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Philips Semiconductors
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
AC WAVEFORMS
For all waveforms, V
= 1.5V.
M
V
In or S
M
t
PHL
V
Yn
M
Waveform 1. Propagation Delay, Data and Select to Output
OE
V
M
t
PZH
Yn
Waveform 2. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
V
CC
V
IN
PULSE
D.U.T.
GENERATOR
R
T
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST
SWITCH
t
closed
PLZ
t
closed
PZL
All other
open
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
C
= Load capacitance includes jig and probe capacitance;
L
see AC electrical characteristics for value.
R
= Termination resistance should be equal to Z
T
pulse generators.
1995 Mar 31
V
M
t
PLH
V
M
SF00679
V
M
t
PHZ
V
–0.3V
OH
V
M
0V
SF00213
7.0V
NEGATIVE
R
L
PULSE
V
OUT
C
R
L
L
POSITIVE
PULSE
of
OUT
OE
V
M
t
PZL
Yn
Waveform 3. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
t
w
90%
V
M
10%
t
t
)
THL (
f
t
t
)
TLH (
r
90%
V
M
10%
t
w
Input Pulse Definition
INPUT PULSE REQUIREMENTS
family
V
amplitude
rep. rate
M
74F
3.0V
1.5V
1MHz
6
Product specification
74F257A
V
M
t
PLZ
V
M
V
+0.3V
OL
SF00214
AMP (V)
90%
V
M
10%
0V
t
t
)
TLH (
r
t
t
)
THL (
f
AMP (V)
90%
V
M
10%
0V
t
t
t
w
TLH
THL
2.5ns
2.5ns
500ns
SF00777
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