74F455 Ver la hoja de datos (PDF) - Philips Electronics
Número de pieza
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fabricante
74F455 Datasheet PDF : 12 Pages
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Philips Semiconductors
Buffers/Drivers
Product specification
74F455,* 74F456
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Dn
SE, SO, Qn
VM
VM
tPLH
tPHL
VM
VM
SF00965
Waveform 1. Propagation Delay, Non-Inverting Outputs
OEn
SE, SO, Qn, Qn
VM
tPZH
VM
tPHZ
VM
VOH -0.3V
0V
SF00967
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
Dn
SE, SO, Qn
VM
VM
tPHL
tPLH
VM
VM
SF00966
Waveform 2. Propagation Delay, Inverting Outputs
OEn
VM
VM
tPZL
tPLZ
SE, SO, Qn, Qn
VM
VOL +0.3V
SF00968
Waveform 4. 3-State Output Enable Time to Low Level and
Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORMS
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
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
8
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