The Microchip AT27C256R is a low-power, high-performance 256-Kbit One Time Programmable EPROM organized as 32-Kbit x 8. Requiring a single 5V power supply, in normal read mode operation typical power consumption is only 8 mA in active mode and less than 10 μA in standby mode. Any byte can be accessed in less than 45 ns, eliminating the need for speed reducing WAIT states on high-performance microprocessor systems.

• 256-Kbit (32-Kbit x 8)

• Low-power CMOS operation

• Standard power supply range, 5V +/-10%
• 100 μA max standby
•  20mA max active at 5 MHz
• Parallel Interface
• 45 ns access time
• 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 Temperature Range: -40°C to 85°C
• Available in Green (Pb/Halide-free) Packaging Only
• 32-lead, Plastic J-leaded Chip Carrier (PLCC)

28-lead, 0.600" wide, plastic, dual inline package (PDIP)