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
V
CC
= 2.0 V to 5.5 V
All inputs V
IH
(Max.) = 5.5 V (@V
CC
= 0 V to 5.5 V)
All outputs V
OUT
(Max.) = 5.5 V (@V
CC
= 0 V or output off state)
Typical V
OL
ground bounce < 0.8 V (@V
CC
= 3.3 V, Ta = 25C)
Typical V
OH
undershoot > 2.0 V (@V
CC
= 3.3 V, Ta = 25C)
High output current 24 mA (@V
CC
= 3.0 V to 5.5 V)
Function Table
Inputs
G
LE
D
Output Q
H
X
X
Z
L
H
L
L
L
H
H
H
L
L
X
Q
0
H :
High level
L :
Low level
X :
Immaterial
Z :
High impedance
Q
0
:
Level of Q before the indicated steady input conditions were established.
HD74LVC373A
3
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Conditions
Supply voltage
V
CC
0.5 to 6.0
V
Input diode current
I
IK
50
mA
V
I
= 0.5 V
Input voltage
V
I
0.5 to 6.0
V
Output diode current
I
OK
50
mA
V
O
= 0.5 V
50
mA
V
O
= V
CC
+0.5 V
Output voltage
V
O
0.5 to V
CC
+0.5
V
Output "H" or "L"
0.5 to 6.0
V
Output "Z" or V
CC
:OFF
Output current
I
O
50
mA
V
CC
, GND current / pin
I
CC
or I
GND
100
mA
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
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
0 to 5.5
V
G
, LE, D
V
O
0 to V
CC
V
Output "H" or "L"
0 to 5.5
V
Output "Z" or V
CC
:OFF
Operating temperature
Ta
40 to 85
C
Output current
I
OH
12
mA
V
CC
= 2.7 V
24
*2
mA
V
CC
= 3.0 V to 5.5 V
I
OL
12
mA
V
CC
= 2.7 V
24
*2
mA
V
CC
= 3.0 V to 5.5 V
Input rise / fall time
*1
t
r
, t
f
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%
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