DESCRIPTION
All inputs are equipped with protection circuits against static discharge and transient excess voltage. PIN CONNECTION 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 Diode Current DC Output Diode Current DC Output Current Power Dissipation Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 ± 20 ± 20 ± 25 ± 50 500(*) -65 to +150 300 Unit V V V mA mA mA mA mW °C °C ICC or IGND DC VCC or Ground Current ABSOLUTE MAXIMUM RATINGS
are those values beyond which damage to the device may occur.
STMicroelectronics
