MC74LCX2245 Motorola, MC74LCX2245 Datasheet - Page 5

• Manufacturer Part Number: MC74LCX2245
• Description: LOW-VOLTAGE CMOS OCTAL TRANSCEIVER
• Manufacturer: Motorola

CAPACITIVE CHARACTERISTICS
LCX DATA
BR1339 — REV 3
C IN
C I/O
C PD
Symbol
Input Capacitance
Input/Output Capacitance
Power Dissipation Capacitance
GENERATOR
PULSE
OE, T/R
Parameter
An, Bn
Bn, An
An, Bn
An, Bn
C L = 50pF or equivalent (Includes jig and probe capacitance)
R L = R 1 = 500 or equivalent
R T = Z OUT of pulse generator (typically 50 )
t PLH , t PHL
t PZL , t PLZ
Open Collector/Drain t PLH and t PHL
t PZH , t PHZ
WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES
t PZH
t PZL
t PLH
1.5V
t R = t F = 2.5ns, 10% to 90%; f = 1MHz; t W = 500ns
t R = t F = 2.5ns, 10% to 90%; f = 1MHz; t W = 500ns
WAVEFORM 1 – PROPAGATION DELAYS
Figure 3. AC Waveforms
1.5V
R T
Figure 4. Test Circuit
TEST
10MHz, V CC = 3.3V, V I = 0V or V CC
1.5V
1.5V
V CC
DUT
1.5V
V CC = 3.3V, V I = 0V or V CC
V CC = 3.3V, V I = 0V or V CC
5
t PHZ
t PLZ
Condition
1.5V
1.5V
C L
1.5V
t PHL
SWITCH
Open
GND
6V
6V
R L
R 1
V OL + 0.3V
GND
2.7V
0V
V OH
V OL
2.7V
0V
V CC
V OH – 0.3V
3.0V
0V
Typical
25
7
8
6V
OPEN
GND
MC74LCX2245
MOTOROLA
Unit
pF
pF
pF