AT27C020_14 Datasheet, PDF (1/14 Pages) ATMEL Corporation – Low-power CMOS operation

Features
• Fast read access time – 55ns
• Low-power CMOS operation
– 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
2Mb (256K x 8)
One-time
Programmable,
Read-only Memory
Atmel AT27C020
1. Description
The Atmel^® AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time pro-
grammable, 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 micropro-
cessor 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 pro-
grammable (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 guar-
antees 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 pro-
gramming algorithms and voltages.
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