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 requires 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 VCC = 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 VCC = 3V, the AT27BV256 consumes less than one fifth the power of a standard 5V 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 VCC = 3.6V
   29 mW max. Active at 5 MHz for VCC = 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