Description
The AT27C400 is a low-power, high-performance 4,194,304-bit one-time programmable read only memory (OTP EPROM) organized as either 256K by 16 or 512K by 8 bits. It requires a single 5V power supply in normal read mode operation. Any word can be accessed in less than 70 ns, eliminating the need for speed-reducing WAIT states. The by-16 organization makes this part ideal for high-performance 16- and 32-bit microprocessor systems.

Features
• Fast Read Access Time - 70 ns
• Word-wide or Byte-wide Configurable
• 4 Megabit Flash and Mask ROM Compatible
• Low Power CMOS Operation
    – 100 µA Maximum Standby
    – 50 mA Maximum Active at 5 MHz
• Wide Selection of JEDEC Standard Packages
    – 40-Lead 600 mil PDIP
    – 40-Lead SOIC (SOP)
    – 48-Lead TSOP (12 mm x 20 mm)
• 5V ± 10% Power Supply
• High Reliability CMOS Technology
    – 2,000V ESD Protection
    – 200 mA Latchup Immunity
• Rapid™Programming Algorithm - 50 µs/word (typical)
• CMOS and TTL Compatible Inputs and Outputs
• Integrated Product Identification Code
• Commercial and Industrial Temperature Ranges