Product specification
File under Integrated Circuits, IC06
December 1990
Philips SemiconductorsProduct specification
Triple 3-input NOR gate74HC/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
SYMBOLPARAMETERCONDITIONS
t
PHL
C
C
I
PD
/ t
PLH
propagation delay nA, nB, nC to nYCL= 15 pF; VCC= 5 V810ns
input capacitance3.53.5pF
power dissipation capacitance per gatenotes 1 and 22430pF
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
HCHCT
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
December 19902
.
Philips SemiconductorsProduct specification
Triple 3-input NOR gate74HC/HCT27
PIN DESCRIPTION
PIN NO.SYMBOLNAME AND FUNCTION
1, 3, 91A to 3Adata inputs
2, 4, 101B to 3Bdata inputs
13, 5, 111C to 3Cdata inputs
7GNDground (0 V)
12, 6, 81Y to 3Ydata outputs
14V