SP332 Datasheet, PDF (4/10 Pages) Sipex Corporation – RS-232/RS-485 Multi-Mode Serial Transceiver

A
R
V_OD
B
R ^VOC
Figure 1. RS-485 Driver DC Test Load Circuit
Receiver ^{Test Point}
Output
C_RL
S₁
1K
1K
V_CC
S₂
Figure 2. Receiver Timing Test Load Circuit
DI
A ^RDI^CFFL1
A
RO
B
B
C_L2
15pF
Output
500
S₁
V_CC
Under
Test
C_L
S₂
Figure 3. RS-485 Driver/Receiver Timing Test Circuit Figure 4. RS-485 Driver Timing Test Load #2 Circuit
+3V
DI
0V
B
DRIVER
OUTPUT
A
DIFFERENTIAL
OUTPUT
V_A – V_B
V_O+
0V
V_O–
f = 1MHz; t_R ≤ 10ns; t_F ≤ 10ns
1.5V
V_O^1/2VO
t_PLH
t_PHL
t_SKEW
t_R
1.5V
t_PLH
1/2V_O
t_SKEW
t_F
Figure 6. RS-485 Driver Propagation Delays
V_OD2+
A–B
V_OD2–
V_OH
R
V_OL
t_PHL
f = 1MHz; t_R ≤ 10ns; t_F ≤ 10ns
0V
INPUT
1.5V
OUTPUT
t_PHL
0V
1.5V
Figure 7. RS-485 Receiver Propagation Delays
TGoddard/SP332/9617R0
SP332 RS-232/RS-485 Multi-Mode Serial Transceiver
4
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