N74F2244N 查看數據表（PDF） - Philips Electronics
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N74F2244N Datasheet PDF : 10 Pages
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Philips Semiconductors
Octal buffer with 30Ω equivalent output termination
(3-State)
Product specification
74F2244
AC WAVEFORMS
For all waveforms, VM = 1.5V.
Ian, Ibn
Yn
VM
tPLH
VM
tPHL
VM
VM
SF00231
Waveform 1. Propagation delay for data to outputs
OEn
Yn
VM
tPZL
VM
tPLZ
VM
3.5V
VOL+0.3V
SF00234
Waveform 3. 3-State output enable time to low level
and output disable time from low level
OEn
VM
VM
tPZH
tPHZ
VOH–0.3V
Yn
VM
0V
SF00233
Waveform 2. 3-State output enable time to high level
and output disable time from high level
TEST CIRCUIT AND WAVEFORMS
SWITCH POSITION
TEST SWITCH
tPLZ, tPZL closed
All other open
VIN
PULSE
GENERATOR
VCC
VOUT
D.U.T.
7.0V
RL
RT
CL RL
Test circuit for 3-State outputs
DEFINITIONS:
RL =
CL =
Load resistor; see AC electrical characteristics for
value.
Load capacitance includes jig and probe
capacitance; see AC electrical characteristics for
value
RT = Termination resistance should be equal to ZOUT of
pulse generators.
90%
NEGATIVE
PULSE
tw
VM
10%
tTHL (tf )
VM
10%
tTLH (tr )
90%
AMP (V)
0V
POSITIVE
PULSE
10%
tTLH (tr )
90%
VM
tTHL (tf )
90%
VM
tw
Input pulse definition
AMP (V)
10%
0V
INPUT PULSE REQUIREMENTS
family
amplitude VM rep. rate
tw
tTLH
74F
3.0V 1.5V 1MHz 500ns 2.5ns
tTHL
2.5ns
SF000235
1994 Dec 05
5
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