SP3224E Datasheet, PDF (10/23 Pages) Sipex Corporation – 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus

CHARACTERIZATION CIRCUITS AND WAVEFORMS
Generator
(see note B)
50Ω
RL
3V
SHUTDOWN
TEST CIRCUIT
RS-232
Output
CL
(see note A)
SR= ^6V
tTHL or tTLH
Input
Output
3V
0V
tTHL
3V
-3V
tTLH
3V
-3V
VOH
VOL
VOLTAGE WAVEFORMS
NOTES A. CL includes probe and jig capacitance
B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns
Figure 1. Driver Slew Rate
Generator
(see note B)
50Ω
RL
3V
SHUTDOWN
TEST CIRCUIT
RS-232
Output
CL
(see note A)
Input
1.5V
tDPHL
Output
50%
1.5V
tDPLH
50%
I I Skew= tDPHL- tDPLH
VOLTAGE WAVEFORMS
3V
0V
VOH
VOL
NOTES A. CL includes probe and jig capacitance
B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns
Figure 2. Driver Propagation and Skew
Generator
(see note B)
3V or 0V
ONLINE
50Ω
3V
SHUTDOWN
RS-232
Output
CL
(see note A)
Input
1.5V
tRPHL
Output
50%
3V
1.5V
0V
tRPLH
50%
VOH
VOL
TEST CIRCUIT
I I Skew= tRPHL- tRPLH
VOLTAGE WAVEFORMS
NOTES A. CL includes probe and jig capacitance
B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns
Figure 3. Receiver Propagation Delay and Skew
3V or 0V
ONLINE
VCC
S1
GND
RL
Input
tPHZ
(51 at GND)
1.5V
3V
1.5V
0V
tPZH
3V or 0V
Output
VOH
SHUTDOWN
Generator
(See Note B)
50Ω
CL
(see note A)
Output
0.3V
tPLZ
(51 at VCC)
0.3V
50%
tPZL
(S1 at VCC)
Output
50%
VOL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A CL includes probe and jig capacitance
B. The pulse generator has the folowing characteristics Zo=50Ω, 50% duty cycle, tr ≤10ns, tf ≤10ns
C. tPLZ and tPHZ are the same as tdis
D. tPZL and tPZH are the same as ten
Figure 4. Receiver Enable and Disable Times
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line^® Plus
10
© 2006 Sipex Corporation