Features
• Fast Read Access Time – 150 ns
• Automatic Page Write Operation
– Internal Address and Data Latches for 64 Bytes
• Fast Write Cycle Times
– Page Write Cycle Time: 10 ms Maximum
– 1 to 64-byte Page Write Operation
• Low Power Dissipation
– 40 mA Active Current
– 100 µA CMOS Standby Current
• Hardware and Software Data Protection
• DATA Polling and Toggle Bit for End of Write Detection
• High Reliability CMOS Technology
– Endurance: 100,000 Cycles
64K (8K x 8)
Parallel
– Data Retention: 10 Years
EEPROM with
Page Write and
Software Data
Protection
• Single 5V 10% Supply
• CMOS and TTL Compatible Inputs and Outputs
• JEDEC Approved Byte-wide Pinout
• Commercial and Industrial Temperature Ranges
Description
The AT28C64B is a high-performance electrically-erasable and programmable read
only memory (EEPROM). Its 64K of memory is organized as 8,192 words by 8 bits.
Manufactured with Atmel’s advanced nonvolatile CMOS technology, the device offers
access times to 150 ns with power dissipation of just 220 mW. When the device is
AT28C64B
deselected, the CMOS standby current is less than 100 µA.
(continued)
Pin Configurations
PDIP, SOIC
Top View
Pin Name
A0 - A12
CE
Function
NC
A12
A7
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
WE
NC
Addresses
2
Chip Enable
Output Enable
Write Enable
Data Inputs/Outputs
No Connect
3
A6
4
A8
OE
A5
5
A9
A4
6
A11
OE
WE
A3
7
A2
8
A10
CE
I/O0 - I/O7
NC
A1
9
A0
10
11
12
13
14
I/O7
I/O6
I/O5
I/O4
I/O3
I/O0
I/O1
I/O2
GND
DC
Don’t Connect
PLCC
Top View
TSOP
Top View
OE
A11
A9
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A10
CE
A6
A5
A4
A3
A2
5
6
7
8
9
29 A8
28 A9
27 A11
26 NC
25 OE
24 A10
23 CE
22 I/O7
21 I/O6
2
3
I/O7
I/O6
I/O5
I/O4
I/O3
GND
I/O2
I/O1
I/O0
A0
A8
4
NC
WE
VCC
NC
A12
A7
5
6
A1 10
A0 11
7
8
NC 12
I/O0 13
9
10
11
12
13
14
A6
A5
A4
A1
Rev. 0270H–12/99
A3
A2
Note:
PLCC package pins 1 and 17 are
DON’T CONNECT.
1