MC74F2245 Datasheet, PDF (3/5 Pages) Motorola, Inc – 25ohm OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE INPUTS AND OUTPUTS

MC74F2245
An, Bn
1.5V
tPLH
Bn, An
3.0V
1.5V
0V
tPHL
VOH
1.5V
1.5V
VOL
WAVEFORM 1 – PROPAGATION DELAYS
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
OE, T/R
An, Bn
An, Bn
1.5V
1.5V
tPZH
tPHZ
1.5V
tPZL
tPLZ
1.5V
WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns
Figure 1. AC Waveforms
3.0V
0V
VOH
VOH – 0.3V
≈ 0V
≈ 3.5V
VOL + 0.3V
GND
PULSE
GENERATOR
VCC
DUT
RT
R1
CL
RL
7V
OPEN
TIMING SOLUTIONS
BR1333 — REV 5
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
7V
tPZH, tPHZ
Open
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
3
MOTOROLA