Description
The Atmel® AT27C256R is a low-power, high-performance, 262,144-bit, one-time programmable, read-only memory (OTP EPROM) organized as 32K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 45ns, eliminating the need for speed reducing WAIT states on high-performance microprocessor systems.

FEATUREs
• Fast read access time – 45ns
• Low-power CMOS operation
   – 100µA max standby
   – 20mA max active at 5MHz
• JEDEC standard packages
   – 28-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