SN54AHCT123A

Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....0.5 V to 7 V
Input voltage range, VI (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to VCC + 0.5 V
Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....20 mA
Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±20 mA
Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..±25 mA
Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA
Package thermal impedance, JA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . 73°C/W
                                                                          DB package . . . . . . . . . . . . . . . . . . . . . . .82°C/W
                                                                          DGV package . . . . . . . . . . . . . . . . . . . . .120°C/W
                                                                          N package . . . . . . . . . . . . . . . . . . . . . . . ..67°C/W
                                                                          PW package . . . . . . . . . . . . . . . . . . . . . .108°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65°C to 150°C

These edge-triggered multivibrators SN54AHCT123A 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 of SN54AHCT123A 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 of SN54AHCT123A also can be reduced by taking CLR  low.