HT27C020

HT27C020 CMOS 256K´8-Bit OTP EPROM 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: 1mA typ. · 256K´8-bit organization · Fast read access time: 70ns · Fast programming algorithm · Programming time 75ms typ. · Two line controls (OE and CE) · Standard product identification code · Commercial temperature range (0°C to +70°C) · 32-pin DIP/SOP/PLCC package General Description The HT27C020 chip family is a low-power, 2048K (2,097,152) bits, +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 75ms per byte. Any byte can be accessed in less than 70ns with respect to Spec. This eliminates the need for WAIT states in high-performance microprocessor systems. The HT27C020 has separate Output Enable (OE) and Chip Enable (CE) controls which eliminate bus contention issues. Block Diagram R ow A d d re s s C o lu m n A d d re s s CE OE PG M X -D e c o d e r Y -D e c o d e r CE & OE & PG M & TEST C o n tr o l L o g ic C e ll A r r a y Y - G a tin g SA CKT & O u tp u t B u ffe r VCC VSS VPP D Q 0~D Q 7 Rev. 1.10 1 November 21, 2002 HT27C020 Pin Assignment VPP 1 A 16 2 A 15 3 A 12 4 A7 5 A6 6 A5 7 A4 8 A3 9 A 2 10 A 1 11 A 0 12 D Q 0 1...