74ALS27 查看數據表（PDF） - Philips Electronics
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74ALS27 Datasheet PDF : 7 Pages
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Philips Semiconductors
Triple 3-input NOR gate
Product specification
74ALS27
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH
Propagation delay
tPHL
nA, nB, nC to nY
AC WAVEFORMS
For all waveforms, VM = 1.3V.
TEST CONDITION
Waveform 1
LIMITS
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF, RL = 500Ω
MIN
MAX
2.0
15.0
2.0
9.0
UNIT
ns
nA, nB, nC
nY
VM
tPHL
VM
tPLH
VM
VM
SC00018
Waveform 1. Propagation Delay for Data to Output
TEST CIRCUIT AND WAVEFORMS
VCC
VIN
PULSE
GENERATOR
VOUT
D.U.T.
RT
CL RL
Test Circuit for Totem-pole Outputs
90%
NEGATIVE
PULSE
POSITIVE
PULSE
10%
tw
VM
10%
tTHL (tff)
VM
10%
tTLH (tr )
tTLH (tr )
90%
VM
tw
tTHL (tf )
90%
VM
90%
AMP (V)
0.3V
AMP (V)
10%
0.3V
DEFINITIONS:
RL = Load resistor;
see AC electrical characteristics for value.
CL = Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
RT = Termination resistance should be equal to ZOUT of
pulse generators.
Input Pulse Definition
INPUT PULSE REQUIREMENTS
Family
Amplitude VM Rep.Rate tw tTLH
74ALS 3.5V 1.3V 1MHz 500ns 2.0ns
tTHL
2.0ns
SC00005
1991 Feb 08
4
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