Features
• Fast Read Access Time – 55 ns
• Dual Voltage Range Operation
– Low-voltage Power Supply Range, 3.0V 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 V
CC
= 3.6V
– 29 mW Max Active at 5 MHz for V
CC
= 3.6V
• JEDEC Standard 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
• Integrated Product Identification Code
• Industrial Temperature Range
• Green (Pb/Halide-free) Packaging Option
1. Description
The AT27LV256A 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 3.0V to 3.6V in normal read mode operation,
making it ideal for fast, portable systems using battery power.
Atmel’s innovative design techniques provide fast speeds that rival 5V parts while
keeping the low power consumption of a 3.3V supply. At V
CC
= 3.0V, any byte can be
accessed in less than 55 ns. With a typical power dissipation of only 18 mW at 5 MHz
and V
CC
= 3.3V, the AT27LV256A consumes less than one fifth the power of a stan-
dard 5V EPROM. Standby mode supply current is typically less than 1 µA at 3.3V.
The AT27LV256A is available in industry-standard JEDEC-approved one-time
programmable (OTP) plastic PLCC, SOIC and TSOP packages. All devices feature
two-line control (CE
, OE) to give designers the flexibility to prevent bus contention.
The AT27LV256A 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. The device is
also capable of standard 5-volt operation making it ideally suited for dual supply range
systems or card products that are pluggable in both 3-volt and 5-volt hosts.
Atmel’s AT27LV256A has additional features to ensure high quality and efficient pro-
duction use. The Rapid Programming Algorithm reduces the time required to program
the part and guarantees reliable programming. Programming time is typically only
100 µs/byte. The Integrated Product Identification Code electronically identifies the
device and manufacturer. This feature is used by industry-standard programming
equipment to select the proper programming algorithms and voltages. The
AT27LV256A programs exactly the same way as a standard 5V AT27C256R and
uses the same programming equipment.
256K (32K x 8)
Low-voltage
OTP EPROM
AT27LV256A
0547G–EPROM–12/07
