28C64A 64K 150ns Parallel EEPROM

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The AT28C64 is a low-power, high-performance 8,192 words by 8-bit nonvolatile electrically erasable and programmable read-only memory with popular, easy-to-use features. The device is manufactured with Atmel’s reliable nonvolatile technology. The AT28C64 is accessed like a Static RAM for the read or write cycles without the need for external components.

During a byte write, the address and data are latched internally, freeing the microprocessor address and data bus for other operations. Following the initiation of a write cycle, the device will go to a busy state and automatically clear and write the latched data using an internal control timer

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28C64 Pinout

28C64 Pin Configuration

Pin No	Pin Name	Description
1	NC	Not Connect
2	A12	Address Pin 12
3	A7	Address Pin 7
4	A6	Address Pin 6
5	A5	Address Pin 5
6	A4	Address Pin 4
7	A3	Address Pin 3
8	A2	Address Pin 2
9	A1	Address Pin 1
10	A0	Address Pin 0
11	I/O 0	Data Inputs/Outputs 0
12	I/O 1	Data Inputs/Outputs 1
13	I/O 2	Data Inputs/Outputs 2
14	GND	Ground Pin
15	I/O 3	Data Inputs/Outputs 3
16	I/O 4	Data Inputs/Outputs 4
17	I/O 5	Data Inputs/Outputs 5
18	I/O 6	Data Inputs/Outputs 6
19	I/O 7	Data Inputs/Outputs 7
20	CE’	Chip Enable Pin
21	A10	Address Pin 10
22	OE’	Output Enable
23	A11	Address Pin 11
24	A9	Address Pin 9
25	A8	Address Pin 8
26	NC	No Connection
27	WE’	Write Enable Pin
28	VCC	Supply Voltage Pin

28C64 Key Feature

5V ± 10% Supply
CMOS and TTL Compatible Inputs and Outputs
JEDEC Approved Byte-wide Pinout
Commercial and Industrial Temperature Ranges
Fast Read Access Time – 120 ns
Fast Byte Write – 200 µs or 1 ms
Self-timed Byte Write Cycle
- Internal Address and Data Latches
- Internal Control Timer
- Automatic Clear Before Write