28C64 64K 250ns Parallel PLCC 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 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	DC	Don’t Connect
2	BUSY’	Busy Pin
3	A12	Address Pin 12
4	A7	Address Pin 7
5	A6	Address Pin 6
6	A5	Address Pin 5
7	A4	Address Pin 4
8	A3	Address Pin 3
9	A2	Address Pin 2
10	A1	Address Pin 1
11	A0	Address Pin 0
12	NC	No Connection
13	I/O 0	Data Inputs/Outputs 0
14	I/O 1	Data Inputs/Outputs 1
15	I/O 2	Data Inputs/Outputs 2
16	Vss	Ground Pin
17	DC	Don’t Connect
18	I/O 3	Data Inputs/Outputs 3
19	I/O 4	Data Inputs/Outputs 4
20	I/O 5	Data Inputs/Outputs 5
21	I/O 6	Data Inputs/Outputs 6
22	I/O 7	Data Inputs/Outputs 7
23	CE’	Chip Enable Pin
24	A10	Address Pin 10
25	OE’	Output Enable
26	NC	No Connection
27	A11	Address Pin 11
28	A9	Address Pin 9
29	A8	Address Pin 8
30	NC	No Connection
31	WE’	Write Enable
32	VCC	Power Supply

28C64 Key Feature

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
Direct Microprocessor Control
- READY/BUSY Open-Drain Output
- DATA Polling
Low Power
- 30 mA Active Current
- 100 µA CMOS Standby Current
High Reliability
- Endurance: 10^4 or 10^5 Cycles
- Data Retention: 10 Years
5V ± 10% Supply
CMOS and TTL Compatible Inputs and Outputs
JEDEC Approved Byte-wide Pinout
Commercial and Industrial Temperature Ranges