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.
The Atmel scaled CMOS technology provides low active power
consumption and fast programming. Power consumption is typically
only 8mA in active mode and less than 10µA in standby mode.
The AT27C256R 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 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.
The 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 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.
Features
• Fast Read Access Time – 45 ns
• Low-Power CMOS Operation
– 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
