74VHC123AFT,74VHC221AFT1CMOS Digital Integrated Circuits Silicon Monolithic74VHC123AFT,74VHC221AFT74VHC123AFT,74VHC221AFT74VHC123AFT,74VHC221AFT74VHC123AFT,74VHC221AFTStart of commercial production2013-051.1.1.1. Functional DescriptionFunctional DescriptionFunctional DescriptionFunctional Description•Dual Monostable Multivibrator74VHC123AFT: Retriggerable74VHC221AFT: Non-Retriggerable2.2.2.2. GeneralGeneralGeneralGeneralThe 74VHC123A/221AFT are high speed CMOS MONOSTABLE MULTIVIBRATOR fabricated with silicongate C2MOS technology.There are two trigger inputs, A input (negative edge), and B input (positive edge). These inputs are valid for aslow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. This device may also be triggered byusing CLR input (positive edge).After triggering, the output stays in a MONOSTABLE state for a time period determined by the external resistorand capacitor (RX, CX). A low level at the CLR input breaks this state.Limits for CX and RX are:External capacitor, CX: No limitExternal resistor, RX: VCC = 2.0 V more than 5 kΩVCC ≥ 3.0 V more than 1 kΩAn input protection circuit ensures that 0 to 5.5 V can be applied to the input pins without regard to the supplyvoltage. This device can be used to interface 5 V to 3 V systems and two supply systems such as battery back up.This circuit prevents device destruction due to mismatched supply and input voltages.3.3.3.3. Features (Note)Features (Note)Features (Note)Features (Note)(1)AEC-Q100 (Rev. H) (Note 1)(2)Wide operating temperature range: Topr = -40 to 125 (3)High speed: Propagation delay time = 8.1 ns (typ.) at VCC = 5 V(4)Low power dissipation:Standby state: 4.0 µA (max) at Ta = 25 Active state: 750 µA (max) at Ta = 25 (5)High noise immunity: VNIH = VNIL = 28 % VCC (min)(6)Power-down protection is provided on all inputs.(7)Balanced propagation delays: tPLH≈ tPHL(8)Wide operating voltage range: VCC(opr) = 2.0 V to 5.5 V(9)Pin and function compatible with 74HC123,74HC221 type.Note:In the case of using only one circuit,CLR should be tied to GND, RX/CXCXQQ should be tied to OPEN,the other inputs should be tied to VCC or GND.Note 1: This device is compliant with the reliability requirements of AEC-Q100. For details, contact your Toshiba salesrepresentative.2017-03-08Rev.7.0©2016 Toshiba Corporation
