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74HCT123DB NRND ECAD models PCB Symbol, Footprint & ECAD Model

Dual retriggerable monostable multivibrator with reset

The 74HC123; 74HCT123 are high-speed Si-gate CMOS devices and are pin compatible with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC123; 74HCT123 are dual retriggerable monostable multivibrators with output pulse width control 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 (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. Alternatively an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering.
  3. An internal connection from nRD to the input gates makes it possible to trigger the circuit by a HIGH-going signal at input nRD as shown in the function table.

Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times.

The 74HC123; 74HCT123 are identical to the 74HC423; 74HCT423 but can be triggered via the reset input.

不建议用在新设计中(NRND),替代产品使用单击此处

可订购部件

型号 可订购的器件编号 订购代码(12NC) 封装 从经销商处购买
74HCT123DB 74HCT123DB,118 935186840118 SOT338-1 订单产品
74HCT123DB 74HCT123DB,112 935186840112 SOT338-1 订单产品

特性

  • 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 action on all inputs except for the reset input
  • ESD protection:
    • HBM JESD22-A114F exceeds 2000 V
    • MM JESD22-A115-A exceeds 200 V
  • Specified from -40 ℃ to +85 ℃ and from -40 ℃ to +125 ℃

目标应用

参数类型

型号Product statusVCC (V)Logic switching levelsOutput drive capability (mA)tpd (ns)Power dissipation considerationsTamb (°C)Rth(j-a) (K/W)Ψth(j-top) (K/W)Package name
74HCT123DB
NRND
Not for design in4.5 - 5.5TTL+/- 426low-40~12514842.0SSOP16

Package

型号可订购的器件编号,(订购码(12NC))状态标示封装尺寸版本回流焊/波峰焊包装
74HCT123DB
NRND
74HCT123DB,118
( 9351 868 40118 )
ActiveHCT123
SSOP16
(SOT338-1)
SOT338-1SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE
Reel 13" Q1/T1
74HCT123DB,112
( 9351 868 40112 )
ActiveHCT123Bulk Pack

品质、可靠性及化学成分

型号可订购的器件编号化学成分RoHS / RHFMSLMSL无铅
74HCT123DB
NRND
74HCT123DB,11874HCT123DB11
74HCT123DB
NRND
74HCT123DB,11274HCT123DB11
品质及可靠性免责声明

文档 (7)

文件名称标题类型日期
74HC_HCT123Dual retriggerable monostable multivibrator with resetData sheet2017-03-30
AN11044Pin FMEA 74HC/74HCT familyApplication note2019-01-09
hchc Spice modelSPICE model2013-05-06
HCT_USER_GUIDEHC/T User GuideUser manual1997-10-31
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave soldering2009-10-08
SSOP-TSSOP-VSO-REFLOWFootprint for reflow solderingReflow soldering2009-10-08
SOT338-1plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm bodyOutline drawing2018-10-18

支持

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模型

文件名称标题类型日期
hchc Spice modelSPICE model2013-05-06

订购、定价与供货

型号Orderable part numberOrdering code (12NC)包装在线购买
74HCT123DB74HCT123DB,118935186840118Reel 13" Q1/T1订单产品
74HCT123DB74HCT123DB,112935186840112Bulk Pack订单产品

样品

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