HD74HC123A Dual Retriggerable Monostable Multivibrators (with Clear) Description This multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one shot. The HD74HC123A can be triggered on the positive transition of the clear while A is held low and B is held high. The HD74HC123A is retriggerable. That is it may be triggered repeatedly while their outputs are generating a pulse and the pulse will be extended. Pulse width stability over a wide range of temperature. The output pulse equation is simply: t w = (Rext) (Cext). 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 Outputs Clear A B Q Q L X X L H X H X L H X X L L H H L H H L H Note: External timing capacitance connects between Cext and Rext/Cext. HD74HC123A Pin Arrangement 1A 1 16 VCC 1B 2 15 1Rext Cext 1CLR 3 1Q 4 13 1Q 2Q 5 12 2Q 2Cext 6 2Rext/ Cext 7 10 2B GND 8 9 CLR Q Q Q Q CLR (Top view) 2 14 1Cext 11 2CLR 2A HD74HC123A DC Characteristics Ta = –40 to +85°C Sym- VCC Ta = 25°C Item bol (V) Min Typ Max Min Max Unit Test Conditions 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 VIL Output voltage VOH VOL Input current Quiescent Standby state supply current Active state — V V V V Vin = VIH or VIL IOH = –20 µA Vin = VIH or VIL IOL = 20 µA 3 HD74HC123A 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, B or Clear to Q time 4.5 — 22 42 — 53 6.0 — — 36 — 45 2.0 — — 240 — 300 ns A, B or Clear to Q 4.5 — 23 48 — 60 6.0 — — 41 — 51 2.0 — — 170 — 215 ns Clear to Q 4.5 — 18 34 — 43 6.0 — — 29 — 37 2.0 — — 180 — 225 ns Clear to Q 4.5 — 16 36 — 45 6.0 — — 31 — 38 2.0 — — 75 — 95 4.5 — 5 15 — 19 6.0 — — 13 — 16 2.0 — — 75 — 95 4.5 — 5 15 — 19 6.0 — — 13 — 16 2.0 150 — — 190 — 4.5 30 6 — 38 — 6.0 26 — — 33 — 2.0 — 1.5 — — 4.5 — 450 — 6.0 — Output pulse width t WQ 4.5 Input capacitance — Item Symbol t PHL t PHL t PLH Output rise time Output fall time Pulse width Minimum output t TLH t THL tw t WQ(min) pulse width Caution in use: 4 Cin ns ns ns A, B, Clear — µs Cext = 28 pF — — ns Rext = 2 kΩ 380 — — — — 1.0 — — — ms Cext = 0.1 µF, Rext = 10 kΩ — 5 — 10 pF 10 Rext = 6 kΩ In order to prevent any malfunctions due to noise, connect a high-frequency performance capacitor between V CC and GND, and keep the wiring between the External components and Cext, Rext/Cext pins as short as possible. 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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