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74LV123_15

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74LV123_15 数据手册

74LV123

Dual retriggerable monostable multivibrator with reset

Rev. 7 — 12 December 2011

Product data sheet

1. General description

The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible

with the 74HC123; 74HCT123. It is a dual retriggerable monostable multivibrator which

uses three methods to control the output pulse width:

1. The basic pulse time is programmed by the selection of an external resistor (R_EXT

)

and capacitor (C_EXT). These are normally connected as shown in Figure 9.

2. Once triggered, the basic output pulse width may be extended by retriggering the

gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By

repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made

as long as desired (see Figure 12).

3. Alternatively, an output delay can be terminated at any time by a LOW-going edge on

input nRD, which also inhibits the triggering (see Figure 13).

Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower

input rise and fall times.

2. Features and benefits

 Optimized for low-voltage applications: 1.0 V to 5.5 V

 Accepts TTL input levels between V_CC= 2.7 V and V_CC= 3.6 V

 Typical output ground bounce: < 0.8 V at V_CC= 3.3 V and T_amb= 25 C

 Typical HIGH-level output voltage (V_OH) undershoot: > 2 V at V_CC= 3.3 V and

T_amb= 25 C

 DC triggered from active HIGH or active LOW inputs

 Retriggerable for very long pulses up to 100 % duty factor

 Direct reset terminates output pulses

 Schmitt-trigger action on all inputs except for the reset input

12 3 4 5 6 7...24

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型号	品牌	获取价格	描述	数据表
74LV123A	TI	获取价格	DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS
74LV123BQ	NXP	获取价格	Dual retriggerable monostable multivibrator with reset
74LV123BQ	NEXPERIA	获取价格	Dual retriggerable monostable multivibrator with resetProduction
74LV123D	NXP	获取价格	Dual retriggerable monostable multivibrator with reset
74LV123D	NEXPERIA	获取价格	Dual retriggerable monostable multivibrator with resetProduction
74LV123D-118	NXP	获取价格	Dual retriggerable monostable multivibrator w
74LV123DB	NXP	获取价格	Dual retriggerable monostable multivibrator with reset
74LV123DB,112	NXP	获取价格	74LV123 - Dual retriggerable monostable multivibrator with reset SSOP1 16-Pin
74LV123DB,118	NXP	获取价格	74LV123 - Dual retriggerable monostable multivibrator with reset SSOP1 16-Pin
74LV123DB-T	NXP	获取价格	IC LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16, 5.30 MM, PLASTIC, MO-150,