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/HCT27
Triple 3-input NOR gate
Product specification
File under Integrated Circuits, IC06
December 1990
Philips Semiconductors
Product specification
Triple 3-input NOR gate
FEATURES
•
Output capability: standard
•
I
CC
category: SSI
GENERAL DESCRIPTION
74HC/HCT27
The 74HC/HCT27 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 74HC/HCT27 provide the 3-input NOR function.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
= 6 ns
TYPICAL
SYMBOL
t
PHL
/ t
PLH
C
I
C
PD
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
O
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
2. For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
−
1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
PARAMETER
propagation delay nA, nB, nC to nY
input capacitance
power dissipation capacitance per gate
notes 1 and 2
CONDITIONS
HC
C
L
= 15 pF; V
CC
= 5 V
8
3.5
24
HCT
10
3.5
30
ns
pF
pF
UNIT
December 1990
2
Philips Semiconductors
Product specification
Triple 3-input NOR gate
PIN DESCRIPTION
PIN NO.
1, 3, 9
2, 4, 10
13, 5, 11
7
12, 6, 8
14
SYMBOL
1A to 3A
1B to 3B
1C to 3C
GND
1Y to 3Y
V
CC
NAME AND FUNCTION
data inputs
data inputs
data inputs
ground (0 V)
data outputs
positive supply voltage
74HC/HCT27
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
FUNCTION TABLE
INPUTS
nA
L
X
X
H
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Fig.4 Functional diagram.
Fig.5 Logic diagram (one gate).
nB
L
X
H
X
nC
L
H
X
X
OUTPUT
nY
H
L
L
L
December 1990
3
Philips Semiconductors
Product specification
Triple 3-input NOR gate
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
I
CC
category: SSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(°C)
74HC
SYMBOL PARAMETER
+25
min. typ.
t
PHL
/ t
PLH
propagation delay
nA, nB, nC to nY
output transition time
28
10
8
19
7
6
max.
90
18
15
75
15
13
−40
to
+85
min. max.
115
23
20
95
19
16
−40
to
+125
min. max.
135
27
23
110
22
19
ns
UNIT
74HC/HCT27
TEST CONDITIONS
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
WAVEFORMS
Fig.6
t
THL
/ t
TLH
ns
Fig.6
December 1990
4
Philips Semiconductors
Product specification
Triple 3-input NOR gate
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
I
CC
category: SSI
Note to HCT types
74HC/HCT27
The value of additional quiescent supply current (∆I
CC
) for a unit load of 1 is given in the family specifications.
To determine
∆I
CC
per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
nA, nB, nC
UNIT LOAD COEFFICIENT
1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; t
r
= t
f
= 6 ns; C
L
= 50 pF
T
amb
(°C)
74HCT
SYMBOL PARAMETER
min.
t
PHL
/ t
PLH
t
THL
/ t
TLH
propagation delay
nA, nB, nC to nY
output transition time
+25
typ.
12
7
−40
to
+85
max. min.
21
15
max.
26
19
−40
to
+125
min. max.
32
22
ns
ns
4.5
4.5
Fig.6
Fig.6
UNIT
V
CC
(V)
WAVEFORMS
TEST CONDITIONS
AC WAVEFORMS
(1) HC : V
M
= 50%; V
I
= GND to V
CC
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Fig.6 Waveforms showing the input (nA, nB, nC) to output (nY) propagation delays and the output transition times.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
5
