IN74HC221A - IK Semiconductor

IN74HC221A Dual Monostable Binary Up/Down Counter

TECHNICAL DATA IN74HC221A Dual Monostable Multivibrator The IN74HC221A is identical in pinout to the LS/ALS221. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/fa.

Features

ORMATION IN74HC221AN Plastic IN74HC221AD SOIC TA = -55° to 125° C for all packages PIN ASSIGNMENT LOGIC DIAGRAM 1A 1B 1RESET DEXT CEXT REXT CEXT DEXT REXT 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V CC 1REXT/CEXT 1CEXT 1Q 2Q 2RESET 2B 2A 1Q 2Q 2CEXT 2REXT/CEXT GND FUNCTION TABLE PIN 16 =VCC PIN 8 = GND Note (1) CEXT, REXT, DEXT are external components. (2) DEXT is a clamping diode. The external capacitor is charged to VCC in the stand-by state, i.e. no trigger. When the supply voltage is turned off CX is discharged mainly through an internal parasitic diode. If CX is sufficiently large and .