HD74AC245FP-EL [HITACHI]
Bus Transceiver, AC Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, FP-20DA;
| 型号： | HD74AC245FP-EL |
| 厂家： | 
HITACHI SEMICONDUCTOR |
| 描述： | Bus Transceiver, AC Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, FP-20DA |
| 文件： | 总9页 (文件大小：61K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
HD74AC245/HD74ACT245
Octal Bidirectional Transceiver with 3-State Input/Output
Description
The HD74AC245/HD74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and
is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports.
The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional
transceiver. Transmit (active-High) enables data from A ports to B ports; Receive (active-Low) enables
data from B ports to A ports. The Output Enable input, when High, disables, both A and B ports by placing
them in a High Z condition.
Features
•
•
•
•
Noninverting Buffers
Bidirectional Data Path
A and B Outputs Source/Sink 24 mA
HD74ACT245 has TTL-Compatible Inputs
Pin Names
OE
Output Enable Input
T/R
Transmit/Receive Input
A0 to A7 Side A 3-State Inputs or 3-State Outputs
B0 to B7 Side B 3-State Inputs or 3-State Outputs
HD74AC245/HD74ACT245
Pin Arrangement
1
2
3
T/R
A0
20 VCC
OE
19
18
A1
B0
A2 4
17 B1
16 B2
15 B3
14 B4
13 B5
A3
A4
5
6
A5 7
A6
8
A7 9
12
11
B6
B7
GND 10
(Top view)
Truth Tables
Inputs
OE
L
T/R
Outputs
L
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
L
H
X
H
H :
High Voltage Level
L
:
:
Low Voltage Level
Immaterial
X
2
HD74AC245/HD74ACT245
DC Characteristics (unless otherwise specified)
Item
Symbol Max
Unit
Condition
Maximum quiescent supply current
ICC
ICC
ICCT
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
8.0
1.5
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
Maximum additional ICC/input
(HD74ACT245)
mA
VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC245
Ta = +25°C
Ta = –40°C to +85°C
CL = 50 pF
CL = 50 pF
Item
Symbol VCC (V)*1
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Typ
Max
8.5
Min
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Max
9.0
Unit
Propagation delay
Data to output
Propagation delay
Data to output
Output enable time
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
5.0
3.5
5.0
3.5
7.0
5.0
7.5
5.5
6.5
5.5
7.0
5.5
ns
6.5
7.0
8.5
9.0
ns
ns
ns
ns
ns
6.0
7.0
11.5
8.5
12.5
9.0
Output enable time
Output disable time
Output disable time
12.0
9.0
13.5
9.5
12.0
9.0
12.5
10.0
13.0
10.0
11.5
9.0
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
3
HD74AC245/HD74ACT245
AC Characteristics: HD74ACT245
Ta = +25°C
Ta = –40°C to +85°C
CL = 50 pF
CL = 50 pF
Item
Symbol VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
Data to output
tPLH
5.0
1.0
4.0
7.5
1.0
8.0
ns
Propagation delay
Data to output
tPHL
5.0
1.0
4.0
8.0
1.0
9.0
ns
Output enable time
Output enable time
Output disable time
Output disable time
tPZH
tPZL
tPHZ
tPLZ
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
5.0
5.5
5.5
5.0
10.0
10.0
10.0
10.0
1.0
1.0
1.0
1.0
11.0
12.0
11.0
11.0
ns
ns
ns
ns
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
CIN
Typ
Unit
Condition
VCC = 5.5 V
VCC = 5.5 V
VCC = 5.0 V
Input capacitance
Input/output capacitance
Power dissipation capacitance
4.5
pF
pF
pF
CI/O
15.0
45.0
CPD
4
Unit: mm
24.50
25.40 Max
20
11
10
1
1.30
0.89
7.62
1.27 Max
+ 0.11
– 0.05
0.25
2.54 ± 0.25
0.48 ± 0.10
0° – 15°
Hitachi Code
JEDEC
EIAJ
DP-20N
—
Conforms
Weight (reference value) 1.26 g
Unit: mm
12.6
13 Max
11
10
20
1
+ 0.20
7.80
– 0.30
0.80 Max
1.15
0° – 8°
1.27
0.70 ± 0.20
*0.42 ± 0.08
0.40 ± 0.06
0.15
0.12 M
Hitachi Code
JEDEC
FP-20DA
—
EIAJ
Conforms
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.31 g
Unit: mm
12.8
13.2 Max
11
10
20
1
+ 0.25
– 0.40
10.40
0.935 Max
1.45
0° – 8°
+ 0.57
– 0.30
1.27
0.70
*0.42 ± 0.08
0.40 ± 0.06
0.15
M
0.12
Hitachi Code
JEDEC
EIAJ
FP-20DB
Conforms
—
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.52 g
Unit: mm
6.50
6.80 Max
20
11
1
10
0.65
1.0
+0.08
*0.22
0.20 ± 0.06
–0.07
0.13
M
6.40 ± 0.20
0.65 Max
0° – 8°
0.50 ± 0.10
0.10
Hitachi Code
TTP-20DA
JEDEC
EIAJ
—
—
*Dimension including the plating thickness
Base material dimension
Weight (reference value) 0.07 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 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.
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Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109
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For further information write to:
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(America) Inc.
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Copyright ' Hitachi, Ltd., 1999. All rights reserved. Printed in Japan.
相关型号：
HD74AC245RP-EL
Bus Transceiver, AC Series, 1-Func, 8-Bit, True Output, CMOS, PDSO20, FP-20DB
HITACHI
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