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| 74F640 Datasheet, PDF (7/11 Pages) NXP Semiconductors – Octal bus transceiver, inverting 3-State | |||
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Philips Semiconductors
Octal bus transceiver, inverting (3-State)
Product specification
74F640
AC WAVEFORMS
For all waveforms, VM = 1.5V.
An, Bn
VM
tPHL
VM
tPLH
Bn, An
VM
VM
SF00773
Waveform 1. Propagation Delay for Inverting Outputs
OE
An, Bn
VM
tPZH
VM
tPHZ
VM
VOHâ0.3V
0V
SF00203
Waveform 3. 3-State Output Enable Time to High Level and
Output Disable Time from High Level
OE
An, Bn
VM
tPZL
VM
tPLZ
VM
VOL+0.3V
SF00204
Waveform 2. 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 Open Collector 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
SF00128
1989 Nov 27
7
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