HD74HC221 Dual Monostable Multivibrators (with Schmitt Trigger Input) Description Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit. Also included is a clear inpt that when taken low resets the one shot. The HD74HC221 can be triggered on the positive transition of teh clear while A is held low and B is held high. This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out. The output pulse equation is simply: tW = 0.7·(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 HD74HC221 Pin Arrangement 1A 1 16 VCC 1B 2 15 1 Rext/ Cext CLR1 3 14 1 Cext 13 1Q 12 2Q 1Q 4 2Q 5 CLR Q Q Q Q CLR Cext 2 6 11 2CLR 2 Rext/ Cext 7 10 2B GND 8 9 2A (Top view) Logic Diagram VCC Rext Cext Cext Rext /Cext A B Q Clear Clear 2 Q Q HD74HC221 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 VIL Output voltage VOH VOL — — 1.5 — V 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 — I OH = –4 mA 6.0 5.68 — — 5.63 — I OH = –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 I OL = 4 mA 6.0 — — 0.26 — 0.33 I OL = 5.2 mA V V V Input current Iin 6.0 — — ±0.1 — ±1.0 µA Quiescent supply I CC 6.0 — — 130 — 220 6.0 — — 130 — 220 current µA Vin = VIH or VIL Vin = VIH or VIL I OH = –20 µA I OL = 20 µA Vin = VCC or GND Vin = VCC or GND Iout = 0 µA Rext/Cent = 0.5 VCC 3 HD74HC221 AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) Ta = –40 to +85°C Ta = 25°C Item Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions Trigger t PLH 2.0 — — 210 — 265 ns A, B or Clear to Q propagation delay 4.5 — — 42 — 53 time 6.0 — — 36 — 45 2.0 — — 240 — 300 ns A, B or Clear to Q 4.5 — — 48 — 60 6.0 — — 41 — 51 Propagation delay t PHL 2.0 — — 170 — 215 ns Clear to Q time 4.5 — — 34 — 43 6.0 — — 29 — 37 2.0 — — 180 — 225 ns Clear to Q 4.5 — — 36 — 45 6.0 — — 31 — 38 2.0 80 — — 100 — ns A, B, Clear 4.5 16 — — 20 — 6.0 14 — — 17 — 2.0 — 1.5 — — — µs Cext = 28 pF 4.5 — 450 — — — ns 6.0 — 380 — — — Output pulse width t WQ 4.5 0.63 0.7 0.77 — — ms Output rise/fall t TLH 2.0 — — 75 — 95 ns time t THL 4.5 — — 15 — 19 6.0 — — 13 — 16 — — 5 10 — 10 t PHL t PLH Pulse width Minimum output tw t WQ (min) pulse width Input capacitance Caution in use: 4 Cin Rext = 6 kΩ Rext = 2 kΩ Cext = 0.1 µF Rext = 10 kΩ pF 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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