ETC HD74AC245/HD74ACT245

HD74AC245/HD74ACT245
Octal Bi-directional Transceiver with 3-State Input/Output
ADE-205-384 (Z)
1st. Edition
Sep. 2000
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
Bi-directional Data Path
A and B Outputs Source/Sink 24 mA
HD74ACT245 has TTL-Compatible Inputs
Pin Names
OE
T/R
A0 to A7
B 0 to B7
Output Enable Input
Transmit/Receive Input
Side A 3-State Inputs or 3-State Outputs
Side B 3-State Inputs or 3-State Outputs
HD74AC245/HD74ACT245
Pin Arrangement
T/R 1
20 VCC
A0 2
19 OE
A1 3
18 B0
A2 4
17 B1
A3 5
16 B2
A4 6
15 B3
A5 7
14 B4
A6 8
13 B5
A7 9
12 B6
GND 10
11 B7
(Top view)
Truth Tables
Inputs
OE
T/R
Outputs
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State
H :
L :
X :
2
High Voltage Level
Low Voltage Level
Immaterial
HD74AC245/HD74ACT245
DC Characteristics (unless otherwise specified)
Item
Symbol
Max
Unit
Condition
Maximum quiescent supply current
I CC
80
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = Worst case
Maximum quiescent supply current
I CC
8.0
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
Maximum additional ICC/input
(HD74ACT245)
I CCT
1.5
mA
VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC245
Ta = +25°C
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t PLH
3.3
1.0
5.0
8.5
1.0
9.0
ns
5.0
1.0
3.5
6.5
1.0
7.0
3.3
1.0
5.0
8.5
1.0
9.0
5.0
1.0
3.5
6.0
1.0
7.0
3.3
1.0
7.0
11.5
1.0
12.5
5.0
1.0
5.0
8.5
1.0
9.0
3.3
1.0
7.5
12.0
1.0
13.5
5.0
1.0
5.5
9.0
1.0
9.5
3.3
1.0
6.5
12.0
1.0
12.5
5.0
1.0
5.5
9.0
1.0
10.0
3.3
1.0
7.0
11.5
1.0
13.0
5.0
1.0
5.5
9.0
1.0
10.0
Data to output
Propagation delay
t PHL
Data to output
Output enable time
Output enable time
Output disable time
Output disable time
Note:
t ZH
t ZL
t HZ
t LZ
ns
ns
ns
ns
ns
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
CL = 50 pF
Ta = –40°C to +85°C
CL = 50 pF
Item
Symbol
VCC (V)*1
Min
Typ
Max
Min
Max
Unit
Propagation delay
Data to output
t PLH
5.0
1.0
4.0
7.5
1.0
8.0
ns
Propagation delay
Data to output
t PHL
5.0
1.0
4.0
8.0
1.0
9.0
ns
Output enable time
t ZH
5.0
1.0
5.0
10.0
1.0
11.0
ns
Output enable time
t ZL
5.0
1.0
5.5
10.0
1.0
12.0
ns
Output disable time
t HZ
5.0
1.0
5.5
10.0
1.0
11.0
ns
Output disable time
t LZ
5.0
1.0
5.0
10.0
1.0
11.0
ns
Note:
1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
CIN
4.5
pF
VCC = 5.5 V
Input/output capacitance
CI/O
15.0
pF
VCC = 5.5 V
Power dissipation capacitance
CPD
45.0
pF
VCC = 5.0 V
4
HD74AC245/HD74ACT245
Package Dimensions
Unit: mm
24.50
25.40 Max
1
7.00 Max
11
6.30
20
10
1.30
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
1.27 Max
7.62
2.54 Min 5.08 Max
0.89
+ 0.11
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
DP-20N
—
Conforms
1.26 g
Unit: mm
12.6
13 Max
11
1
10
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.10 ± 0.10
0.80 Max
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
5.5
20
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-20DA
—
Conforms
0.31 g
5
HD74AC245/HD74ACT245
Unit: mm
12.8
13.2 Max
11
1
10
0.20 ± 0.10
0.935 Max
*0.27 ± 0.05
0.25 ± 0.04
2.65 Max
7.50
20
1.27
*0.42 ± 0.08
0.40 ± 0.06
0.25
10.40 +– 0.40
1.45
0° – 8°
0.57
0.70 +– 0.30
0.15
0.12 M
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
*Dimension including the plating thickness
Base material dimension
FP-20DB
Conforms
—
0.52 g
Unit: mm
6.50
6.80 Max
11
1
10
4.40
20
0.65
*0.22+0.08
–0.07
0.20 ± 0.06
1.0
0.13 M
6.40 ± 0.20
*Dimension including the plating thickness
Base material dimension
6
0.07 +0.03
–0.04
0.10
*0.17 ± 0.05
0.15 ± 0.04
1.10 Max
0.65 Max
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
TTP-20DA
—
—
0.07 g
HD74AC245/HD74ACT245
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.
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products.
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Copyright  Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
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