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TECHNICAL DATA
IN74VHCT125
Quad 3-State Noninverting Buffers
IN74VHCT125 is high-speed logic IC made by CMOS
technology and designed for use in high-performance
calculating systems with a wide supply voltage range.
As for operation speed, IN74VHCT125 can be compared
with equivalent bipolar ICs based on Schottky TTL and two
times surpasses ICs of IN74 series.
IN74VHCT125 tolerates operation under conditions when
voltage on input & output is exceeded up to 7V without
affecting characteristics and IC reliability. This possibility
allows to use IN74VHCT125 in radio-electronic devices for
interfacing with supply voltages 5V and 3V, eliminate IC
failure under supply voltage source emergency outage.
Use of output edge shaping block in the microcircuit
allows to reduce noise amplitude of noises when switching
outputs into the same state simultaneously.
Input levels of IN74VHCT125 are compatible with TTL level
and output levels with CMOS levels.
ORDERING INFORMATION
IN74VHCT125N Plastic
IN74VHCT125D SOIC
T
A
= -40
to 85 C for all
packages



Features:
Supply voltage range 4.5 to 5.5 V.
Output current 8 mA.
Low consumption current: 0.2 mkA (typical value) at = 25
.
Latchup current not less than 300 mA at = 85
.
Tolerable value of static potential not less than 2000 V as per human body model
(HBM) and not less than 200 V as per machine model ().
Ambient operation temperature minus 40 to plus 85
.
Balanced signal propagation delay.
Ensures voltage exceeding mode on input
Low noise level at the simultaneous switching of outputs in the same state:
V
OLP
= 0.8 V (max).
For pins and functions, compatible with IN74HCT125.
.
1
IN74VHCT125

IN74VHCT125 truth table
Input Output
G A Y
H X Z
L L L
L H H
Note - H - high voltage level;
L - low voltage level;
X - any voltage level (low or high);
Z - output in the third
Pinout
G1
01
02
03
04
05
06
07
14
13
12
11
10
09
08
Y3
V
CC
A1
Y1
G2
A2
Y2
GND
A3
G3
Y4
A4
G4
Pins description in IN74VHCT125
Pin No.
Symbol
Description
01
G1
Input ENABLE OUTPUT
02 A1
Input
03 Y1
Output
04
G2
Input ENABLE OUTPUT
05 A2
Input
06 Y2
Output
07 GND
Common
output
08 Y3
Output
09 A3
Input
10
G3
Input ENABLE OUTPUT
11 Y4
Output
12 A4
Input
13
G4
Input ENABLE OUTPUT
14
VCC
Supply output from voltage source
2
IN74VHCT125




Absolute maximum conditions*

Parameter, unit
Symbol
Value
min
max
Supply voltage, V
V
CC
-0.5 7.0
Input voltage, V
Vin
-0.5
7.0
Output voltage, V
Vout
-0.5 V
CC
+ 0.5B
Output voltage, V
Vout1
-0.5
7.0
Input diode current, mA
Iik
-
-20
Current of common output and supply
output, mA
Icc
50
Output current, mA
Iout
25
Output diode current, mA
Iok
20
Dissipated power, mW
Pd
180

*Under absolute maximum conditions operation of microcircuit is not guaranteed. Operation is
guaranteed under maximum conditions




Maximum conditions
Symbol Value
Parameter, unit
min
max
Supply voltage, V
V
CC
4.5 5.5
Input voltage,V
Vin
0
V
CC
Output voltage, V
Vout
0
V
CC
Output voltage, V
Vout1
0
5.5*
Output current, mA
Iout
-
8.0
Input rise and fall time, ns/V
t
LH
, t
HL
0 20
* Outputs in the third state
3
IN74VHCT125




DC electrical characteristics
Value
25
C
-40
to 85
C
Symbo
l
Parameter Test
conditions
V
CC
,
V
min max
min max
Unit
V
IH
High input voltage
-
4.5 -
5.5
2.0
- 2.0
- V
V
IL
Low input voltage
-
4.5 -
5.5
- 0.8
- 0.8
4.5 4.42
- 4.4 -
V
I
= V
IH
or V
IL
I
O
= -50 mkA
5.5 5.42
- 5.4 -
V
OH
High output voltage
V
I
= V
IH
or V
IL
;
I
O
= -8 mA
4.5 3.94
- 3.80 -
4.5 - 0.09
- 0.1
V
I
= V
IH
or V
IL
I
O
= 50 mkA
5.5 - 0.09
- 0.1
V
OL
Low output voltage
V
I
= V
IH
or V
IL
I
O
= 8 mA
4.5 - 0.36
- 0.44
I
OZ
Output current in
"off" state
V
I
= 2.0V
V
O
= V
CC
or 0V
5.5 -
0.25
-
2.5
mkA
I
I
Input current
V
I
= 0 V or V
CC
5.5
0.1
1.0
I
IH1
High level input
current
V
I
= 5.5V
0
-
0.1
-
1.0
uA
I
CC
Consumption current V
I
=V
CC
or 0V
5.5
-
4.0
-
40.0
I
CCT
TTL-input
consumption current
V
I
= 3.4 V
5.5
-
1.35
-
1.5
mA
4
IN74VHCT125

AC electrical characteristics
(t
LH
= t
HL
= 3.0 ns)
Value
25
C
-40
to 85
C
Symbol Parameter
Test conditions
V
CC
, V
C
L
,
pF
min
max min max
Unit
15
- 5.5 - 6.5
t
PHL
,
t
PLH
Propagation delay time
when switching "on",
"off"
Fig 1
5.0 0.5
50
- 7.5 - 8.5
ns
t
PHZ
, t
PLZ
Propagation delay time
under transition from
high , low level into "off"
state
Fig 2
5.0 0.5 50
- 8.8 - 10.0
ns
15
- 5.1 - 6.0
t
PZH
, t
PZL
Propagation delay time
under transition from
off state into high, low
level
Fig 2
5.0 0.5
50
- 7.1 - 8.0
ns
t
OSLH
,
t
OSHL
Propagation delays
difference between
outputs
-
5.0 0.5 50
- 1.0 - 1.0 ns


Capacitance characteristics
Value
25
C
Symbol Parameter
Test conditions
V
CC
, V
min max
Unit
C
I
Input capacity
-
5.0
10
pF
C
O
Output capacity
-
5.0
12
pF
C
D
Dynamic capacity
V
I
= 0 V orV
CC
5.0 28 pF


Noise characteristics (C
L
= 50 pF)
Value
Symbol
Parameter
V
CC
, V
min max
Unit
V
OLP
Positive noise of low output voltage
5.0
-
0.8
V
V
OLV
Negative noise of low output
voltage
5.0 -0.8 -
V
IHD
Input dynamic high voltage
5.0
2.0
V
ILD
Input dynamic low voltage
5.0
0.8

5