HIT HD74LVC373A Datasheet
HD74LVC373A
Octal D-type Transparent Latches with 3-state Outputs
ADE-205-112B(Z)
3rd Edition
December 1996
Description
The HD74LVC373A has eight D type latches with three state outputs in a 20 pin package. When the latch
enable input is high, the Q outputs will follow the D inputs. When the latch enable goes low, data at the D
inputs will be retained at the outputs until latch enable returns high again. When a high logic level is
applied to the output control input, all outputs go to a high impedance state, regardless of what signals are
present at the other inputs and the state of the storage elements. Low voltage and high speed operation is
suitable at the battery drive product (note type personal computer) and low power consumption extends the
life of a battery for long time operation.
Features
• VCC = 2.0 V to 5.5 V
• All inputs V
• All outputs V
• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
• High output current ±24 mA (@VCC = 3.0 V to 5.5 V)
(Max.) = 5.5 V (@VCC = 0 V to 5.5 V)
IH
(Max.) = 5.5 V (@VCC = 0 V or output off state)
OUT
Function Table
Inputs
G LE D Output Q
HXXZ
LHLL
LHHH
LLXQ
H : High level
L : Low level
X : Immaterial
Z : High impedance
Q
: Level of Q before the indicated steady input conditions were established.
0
0
HD74LVC373A
Pin Arrangement
V
1
G
20
CC
1Q
1D
2D
2Q
3Q
3D
4D
4Q
GND
10
2
3
4
5
6
7
8
9
Q
G
D
D
G
Q
Q
G
D
D
G
Q
Q
G
D
D
G
Q
Q
G
D
D
G
Q
19
18
17
16
15
14
13
12
11
8Q
8D
7D
7Q
6Q
6D
5D
5Q
LE
(Top view)
2
HD74LVC373A
Absolute Maximum Ratings
Item Symbol Ratings Unit Conditions
Supply voltage V
Input diode current I
Input voltage V
Output diode current I
Output voltage V
Output current I
VCC, GND current / pin ICC or I
CC
IK
I
OK
O
O
GND
Storage temperature Tstg –65 to +150 °C
Note: 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.
Recommended Operating Conditions
–0.5 to 6.0 V
–50 mA VI = –0.5 V
–0.5 to 6.0 V
–50 mA VO = –0.5 V
50 mA VO = VCC+0.5 V
–0.5 to VCC +0.5 V Output "H" or "L"
–0.5 to 6.0 V Output "Z" or VCC:OFF
±50 mA
100 mA
Item Symbol Ratings Unit Conditions
Supply voltage V
CC
1.5 to 5.5 V Data hold
2.0 to 5.5 V At operation
Input / output voltage V
I
V
O
0 to 5.5 V G, LE, D
0 to V
CC
V Output "H" or "L"
0 to 5.5 V Output "Z" or VCC:OFF
Operating temperature Ta –40 to 85 °C
Output current I
Input rise / fall time
*1
OH
I
OL
tr, t
f
–12 mA VCC = 2.7 V
*2
–24
mA VCC = 3.0 V to 5.5 V
12 mA VCC = 2.7 V
*2
24
mA VCC = 3.0 V to 5.5 V
10 ns/V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform : Refer to test circuit of switching characteristics.
2. duty cycle ≤ 50%
3
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