SN74LV123A

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input voltage range, V_I (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to 7 V
Output voltage range in high or low state, V_O (see Notes 1 and 2) . . . . . . . . .......0.5 V to VCC + 0.5 V
Output voltage range in power-off state, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to 7 V
Input clamp current, I_IK (V_I < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..20 mA
Output clamp current, I_OK (V_O < 0 or V_O > V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50 mA
Continuous output current, I_O (V_O = 0 to V_CC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 mA
Continuous current through V_CC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±50 mA
Package thermal impedance, q_JA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113°C/W
                                                                          DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131°C/W
                                                                          DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180°C/W
                                                                          NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .111°C/W
                                                                          PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149°C/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C

The 'LV123A devices are dual retriggerable monostable multivibrators designed for 2-V to 5.5-V V_CC operation.

These edge-triggered multivibrators LV123A 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, theA input is low, the B input is high, and the clear (CLR) input goes high.

The LV123A output pulse duration is programmable 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 R_ext/C_ext and VCC. To obtain variable pulse durations, connect an external variable resistance between R_ext/C_ext and VCC. The output pulse duration can also be reduced by taking CLRlow.

LV123A Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition rates with jitter-free triggering at the outputs.