• 256-Kbit (32-Kbit x 8)
• Dual voltage range operation
• Unregulated battery power supply range, 2.7V to 3.6V, or
• Standard power supply range, 5V +/-10%
• Parallel Interface
• 70 ns access time
• Pin compatible with Microchip AT27C256R
• Low-power CMOS operation
• 20 µA max standby (less than 1 µA, typical) for VCC = 3.6V
• 29 mW max active at 5 MHz for VCC = 3.6V
• 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
• JEDEC standard for LVTTL and LVBO
• 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)

The Microchip AT27BV256 is a high-performance, low-power, Battery-Voltage 256-kbit One Time Programmable EPROM organized as 32-Kbit x 8. Requiring a single power supply in the range of 2.7V to 3.6V; any byte can be accessed in less than 70 ns. With typical power consumption of only 18 mW at 5 MHz and VCC = 3V, the AT27BV256 consumes less than one-fifth the power of a standard, 5V EPROM, making it ideal for fast, portable systems using either regulated or unregulated battery power.