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74F257A データシートの表示(PDF) - Philips Electronics

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74F257A Quad 2-line to 1-line selector/multiplexer, non-inverting (3-State) Philips
Philips Electronics Philips
74F257A Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Philips Semiconductors
Quad 2-line to 1-line selector/multiplexer, non-inverting
(3-State)
Product specification
74F257A
AC WAVEFORMS
For all waveforms, VM = 1.5V.
In or S
Yn
VM
VM
tPHL
VM
tPLH
VM
SF00679
Waveform 1. Propagation Delay, Data and Select to Output
OE
VM
VM
tPZH
tPHZ
VOH–0.3V
VM
Yn
0V
SF00213
Waveform 2. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
TEST CIRCUIT AND WAVEFORMS
OE
VM
VM
tPZL
tPLZ
Yn
VM
VOL+0.3V
SF00214
Waveform 3. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
VCC
VIN
PULSE
GENERATOR
VOUT
RL
D.U.T.
RT
CL RL
Test Circuit for 3-State Outputs
SWITCH POSITION
TEST
tPLZ
tPZL
All other
SWITCH
closed
closed
open
7.0V
90%
NEGATIVE
PULSE
POSITIVE
PULSE
10%
tw
VM
10%
tTHL (tf )
VM
10%
tTLH (tr )
tTLH (tr )
90%
VM
tw
tTHL (tf )
90%
VM
Input Pulse Definition
90%
AMP (V)
0V
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 REQUIREMENTS
family
amplitude VM rep. rate
tw
tTLH
74F
3.0V 1.5V 1MHz 500ns 2.5ns
tTHL
2.5ns
SF00777
1995 Mar 31
6
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