27256

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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

Contents

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

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