HD74LV123A Datasheet | Hitachi Semiconductor

Description The HD74LV123A features 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 basic 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. Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or high-level-active (B) input. Pulse duration can be reduced by taking CLR low. Features - - - - VCC = 2.0 V to 5.5 V operation All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V) All outputs VO (Max.) = 5.5 V (@VCC = 0 V) Output current ±6 m A (@VCC = 3.0 V to 3.6 V), ±12 m A (@VCC = 4.5 V to 5.5 V) Function Table Inputs CLR L H H H H ↑ Note: H: L: X: ↑: ↓: A X H X L ↓ L High level Low level Immaterial Low to high transition High to low transition : High level pulse : Low level pulse B X X L ↑ H H Outputs Q L L L Q H H H Pin Arrangement 1A 1 1B 1CLR 2 3 16 VCC 15 1Rext / Cext 14 1Cext 13 1Q 12 2Q 11 2CLR 10 2B 9 2A 1Q 4 2Q 2Cext 2Rext / Cext 5 6 7 GND 8 (Top view) Absolute Maximum Ratings Item Supply voltage range Input voltage range- 1 1, 2 Symbol VCC VI VO Ratings - 0.5 to 7.0 - 0.5 to 7.0 - 0.5 to VCC + 0.5 - 0.5 to 7.0 Unit V V V Conditions Output voltage range- Output: H or L VCC: OFF Input clamp current Output clamp current Continuous output current Continuous current through VCC or GND Maximum power dissipation at Ta = 25°C (in still air)- 3 I IK I OK IO I CC or IGND PT - 20 ±50 ±25 ±50 785 500 m A m A m A m A m W VI < 0 VO < 0 or VO > VCC VO = 0 to VCC SOP...