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HD74AC123A
Dual Retriggerable Resettable Multivibrator
Description
Each half of the HD74AC123A features retriggerable capability, complementary dc level triggering and overriding Direct Clear. When a circuit is in the quasi-stable (delay) state, another trigger applied to the inputs (per the Truth Table) will cause the delay period to start again, without disturbing the outputs. By repeating this process, the output pulse period (Q High, Q Low) can be made as long as desired. Alternatively, a delay period can be terminated at any time by a Low signal on C D, which also inhibits triggering. An internal connection from C D to the input gate makes it possible to trigger the circuit by a positive-going signal on C D, as shown in the Truth Table. For timing capacitor values greater than 1000 pF, the output pulse width is defined as follows. Where tw is in ns, RX is in k and C tw = RXCX
X
is in pF.
Feature
* Outputs Source/Sink 24 mA
HD74AC123A
Pin Arrangement
A1 1 B1 2 CD1 3 Q1 4 Q2 5 CX2 6 RX2CX2 7 GND 8 (Top view)
16 VCC 15 RX1CX1 14 CX1 13 Q1 12 Q2 11 CD2 10 B2 9 A2
Logic Symbol
76 (15) (14) RXCX CX Q 9(1) A 10(2) B Q CD 12(4) 5(13)
11 (3) VCC = Pin16 GND = Pin8
2
HD74AC123A
Pin Names
A1, A 2 B 1, B 2 C D1, CD2 Q1, Q2 Q1, Q 2 Trigger Inputs (Active Falling Edge) Trigger Inputs (Active Rising Edge) Direct Clear Inputs (Active Low) Positive Pulse Outputs Negative Pulse Outputs
Triggering Truth Table
Inputs A X B X L H H L L H: L: X: : : H High Voltage Level Low Voltage Level Immaterial Low-to-High Transition High-to-Low Transition CD L X H X H Response No trigger No trigger Trigger No trigger Trigger Trigger
DC Characteristics (unless otherwise specified)
Item Maximum quiescent supply current Maximum quiescent supply current Symbol I CC I CC Max 80 8.0 Unit A A Condition VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case VIN = VCC or ground, VCC = 5.5 V, Ta = 25C
3
HD74AC123A
AC Characteristics: HD74AC123A
Ta = +25C CL = 50 pF Item Propagation delay A or B to Q Propagation delay A or B to Q Propagation delay CDn to Q Propagation delay CDn to Q Note: t PHL t PLH t PHL Symbol t PLH VCC (V)*1 Min 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Typ -- -- -- -- -- -- -- -- Max 19.0 15.0 19.0 15.0 15.0 12.0 15.0 12.0 Ta = -40C to +85C CL = 50 pF Min 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Max 22.0 17.0 22.0 17.0 18.0 13.5 18.0 13.5 ns ns ns Unit ns Condition Cext = 0 pF Rest = 5 k
1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V
AC Operating Requirements: HD74AC123A
Ta = +25C CL = 50 pF Item Pulse width A or B or CDn Recovery time CDn to A or B Note: t rec Symbol tw VCC (V)*1 3.3 5.0 3.3 5.0 Typ -- -- -- -- Ta = -40 to +85C CL = 50 pF Guaranteed Minimum 5.0 4.5 2.0 2.0 7.0 5.0 2.0 2.0 ns Unit ns Condition Cext = 0 pF Rext = 5 k
1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V
4
HD74AC123A
Ta = +25C CL = 50 pF Item Output pulse width Symbol TWQ VCC (V)*1 3.3 5.0 Minimum output pulse width Note: TWQ(min) 3.3 5.0 Min -- 0.90 190 160 Typ -- -- -- -- Max -- 1.10 350 300 Ta = -40C to +85C CL = 50 pF Min -- 0.85 170 140 Max -- 1.15 380 330 ns Unit ms Condition Cext = 0.1 F Rext = 10 k Cext = 28 pF Rext = 2 k
1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V Cext and Rext should be connected as close to the IC terminals as possible, in order to prevent malfunction.
5
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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