SP337EBEY-L Datasheet, PDF (9/18 Pages) Exar Corporation – 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER

SP337E
REV. 1.0.2
3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
FIGURE 4. RS-485 DRIVER OUTPUT SHORT CIRCUIT TEST
EN = 0 or Vcc
A
DI = 0 or Vcc
D
B
IOS D
-7V to +12V V
FIGURE 5. RS-485 DRIVER PROPAGATION DELAY TEST CIRCUIT
A
DI _Tx
VOD
B
3.3V
R_L
C_L
54Ω 50pF
FIGURE 6. RS-485 DRIVER TIMING DIAGRAM
Vcc
DI
0V
B
A
V_DIFF
V_A – V_B
V_O⁺
0V
V_O^–
Vcc/2
V_O ^1/2VO
t_PLH
t_PHL
Vcc/2
1/2V_O
t_DPLH
90%
10%
t_R
t_DPHL
t _SKEW = |t _DPLH - t_DPHL|
90%
10%
t_F
9