74F148 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
74F148 Datasheet PDF : 10 Pages
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Philips Semiconductors
8-input priority encoder
Product specification
74F148
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH
Propagation delay
tPHL
In to An
tPLH
Propagation delay
tPHL
In to EO
tPLH
Propagation delay
tPHL
In to GS
tPLH
Propagation delay
tPHL
EI to An
tPLH
Propagation delay
tPHL
EI to GS
tPLH
Propagation delay
tPHL
EI to EO
AC WAVEFORMS
For all waveforms, VM = 1.5V.
TEST
CONDITION
Waveform 2
Waveform 1
Waveform 2
Waveform 2
Waveform 2
Waveform 2
LIMITS
VCC = +5.0V
Tamb = +25°C
CL = 50pF, RL = 500Ω
MIN TYP MAX
VCC = +5.0V ± 10%
Tamb = 0°C to +70°C
CL = 50pF, RL = 500Ω
MIN
MAX
3.5
6.0
9.0
3.5
10.0
3.5
6.0
9.0
3.5
10.0
1.5
3.0
6.5
1.5
7.5
1.5
2.5
6.5
1.5
7.5
2.0
4.0
8.0
2.0
9.0
2.0
4.0
8.0
2.0
9.0
3.5
6.0
8.5
3.5
9.5
3.0
5.5
8.0
3.0
9.0
2.5
4.5
7.0
2.5
8.0
3.0
5.5
7.5
3.0
8.5
3.0
5.0
7.0
3.0
8.0
3.5
5.0
7.5
3.5
9.0
UNIT
ns
ns
ns
ns
ns
ns
In, EI
An, EO, GS
VM
VM
tPHL
VM
tPLH
VM
In, EI
An, EO, GS
VM
VM
tPHL
VM
tPLH
VM
Waveform 1. For Inverting Outputs
SF00186
SF00187
Waveform 2. 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
March 1, 1990
6
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