74ALS38 データシートの表示（PDF） - Philips Electronics
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74ALS38 Datasheet PDF : 7 Pages
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Philips Semiconductors
Quad 2-input NAND buffer (open collector)
Product specification
74ALS38A
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH
Propagation delay
tPHL
nA or nB 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
3.0
11.0
3.0
11.0
UNIT
ns
nA, nB
nY
VM
tPHL
VM
tPLH
VM
VM
SC00004
Waveform 1. Propagation Delay for Data to Output
TEST CIRCUIT AND WAVEFORMS
VCC
7.0V
VIN
VOUT
RL
PULSE
D.U.T.
GENERATOR
RT
CL RL
Test Circuit for Open Collector 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
SC00036
1991 Feb 08
4
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