INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT126
Quad buffer/line driver; 3-state
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
74HC/HCT126
FEATURES
• Output capability: bus driver
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT126 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL).
They are specified in compliance with JEDEC standard no. 7A.
The HC/HCT126 are four non-inverting buffer/line drivers with 3-state outputs. The 3-state outputs (nY) are controlled by
the output enable input (nOE). A LOW at nOE causes the outputs to assume a HIGH impedance OFF-state.
The “126” is identical to the “125” but has active HIGH enable inputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
HC
tPHL/ tPLH
propagation delay nA to nY
CI
input capacitance
CPD
power dissipation capacitance per buffer
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
CL = output load capacitance in pF
VCC = supply voltage in V
∑ (CL × VCC2 × fo) = sum of outputs
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2
HCT
9
11
ns
3.5
3.5
pF
23
24
pF
Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
74HC/HCT126
PIN DESCRIPTION
PIN NO.
SYMBOL
NAME AND FUNCTION
1, 4, 10, 13
1OE to 4OE
output enable inputs (active HIGH)
2, 5, 9, 12
1A to 4A
data inputs
3, 6, 8, 11
1Y to 4Y
data outputs
7
GND
ground (0 V)
14
VCC
positive supply voltage
(b)
(a)
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
FUNCTION TABLE
INPUTS
OUTPUT
nOE
nA
nY
H
H
L
L
H
X
L
H
Z
Note
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
Fig.4 Functional diagram.
December 1990
Fig.5 Logic diagram (one buffer).
3
Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
74HC/HCT126
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HC
SYMBOL PARAMETER
−40 to +85
+25
min.
tPHL/ tPLH
tPZH/ tPZL
tPHZ/ tPLZ
tTHL/ tTLH
propagation delay
nA to nY
typ.
max.
min.
max.
−40 to +125
min.
UNIT
VCC WAVEFORMS
(V)
max.
30
100
125
150
11
20
25
30
ns
2.0
4.5
9
17
21
26
3-state output
enable time
nOE to nY
41
125
155
190
15
25
31
38
4.5
12
21
26
32
6.0
3-state output
disable time
nOE to nY
41
125
155
190
15
25
31
38
4.5
12
21
26
32
6.0
output transition
time
14
60
75
90
5
12
15
18
4.5
4
10
13
15
6.0
December 1990
4
Fig.6
6.0
ns
ns
ns
2.0
2.0
2.0
Fig.7
Fig.7
Fig.6
Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
74HC/HCT126
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per unit, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
nA, nOE
1.00
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HCT
SYMBOL PARAMETER
−40 to +85
+25
min.
typ.
max.
min.
max.
−40 to +125
min.
UNIT
VCC WAVEFORMS
(V)
max.
tPHL/ tPLH
propagation delay
nA to nY
14
24
30
36
ns
4.5
Fig.6
tPZH/ tPZL
3-state output
enable time
nOE to nY
13
25
31
38
ns
4.5
Fig.7
tPHZ/ tPLZ
3-state output
disable time
nOE to nY
18
28
35
42
ns
4.5
Fig.7
tTHL/ tTLH
output transition
time
5
12
15
18
ns
4.5
Fig.6
December 1990
5
Philips Semiconductors
Product specification
Quad buffer/line driver; 3-state
74HC/HCT126
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.6 Waveforms showing the input (nA) to output (nY) propagation delays and the output transition times.
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.7 Waveforms showing the 3-state enable and disable times.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
6
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