27256 NMOS 256K 32K x 8 UV EPROM

27256 NMOS 256K 32K x 8 UV EPROM

The M74HC51 is an high speed CMOS DUAL 2 WIDE 2 INPUT AND/OR INVERT GATE fabricated with silicon gate C2MOS technology. It contains a 2-WIDE 2-INPUT AND/OR INVERT GATE and a 2-WIDE 3-INPUT AND/OR INVERT GATE. The internal circuit is composed of 3 stages (2 INPUT) or 5 stages (3 INPUT) including buf.

Features

ONNECTION AND IEC LOGIC SYMBOLS August 2001 1/9 M74HC51 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1, 12, 13, 9, 10, 11 2, 3, 4, 5 8, 6 7 14 SYMBOL 1A to 1F 2A to 2D 1Y to 2Y GND VCC NAME AND FUNCTION Data Inputs Data Inputs Data Outputs Ground (0V) Positive Supply Voltage TRUTH TABLE 1A H X 1B 1C 1D 1E 1F X H 1Y L L H H H X X X X H H ALL OTHER COMBINATIONS TRUTH TABLE 2A H X 2B 2C 2D 2Y L L H H X X X H H ALL OTHER COMBINATIONS X : Don’t Care ABSOLUTE MAXIMUM RATINGS Symbol V CC VI VO IIK IOK IO PD Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diod.