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  ON Semiconductor Electronic Components Datasheet  

CAT28C257 Datasheet

256 kb CMOS Parallel EEPROM

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CAT28C257
256 kb CMOS Parallel
EEPROM
Description
The CAT28C257 is a fast, low power, 5 Vonly CMOS Parallel
EEPROM organized as 32K x 8bits. It requires a simple interface for
insystem programming. Onchip address and data latches,
selftimed write cycle with autoclear and VCC power up/down write
protection eliminate additional timing and protection hardware. DATA
Polling and Toggle status bits signal the start and end of the selftimed
write cycle. Additionally, the CAT28C257 features hardware and
software write protection.
The CAT28C257 is manufactured using ON Semiconductor’s
advanced CMOS floating gate technology. It is designed to endure
100,000 program/erase cycles and has a data retention of 100 years.
The device is available in JEDEC approved 28pin DIP or 32pin
PLCC packages.
Features
Fast Read Access Times: 120/150 ns
Low Power CMOS Dissipation:
– Active: 25 mA Max.
– Standby: 150 mA Max.
Simple Write Operation:
– Onchip Address and Data Latches
– Selftimed Write Cycle with Autoclear
Fast Write Cycle Time:
5 ms Max.
CMOS and TTL Compatible I/O
Automatic Page Write Operation:
1 to 128 Bytes in 5 ms
Page Load Timer
End of Write Detection:
Toggle Bit
DATA Polling
Hardware and Software Write Protection
100,000 Program/Erase Cycles
100 Year Data Retention
Commercial, Industrial and Automotive Temperature Ranges
http://onsemi.com
PDIP28
P, L SUFFIX
CASE 646AE
PLCC32
N, G SUFFIX
CASE 776AK
Pin Name
A0A14
I/O0I/O7
CE
OE
WE
VCC
VSS
NC
PIN FUNCTION
Function
Address Inputs
Data Inputs/Outputs
Chip Enable
Output Enable
Write Enable
5 V Supply
Ground
No Connect
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
© Semiconductor Components Industries, LLC, 2009
December, 2009 Rev. 6
1
Publication Order Number:
CAT28C257/D


  ON Semiconductor Electronic Components Datasheet  

CAT28C257 Datasheet

256 kb CMOS Parallel EEPROM

No Preview Available !

A7A14
VCC
CE
OE
WE
A0A6
CAT28C257
PIN CONFIGURATION
DIP Package (P, L)
PLCC Package (N, G)
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
I/O1
I/O2
12 17
13 16
VSS 14 15
VCC
WE
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
4 3 2 1 32 31 30
A6
A5
A4
AA32
AA10
NC
5
6
7
8
9
10
11
12
29
28
27
26
25
24
23
22
I/O0
13 21
14 1516 171819 20
AA89
A11
NC
OE
A10
CE
I/O7
I/O6
(Top Views)
ADDR. BUFFER
& LATCHES
INADVERTENT
WRITE
PROTECTION
CONTROL
LOGIC
TIMER
ADDR. BUFFER
& LATCHES
ROW
DECODER
HIGH VOLTAGE
GENERATOR
DATA POLLING
AND
TOGGLE BIT
COLUMN
DECODER
Figure 1. Block Diagram
32,768 x 8
EEPROM
ARRAY
128 BYTE PAGE
REGISTER
I/O BUFFERS
I/O0I/O7
http://onsemi.com
2


Part Number CAT28C257
Description 256 kb CMOS Parallel EEPROM
Maker ON Semiconductor
Total Page 13 Pages
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