HD74HC423A Dual Retriggerable Monostable Multivibrators Description This multivibrator features output-pulse-duration control by two methods. The basic pulse duration is programmed by selection of external resistance and capacitance values. Once triggered, the basic pulse duration may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. The B input is a Schmitt trigger enabling jitter-free triggering from input signals with slow transition rates. Features • • • • • High Speed Operation High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current Function Table Inputs Output Clear A B Q Q L X X L H X H X L H X X L L H H L H H HD74HC423A Pin Arrangement 1A 1 16 VCC 1B 2 15 1Rext/Cext 1CLR 3 14 1Cext 1Q 4 13 1Q 2Q 5 12 2Q 2Cext 6 11 2CLR 2Rext/Cect 7 10 2B GND 8 9 2A CLR CLR Logic diagram Rext Cext VCC VH VL OUT A B CLR CK CLR To Another Transceiver 2 Q CK Q HD74HC423A DC Characteristics Sym- VCC Ta = 25°C Item bol (V) Input voltage VIH 2.0 1.5 — 1.5 4.5 3.15 — — 3.15 — 6.0 4.2 — — 4.2 — 2.0 — — 0.5 — 0.5 4.5 — — 1.35 — 1.35 6.0 — — 1.8 — 1.8 2.0 1.9 2.0 — 1.9 — 4.5 4.4 4.5 — 4.4 — 6.0 5.9 6.0 — 5.9 — 4.5 4.18 — — 4.13 — IOH = –4 mA 6.0 5.68 — — 5.63 — IOH = –5.2 mA 2.0 — 0.0 0.1 — 0.1 4.5 — 0.0 0.1 — 0.1 6.0 — 0.0 0.1 — 0.1 4.5 — — 0.26 — 0.33 IOL = 4 mA 6.0 — — 0.26 — 0.33 IOL = 5.2 mA Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND ICC 6.0 — — 130 — 220 µA Vin = VCC or Iout = 0 µA — — 130 — 220 GND Rext/Cext = 0.5 VCC VOH VOL Input current Quiescent Standby state supply current Active state Typ Max Min Max Unit Test Conditions — VIL Output voltage Min Ta = –40 to +85°C — V V V V Vin = VIH or VIL Vin = VIH or VIL IOH = –20 µA IOL = 20 µA 3 HD74HC423A AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C VCC (V) Min Typ Max Min Max Unit Test Conditions Propagation delay t PLH 2.0 — — 210 — 265 ns A or B to Q time 4.5 — 20 42 — 53 6.0 — — 36 — 45 2.0 — — 240 — 300 ns A or B to Q 4.5 — 21 48 — 60 6.0 — — 41 — 51 2.0 — — 170 — 215 ns Clear to Q 4.5 — 17 34 — 43 6.0 — — 29 — 37 2.0 — — 180 — 225 ns Clear to Q 4.5 — 15 36 — 45 6.0 — — 31 — 38 2.0 150 — — 190 — ns A, B, Clear 4.5 30 6 — 38 — 6.0 26 — — 33 — 2.0 0 — — 5 — ns Clear 4.5 0 –3 — 5 — 6.0 0 — — 5 — 2.0 — 1.5 — — — µs Cext = 28 pF 4.5 — 450 — — — ns Rext = 2 kΩ 6.0 — 380 — — — Output pulse width t WQ 4.5 — 1.0 — — — ms Cext = 0.1 µF, Rext = 10 kΩ Output rise/fall t TLH 2.0 — — 75 — 95 ns time t THL 4.5 — 5 15 — 19 6.0 — — 13 — 16 — — — 20 — 20 — — 5 10 — 10 Item Symbol t PHL t PHL t PLH Pulse width Removal time Minimum output tw t rem t WQ (min) pulse width Input capacitance Cin pF Rext = 6 kΩ Pins 7 & 15 Other pins Caution in use: In order to prevent any malfunctions due to noise, connect a highfrequency performance capacitor between V CC and GND, and keep the wiring between the external components and Cext, Rext/Cext pins as short as possible. 4 Unit: mm 19.20 20.00 Max 1 7.40 Max 9 6.30 16 8 1.3 0.48 ± 0.10 2.54 Min 5.06 Max 2.54 ± 0.25 0.51 Min 1.11 Max 7.62 + 0.13 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 9 1 8 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.10 ± 0.10 0.80 Max *0.22 ± 0.05 0.20 ± 0.04 2.20 Max 5.5 16 0.20 7.80 +– 0.30 1.15 0° – 8° 0.70 ± 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA — Conforms 0.24 g Unit: mm 9.9 10.3 Max 9 1 8 0.635 Max *0.42 ± 0.08 0.40 ± 0.06 0.15 *0.22 ± 0.03 0.20 ± 0.03 1.27 0.11 0.14 +– 0.04 1.75 Max 3.95 16 0.10 6.10 +– 0.30 1.08 0° – 8° 0.67 0.60 +– 0.20 0.25 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DN Conforms Conforms 0.15 g Cautions 1. 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