HD74BC645AT [ETC]
BUS TRANSCEIVER|SINGLE|8-BIT|BICMOS-TTL|TSSOP|20PIN|PLASTIC ; 总线收发器|单| 8位| BICMOS - TTL | TSSOP封装| 20PIN |塑料\n
| 型号： | HD74BC645AT |
| 厂家： | 
ETC |
| 描述： | BUS TRANSCEIVER|SINGLE|8-BIT|BICMOS-TTL|TSSOP|20PIN|PLASTIC
|
| 文件： | 总9页 (文件大小：43K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HD74BC645A
Octal Bus Transceivers With 3 State Outputs
ADE-205-027 (Z)
Rev.0
June 1993
Description
The HD74BC645A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC. When the frequency is 10 MHz. The device has eight bus transceivers with
three state outputs in a 20 pin package. Each device has an active low enable input (G) and a direction
control input, DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is high,
data flows from the B inputs to the A outputs. When enable inputs (G) is high, disables both A and B ports
by placing then in a high impedance.
Features
•
•
•
•
Input/Output are at high impedance state when power supply is off.
Input pins can be open, when not used, owing to built in input pull up circuit.
Input is TTL level.
Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Control Inputs
G
L
DIR
L
Operation
B data to A bus
A data to B bus
Z
L
H
H
X
H :
High level
L
X
Z
:
:
:
Low level
Immaterial
High impedance
HD74BC645A
Pin Arrangement
20
19
18
17
16
15
14
13
12
11
VCC
G
1
2
DIR
A1
A2
3
B1
B2
B3
B4
A3
4
A4
5
A5
6
A6
7
B5
B6
A7
8
9
A8
B7
B8
GND
10
(Top view)
Absolute Maximum Ratings
Item
Symbol
VCC
Rating
Unit
V
Supply voltage
Input diode current
Input voltage
–0.5 to +7.0
±30
IIK
mA
V
VIN
–0.5 to +7.5
–0.5 to +7.5
–0.5 to +5.5
–65 to +150
Output voltage
Off state output voltage
Storage temperature
VOUT
VOUT(off)
Tstg
V
V
°C
Note: 1. The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
2
HD74BC645A
Recommended Operating Conditions
Item
Symbol
VCC
Min
4.5
0
Typ
5.0
—
Max
5.5
VCC
VCC
85
Unit
V
Supply voltage
Input voltage
VIN
V
Ouput voltage
Operating temperature
Input rise/fall time*1
VOUT
Topr
tr, tf
0
—
V
–40
0
—
°C
ns/V
—
8
Note: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Logic Diagram
DiR
G
A1
A2
A3
A4
A5
A6
A7
B1
B2
B3
B4
B5
B6
B7
A8
B8
3
HD74BC645A
Electrical Characteristics (Ta = –40 to +85°C)
Item
Symbol
VIH
VCC (V)
Min
2.0
—
Max
—
Unit
V
Test Conditions
Input voltage
VIL
0.8
V
Output voltage
VOH
4.5
4.5
4.5
4.5
4.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
5.5
2.4
2.0
—
—
V
IOH = –3 mA
—
V
IOH = –15 mA
VOL
0.5
V
IOL = 48 mA
—
0.55
–1.2
–250
100
1.0
V
IOL = 64 mA
Input diode voltage
Input current
VIK
II
—
V
IIN = –18 mA
—
µA
µA
µA
µA
mA
µA
µA
mA
VIN = 0 V
—
An or Bn, VIN = 5.5 V
DiR or G, VIN = 5.5 V
DiR or G, VIN = 7 V
VO = 0 V, VIN = 0 or 5.5 V
VO = 2.7 V
—
—
100
–225
–100
–250
31.5
Output short circuit current*1
Off state output current
IOS
–100
—
IOZH
IOZL
ICCL
—
VO = 0.5 V
Supply current
—
VIN = 0 or 5.5 V
All outputs is “L”
ICCH
5.5
5.5
5.5
—
—
—
0.5
4.5
1.5
mA
mA
mA
VIN = 0 or 5.5 V
All outputs is “H”
ICCZ
VIN = 0 or 5.5 V
All outputs is “Z”
2
ICCT
*
VIN = 3.4 or 0.5 V
Notes: 1. Not more than one output should be shorted at a time and duration of the short circuit should not
exceed one second.
2. When input by the TTL level, it shows ICC increase at per one input pin.
4
HD74BC645A
Switching Characteristics (CL = 50 pF)
Ta = 25°C
Ta = –40 to +85°C
VCC = 5.0 V ±10%
V
CC = 5.0 V
Item
Symbol Min
Max
6.0
6.0
6.0
6.0
9.0
9.0
9.0
9.0
8.0
8.0
8.0
8.0
Min
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
3.0
—
Max
7.0
Unit Test Conditions
Propagation delay time
tPLH
tPHL
tPLH
tPHL
tZH
3.0
ns
ns
ns
ns
ns
ns
An to Bn
Bn to An
G to Bn
G to An
G to Bn
G to An
3.0
7.0
3.0
7.0
3.0
7.0
Output enable time
Output disable time
3.0
11.0
11.0
11.0
11.0
10.0
10.0
10.0
10.0
tZL
3.0
tZH
3.0
tZL
3.0
tHZ
3.0
tLZ
3.0
tHZ
3.0
tLZ
3.0
Input capacitance
Output capacitance
CIN
CI/O
3.0 (Typ)
15.0 (Typ)
pF
pF
VIN = VCC or GND
VI/O = VCC or GND
—
5
HD74BC645A
Test Circuit
VCC
VCC
G
Output
Input
S1
A1
B1
OPEN *4
7V
500 Ω
450 Ω
Pulse
Generator
Zout = 50 Ω
CL=
50 Ω
Scope
50 pF
DIR
Notes:
1. CL includes probe and jig capacitance.
2. A2-B2 to A8-B8 are identical to above load circuit.
3. S1: Input-Output change switch.
4. Open: tPLH, tPHL, tZH tHZ
7 V: tZL, tLZ
Waveforms-1
tr
tf
3 V
0 V
90 %
1.5 V
90 %
1.5 V
Input
10 %
10 %
tPHL
tPLH
VOH
1.5 V
1.5 V
Output
VOL
6
HD74BC645A
Waveforms-2
tf
tr
3 V
90 %
1.5 V
10 %
90 %
1.5 V
10 %
G
0 V
tZL
tLZ
3.5 V
Waveform – A
1.5 V
tZH
VOL + 0.3 V
VOL
VOH
tHZ
VOH– 0.3 V
1.5 V
Waveform – B
0 V
Notes: 1. tr = 2.5 ns, tf = 2.5 ns
2. Input waveforms: PRR = 1 MHz, duty cycle 50%
3. Waveform-A shows input conditions such that the output is “L” level when enable by the output
control.
4. Waveform-B shows input conditions such that the output is “H” level when enable by the output
control.
7
HD74BC645A
Package Dimensions
Unit: mm
8
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 fail-
safes, 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
Europe
: http:semiconductor.hitachi.com/
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Asia (Singapore)
Asia (Taiwan)
: http://www.has.hitachi.com.sg/grp3/sicd/index.htm
: 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.
Hitachi Europe GmbH
Hitachi Asia (Hong Kong) Ltd.
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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
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Hitachi Tower
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Tel: 535-2100
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Germany
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Electronic Components Group.
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Berkshire SL6 8YA, United Kingdom
Tel: <44> (1628) 585000
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
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