Features
• Fast read access time – 55ns
• Low-power CMOS operation
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– 100µA max standby
– 25mA max active at 5MHz
JEDEC standard packages
– 32-lead PDIP
– 32-lead PLCC
5V 10% supply
High-reliability CMOS technology
– 2,000V ESD protection
– 200mA latchup immunity
Rapid programming algorithm – 100µs/byte (typical)
CMOS- and TTL-compatible inputs and outputs
Integrated product identification code
Industrial and automotive temperature ranges
Green (Pb/halide-free) packaging option
1.
2Mb (256K x 8)
One-time
Programmable,
Read-only Memory
Atmel AT27C020
Description
The Atmel® AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time programmable, read-only memory (OTP EPROM) organized as 256K by 8 bits. It requires only
one 5V power supply in normal read mode operation. Any byte can be accessed in less than
55ns, eliminating the need for speed-reducing WAIT states on high-performance microprocessor systems.
In read mode, the AT27C020 typically consumes 8mA. Standby mode supply current is
typically less than 10µA.
The AT27C020 is available in a choice of industry-standard, JEDEC approved, one-time programmable (OTP) PDIP and PLCC packages. All devices feature two-line control (CE, OE)
to give designers the flexibility to prevent bus contention.
With 256K byte storage capability, the AT27C020 allows firmware to be stored reliably and
to be accessed by the system without the delays of mass storage media.
The AT27C020 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 100µs/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.
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