SN74AHCT123A Datasheet | Texas Instruments

ption/ordering information These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A input is low, and the B input goes high. In the second method, the B input is high, and the A input goes low. In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high. The output pulse duration is programmed by selecting external resistance and capacitance values. The external timing capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected between Rext/Cext and VCC. To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and VCC. The output pulse duration also can be reduced by taking CLR low. SCLS420G - JUNE 1998 - REVISED APRIL 2003 SN54AHCT123A . . . J OR W PACKAGE SN74AHCT123A . . . D, DB, DGV, N, OR PW PACKAGE (TOP VIEW) 1A 1B 1CLR 1Q 2Q 2Cext 2Rext/Cext GND 1 2 3 4 5 6 7 8 16 VCC 15 1Rext/Cext 14 1Cext 13 1Q 12 2Q 11 2CLR 10 2B 9 2A SN54AHCT123A . . . FK PACKAGE (TOP VIEW) 1B 1A NC VCC 1R ext /C ext 1CLR 1Q NC 2Q 2Cext 3 2 1 20 19 4 18 5 17 6 16 7 15 8 14 9 10 11 12 13 1Cext 1Q NC 2Q 2CLR 2Rext /Cext GND NC 2A 2B - No internal connection ORDERING INFORMATION PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING PDIP -...