器件名称: 74LV123PWDH
功能描述: Dual retriggerable monostable multivibrator with reset
文件大小: 145.54KB 共16页
简 介:INTEGRATED CIRCUITS
74LV123 Dual retriggerable monostable multivibrator with reset
Product specification Supersedes data of 1997 Feb 04 IC24 Data Handbook 1998 Apr 20
Philips Semiconductors
Philips Semiconductors
Product specification
Dual retriggerable monostable multivibrator with reset
74LV123
FEATURES
Optimized for Low Voltage applications: 1.0 to 5.5V Accepts TTL input levels between VCC = 2.7V and VCC = 3.6V Typical VOLP (output ground bounce) t 0.8V @ VCC = 3.3V, Typical VOHV (output VOH undershoot) u 2V @ VCC = 3.3V, 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 Output capability: standard (except for nREXT/CEXT) ICC category: MSI
Tamb = 25°C Tamb = 25°C
DESCRIPTION
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT123. The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). They are normally connected as shown in Figure 1. 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 desire……
