參數(shù)資料
型號(hào)： 933794690602
廠商： NXP SEMICONDUCTORS
元件分類： 算術(shù)邏輯單元
英文描述： F/FAST SERIES, 8-BIT ENCODER, PDIP16
封裝： 0.300 INCH, PLASTIC, SOT-38-4, DIP-16
文件頁(yè)數(shù)： 7/10頁(yè)
文件大小： 95K
代理商： 933794690602
Philips Semiconductors
Product specification
74F148
8-input priority encoder
March 1, 1990
6
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST
CONDITION
VCC = +5.0V
Tamb = +25°C
CL = 50pF, RL = 500
VCC = +5.0V ± 10%
Tamb = 0°C to +70°C
CL = 50pF, RL = 500
UNIT
MIN
TYP
MAX
MIN
MAX
tPLH
tPHL
Propagation delay
In to An
Waveform 2
3.5
6.0
9.0
3.5
10.0
ns
tPLH
tPHL
Propagation delay
In to EO
Waveform 1
1.5
3.0
2.5
6.5
1.5
7.5
ns
tPLH
tPHL
Propagation delay
In to GS
Waveform 2
2.0
4.0
8.0
2.0
9.0
ns
tPLH
tPHL
Propagation delay
EI to An
Waveform 2
3.5
3.0
6.0
5.5
8.5
8.0
3.5
3.0
9.5
9.0
ns
tPLH
tPHL
Propagation delay
EI to GS
Waveform 2
2.5
3.0
4.5
5.5
7.0
7.5
2.5
3.0
8.0
8.5
ns
tPLH
tPHL
Propagation delay
EI to EO
Waveform 2
3.0
3.5
5.0
7.0
7.5
3.0
3.5
8.0
9.0
ns
AC WAVEFORMS
For all waveforms, VM = 1.5V.
VM
An, EO, GS
In, EI
tPHL
tPLH
SF00186
Waveform 1.
For Inverting Outputs
VM
An, EO, GS
In, EI
tPHL
tPLH
SF00187
Waveform 2.
For Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
tTHL (tf )
INPUT PULSE REQUIREMENTS
rep. rate
tw
tTLH
tTHL
1MHz
500ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Totem-Pole Outputs
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.
tTHL (tf )
tTLH (tr )
AMP (V)
amplitude
3.0V
1.5V
VM
SF00006
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