Features
• Fast Read Access Time – 45 ns
• Low-Power CMOS Operation
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– 100 µA Max Standby
– 20 mA Max Active at 5 MHz
JEDEC Standard Packages
– 28-lead PDIP
– 32-lead PLCC
– 28-lead TSOP and SOIC
5V ± 10% Supply
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
Integrated Product Identification Code
Industrial and Automotive Temperature Ranges
Green (Pb/Halide-free) Packaging Option
256K (32K x 8)
OTP EPROM
AT27C256R
1. Description
The AT27C256R is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized 32K by 8 bits. It requires only one 5V
power supply in normal read mode operation. Any byte can be accessed in less than
45 ns, eliminating the need for speed reducing WAIT states on high-performance
microprocessor systems.
Atmel’s scaled CMOS technology provides low-active power consumption, and fast
programming. Power consumption is typically only 8 mA in Active Mode and less than
10 µA in Standby.
The AT27C256R is available in a choice of industry-standard JEDEC-approved one
time programmable (OTP) plastic DIP, PLCC, SOIC, and TSOP packages. All devices
feature two-line control (CE, OE) to give designers the flexibility to prevent bus
contention.
With 32K byte storage capability, the AT27C256R allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.
Atmel’s AT27C256R has additional features to ensure high quality and efficient production 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.
0014M–EPROM–12/07
