MC74LCX245
2.7V
An, Bn
1.5V
1.5V
0V
tPLH
Bn, An
1.5V
tPHL
VOH
1.5V
VOL
WAVEFORM 1 – PROPAGATION DELAYS
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
2.7V
OE, T/R
1.5V
1.5V
0V
tPZH
An, Bn
1.5V
≈
0V
tPZL
1.5V
VOL + 0.3V
GND
WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
tPLZ
≈
3.0V
tPHZ
VCC
VOH – 0.3V
An, Bn
Figure 1. AC Waveforms
VCC
6V
OPEN
GND
PULSE
GENERATOR
RT
DUT
CL
R1
RL
TEST
tPLH, tPHL
tPZL, tPLZ
Open Collector/Drain tPLH and tPHL
tPZH, tPHZ
SWITCH
Open
6V
6V
GND
CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Figure 2. Test Circuit
LCX DATA
BR1339 — REV 3
5
MOTOROLA
MOTOROLA [ MOTOROLA, INC ]
