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74LVC1G123DC PDF预览

74LVC1G123DC

更新时间: 2024-11-21 00:56:51
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
31页 1230K
描述
Single retriggerable monostable multivibrator

74LVC1G123DC 数据手册

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74LVC1G123  
Single retriggerable monostable multivibrator; Schmitt trigger  
inputs  
Rev. 4 — 27 November 2013  
Product data sheet  
1. General description  
The 74LVC1G123 is a single retriggerable monostable multivibrator with Schmitt trigger  
inputs. Output pulse width is controlled by three methods:  
1. The basic pulse is programmed by selection of an external resistor (REXT) and  
capacitor (CEXT).  
2. Once triggered, the basic output pulse width may be extended by retriggering the  
gated active LOW-going edge input (A) or the active HIGH-going edge input (B). By  
repeating this process, the output pulse period (Q = HIGH) can be made as long as  
desired. Alternatively an output delay can be terminated at any time by a LOW-going  
edge on input CLR, which also inhibits the triggering.  
3. An internal connection from CLR to the input gates makes it possible to trigger the  
circuit by a HIGH-going signal at input CLR.  
Inputs can be driven from either 3.3 V or 5 V devices. This feature allows the use of these  
devices as translators in a mixed 3.3 V and 5 V environment. Schmitt trigger inputs,  
makes the circuit highly tolerant to slower input rise and fall times.  
This device is fully specified for partial power-down applications using IOFF. The IOFF  
circuitry disables the output, preventing the damaging backflow current through the device  
when it is powered down.  
2. Features and benefits  
Wide supply voltage range from 1.65 V to 5.5 V  
High noise immunity  
24 mA output drive (VCC = 3.0 V)  
CMOS low power consumption  
DC triggered from active HIGH or active LOW inputs  
Retriggerable for very long pulses up to 100 % duty factor  
Direct reset terminates output pulse  
Schmitt trigger on all inputs  
Complies with JEDEC standard:  
JESD8-7 (1.65 V to 1.95 V)  
JESD8-5 (2.3 V to 2.7 V)  
JESD8-B/JESD36 (2.7 V to 3.6 V)  
Power-on-reset on outputs  
Latch-up performance exceeds 100 mA  
Direct interface with TTL levels  

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