74ALS257N Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
componentes Descripción
Fabricante
74ALS257N Datasheet PDF : 11 Pages
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Philips Semiconductors
Data selector/multiplexer
Product specification
74ALS257/74ALS258
AC ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation delay
I0n or I1n to Yn
Propagation delay
S to Yn
Output enable time
OE to Yn
Output disable time
OE to Yn
Propagation delay
I0n or I1n to Yn
Propagation delay
S to Yn
Output enable time
OE to Yn
Output disable time
OE to Yn
AC WAVEFORMS
For all waveforms, VM = 1.3V.
TEST CONDITION
74ALS257
74ALS258
Waveform 1
Waveform 1, 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
Waveform 1
Waveform 1, 2
Waveform 3
Waveform 4
Waveform 3
Waveform 4
LIMITS
Tamb = 0°C to +70°C
VCC = +5.0V ± 10%
CL = 50pF, RL = 500Ω
MIN
MAX
2.0
9.0
2.0
9.0
4.0
12.0
4.0
12.0
3.0
11.0
4.0
12.0
2.0
9.0
5.0
12.0
2.0
8.0
2.0
8.0
4.0
12.0
4.0
12.0
3.0
11.0
4.0
12.0
2.0
9.0
5.0
12.0
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
I0n, I1n, S
Yn, Yn
VM
tPLH
VM
tPHL
VM
VM
SC00059
Waveform 1. Propagation Delay for Data and
Select to Outputs
I0n, I1n, S
Yn, Yn
VM
tPHL
VM
tPLH
VM
VM
SC00060
Waveform 2. Propagation Delay for Data and
Select to Outputs
OE
Yn, Yn
VM
tPZH
VM
VM
tPHZ
VOH -0.3V
0V
SC00084
Waveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
OEn
VM
VM
Yn, Yn
tPZL
VM
tPLZ
3.5V
VOL +0.3V
SC00085
Waveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
1991 Feb 08
6
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