SN74LS423N集成电路（IC）的多谐振荡器规格书PDF中文资料

SN74LS423N属于集成电路（IC）的多谐振荡器。由德州仪器制造生产的SN74LS423N多谐振荡器多谐振荡器是简单的双态器件，尽管它们的典型使用方式在很大程度上具有模拟特性，但通常被认为是数字逻辑元器件。单稳型也称为“单发”，具有一种稳定状态；但施加触发信号可使它们离开此状态一段时间，该时间通常由所连接电容器的值来确定。这些器件对于去弹跳开关触头等应用非常有用。非稳型没有稳定状态，在两个状态之间按一定频率持续转换，该频率通常也是由所连接电容器的值来确定。

Will Not Trigger from Clear

D.C Triggered from Actve-High or Active-

Low Gated Logic Inputs

Retriggerable for Very Long Output Pulses,

Up to 100% Duty Cycle

Overriding Clear Teminates Output Pulse

‘L§422 Has Internal Timing Resistor

description

The 'LS422 and ‘S423 are identical to ‘LS122 and

'LS123 except they cannot be triggered via clear.

These d-c triggered mulrivibrators feature output-pulse-

width control by three methods. The basic pulse time is

programmed by selection of external resistance and

capacitance values (see typical application datal. The

‘LS422 contains an internal timing resistor that allows

the circuits to be used with only an external capacitor, if

so desired. Once triggerad, the basic pulse width may be

extended by retriggering the gated low-level-active (Al

or high-level-active (B) inputs, or be reduced by use of

the overriding clear. Figure 1 illustrates pulse control by

retriggering and early clear.

The 'LS422 and LS423 have enough Schmitt hysteresis

to ensure jitter-free triggering from the B input with tran-

sition rates as slow as 0.1 millivolt per nanosecond. The

LS422 Ripe is nominally 10 k ohms.

The SN54LS422 and SN54LS423 are characterized for

operation over the full military temperature range of

—55°C to 125°C. The SN74LS422 and SN74L5423

are characterized for operation from 0°C to 70°C.