AT27BV256
256K (32K x 8)
Unregulated
Battery-Voltage

High Speed
OTP
CMOS EPROM
Features
•
Fast Read Access Time - 70 ns
•
Dual Voltage Range Operation
Unregulated Battery Power Supply Range, 2.7V to 3.6V
or Standard 5V ± 10% Supply Range
•
Pin Compatible with JEDEC Standard AT27C256
•
Low Power CMOS Operation
20 µA max. (less than 1 µA typical) Standby for V
CC
= 3.6V
29 mW max. Active at 5 MHz for V
CC
= 3.6V
•
JEDEC Standard Surface Mount Packages
32-Lead PLCC
28-Lead 330-mil SOIC
28-Lead TSOP
•
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
JEDEC Standard for LVTTL and LVBO
•
Integrated Product Identification Code
•
Commercial and Industrial Temperature Ranges
Description
The AT27BV256 is a high performance, low power, low voltage 262,144 bit one-time
programmable read only memory (OTP EPROM) organized as 32K by 8 bits. It re-
quires only one supply in the range of 2.7V to 3.6V in normal read mode operation,
making it ideal for fast, portable systems using either regulated or unregulated battery
power.
Atmel’s innovative design techniques provide fast speeds that rival 5V parts while
keeping the low power consumption of a 3V supply. At V
CC
= 2.7V, any word can be
accessed in less than 70 ns. With a typical power dissipation of only 18 mW at 5 MHz
and V
CC
= 3V, the AT27BV256 consumes less than one fifth the power of a standard
5V EPROM.
(continued)
Pin Configurations
Pin Name Function
A0 - A14 Addresses
O0 - O7 Outputs
CE Chip Enable
OE Output Enable
NC No Connect
0601A
SOIC Top View
Note: PLCC Package Pins 1
and 17 are DON’T CONNECT.
PLCC Top View
TSOP Top View
Type 1
AT27BV256
3-3