74LV123DB,118 Nexperia

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 ). These are normally connected as shown in Figure 9. EXT 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 = 2.7 V and V = 3.6 V CC CC Typical output ground bounce: < 0.8 V at V = 3.3 V and T = 25 C CC amb Typical HIGH-level output voltage (V ) undershoot: > 2 V at V = 3.3 V and OH CC T = 25 C amb 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 input74LV123 NXP Semiconductors Dual retriggerable monostable multivibrator with reset 3. Ordering information Table 1. Ordering information Type number Package Temperature range Name Description Version 74LV123N 40 Cto+125 C DIP16 plastic dual in-line package 16 leads (300 mil) SOT38-4 74LV123D 40 Cto+125 C SO16 plastic small outline package 16 leads body width SOT109-1 3.9 mm 74LV123DB 40 Cto+125 C SSOP16 plastic shrink small outline package 16 leads body width SOT338-1 5.3 mm 74LV123PW 40 Cto+125 C TSSOP16 plastic thin shrink small outline package 16 leads body SOT403-1 width 4.4 mm 74LV123BQ 40 Cto+125 C DHVQFN16 plastic dual in-line compatible thermal enhanced very thin SOT763-1 quad flat package no leads 16 terminals body 2.5 3.5 0.85 mm 4. Functional diagram 14 CX 15 RCX 13 1 & 14 1CEXT 2 6 2CEXT 15 1REXT/CEXT 4 7 2REXT/CEXT 3 R S 13 1Q Q 6 5 2Q CX 1A 1 T 7 2A 9 RCX 5 4 1Q Q 9 1B 2 & 12 2Q 2B 10 10 RD 1RD 3 12 2RD 11 11 R 001aae521 001aae522 Fig 1. Logic symbol Fig 2. IEC logic symbol 74LV123 All information provided in this document is subject to legal disclaimers. NXP B.V. 2011. All rights reserved. Product data sheet Rev. 7 12 December 2011 2 of 24