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 AT27C256R
• 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 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
• Industrial Temperature Range
• Green (Pb/Halide-free) Packaging Option