General Description
The HT27C020 chip family is a low-power, 2048K (2,097,152) bit, +5V electrically one-time programmable (OTP) read-only memories (EPROM). Organized into 256K words with 8 bits per word, it features a fast single address location programming, typically at 75µs per byte. Any byte can be accessed in less than 70ns/90ns/120ns with respect to Spec. This eliminates the need for WAIT states in highperformance microprocessor systems. The HT27C020 has separate Output Enable (OE) and Chip Enable (CE) controls which eliminate bus contention issues.

Features
• Operating voltage: +5.0V
• Programming voltage
    – VPP=12.5V±0.2V
    – VCC=6.0V±0.2V
• High-reliability CMOS technology
• Latch-up immunity to 100mA from -1.0V to VCC+1.0V
• CMOS and TTL compatible I/O
• Low power consumption
    – Active: 30mA max.
    – Standby: 1µA typ.
• 256K×8-bit organization
• Fast read access time: -70ns, -90ns and -120ns
• Fast programming algorithm
• Programming time 75µs typ.
• Two line controls (OE and CE)
• Standard product identification code
• Package type
    – 32-pin DIP/SOP
    – 32-pin PLCC
• Commercial temperature range (0°C to +70°C)