TSOP28 TSOP32 || CY27C256 CY27C256A CY27C256T
|-
|Cypress || CY || 27H256 || DIP28-300mil DIP28-600mil LCC32 TSOP28 || CY27H256
|-
|Cypress || CY || 7C271 || DIP28-300mil LCC32 || CY7C271 CY7C271A
|-
|Cypress || CY || 7C274 || DIP28-600mil LCC32 || CY7C274
|-
|Exodus Microel. || EM || 27C256 || DIP28-600mil || EM27C256
|-
|Fairchild || FM || 27C256 || DIP28-600mil LCC32 || FM27C256
|-
|Fairchild || NM || 27C256 || DIP28-600mil || NM27C256 NM27C256B NM27LC256
|-
|Fairchild || NM || 87C257 || DIP28-600mil LCC32 || NM87C257
|-
|Fujitsu || MBM || 27256 || DIP28-600mil LCC32 || MBM27256
|-
|Fujitsu || MBM || 27C256 || DIP28-600mil SOIC28 LCC32 || MBM27C256 MBM27C256A MBM27C256AP MBM27C256H
|-
|General Instr. ||  || 27256 || DIP28-600mil || 27256
|-
|General Instr. ||  || 27C256 || DIP28-600mil LCC32 || 27C256
|-
|Greenwich Instr. || GR || 27256 || DIP28-600mil || GR27256
|-
|Hitachi || HN || 27256 || DIP28-600mil || HN27256 HN27256G HN27256P
|-
|Hitachi || HN || 27C256 || DIP28-600mil SOIC28 || HN27C256 HN27C256A HN27C256AG HN27C256AP<br>HN27C256G HN27C256H HN27C256HG HN27C256HP<br>HN27C256P
|-
|Honeywell || E || 27C256 || LCC32 || 4055857 TT E27C256
|-
|ICT || ICT || 27CX256 || DIP28-600mil LCC32 || ICT27CX256 27CX256
|-
|Intel || D/I || 27256 || DIP28-600mil || i27256 D27256 LD27256<br>MD27256 P27256 QD27256<br>TD27256 27256A
|-
|Intel || D/I || 27C256 || DIP28-600mil LCC32 TSOP32 || i27C256 AD27C256 AN27C256 AP27C256<br>D27C256 L27C256 LD27C256 MD27C256<br>N27C256 P27C256 QD27C256 T27C256<br>TD27C256 TN27C256 TP27C256 27C256A
|-
|Intel || D/I || 68C257 || DIP28-600mil LCC32 || i68C257 A68C257
|-
|Intel || D/I || 87C257 || DIP28-600mil LCC32 || i87C257 AD87C257 AN87C257 BD87C257<br>D87C257 LD87C257 LN87C257 QN87C257<br>T87C257
|-
|ISSI || IS || 27C256 || DIP28-600mil LCC32 TSOP28 || IS27C256
|-
|ISSI || IS || 27DV256 || DIP28-600mil LCC32 TSOP28 || IS27DV256
|-
|ISSI || IS || 27HC256 || DIP28-600mil LCC32 TSOP28 || IS27HC256
|-
|ISSI || IS || 27LV256 || DIP28-600mil LCC32 TSOP28 || IS27LV256
|-
|Macronix|| MX || 27C256 || DIP28-600mil LCC32 TSOP28 || MX27C256
|-
|Macronix|| MX || 27L256 || DIP28-600mil LCC32 TSOP28 || MX27L256
|-
|Microchip||  || 27256 || DIP28-600mil LCC32 || 27256
|-
|Microchip||  || 27C256 || DIP28-600mil LCC32 SOIC28 || 27C256 27C256A
|-
|Microchip||  || 27HC256 || DIP28-600mil LCC32 SOIC28 TSOP28 || 27HC256
|-
|Microchip||  || 27LV256 || DIP28-600mil LCC32 SOIC28 || 27LV256
|-
|Mitsubishi|| M5L || 27256 || DIP28-600mil || M5L27256 M5L27256K
|-
|Mitsubishi|| M5M || 27C256 || DIP28-600mil SOIC28 TSOP28 || M5M27C256 M5M27C256A M5M27C256AK M5M27C256K
|-
|National || NM || 27C256 || DIP28-600mil LCC32 || NM27C256
|-
|National || NM || 27LC256 || DIP28-600mil LCC32 || NM27LC256
|-
|National || NMC || 27C256 || DIP28-600mil LCC32 || NMC27C256 NMC27C256B
|-
|National || NMC || 87C257 || DIP28-600mil LCC32 || NMC87C257
|-
|Nec || uPD || 27256 || DIP28-600mil || uPD27256 uPD27256A
|-
|Nec || uPD || 27C256 || DIP28-600mil SOIC28 || uPD27C256 uPD27C256A
|-
|Oki || MSM || 27256 || DIP28-600mil || MSM27256 MSM27256A MSM27256HZB<br>MSM27256ZB MSM27256ZC
|-
|Oki || MSM || 27C256 || DIP28-600mil LLC32 || MSM27C256 MSM27C256H<br>MSM27C256HZB  MSM27C256ZB
|-
|Omni-Wave || OW || 27C256 || DIP28-600mil LLC32 || OW27C256
|-
|Panatech || RD || 27C256 || DIP28-600mil || RD27C256
|-
|Philips || NXP || 27C256 || DIP28-600mil LLC32 || 27C256 NXP27C256
|-
|QP Semiconductor || QP || 27C256 || DIP28-600mil LLC32 || QP27C256
|-
|Ricoh || RD || 27C256 || DIP28-600mil LLC32 || RD27C256
|-
|SEEQ ||  || 82063 || DIP28-600mil || 82063 86063
|-
|SEEQ || DQ || 27256 || DIP28-600mil || DQ27256
|-
|SEEQ || DQ || 27C256 || DIP28-600mil LLC32 || DQ27C256 E27C256 LE27C256 M27C256
|-
|ST Microelectronics || M || 27256 || DIP28-600mil || M27256
|-
|ST Microelectronics || M || 27C256 || DIP28-600mil LCC32 TSOP28 || M27C256 M27C256B
|-
|ST Microelectronics || M || 27V256 || DIP28-600mil LCC32 TSOP28 || M27V256
|-
|ST Microelectronics || M || 27W256 || DIP28-600mil LCC32 TSOP28 || M27W256
|-
|Signetics || S || 27C256 || DIP28-600mil LCC32 || S27C256
|-
|SMOS || SPM || 27C256 || DIP28-600mil || SPM27C256 SPM27C256H
|-
|Sony || CXK || 27C256 || DIP28-600mil || CXK27C256 CXK27C256DQ
|-
|Sperry || E || 27C256 || LCC32 || 4055857 TT E27C256
|-
|Texas Instr. || SMJ || 27C256 || DIP28-600mil || SMJ27C256
|-
|Texas Instr. || TMS || 27C256 || DIP28-600mil LCC32 || TMS27C256 TMS27PC256
|-
|Texas Instr. || TMS || 87C257 || DIP28-600mil || TMS87C257
|-
|Toshiba || TC || 24256 || DIP28-600mil || TC24256
|-
|Toshiba || TC || 54256 || DIP28-600mil SOIC28 || TC54256A
|-
|Toshiba || TC || 57256 || DIP28-600mil || TC57256 TC57256A TC57256AD TC57H256
|-
|Toshiba || TMM || 24256 || DIP28-600mil SOIC28 || TMM24256 TMM24256A<br>TMM24256AF TMM24256AP TMM24256B
|-
|Toshiba || TMM || 27256 || DIP28-600mil || TMM27256 TMM27256A TMM27256B TMM27256D
|-
|USSR || K573 || RF7 || DIP28 || K573RF7 K573RF8
|-
|USSR || K1626 || RF3 || DIP28 || K1626RF3
|-
|VLSI || VT || 27C256 || DIP28-600mil || VT27C256
|-
|WSI || WS || 27C256 || DIP28-600mil LCC32 || WS27C256F WS27C256L
|-
|WSI || WS || 57C71 || DIP28-600mil LCC32 || WS57C71C
|}


256Kb, 32KB (32.768 byte), 8000 hex 8 bit
'''EPROM 27256 & 27C256'''


pinout
=Size=
{| border="1" cellpadding="4" cellspacing="0"
|-align="left"
!bit
!Byte
!Hex organization
|-
|256Kb || 32KB (32.768 byte) || 8000hex8
|}
 
=Pinout=
<pre>
<pre>
    +--\/--+
      DIP28-300mil (all the others)
Vpp |1  28| Vcc
      DIP28-600mil
A12 |2  27| A14
      SOIC28-330mil
A7  |3  26| A13
        +--\/--+
A6  |4  25| A8
    Vpp |1  28| Vcc
A5  |5  24| A9
    A12 |2  27| A14
A4  |6  23| A11
    A7  |3  26| A13
A3  |7  22| *OE
    A6  |4  25| A8
A2  |8  21| A10
    A5  |5  24| A9
A1  |9  20| *CE
    A4  |6  23| A11
A0  |10  19| O7
    A3  |7  22| *OE
O0  |11  18| 06
    A2  |8  21| A10
O1  |12  17| O5
    A1  |9  20| *CE/*PGM
O2  |13  16| O4
    A0  |10  19| O7
GND |14  15| O3
    O0  |11  18| O6
     +------+</pre>
    O1  |12  17| O5
    O2  |13  16| O4
    GND |14  15| O3
        +------+
 
      DIP28-300mil (only CY7C271)
        +--\/--+
    A9  |1  28| Vcc
    A8  |2  27| A10
    A7  |3  26| A11
    A6  |4  25| A12
    A5  |5  24| A13
    A4  |6  23| A14
    A3  |7  22| *CS1
    A2  |8  21| CS2
    A1  |9  20| *CE
    A0  |10  19| O7
    O0  |11  18| O6
    O1  |12  17| O5
    O2  |13  16| O4
    GND |14  15| O3
        +------+
 
    LCC32-450x550mil (all the others)
+-------------------------------------------+
|  5 A6  |        | 21 DQ6      |        |
|  6 A5  | 14 DQ1  | 22 DQ7      | 30 A13  |
|  7 A4  | 15 DQ2  | 23 *CE/*PGM | 31 A14  |
|  8 A3  | 16 GND  | 24 A10      | 32 Vcc  |
|  9 A2  | 17 NC  | 25 *OE      |  1 NC  |
| 10 A1  | 18 DQ3  | 26 NC      |  2 Vpp  |
| 11 A0  | 19 DQ4  | 27 A11      |  3 A12  |
| 12 NC  | 20 DQ5  | 28 A9      |  4 A7  |
| 13 DQ0  |        | 29 A8      |        |
+-------------------------------------------+
 
     LCC32-450x550mil (only CY7C271)
+----------------------------------------+
|  5 A6  |        | 21 DQ6  |        |
|  6 A5  | 14 DQ1  | 22 DQ7  | 30 A13  |
|  7 A4  | 15 DQ2  | 23 *CE  | 31 A14  |
|  8 A3  | 16 GND  | 24 CS2  | 32 Vcc  |
|  9 A2  | 17 NC  | 25 *CS1  |  1 NC  |
| 10 A1  | 18 DQ3  | 26 NC    |  2 Vpp  |
| 11 A0  | 19 DQ4  | 27 A11  |  3 A12  |
| 12 NC  | 20 DQ5  | 28 A9    |  4 A7  |
| 13 DQ0  |        | 29 A8    |        |
+----------------------------------------+
 
        TSOP28 Type1 8x12 (only AT27BV256)
        +-------------+
    *OE |22        21| A10
    A11 |23        20| *CE
      A9 |24        19| O7
      A8 |25        18| O6
    A13 |26        17| O5
    A14 |27        16| O4
    Vcc |28        15| O3
*WE/Vpp | 1 []      14| GND
    A12 | 2        13| O2
      A7 | 3        12| O1
      A6 | 4        11| O0
      A5 | 5        10| A0
      A4 | 6          9| A1
      A3 | 7          8| A2
        +-------------+
 
        TSOP32 Type1 8x20
        +-------------+
    *OE | 1 []      32| NC
    A11 | 2        31| A10
      A9 | 3        30| *CE
      A8 | 4        29| O7
    A13 | 5        28| O6
      NC | 6        27| O5
    A14 | 7        26| O4
    Vcc | 8        25| O3
    Vpp | 9        24| GND
      NC |10        23| O2
    A12 |11        22| O1
      A7 |12        21| O0
      A6 |13        20| NC
      A5 |14        19| A0
      A4 |15        18| A1
      A3 |16        17| A2
        +-------------+
</pre>
 
=External links=
[https://en.wikipedia.org/wiki/EPROM EPROM page on wikipedia]


[[Image:dip28-600mil.jpg]]
=Files=
<gallery widths="150px">
File:a68c257.pdf|A68C257 Datasheet
File:a275308.pdf|A275308 Datasheet
File:am27256.pdf|AM27256 Datasheet
File:am27c256.pdf|AM27C256 Datasheet
File:am27h256.pdf|AM27H256 Datasheet
File:at27bv256.pdf|AT27BV256 Datasheet
File:at27256.pdf|AT27256 Datasheet
File:at27c256.pdf|AT27C256 Datasheet
File:at27lv256a.pdf|AT27LV256A Datasheet
File:at29c256.pdf|AT29C256 Datasheet
File:cat27256.pdf|CAT27256 Datasheet
File:cxk27c256.pdf|CXK27C256 Datasheet
File:cy7c271-274.pdf|CY7C271-274 Datasheet
File:cy7c291a.pdf|CY7C291A Datasheet
File:cy7c292.pdf|CY7C292 Datasheet
File:cy7c293a.pdf|CY7C293A Datasheet
File:cy27c256.pdf|CY27C256 Datasheet
File:cy27h256.pdf|CY27H256 Datasheet
File:d27256.pdf|D27256 Datasheet
File:d27c256.pdf|D27C256 Datasheet
File:em27c256.pdf|EM27C256 Datasheet
File:fm27c256.pdf|FM27C256 Datasheet
File:hn27c256a.pdf|HN27C256A Datasheet
File:hn27c256ag.pdf|HN27C256AG Datasheet
File:is27c256.pdf|IS27C256 Datasheet
File:is27dv256.pdf|IS27DV256 Datasheet
File:is27hc256.pdf|IS27HC256 Datasheet
File:is27lv256.pdf|IS27LV256 Datasheet
File:m5l27256.pdf|M5L27256 Datasheet
File:m5m27c256k.pdf|M5M27C256K Datasheet
File:m27256.pdf|M27256 Datasheet
File:m27c256b.pdf|M27C256B Datasheet
File:m27v256.pdf|M27V256 Datasheet
File:m27w256.pdf|M27W256 Datasheet
File:mbm27256.pdf|MBM27256 Datasheet
File:mbm27c256.pdf|MBM27C256 Datasheet
File:mc27c256.pdf|MC27C256 Datasheet
File:mc27hc256.pdf|MC27HC256 Datasheet
File:mc27lv256.pdf|MC27LV256 Datasheet
File:msm27256.pdf|MSM27256 Datasheet
File:msm27c256.pdf|MSM27C256 Datasheet
File:mx27c256.pdf|MX27C256 Datasheet
File:mx27l256.pdf|MX27L256 Datasheet
File:nm27c256-fai.pdf|NM27C256 Fairchild Datasheet
File:nm27c256-nat.pdf|NM27C256 National Datasheet
File:nm27lc256-fai.pdf|NM27LC256 Fairchild Datasheet
File:nm27lc256-nat.pdf|NM27LC256 National Datasheet
File:nmc27c256.pdf|NMC27C256 Datasheet
File:nmc87c257.pdf|NMC87C257 Datasheet
File:nxp27c256.pdf|NXP27C256 Datasheet
File:qp27c256.pdf|QP27LV256 Datasheet
File:s27c256.pdf|S27C256 Datasheet
File:seeq27c256.pdf|SEEQ 27C256 Datasheet
File:seeqm27c256.pdf|SEEQ M27C256 Datasheet
File:smj27c256-asi.pdf|SMJ27C256 ASI Datasheet
File:smj27c256-ti.pdf|SMJ27C256 TEXAS Datasheet
File:spm27c256.pdf|SPM27C256 Datasheet
File:tc54256.pdf|TC54256 Datasheet
File:tc57256.pdf|TC57256 Datasheet
File:tmm24256a.pdf|TMM24256A Datasheet
File:tmm27256.pdf|TMM27256 Datasheet
File:tms27c-pc256.pdf|TMS27C/PC256 Datasheet
File:tms87c257.pdf|TMS87C257 Datasheet
File:upd27256.pdf|uPD27256 Datasheet
File:upd27c256.pdf|uPD27C256 Datasheet
File:ws27c256.pdf|WS27C256 Datasheet
File:ws57c71c.pdf|WS57C71C Datasheet
</gallery>


[[Category:ROM]]
[[Category:EPROM]]
[[Category:DIP28-300mil]]
[[Category:DIP28-600mil]]
[[Category:DIP28-600mil]]
[[Category:LCC32-450x550mil]]
[[Category:SOIC28-330mil]]
[[Category:TSOP-I-28-8x12mm]]
[[Category:TSOP-I-32-8x20mm]]

Latest revision as of 15:21, 18 December 2017

Cross-Reference
BRAND TAG NUMBER PIN COUNT MARKINGS
AMD Am 27256 DIP28-600mil LCC32 Am27256 Am27256HV
AMD Am 27C256 DIP28-600mil LCC32 Am27C256
AMD Am 27H256 DIP28-600mil LCC32 Am27H256
AMD Am 27P256 DIP28-600mil LCC32 Am27P256
Amic A 275308 DIP28-600mil LCC32 A275308 A275308L
ASI SMJ 27C256 DIP28-600mil SMJ27C256
Atmel AT 27256 DIP28-600mil LCC32 AT27256
Atmel AT 27BV256 DIP28-600mil LCC32 SOIC28 TSOP28 AT27BV256
Atmel AT 27C256 DIP28-600mil LCC32 AT27C256 AT27C256R
Atmel AT 27HC256 DIP28-600mil LCC32 AT27HC256 AT27HC256L AT27HC256R
Atmel AT 29C256 DIP28-600mil LCC32 SOIC28 TSOP28 AT29C256
Atmel AT 27LV256 DIP28-600mil LCC32 SOIC28 TSOP32 AT27LV256 AT27LV256A AT27LV256R
Bosh B 57605 DIP28-600mil B57605 B57654 B57696 B57701
B57764 B57808 B57922 B57960 B57995
Bosh B 58014 DIP28-600mil B58014 B58038 B58150 B58185
B58234 B58235 B58539 B58545
Catalyst CAT 27256 DIP28-600mil LCC32 CAT27256
Catalyst CAT 27HC256 DIP28-600mil LCC32 CAT27HC256 CAT27HC256L
Cypress CY 27C256 DIP28-600mil LCC32 TSOP28 TSOP32 CY27C256 CY27C256A CY27C256T
Cypress CY 27H256 DIP28-300mil DIP28-600mil LCC32 TSOP28 CY27H256
Cypress CY 7C271 DIP28-300mil LCC32 CY7C271 CY7C271A
Cypress CY 7C274 DIP28-600mil LCC32 CY7C274
Exodus Microel. EM 27C256 DIP28-600mil EM27C256
Fairchild FM 27C256 DIP28-600mil LCC32 FM27C256
Fairchild NM 27C256 DIP28-600mil NM27C256 NM27C256B NM27LC256
Fairchild NM 87C257 DIP28-600mil LCC32 NM87C257
Fujitsu MBM 27256 DIP28-600mil LCC32 MBM27256
Fujitsu MBM 27C256 DIP28-600mil SOIC28 LCC32 MBM27C256 MBM27C256A MBM27C256AP MBM27C256H
General Instr. 27256 DIP28-600mil 27256
General Instr. 27C256 DIP28-600mil LCC32 27C256
Greenwich Instr. GR 27256 DIP28-600mil GR27256
Hitachi HN 27256 DIP28-600mil HN27256 HN27256G HN27256P
Hitachi HN 27C256 DIP28-600mil SOIC28 HN27C256 HN27C256A HN27C256AG HN27C256AP
HN27C256G HN27C256H HN27C256HG HN27C256HP
HN27C256P
Honeywell E 27C256 LCC32 4055857 TT E27C256
ICT ICT 27CX256 DIP28-600mil LCC32 ICT27CX256 27CX256
Intel D/I 27256 DIP28-600mil i27256 D27256 LD27256
MD27256 P27256 QD27256
TD27256 27256A
Intel D/I 27C256 DIP28-600mil LCC32 TSOP32 i27C256 AD27C256 AN27C256 AP27C256
D27C256 L27C256 LD27C256 MD27C256
N27C256 P27C256 QD27C256 T27C256
TD27C256 TN27C256 TP27C256 27C256A
Intel D/I 68C257 DIP28-600mil LCC32 i68C257 A68C257
Intel D/I 87C257 DIP28-600mil LCC32 i87C257 AD87C257 AN87C257 BD87C257
D87C257 LD87C257 LN87C257 QN87C257
T87C257
ISSI IS 27C256 DIP28-600mil LCC32 TSOP28 IS27C256
ISSI IS 27DV256 DIP28-600mil LCC32 TSOP28 IS27DV256
ISSI IS 27HC256 DIP28-600mil LCC32 TSOP28 IS27HC256
ISSI IS 27LV256 DIP28-600mil LCC32 TSOP28 IS27LV256
Macronix MX 27C256 DIP28-600mil LCC32 TSOP28 MX27C256
Macronix MX 27L256 DIP28-600mil LCC32 TSOP28 MX27L256
Microchip 27256 DIP28-600mil LCC32 27256
Microchip 27C256 DIP28-600mil LCC32 SOIC28 27C256 27C256A
Microchip 27HC256 DIP28-600mil LCC32 SOIC28 TSOP28 27HC256
Microchip 27LV256 DIP28-600mil LCC32 SOIC28 27LV256
Mitsubishi M5L 27256 DIP28-600mil M5L27256 M5L27256K
Mitsubishi M5M 27C256 DIP28-600mil SOIC28 TSOP28 M5M27C256 M5M27C256A M5M27C256AK M5M27C256K
National NM 27C256 DIP28-600mil LCC32 NM27C256
National NM 27LC256 DIP28-600mil LCC32 NM27LC256
National NMC 27C256 DIP28-600mil LCC32 NMC27C256 NMC27C256B
National NMC 87C257 DIP28-600mil LCC32 NMC87C257
Nec uPD 27256 DIP28-600mil uPD27256 uPD27256A
Nec uPD 27C256 DIP28-600mil SOIC28 uPD27C256 uPD27C256A
Oki MSM 27256 DIP28-600mil MSM27256 MSM27256A MSM27256HZB
MSM27256ZB MSM27256ZC
Oki MSM 27C256 DIP28-600mil LLC32 MSM27C256 MSM27C256H
MSM27C256HZB MSM27C256ZB
Omni-Wave OW 27C256 DIP28-600mil LLC32 OW27C256
Panatech RD 27C256 DIP28-600mil RD27C256
Philips NXP 27C256 DIP28-600mil LLC32 27C256 NXP27C256
QP Semiconductor QP 27C256 DIP28-600mil LLC32 QP27C256
Ricoh RD 27C256 DIP28-600mil LLC32 RD27C256
SEEQ 82063 DIP28-600mil 82063 86063
SEEQ DQ 27256 DIP28-600mil DQ27256
SEEQ DQ 27C256 DIP28-600mil LLC32 DQ27C256 E27C256 LE27C256 M27C256
ST Microelectronics M 27256 DIP28-600mil M27256
ST Microelectronics M 27C256 DIP28-600mil LCC32 TSOP28 M27C256 M27C256B
ST Microelectronics M 27V256 DIP28-600mil LCC32 TSOP28 M27V256
ST Microelectronics M 27W256 DIP28-600mil LCC32 TSOP28 M27W256
Signetics S 27C256 DIP28-600mil LCC32 S27C256
SMOS SPM 27C256 DIP28-600mil SPM27C256 SPM27C256H
Sony CXK 27C256 DIP28-600mil CXK27C256 CXK27C256DQ
Sperry E 27C256 LCC32 4055857 TT E27C256
Texas Instr. SMJ 27C256 DIP28-600mil SMJ27C256
Texas Instr. TMS 27C256 DIP28-600mil LCC32 TMS27C256 TMS27PC256
Texas Instr. TMS 87C257 DIP28-600mil TMS87C257
Toshiba TC 24256 DIP28-600mil TC24256
Toshiba TC 54256 DIP28-600mil SOIC28 TC54256A
Toshiba TC 57256 DIP28-600mil TC57256 TC57256A TC57256AD TC57H256
Toshiba TMM 24256 DIP28-600mil SOIC28 TMM24256 TMM24256A
TMM24256AF TMM24256AP TMM24256B
Toshiba TMM 27256 DIP28-600mil TMM27256 TMM27256A TMM27256B TMM27256D
USSR K573 RF7 DIP28 K573RF7 K573RF8
USSR K1626 RF3 DIP28 K1626RF3
VLSI VT 27C256 DIP28-600mil VT27C256
WSI WS 27C256 DIP28-600mil LCC32 WS27C256F WS27C256L
WSI WS 57C71 DIP28-600mil LCC32 WS57C71C

EPROM 27256 & 27C256

Size

bit Byte Hex organization
256Kb 32KB (32.768 byte) 8000hex8

Pinout

       DIP28-300mil (all the others)
       DIP28-600mil
      SOIC28-330mil
         +--\/--+
     Vpp |1   28| Vcc
     A12 |2   27| A14
     A7  |3   26| A13
     A6  |4   25| A8
     A5  |5   24| A9
     A4  |6   23| A11
     A3  |7   22| *OE
     A2  |8   21| A10
     A1  |9   20| *CE/*PGM
     A0  |10  19| O7
     O0  |11  18| O6
     O1  |12  17| O5
     O2  |13  16| O4
     GND |14  15| O3
         +------+

       DIP28-300mil (only CY7C271)
         +--\/--+
     A9  |1   28| Vcc
     A8  |2   27| A10
     A7  |3   26| A11
     A6  |4   25| A12
     A5  |5   24| A13
     A4  |6   23| A14
     A3  |7   22| *CS1
     A2  |8   21| CS2
     A1  |9   20| *CE
     A0  |10  19| O7
     O0  |11  18| O6
     O1  |12  17| O5
     O2  |13  16| O4
     GND |14  15| O3
         +------+

    LCC32-450x550mil (all the others)
+-------------------------------------------+
|  5 A6   |         | 21 DQ6      |         |
|  6 A5   | 14 DQ1  | 22 DQ7      | 30 A13  |
|  7 A4   | 15 DQ2  | 23 *CE/*PGM | 31 A14  |
|  8 A3   | 16 GND  | 24 A10      | 32 Vcc  |
|  9 A2   | 17 NC   | 25 *OE      |  1 NC   |
| 10 A1   | 18 DQ3  | 26 NC       |  2 Vpp  |
| 11 A0   | 19 DQ4  | 27 A11      |  3 A12  |
| 12 NC   | 20 DQ5  | 28 A9       |  4 A7   |
| 13 DQ0  |         | 29 A8       |         |
+-------------------------------------------+

    LCC32-450x550mil (only CY7C271)
+----------------------------------------+
|  5 A6   |         | 21 DQ6   |         |
|  6 A5   | 14 DQ1  | 22 DQ7   | 30 A13  |
|  7 A4   | 15 DQ2  | 23 *CE   | 31 A14  |
|  8 A3   | 16 GND  | 24 CS2   | 32 Vcc  |
|  9 A2   | 17 NC   | 25 *CS1  |  1 NC   |
| 10 A1   | 18 DQ3  | 26 NC    |  2 Vpp  |
| 11 A0   | 19 DQ4  | 27 A11   |  3 A12  |
| 12 NC   | 20 DQ5  | 28 A9    |  4 A7   |
| 13 DQ0  |         | 29 A8    |         |
+----------------------------------------+

        TSOP28 Type1 8x12 (only AT27BV256)
         +-------------+
     *OE |22         21| A10
     A11 |23         20| *CE
      A9 |24         19| O7
      A8 |25         18| O6
     A13 |26         17| O5
     A14 |27         16| O4
     Vcc |28         15| O3
 *WE/Vpp | 1 []      14| GND
     A12 | 2         13| O2
      A7 | 3         12| O1
      A6 | 4         11| O0
      A5 | 5         10| A0
      A4 | 6          9| A1
      A3 | 7          8| A2
         +-------------+

        TSOP32 Type1 8x20
         +-------------+
     *OE | 1 []      32| NC
     A11 | 2         31| A10
      A9 | 3         30| *CE
      A8 | 4         29| O7
     A13 | 5         28| O6
      NC | 6         27| O5
     A14 | 7         26| O4
     Vcc | 8         25| O3
     Vpp | 9         24| GND
      NC |10         23| O2
     A12 |11         22| O1
      A7 |12         21| O0
      A6 |13         20| NC
      A5 |14         19| A0
      A4 |15         18| A1
      A3 |16         17| A2
         +-------------+

External links

EPROM page on wikipedia

Files

  • A68C257 Datasheet

    A68C257 Datasheet

  • A275308 Datasheet

    A275308 Datasheet

  • AM27256 Datasheet

    AM27256 Datasheet

  • AM27C256 Datasheet

    AM27C256 Datasheet

  • AM27H256 Datasheet

    AM27H256 Datasheet

  • AT27BV256 Datasheet

    AT27BV256 Datasheet

  • AT27256 Datasheet

    AT27256 Datasheet

  • AT27C256 Datasheet

    AT27C256 Datasheet

  • AT27LV256A Datasheet

    AT27LV256A Datasheet

  • AT29C256 Datasheet

    AT29C256 Datasheet

  • CAT27256 Datasheet

    CAT27256 Datasheet

  • CXK27C256 Datasheet

    CXK27C256 Datasheet

  • CY7C271-274 Datasheet

    CY7C271-274 Datasheet

  • CY7C291A Datasheet

    CY7C291A Datasheet

  • CY7C292 Datasheet

    CY7C292 Datasheet

  • CY7C293A Datasheet

    CY7C293A Datasheet

  • CY27C256 Datasheet

    CY27C256 Datasheet

  • CY27H256 Datasheet

    CY27H256 Datasheet

  • D27256 Datasheet

    D27256 Datasheet

  • D27C256 Datasheet

    D27C256 Datasheet

  • EM27C256 Datasheet

    EM27C256 Datasheet

  • FM27C256 Datasheet

    FM27C256 Datasheet

  • HN27C256A Datasheet

    HN27C256A Datasheet

  • HN27C256AG Datasheet

    HN27C256AG Datasheet

  • IS27C256 Datasheet

    IS27C256 Datasheet

  • IS27DV256 Datasheet

    IS27DV256 Datasheet

  • IS27HC256 Datasheet

    IS27HC256 Datasheet

  • IS27LV256 Datasheet

    IS27LV256 Datasheet

  • M5L27256 Datasheet

    M5L27256 Datasheet

  • M5M27C256K Datasheet

    M5M27C256K Datasheet

  • M27256 Datasheet

    M27256 Datasheet

  • M27C256B Datasheet

    M27C256B Datasheet

  • M27V256 Datasheet

    M27V256 Datasheet

  • M27W256 Datasheet

    M27W256 Datasheet

  • MBM27256 Datasheet

    MBM27256 Datasheet

  • MBM27C256 Datasheet

    MBM27C256 Datasheet

  • MC27C256 Datasheet

    MC27C256 Datasheet

  • MC27HC256 Datasheet

    MC27HC256 Datasheet

  • MC27LV256 Datasheet

    MC27LV256 Datasheet

  • MSM27256 Datasheet

    MSM27256 Datasheet

  • MSM27C256 Datasheet

    MSM27C256 Datasheet

  • MX27C256 Datasheet

    MX27C256 Datasheet

  • MX27L256 Datasheet

    MX27L256 Datasheet

  • NM27C256 Fairchild Datasheet

    NM27C256 Fairchild Datasheet

  • NM27C256 National Datasheet

    NM27C256 National Datasheet

  • NM27LC256 Fairchild Datasheet

    NM27LC256 Fairchild Datasheet

  • NM27LC256 National Datasheet

    NM27LC256 National Datasheet

  • NMC27C256 Datasheet

    NMC27C256 Datasheet

  • NMC87C257 Datasheet

    NMC87C257 Datasheet

  • NXP27C256 Datasheet

    NXP27C256 Datasheet

  • QP27LV256 Datasheet

    QP27LV256 Datasheet

  • S27C256 Datasheet

    S27C256 Datasheet

  • SEEQ 27C256 Datasheet

    SEEQ 27C256 Datasheet

  • SEEQ M27C256 Datasheet

    SEEQ M27C256 Datasheet

  • SMJ27C256 ASI Datasheet

    SMJ27C256 ASI Datasheet

  • SMJ27C256 TEXAS Datasheet

    SMJ27C256 TEXAS Datasheet

  • SPM27C256 Datasheet

    SPM27C256 Datasheet

  • TC54256 Datasheet

    TC54256 Datasheet

  • TC57256 Datasheet

    TC57256 Datasheet

  • TMM24256A Datasheet

    TMM24256A Datasheet

  • TMM27256 Datasheet

    TMM27256 Datasheet

  • TMS27C/PC256 Datasheet

    TMS27C/PC256 Datasheet

  • TMS87C257 Datasheet

    TMS87C257 Datasheet

  • uPD27256 Datasheet

    uPD27256 Datasheet

  • uPD27C256 Datasheet

    uPD27C256 Datasheet

  • WS27C256 Datasheet

    WS27C256 Datasheet

  • WS57C71C Datasheet

    WS57C71C Datasheet

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