74F257A Philips, 74F257A Datasheet - Page 6

• Manufacturer Part Number: 74F257A
• Description: Quad 2-line to 1-line selector/multiplexer / non-inverting 3-State
• Manufacturer: Philips

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