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Part Number 74221
Manufacturers Hitachi Semiconductor
Logo Hitachi Semiconductor
Description Dual Monostable Multivibrators
Datasheet 74221 Datasheet74221 Datasheet (PDF)

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 ti.

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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 Clear L X X H H L A X H X L H H B X X L Outputs Q L L L Q H H H HD74HC221 Pin Arrangement 1A 1B CLR1 1Q 2Q Cext 2 2 Rext/ Cext GND 1 2 3 4 5 Q CLR Q Q 16 15 14 13 12 11 10 9 (Top view) VCC 1 Rext/ Cext 1 Cext 1Q 2Q 2CLR 2B 2A Q CLR 6 7 8 Logic Diagram VCC Rext Cext Cext Rext /Cext A B Q Clear Q Q Clear 2 HD74HC221 DC Characteristics Sym- VCC Ta = 25°C Item Input voltage bol VIH Ta = –40 to +85°C (V) Min Typ Max Min Max Unit Test Conditions 2.0 1.5 — — — — 0.5 1.5 — V 4.5 3.15 — 6.0 4.2 VIL 2.0 — 4.5 — 6.0 — Output voltage VOH 2.0 1.9 4.5 4.4 6.0 5.9 — — — — 2.0 4.5 6.0 3.15 — 4.2 — — 0.5 1.35 1.8 — — — I OH = –4 mA I OH = –5.2 mA V Vin = VIH or VIL I OL = 20 µA V Vin = VIH or VIL I OH = –20 µA V 1.35 — 1.8 — — — — — 0.1 0.1 0.1 — 1.9 4.4 5.9 4.5 4.18 — 6.0 5.68 — VOL 2.0 — 4.5 — 6.0 — 4.5 — 6.0 — Input current Quiescent supply current Iin I CC 6.0 — 6.0 — 6.0 — 0.0 0.0 0.0 — — — — — 4.13 — 5.63 — — — — 0.1 0.1 0.1 0.33 0.33 ±1.0 µA 220 220 µA Vin = VCC or GND 0.26 — 0.26 — ±0.1 — 130 — 130 — I OL = 4 mA I OL = 5.2 mA 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 = 25°C Item Trigger propagation delay time t PHL Symbol t PLH Ta = –40 to +85°C Max 265 53 45 300 60 51 215 43 37 225 45 38 — — — — — — — 95 19 16 10 pF ms ns Cext = 0.1 µF Rext = 10 kΩ µs ns Cext = 28 pF Rext = 6 kΩ Rext = 2 kΩ ns A, B, Clear ns Clear to Q ns Clear to Q ns A, B or Clear to Q Unit ns Test Conditions A, B or Clear to Q VCC (V) Min Typ Max Min 2.0 4.5 6.0 2.0 4.5 6.0 — — — — — — — — — — — — 80 16 14 — — — — — — — — — — — — — — — — — — 210 — 42 36 — — 240 — 48 41 — — Propagation delay t PHL time 2.0 4.5 6.0 170 — 34 29 — — t PLH 2.0 4.5 6.0 180 — 36 31 — — — — — 100 20 17 — — — Pulse width tw 2.0 4.5 6.0 Minimum output pulse width t WQ (min) 2.0 4.5 6.0 1.5 — 450 — 380 — Output pulse width t WQ Output rise/fall time t TLH t THL 4.5 2.0 4.5 6.0 0.63 0.7 0.77 — — — — — — — — 5 75 15 13 10 — — — — Input capacitance Caution in use: Cin — 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. 4 19.20 20.00 Max 16 9 7.40 Max 6.30 Unit: mm 1 1.3 1.11 Max 8 0.51 Min 2.54 Min 5.06 Max 7.62 2.54 ± 0.25 0.48 ± 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) + 0.13 DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 16 9 5.5 1 *0.22 ± 0.05 0.20 ± 0.04 8 0.80 Max 2.20 Max 0.20 7.80 + – 0.30 1.15 0° – 8° 0.70 ± 0.20 1.27 *0.42 ± 0.08 0.40 ± 0.06 0.12 M Hitachi Code JEDEC EIAJ Weight (reference value) FP-16DA — Conforms 0.24 g *Dimension including the plating thickness Base material dimension 0.10 ± 0.10 0.15 Unit: mm 9.9 10.3 Max 16 9 3.95 1 1.27 0.635 Max 8 0.11 0.14 + – 0.04 1.75 Max *0.22 ± 0.03 0.20 ± 0.03 0.10 6.10 + – 0.30 1.08 0° – 8° 0.67 0.60 + – 0.20 *0.42 ± 0.08 0.40 ± 0.06 0.15 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. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, .


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