INTEGRATED CIRCUITS
DATA SH EET
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 74HC/HCT27
FEATURES
• Output capability: standard
• ICC category: SSI
GENERAL DESCRIPTION
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
=25°C; tr=tf= 6 ns
amb
SYMBOL PARAMETER CONDITIONS
t
PHL
C
C
I
PD
/ t
PLH
propagation delay nA, nB, nC to nY CL= 15 pF; VCC= 5 V 8 10 ns
input capacitance 3.5 3.5 pF
power dissipation capacitance per gate notes 1 and 2 24 30 pF
Notes
1. C
is used to determine the dynamic power dissipation (PD in µW):
PD
PD=CPD× V
2
× fi+∑(CL× V
CC
2
× fO) where:
CC
fi= input frequency in MHz
fo= output frequency in MHz
∑ (CL× V
2
× fo) = sum of outputs
CC
CL= output load capacitance in pF
VCC= supply voltage in V
2. For HC the condition is VI= GND to V
CC
For HCT the condition is VI= GND to VCC− 1.5 V
TYPICAL
UNIT
HC HCT
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
December 1990 2
.
Philips Semiconductors Product specification
Triple 3-input NOR gate 74HC/HCT27
PIN DESCRIPTION
PIN NO. SYMBOL NAME AND FUNCTION
1, 3, 9 1A to 3A data inputs
2, 4, 10 1B to 3B data inputs
13, 5, 11 1C to 3C data inputs
7 GND ground (0 V)
12, 6, 8 1Y to 3Y data outputs
14 V
CC
positive supply voltage
Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.
FUNCTION TABLE
INPUTS OUTPUT
nA nB nC nY
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).
L
L
X
H
H
X
X
X
H
L
L
L
December 1990 3
Philips Semiconductors Product specification
Triple 3-input NOR gate 74HC/HCT27
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
Output capability: standard
ICC category: SSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t
= 6 ns; CL= 50 pF
r=tf
SYMBOL PARAMETER
t
PHL
/ t
propagation delay
PLH
nA, nB, nC to nY
t
THL
/ t
output transition time 19
TLH
(°C) TEST CONDITIONS
T
amb
74HC
+25 −40 to +85 −40 to +125
min. typ. max. min. max. min. max.
28
10
8
7
6
90
18
15
75
15
13
115
23
20
95
19
16
135
27
23
110
22
19
.
UNIT
ns 2.0
ns 2.0
V
(V)
4.5
6.0
4.5
6.0
CC
WAVEFORMS
Fig.6
Fig.6
December 1990 4
Philips Semiconductors Product specification
Triple 3-input NOR gate 74HC/HCT27
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: standard
ICC category: SSI
Note to HCT types
The value of additional quiescent supply current (∆I
) for a unit load of 1 is given in the family specifications.
CC
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT UNIT LOAD COEFFICIENT
nA, nB, nC 1.50
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr=tf= 6 ns; CL= 50 pF
(°C) TEST CONDITIONS
T
amb
74HCT
SYMBOL PARAMETER
+25 −40 to +85 −40 to +125
UNIT
V
(V)
CC
min. typ. max. min. max. min. max.
t
PHL
/ t
propagation delay
PLH
12 21 26 32 ns 4.5 Fig.6
nA, nB, nC to nY
t
THL
/ t
output transition time 7 15 19 22 ns 4.5 Fig.6
TLH
WAVEFORMS
AC WAVEFORMS
(1) HC : VM= 50%; VI= GND to VCC.
HCT: V
= 1.3 V; VI= GND to 3 V.
M
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
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