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PDF 74ALS138 Data sheet ( Hoja de datos )
| Número de pieza | 74ALS138 | |
| Descripción | 1-of-8 decoder/demultiplexer | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
74ALS138
1-of-8 decoder/demultiplexer
Product specification
IC05 Data Handbook
1996 Jul 03
Philips
Semiconductors
1 page  
Philips Semiconductors
1-of-8 decoder/demultiplexer
Product specification
74ALS138
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH Propagation delay
tPHL
An to Qn
tPLH Propagation delay
tPHL E1, E2 to Qn
tPLH Propagation delay
tPHL
E2 to Qn
AC WAVEFORMS
For all waveforms, VM = 1.3V.
An, E2
Qn
VM
tPHL
VM
VM
tPLH
VM
TEST CONDITION
Waveform 1, 2
Waveform 2
Waveform 1
LIMITS
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF, RL = 500Ω
MIN MAX
3.0 22.0
3.0 18.0
3.0 17.0
3.0 17.0
3.0 17.0
3.0 17.0
UNIT
ns
ns
ns
An, E0, E1
Qn
VM
tPHL
VM
VM
tPLH
VM
SF00179
Waveform 1. Propagation Delay for Inverting Outputs
SF00180
Waveform 2. Propagation Delay for Non-inverting Outputs
TEST CIRCUIT AND WAVEFORMS
VCC
PULSE
GENERATOR
VIN
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
1996 Jul 03
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 74ALS138.PDF ] | |
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