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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 A max Low Quiescent Supply Current
Function Table
Inputs Clear L X X H H A X H X L H B X X L Output Q L L L Q H H H
HD74HC423A
Pin Arrangement
1A 1B 1CLR 1Q 2Q 2Cext 2Rext/Cect GND
1 2 3 4 5 6 7 8 CLR CLR
16 15 14 13 12 11 10 9
VCC 1Rext/Cext 1Cext 1Q 2Q 2CLR 2B 2A
Logic diagram
Rext Cext VCC VH VL
OUT
Q Q
A B CLR
CK CK CLR
To Another Transceiver
2
HD74HC423A
DC Characteristics
SymItem Input voltage bol VIH VCC Ta = 25C (V) Min Ta = -40 to +85C
Typ Max Min Max Unit Test Conditions -- -- -- -- 0.5 1.5 -- V
2.0 1.5
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 -- -- -- IOH = -4 mA IOH = -5.2 mA V Vin = VIH or VIL IOL = 20 A V Vin = VIH or VIL IOH = -20 A 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 Standby state Iin ICC 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 A 220 A 220 Vin = VCC or GND Vin = VCC or GND
0.26 -- 0.26 -- 0.1 -- 130 130 -- --
IOL = 4 mA IOL = 5.2 mA
Iout = 0 A Rext/Cext = 0.5 VCC
supply current Active state
3
HD74HC423A
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25C Item Symbol Ta = -40 to +85C Max 265 53 45 300 60 51 215 43 37 225 45 38 -- -- -- -- -- -- -- -- -- -- 95 19 16 20 10 pF Pins 7 & 15 Other pins ms ns Cext = 0.1 F, Rext = 10 k s ns Cext = 28 pF Rext = 6 k Rext = 2 k ns Clear ns A, B, Clear ns Clear to Q ns Clear to Q ns A or B to Q Unit ns Test Conditions A or B to Q
VCC (V) Min Typ Max Min 2.0 4.5 6.0 -- -- -- -- -- -- -- -- -- -- -- -- -- 20 -- -- 21 -- -- 17 -- -- 15 -- 210 -- 42 36 -- --
Propagation delay t PLH time
t PHL
2.0 4.5 6.0
240 -- 48 41 -- --
t PHL
2.0 4.5 6.0
170 -- 34 29 -- --
t PLH
2.0 4.5 6.0
180 -- 36 31 -- -- -- -- -- -- -- -- 190 38 33 5 5 5 -- -- -- -- -- -- -- -- --
Pulse width
tw
2.0 4.5 6.0
150 -- 30 26 0 0 0 -- -- -- -- -- -- -- -- -- 6 -- -- -3 --
Removal time
t rem
2.0 4.5 6.0
Minimum output pulse width
t WQ (min)
2.0 4.5 6.0
1.5 -- 450 -- 380 -- 1.0 -- -- 5 -- -- 5 75 15 13 20 10
Output pulse width t WQ Output rise/fall time t TLH t THL
4.5 2.0 4.5 6.0
Input capacitance
Cin
-- --
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
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, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products.
Hitachi, Ltd.
Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
URL
NorthAmerica : http:semiconductor.hitachi.com/ Europe : http://www.hitachi-eu.com/hel/ecg Asia (Singapore) : http://www.has.hitachi.com.sg/grp3/sicd/index.htm Asia (Taiwan) : http://www.hitachi.com.tw/E/Product/SICD_Frame.htm Asia (HongKong) : http://www.hitachi.com.hk/eng/bo/grp3/index.htm Japan : http://www.hitachi.co.jp/Sicd/indx.htm For further information write to:
Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 778322 Hitachi Asia Pte. Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: <886> (2) 2718-3666 Fax: <886> (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: <852> (2) 735 9218 Fax: <852> (2) 730 0281 Telex: 40815 HITEC HX
Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.

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