AT27BV256_14 Datasheet, PDF (1/12 Pages) ATMEL Corporation – Dual voltage range operation

Features
• Fast read access time – 70ns
• Dual voltage range operation
– Unregulated battery power supply range, 2.7V to 3.6V, or
– Standard power supply range, 5V  10%
• Pin compatible with JEDEC standard Atmel^® AT27C256R
• Low-power CMOS operation
– 20µA max standby (less than 1µA, typical) for V_CC = 3.6V
– 29mW max active at 5MHz for V_CC = 3.6V
• JEDEC standard surface mount package
– 32-lead PLCC
• High-reliability CMOS technology
– 2,000V ESD protection
– 200mA latchup immunity
• Rapid programming algorithm – 100µs/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
256K (32K x 8)
Unregulated Battery
Voltage, High-
speed, One-time
Programmable,
Read-only Memory
Atmel AT27BV256
1. Description
The Atmel 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, mak-
ing it ideal for fast, portable systems using either regulated or unregulated battery power.
The Atmel innovative design techniques provide fast speeds that rival 5V parts, while keep-
ing the low power consumption of a 3V supply. At V_CC = 2.7V, any word can be accessed in
less than 70ns. With a typical power dissipation of only 18mW at 5 MHz and V_CC = 3V, the
AT27BV256 consumes less than one-fifth the power of a standard, 5V EPROM.
Standby mode supply current is typically less than 1µA at 3V. The AT27BV256 simplifies
system design and stretches battery lifetime even further by eliminating the need for power
supply regulation.
The AT27BV256 is available in an industry-standard, JEDEC-approved ,one-time program-
mable (OTP) PLCC package. All devices feature two-line control (CE, OE) to give
designers the flexibility to prevent bus contention.
The AT27BV256 operating with V_CC at 3.0V produces TTL-level outputs that are compatible
with standard TTL logic devices operating at V_CC = 5.0V. At V_CC = 2.7V, the part is compati-
ble with JEDEC-approved, low-voltage battery operation (LVBO) interface specifications.
The device is also capable of standard, 5V operation, making it ideally suited for dual supply
range systems or card products that are pluggable in both 3V and 5V hosts.
The AT27BV256 has additional features to ensure high quality and efficient production use.
The rapid programming algorithm reduces the time required to program the part and guar-
antees reliable programming. Programming time is typically only 100µs/byte. The
integrated product identification code electronically identifies the device and manufacturer.
0601F–EPROM–4/11