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74AHC123A Dataheets PDF



Part Number 74AHC123A
Manufacturers NXP
Logo NXP
Description Dual retriggerable monostable multivibrator
Datasheet 74AHC123A Datasheet74AHC123A Datasheet (PDF)

INTEGRATED CIRCUITS DATA SHEET 74AHC123A; 74AHCT123A Dual retriggerable monostable multivibrator with reset Product specification File under Integrated Circuits, IC06 2000 Mar 15 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset FEATURES • ESD protection: HBM EIA/JESD22-A114-A exceeds 2000 V MM EIA/JESD22-A115-A exceeds 200 V CDM EIA/JESD22-C101 exceeds 1000 V • All inputs have Schmitt-trigger actions • Inputs accept voltages higher than VCC •.

  74AHC123A   74AHC123A


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INTEGRATED CIRCUITS DATA SHEET 74AHC123A; 74AHCT123A Dual retriggerable monostable multivibrator with reset Product specification File under Integrated Circuits, IC06 2000 Mar 15 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset FEATURES • ESD protection: HBM EIA/JESD22-A114-A exceeds 2000 V MM EIA/JESD22-A115-A exceeds 200 V CDM EIA/JESD22-C101 exceeds 1000 V • All inputs have Schmitt-trigger actions • Inputs accept voltages higher than VCC • For AHC only: operates with CMOS input levels • For AHCT only: operates with TTL input levels • Specified from −40 to +85 °C and −40 to +125 °C • DC triggered from active HIGH or active LOW inputs • Retriggerable for very long pulses up to 100% duty factor • Direct reset terminates output pulse • Output capability: standard (except for nREXT/CEXT). DESCRIPTION The 74AHC/AHCT123A 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 74AHC/AHCT123A are dual retriggerable monostable multivibrators with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). The external resistor and capacitor are normally connected as shown in Fig.6. 74AHC123A; 74AHCT123A 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. An internal connection from nRD to the input gate makes it possible to trigger the circuit by a positive-going signal at input nRD as shown in the function table. Figs 8 and 9 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the value of the external timing components REXT and CEXT. When CEXT ≥ 10 nF, the typical output pulse width is defined as: tW = REXT × CEXT where tW = pulse width in ns; REXT = external resistor in kΩ; CEXT = external capacitor in pF. Schmitt-trigger action at all inputs makes the circuit highly tolerant to slower input rise and fall times. The ‘123’ is identical to the ‘423’ but can be triggered via the reset input. 2000 Mar 15 2 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset QUICK REFERENCE DATA GND = 0 V; Tamb = 25 °C; tr = tf ≤ 3.0 ns. 74AHC123A; 74AHCT123A TYPICAL SYMBOL tPHL/tPLH PARAMETER propagation delay nA, nB to nQ, nQ nRD to nQ, nQ CI CO CPD Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW). PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) × CEXT × VCC2 × fo + D × 16 × VCC where: fi = input frequency in MHz; fo = output frequency in MHz; ∑ (CL × VCC2 × fo) = sum of outputs; D = duty factor in %; CL = output load capacitance in pF; CEXT = timing capacitance in pF; VCC = supply voltage in Volts. 2. The condition is VI = GND to VCC. input capacitance output capacitance power dissipation capacitance CL = 50 pF; f = 1 MHz; notes 1 and 2 VI = VCC or GND CONDITIONS AHC CL = 15 pF; VCC = 5 V; REXT = 5 kΩ; CEXT = 0 pF 5.1 5.6 5 4 57 AHCT 5.0 5.2 3 4 58 ns ns pF pF pF UNIT 2000 Mar 15 3 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset FUNCTION TABLE See note 1. INPUTS nRD L X X H H ↑ Notes 1 H = HIGH voltage level; L = LOW voltage level; X = don’t care; ↑ = LOW-to-HIGH CP transition; ↓ = HIGH-to-LOW CP transition. 2 3 4 nA X H X L ↓ L nB X X L ↑ H H nQ L L(2) L(2) (3) (3) (3) 74AHC123A; 74AHCT123A OUTPUTS nQ H H(2) H(2) (4) (4) (4) If the monostable multivibrator was triggered before this condition was established, the pulse will be continued as programmed. One HIGH-level output pulse. One LOW-level output pulse. ORDERING INFORMATION PACKAGES TYPE NUMBER 74AHC123AD 74AHC123APW 74AHCT123AD 74AHCT123APW TEMPERATURE RANGE −40 to +125 °C PINS 16 16 16 16 PACKAGE SO TSSOP SO TSSOP MATERIAL plastic plastic plastic plastic CODE SOT109-1 SOT403-1 SOT109-1 SOT403-1 2000 Mar 15 4 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset PINNING PIN 1, 9 2, 10 3, 11 4, 12 5, 13 6, 14 7, 15 8 16 1A, 2A 1B, 2B 1RD, 2RD 1Q, 2Q 2Q, 1Q 2CEXT, 1CEXT 2REXT/CEXT, 1REXT/CEXT GND VCC SYMBOL 74AHC123A; 74AHCT123A DESCRIPTION trigger inputs (negative-edge triggered) trigger inputs (positive-edge triggered) direct reset LOW and trigger action at positive edge outputs (active LOW) outputs (active HIGH) external capacitor connection external resistor/capacitor connection ground (0 V) DC supply voltage handbook, halfpage handbook, halfpage 1A 1 1B 2 1RD 3 1Q 4 16 VCC 15 1REXT/CEXT 14 1CEXT 13 1Q S 1 1A 9 2A T Q RD Q 1CEXT 14 2CEXT 6 1RE.


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