SN74LV123AD .

产品概述

The SN74LV123AD is a dual retriggerable Monostable Multivibrator designed for 2 to 5.5V VCC operation. It 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 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 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.

• Support mixed-mode voltage operation on all ports
• Schmitt-trigger circuitry on A, B and CLR inputs for slow input transition rates
• Edge triggered from active-high or active-low gated logic inputs
• Ioff Supports partial-power-down mode operation
• Retriggerable for very long output pulses, up to 100% duty cycle
• Overriding clear terminates output pulse
• Glitch-free power-up reset on outputs
• Latch-up performance exceeds 100mA per JESD 78, Class II
• Green product and no Sb/Br

应用

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