HD74LVC125A
Quad. Bus Buffer Gates with 3-state Outputs
ADE-205-108B(Z)
3rd Edition
December 1996
Description
The HD74LVC125A has four bus buffer gates in a 14 pin package. The device require the three state
control input C to be taken high to put the output into the high impedance condition, whereas the device
requires the control input to be low to put the output into high impedance. 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
C
A
Outputs Y
H
X
Z
L
L
L
L
H
H
H :
High level
L :
Low level
X :
Immaterial
Z :
High impedance
HD74LVC125A
2
Pin Arrangement
(Top view)
11
12
13
14 V
CC
4C
4A
4Y
3C
3A
1
2
3
4
5
6
7
8
9
10
1C
GND
3Y
1A
1Y
2C
2A
2Y
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.
HD74LVC125A
3
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
C, A
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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