AT28C256E-20PI

Manufacturer Part NumberAT28C256E-20PI
Description256K 32K x 8 Paged CMOS E2PROM
ManufacturerATMEL Corporation
AT28C256E-20PI datasheet
 
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Features
Fast Read Access Time - 150 ns
Automatic Page Write Operation
Internal Address and Data Latches for 64-Bytes
Internal Control Timer
Fast Write Cycle Times
Page Write Cycle Time: 3 ms or 10 ms Maximum
1 to 64-Byte Page Write Operation
Low Power Dissipation
50 mA Active Current
200 A CMOS Standby Current
Hardware and Software Data Protection
DATA Polling for End of Write Detection
High Reliability CMOS Technology
4
5
Endurance: 10
or 10
Cycles
Data Retention: 10 Years
Single 5V
10% Supply
CMOS and TTL Compatible Inputs and Outputs
JEDEC Approved Byte-Wide Pinout
Full Military, Commercial, and Industrial Temperature Ranges
Description
The AT28C256 is a high-performance Electrically Erasable and Programmable Read
Only Memory. Its 256K of memory is organized as 32,768 words by 8 bits. Manufac-
tured with Atmel’s advanced nonvolatile CMOS technology, the device offers access
times to 150 ns with power dissipation of just 440 mW. When the device is deselected,
the CMOS standby current is less than 200 A.
Pin Configurations
Pin Name
Function
A0 - A14
Addresses
CE
Chip Enable
OE
Output Enable
WE
Write Enable
I/O0 - I/O7
Data Inputs/Outputs
NC
No Connect
DC
Don’t Connect
PGA
Top View
Note: PLCC package pins 1 and
17 are DON’T CONNECT.
TSOP
Top View
CERDIP, PDIP,
LCC, PLCC
FLATPACK, SOIC
Top View
Top View
AT28C256
256K (32K x 8)
Paged
CMOS
2
E
PROM
(continued)
AT28C256
0006F
2-217

AT28C256E-20PI Summary of contents

  • Page 1

    ... Description The AT28C256 is a high-performance Electrically Erasable and Programmable Read Only Memory. Its 256K of memory is organized as 32,768 words by 8 bits. Manufac- tured with Atmel’s advanced nonvolatile CMOS technology, the device offers access times to 150 ns with power dissipation of just 440 mW. When the device is deselected, the CMOS standby current is less than 200 A ...

  • Page 2

    Description (Continued) The AT28C256 is accessed like a Static RAM for the read or write cycle without the need for external components. The device contains a 64-byte page register to allow writ- ing 64-bytes simultaneously. During a ...

  • Page 3

    ... All command se- quences must conform to the page write timing specifica- tions. The data in the enable and disable command se- quences is not written to the device and the memory ad- dresses used in the sequence may be written with data in either a byte or page write operation. ...

  • Page 4

    ... Device Operation (Continued) DEVICE IDENTIFICATION PROM memory are available to the user for device identification. By raising A9 to 12V dress locations 7FC0H to 7FFFH the additional bytes may be written to or read from in the same manner as the regu- lar memory array ...

  • Page 5

    AC Read Characteristics Symbol Parameter t Address to Output Delay ACC ( Output Delay CE ( Output Delay OE ( Output Float DF Output Hold from OE, CE ...

  • Page 6

    AC Write Characteristics Symbol Parameter Address, OE Set-up Time AS OES t Address Hold Time AH t Chip Select Set-up Time CS t Chip Select Hold Time CH t Write Pulse Width ( ...

  • Page 7

    Page Mode Characteristics Symbol Parameter t Write Cycle Time WC t Address Set-up Time AS t Address Hold Time AH t Data Set-up Time DS t Data Hold Time DH t Write Pulse Width WP t Byte Load Cycle Time ...

  • Page 8

    Software Data Protection Enable Algorithm LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA A0 TO ADDRESS 5555 LOAD DATA XX TO (4) ANY ADDRESS LOAD LAST BYTE TO LAST ADDRESS Notes for software program ...

  • Page 9

    Data Polling Characteristics Symbol Parameter t Data Hold Time Hold Time OEH Output Delay OE t Write Recovery Time WR Notes: 1. These parameters are characterized and not 100% tested. Data Polling Waveforms Toggle ...

  • Page 10

    AT28C256 2-226 ...

  • Page 11

    Ordering Information t I (mA) ACC CC Active Standby (ns) 150 50 0.2 50 0.3 200 50 0.2 50 0.3 250 50 0.2 50 0.3 50 0.2 Ordering Code Package AT28C256(E,F)-15JC AT28C256(E,F)-15PC 28P6 AT28C256(E,F)-15SC 28S AT28C256(E,F)-15TC AT28C256(E,F)-15JI AT28C256(E,F)-15PI 28P6 ...

  • Page 12

    Ordering Information (Continued (mA) ACC CC Active Standby (ns) (3) 150 50 0.35 50 0.35 (3) 200 50 0.35 50 0.35 (3) 250 50 0.35 AT28C256 2-228 Ordering Code Package 5962-88525 16 UX 28U 5962-88525 16 XX 28D6 ...

  • Page 13

    ... The following table lists standard Atmel products that can be ordered. Device Numbers Speed AT28C256 15 AT28C256E 15 AT28C256F 15 AT28C256 20 AT28C256E 20 AT28C256F 20 AT28C256 25 AT28C256E 25 AT28C256F 25 AT28C256 - Ordering Code 5962-88525 05 UX 5962-88525 05 XX 5962-88525 05 YX 5962-88525 05 ZX 5962-88525 03 UX 5962-88525 03 XX 5962-88525 03 YX 5962-88525 03 ZX 5962-88525 10 UX 5962-88525 10 XX ...

  • Page 14

    Lead, 0.600" Wide, Non-Windowed, Ceramic Dual Inline Package (Cerdip) 28F 28 Lead, Non-Windowed, Ceramic Bottom-Brazed Flat Package (Flatpack) 32J 32 Lead, Plastic J-Leaded Chip Carrier (PLCC) 32L 32 Pad, Non-Windowed, Ceramic Leadless Chip Carrier (LCC) 28P6 28 Lead, ...