TECHNICAL DATA
IN74VHC126
Q
UAD
3-S
TATE
N
ONINVERTING
B
UFFERS
IN74VHC126 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, IN74VHC126 can be compared
with equivalent bipolar ICs based on Schottky TTL and two
times surpasses ICs of IN74 series.
IN74VHC126 tolerates operation under conditions when
voltage on input is exceeded up to 7V without affecting
characteristics and IC reliability. This possibility allows to
use IN74VHC126 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 and output levels of IN74VHC126 are compatible with
CMOS levels
ORDERING INFORMATION
IN74VHC126N Plastic
IN74VHC126D SOIC
T
A
= -40
to 85 C for all
packages
Features :
Supply voltage range 2.0 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 IN74HC126.
.
1
IN74VHC126
IN74VHC126 truth table
Input Output
G A Y
L X Z
H L L
H 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 IN74VHC126
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
IN74VHC126
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
Vcc+0.5V
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
2.0 5.5
Input voltage,V
Vin
0
V
CC
Output voltage, V
Vout
0
V
CC
Output current, mA
Iout
-
8.0
Input rise and fall time, ns/V
at Vcc = (3.3 0.3) V
at Vcc = (5.0 0.5) V
t
LH
, t
HL
0
0
100
20
3
IN74VHC126
AC electrical characteristics (t
LH
= t
HL
= 3.0 ns)
Value
25
C
-40
to 85
C
Symbol Parameter
Test
conditi
ons
V
CC
, V
C
L
,
pF
min max min max
Unit
15
- 8.0
- 9.5
3.3 0.3
50
11.5
13.0
15
5.5
6.5
t
PHL
,
t
PLH
Propagation delay time
when switching "on",
"off"
Figure
1
5.0 0.5
50
7.5
8.5
ns
3.3 0.3
50
-
13.2
-
15.0
t
PHZ
, t
PLZ
Propagation delay time
under transition from
high , low level into "off"
state
Figure
2
5.0 0.5
50
-
8.8
-
10.0
15
- 8.0
- 9.5
3.3 0.3
50
- 11.5
- 13.0
15
- 5.1
- 6.0
t
PZH
, t
PZL
Propagation delay time
under transition from
off state into high, low
level
Figure
2
5.0 0.5
50
- 7.1
- 8.0
-
3.3 0.3
50
-
1.5
-
1.5
t
OSLH
, t
OSHL
Propagation delays
difference between
outputs
5.5 0.5
50
-
1.0
-
1.0
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 30 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
3.5
-
V
ILD
Input dynamic low voltage
5.0
-
1.5
5
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