27C256 256K 120ns CMOS EPROM

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The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45 ns, eliminating the need for speed-reducing WAIT states on high-performance microprocessor systems. Atmel’s scaled CMOS technology provides low-active power consumption and fast programming. Power consumption is typically only 8 mA in Active Mode and less than 10 µA in Standby.

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27C256 Pinout

27C256 Pin Configuration

Pin Number	Pin No	Description
1	VPP	Programming Supply
2	A12	Address Input
3	A7	Address Input
4	A6	Address Input
5	A5	Address Input
6	A4	Address Input
7	A3	Address Input
8	A2	Address Input
9	A1	Address Input
10	A0	Address Input
11	O0	Data Output
12	O1	Data Output
13	O2	Data Output
14	GND	Ground
15	O3	Data Output
16	O4	Data Output
17	O5	Data Output
18	O6	Data Output
19	O7	Data Output
20	CE’	Chip Enable
21	A10	Address Input
22	OE’	Output Enable/Program Supply
23	A11	Address Input
24	A9	Address Input
25	A8	Address Input
26	A13	Address Input
27	A14	Address Input
28	VCC	Positive Power Supply

27C256 Key Features

High Reliability CMOS Technology
- 2,000V ESD Protection
- 200 mA Latchup Immunity
Rapid Programming Algorithm – 100 µs/byte (typical)
CMOS and TTL Compatible Inputs and Outputs
Integrated Product Identification Code
Commercial, Industrial and Automotive Temperature Ranges
JEDEC Standard Packages
- 28-Lead 600-mil PDIP
- 32-Lead PLCC
- 28-Lead TSOP and SOIC