74F138 데이터 시트보기 (PDF) - Philips Electronics
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74F138 Datasheet PDF : 8 Pages
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Philips Semiconductors
1-of-8 decoder/demultiplexer
Product specification
74F138
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
TEST
CONDITION
tPLH
Propagation delay
tPHL
An to Qn
tPLH
Propagation delay
tPHL
E0 or E1 to Qn
tPLH
Propagation delay
tPHL
E2 to Qn
Waveform 1, 2
Waveform 2
Waveform 1
LIMITS
VCC = +5.0V
Tamb = +25°C
CL = 50pF
RL = 500Ω
VCC = +5.0V ± 10%
Tamb = 0°C to +70°C
CL = 50pF
RL = 500Ω
VCC = +5.0V ± 10%
Tamb = –40°C to +85°C
CL = 50pF
RL = 500Ω
MIN TYP MAX MIN
MAX
MIN
MAX
3.5 5.6 7.0
3.5
8.0
3.0
8.5
4.0 6.1 8.0
4.0
9.0
3.5
9.0
3.5 6.4 7.0
3.5
8.0
3.0
8.0
3.0 5.3 7.0
3.0
7.5
3.0
7.5
4.0 6.2 8.0
4.0
9.0
4.0
9.5
3.5 5.6 7.5
3.5
8.5
3.5
8.5
UNIT
ns
ns
ns
AC WAVEFORMS
For all waveforms, VM = 1.5V
An, E2
Qn
VM
VM
tPHL
VM
tPLH
VM
An, E0, E1
Qn
VM
VM
tPHL
VM
tPLH
VM
SF00179
Waveform 1. Propagation Delay for Inverting Outputs
SF00180
Waveform 2. Propagation Delay for Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
VIN
PULSE
GENERATOR
VCC
VOUT
D.U.T.
NEGATIVE
PULSE
90%
tw
VM
10%
tTHL (tf )
VM
10%
tTLH (tr )
90%
AMP (V)
0V
RT
CL RL
Test Circuit for Totem-Pole Outputs
POSITIVE
PULSE
10%
tTLH (tr )
90%
VM
tw
tTHL (tf )
90%
VM
AMP (V)
10%
0V
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
family
74F
INPUT PULSE REQUIREMENTS
amplitude VM rep. rate
tw
tTLH
3.0V 1.5V 1MHz 500ns 2.5ns
tTHL
2.5ns
SF00006
February 14, 1991
5
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