View HD74HC646_101062.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

HD74HC646/HD74HC648
Octal Bus Transceivers/Registers with Multiplexed 3-state outputs
Description
Six control inputs enable this device to be used as a latched transceiver, unlatched transceiver or a combination of both. As a latched transceiver, data from one bus is stored for later retrieval by the other bus. Alternately real time bus data (unlatched) may be directly transferred from one bus to another. Circuit operation is determined by the Control G, Direction, Clock AB, Clock BA, Select AB, Select BA control inputs. The enable input, Contorl G, controls whether any bus outputs are enabled. The direction control Direction (DIR), determines which bus is enabled, and hence the direction data flows: The Select AB, Select BA inputs cotrol whether the latched data (stored in D type flip-flops), or the bus data (from other bus input pins) is transferred. Each set of flip-flops has its own clock Clock AB and Clock BA, for storing data. Data is latched on the rising edge of the clock.
Features
* * * * * High Speed Operation: tpd (Bus to Bus) = 14 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 A max Low Quiescent Supply Current: ICC (static) = 4 A max (Ta = 25C)
HD74HC646/HD74HC648
Function Table
Inputs Control G H H L L L L L L Clock Select Data I/O Data I/O Operation or Function HD74HC648 Isolation Store A & B data B real-time data to A bus B stored data to A bus B stored data to A bus A real-time data to B bus A stored data to B bus A stored data to B bus
Direction BA AB AB X X L L L H H H X H L X H L X H L X H L X X X H X X X L H H
BA A1 thru A8 B1 thru B8 HD74HC646 X H L H H X X X Z (Input) Z (Input) Output Output Output Z (Input) Z (Input) Z (Input) Z (Input) Z (Input) Z (Input) Z (Input) Z (Input) Output Output Output Isolation Store A & B data B real-time data to A bus B stored data to A bus B stored data to A bus A real-time data to B bus A stored data to B bus A stored data to B bus
Bus A
Bus A
Bus B
Real-time transfer Bus B to Bus A
Real-time transfer Bus A to Bus B
2
Bus B
HD74HC646/HD74HC648
Bus A
Bus B
Bus A
Storage from A, B, or A and B
Transfer stored data to A or B
Pin Arrangement
Clock AR Select AB Direciton A1 A2 A3 A4 A5 A6
1 2 3 4 5 6 7 8 9
24 23 22 21 20 19 18 17 16 15 14 13
VCC Clock BA Select BA Control G B1 B2 B3 B4 B5 B6 B7 B8
A7 10 A8 11 GND 12
(Top view)
Bus B
3
HD74HC646/HD74HC648
Absolute Maximum Ratings
Item Supply voltage range Input voltage Output voltage Output current DC current drain per VCC , GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT I OUT I CC, I GND I IK I OK PT Tstg Rating -0.5 to +7.0 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 35 75 20 20 500 -65 to +150 Unit V V V mA mA mA mA mW C
Logic Diagram
HD74HC646
x7
VCC Q CBA CBA
A1
Q CAB CAB
D
VCC
D
B1
CAB SAB SBA
CBA DIR G
4
HD74HC646/HD74HC648
HD74HC648
x7
VCC Q CBA CBA
A1
Q CAB CAB
D
VCC
D
B1
CAB SAB SBA
CBA DIR G
5
HD74HC646/HD74HC648
DC Characteristics
Ta = 25C Item Input voltage Symbol VIH Ta = -40 to +85C Max -- -- -- 0.5 1.35 1.8 -- -- -- -- -- 0.1 0.1 0.1 0.33 0.33 5.0 1.0 40 A A A I OL = 6 mA I OL = 7.8 mA Vin = VIH or VIL, Vout = VCC or GND Vin = VCC or GND Vin = VCC or GND, Iout = 0 A V I OH = -6 mA I OH = -7.8 mA Vin = VIH or VIL I OL = 20 A V Vin = VIH or VIL I OH = -20 A V Unit V Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 1.5 -- 3.15 -- 4.2 -- -- -- -- -- -- -- -- -- -- 0.5 1.5 3.15 4.2 --
VIL
2.0 4.5 6.0
1.35 -- 1.8 -- 1.9 4.4 5.9 4.13 5.63 -- -- --
Output voltage
VOH
2.0 4.5 6.0 4.5 6.0
1.9 2.0 -- 4.4 4.5 -- 5.9 6.0 -- 4.18 -- 5.68 -- -- -- -- -- -- -- -- -- -- --
VOL
2.0 4.5 6.0 4.5 6.0
0.0 0.1 0.0 0.1 0.0 0.1 -- -- -- -- --
0.26 -- 0.26 -- 0.5 -- 0.1 -- 4.0 --
Off-state output current Input current Quiescent supply current
I OZ Iin I CC
6.0 6.0 6.0
6
HD74HC646/HD74HC648
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25C Item Maximum clock frequency Symbol f max Ta = -40 to +85C Max 4 21 25 215 43 37 190 38 33 275 55 47 215 43 37 215 43 37 190 38 33 190 38 33 -- -- -- -- -- -- ns ns ns Control G input to A or B output ns Control G input or Direction to A or B output ns Select BA or Select AB input to A or B output, with A or B low ns Select BA or Select AB input to A or B output, with A or B high ns Clock BA or Clock AB input to A or B output ns A or B input to B or A output (HD74HC648 only) ns A or B input to B or A output (HD74HC646 only) Unit ns Test Conditions Clock AB to B or Clock BA to A
VCC (V) Min Typ Max Min 2.0 4.5 6.0 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 14 -- -- 14 -- -- 18 -- -- 15 -- -- 16 -- -- 17 -- -- 20 -- 5 27 32 -- -- --
Propagation delay t PLH time t PHL
2.0 4.5 6.0
170 -- 34 29 -- --
t PLH t PHL
2.0 4.5 6.0
150 -- 30 26 -- --
t PLH t PHL
2.0 4.5 6.0
220 -- 44 37 -- --
t PLH t PHL
2.0 4.5 6.0
170 -- 34 29 -- --
t PLH t PHL
2.0 4.5 6.0
170 -- 34 29 -- --
Output enable time
t ZH t ZL
2.0 4.5 6.0
150 -- 30 26 -- --
Output disable time
t LZ t HZ
2.0 4.5 6.0
150 -- 30 26 -- -- -- -- -- -- -- -- 125 25 21 5 5 5
Setup time
t su
2.0 4.5 6.0
100 -- 20 17 5 5 5 3 -- -- 0 --
Hold time
th
2.0 4.5 6.0
7
HD74HC646/HD74HC648
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns) (cont)
Ta = 25C Item Pulse width Symbol tw Ta = -40 to +85C Max -- -- -- 75 15 13 10 pF ns Unit ns Test Conditions
VCC (V) Min Typ Max Min 2.0 4.5 6.0 80 16 14 -- -- -- -- -- 5 -- -- 4 -- 5 -- -- -- 60 12 10 10 100 20 17 -- -- -- --
Output rise/fall time
t TLH t THL
2.0 4.5 6.0
Input capacitance
Cin
--
8
Unit: mm
24 31.6 32.5 Max 13
1
2.13 Max
1.2
12 5.70 Max
15.0 Max
13.4
15.24
0.51 Min
2.54 Min
2.54 0.25
0.48 0.10
0.25 - 0.05 0 - 15
+ 0.11
Hitachi Code JEDEC EIAJ Weight (reference value)
DP-24 Conforms Conforms 3.1 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.

▲Up To Search▲

Price & Availability of HD74HC646

	To Download HD74HC646 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .