SN74LV123A-Q1 - 汽车类双路可重触发单稳多频振荡器

SN74LV123A-Q1是TI德州仪器公司的一款单稳多频振荡器产品，SN74LV123A-Q1是汽车类双路可重触发单稳多频振荡器，本站介绍了SN74LV123A-Q1的封装应用图解、特点和优点、功能等，并给出了与SN74LV123A-Q1相关的TI元器件型号供参考。

SN74LV123A-Q1 - 汽车类双路可重触发单稳多频振荡器 - 单稳多频振荡器 - 特殊逻辑 - 德州仪器

产品描述

The SN74LV123A is a dual retriggerable monostable multivibrator designed for 2-V to 5.5-V VCC operation.

This edge-triggered multivibrator 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.

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.

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. The input/output timing diagram illustrates pulse control by retriggering the inputs and early clearing.

During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free, without applying a reset pulse.

This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.

产品特性

Qualified for Automotive Applications
Typical VOLP (Output Ground Bounce) <0.8 V at VCC = 3.3 V, TA = 25°C
Typical VOHV (Output VOH Undershoot) >2.3 V at VCC = 3.3 V, TA = 25°C
Supports 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
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

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