MC74LCX646 Datasheet, PDF (7/10 Pages) Motorola, Inc – LOW-VOLTAGE CMOS OCTAL TRANSCEIVER/ REGISTERED TRANSCEIVER

2.7V
An, Bn
1.5V
0V
ts
th
2.7V
CAB,
1.5V
tw
1.5V
CBA
0V
fmax
tPLH, tPHL
VOH
Bn, An
1.5V
VOL
WAVEFORM 3 – CLOCK to Bn/An PROPAGATION DELAYS, CLOCK MINIMUM PULSE WIDTH,
An/Bn to CLOCK SETUP AND HOLD TIMES
tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns except when noted
tw
NEGATIVE
1.5V
1.5V
PULSE
MC74LCX646
POSITIVE
1.5V
1.5V
PULSE
tw
WAVEFORM 4 – INPUT PULSE DEFINITION
tR = tF = 2.5ns, 10% to 90% of 0V to 2.7V
Figure 2. AC Waveforms
PULSE
GENERATOR
VCC
DUT
RT
R1
CL
RL
6V
OPEN
GND
LCX DATA
BR1339 — REV 3
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
6V
Open Collector/Drain tPLH and tPHL
6V
tPZH, tPHZ
GND
CL = 50pF or equivalent (Includes jig and probe capacitance)
RL = R1 = 500Ω or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Figure 3. Test Circuit
7
MOTOROLA