HD74AC373/HD74ACT373 [ETC]
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| 型号： | HD74AC373/HD74ACT373 |
| 厂家： | 
ETC |
| 描述： |
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| 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 |
HD74AC373/HD74ACT373
Octal Transparent Latch with 3-State Output
ADE-205-394 (Z)
1st. Edition
Sep. 2000
Description Diagram
The HD74AC373/HD74ACT373 consists of eight latches with 3-state outputs from bus organized system
applications. The flip-flops appear transparent to the data when Latch Enable (LE) is High. When LE is
Low, the data that meets the setup time is latched. Data appears on the bus when the Output Enable (OE) is
Low. When OE is High, the bus output is in the high impedance state.
Features
•
•
•
•
Eight Latches in a Single Package
3-State Outputs for Bus Interfacing
Outputs Source/Sink 24 mA
HD74AC373 has TTL-Compatible Inputs
HD74AC373/HD74ACT373
Pin Arrangement
OE
1
2
20
19
18
VCC
O7
O0
D0
D1
3
D7
4
17 D6
O1
O2
5
O6
O5
D5
D4
O4
LE
16
15
14
13
12
11
6
7
D2
D3
O3
8
9
10
Gnd
(Top view)
Logic Symbol
D0 D1 D2 D3
D4 D5 D6 D7
LE
OE
O0 O1 O2 O3
O4 O5 O6 O7
Pin Names
D0 – D7 Data Inputs
LE
Latch Enable Input
Output Enable Input
OE
O0 – O7 3-State Latch Outputs
2
HD74AC373/HD74ACT373
Truth Table
Inputs
Outputs
OE
H
L
LE
X
Dn
X
On
Z
H
H
L
L
L
L
H
X
H
L
O0
H :
High Voltage Level
L
Z
X
:
:
:
Low Voltage Level
High Impedance
Immaterial
O0 :
Previous O0 before Low-to-High Transition of Clock
Functional Description
The HD74AC373/HD74ACT373 contains eight D-type latches with 3-state standard outputs. When the
Latch Enable (LE) input is High, data on the Dn inputs enters the latches. In this condition the latches are
transparent, i.e., a latch output will change state each time its D input changes. When LE is Low, the
latches store the information that was present on the D inputs setup time proceding the High-to-Low
transition of LE. The 3-state standard outputs are controlled by the Output Enable (OE) input. When OE is
Low, the standard outputs are in the 2-state mode. When OE is High, the standard outputs are in the high
impedance mode but this does not interfere with entering new data into the latches.
Logic Diagram
D0
D1
D2
D3
D4
D5
D6
D7
D
D
D
D
D
D
D
D
O
O
O
O
O
O
O
O
G
G
G
G
G
G
G
G
LE
OE
O0
O1
O2
O3
O4
O5
O6
O7
Please note that this diagram is provided only for the understanding of logic operations and should not be
used to estimate propagation delays.
3
HD74AC373/HD74ACT373
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
Maximum ICC/input (HD74ACT373)
8.0
1.5
µA
VIN = VCC or ground, VCC = 5.5 V,
Ta = 25°C
mA
VIN = VCC – 2.1 V, VCC = 5.5 V,
Ta = Worst case
AC Characteristics: HD74AC373
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
1.0
1.0
1.0
1.0
Typ
10.0
Max
13.5
9.5
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
1.0
1.0
1.0
1.0
Max
15.0
10.5
14.5
10.5
15.0
10.5
14.0
10.5
13.0
9.5
Unit
Propagation delay
Dn to On
tPLH
tPHL
tPLH
tPHL
tZH
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
3.3
5.0
ns
7.0
9.5
7.0
10.0
7.5
9.5
7.0
9.0
7.0
8.5
6.5
10.0
8.0
8.0
6.5
Propagation delay
Dn to On
13.0
9.5
ns
ns
ns
ns
ns
ns
ns
Propagation delay
LE to On
13.5
9.5
Propagation delay
LE to On
12.5
9.5
Output enable time
11.5
8.5
Output enable time
Output disable time
Output disable time
tZL
11.5
8.5
13.0
9.5
tHZ
12.5
11.0
11.5
8.5
14.5
12.5
12.5
10.0
tLZ
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
4
HD74AC373/HD74ACT373
AC Characteristics: HD74AC373
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
Dn to On
tPLH
tPHL
tPLH
tPHL
5.0
5.0
5.0
5.0
1.0
8.5
8.0
8.5
8.0
10.0
1.0
11.5
ns
Propagation delay
Dn to On
1.0
1.0
1.0
10.0
11.0
10.0
1.0
1.0
1.0
11.5
11.5
11.5
ns
ns
ns
Propagation delay
LE to On
Propagation delay
LE to On
Output enable time
Output enable time
Output disable time
Output disable time
tZH
tZL
tHZ
tLZ
5.0
5.0
5.0
5.0
1.0
1.0
1.0
1.0
8.0
7.5
9.0
7.5
9.5
9.0
11.0
8.5
1.0
1.0
1.0
1.0
10.5
10.5
12.5
10.0
ns
ns
ns
ns
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
AC Operating Requirements: HD74AC373
Ta = –40°C
to +85°C
Ta = +25°C
CL = 50 pF
CL = 50 pF
Item
Symbol VCC (V)*1 Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
Dn to LE
tsu
3.3
5.0
3.3
5.0
3.3
5.0
3.5
5.5
4.0
0.0
0.0
5.5
4.0
6.0
4.5
0.0
0.0
6.0
4.5
ns
ns
ns
2.0
Hold time, HIGH or LOW
Dn to LE
th
–3.0
–1.5
4.0
LE pulse width, HIGH
tw
2.0
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
5
HD74AC373/HD74ACT373
AC Operating Requirements: HD74ACT373
Ta = –40°C
to +85°C
CL = 50 pF
Ta = +25°C
CL = 50 pF
Item
Symbol VCC (V)*1 Typ
Guaranteed Minimum
Unit
Setup time, HIGH or LOW
Dn to LE
tsu
5.0
5.0
5.0
3.0
0.0
2.0
7.0
0.0
7.0
8.0
1.0
8.0
ns
Hold time, HIGH or LOW
Dn to LE
th
ns
ns
LE pulse width, HIGH
tw
Note: 1. Voltage Range 5.0 is 5.0 V ± 0.5 V
Capacitance
Item
Symbol
CIN
Typ
4.5
Unit
pF
Condition
VCC = 5.5 V
VCC = 5.0 V
Input capacitance
Power dissipation capacitance
CPD
40.0
pF
6
HD74AC373/HD74ACT373
Package Dimensions
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
DP-20N
—
EIAJ
Conforms
1.26 g
Mass (reference value)
Unit: mm
12.6
13 Max
11
20
1
10
+ 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
M
0.12
Hitachi Code
JEDEC
FP-20DA
—
EIAJ
Conforms
0.31 g
*Dimension including the plating thickness
Base material dimension
Mass (reference value)
7
HD74AC373/HD74ACT373
Unit: mm
12.8
13.2 Max
11
20
1
10
+ 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
Mass (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
JEDEC
TTP-20DA
—
EIAJ
—
0.07 g
*Dimension including the plating thickness
Base material dimension
Mass (reference value)
8
HD74AC373/HD74ACT373
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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Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan.
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9
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