XR34350 Datasheet, PDF (13/20 Pages) Exar Corporation – Internal Termination and Wide Output Swing

Test Circuits
R_TERM
=
2
(V_A
I_A -
- V_B)
V_B
I_B
B
±2V
R_TERM
TERM = V_CC
Rx
-7V ≤ V_A, V_B ≤ +12V A
I_A
Termination is enabled in RS-485/RS-422 modes when the TERM pin is held high (V_CC).
Figure 6. RS-485/RS-422 Receiver Termination Resistance
XR34350
Tx Input = 0V or V_CC
Tx
V_OD
Tx Enable = V_CC
B
R_L
2
V_CM
R_L
2
A
Figure 7. RS-485/RS-422 Differential Driver Output Voltage
Tx Input = 0V or V_CC
Tx
Tx Enable = V_CC
B
375Ω
V_OD 60Ω
V_CM
375Ω
A
Figure 8. RS-485/RS-422 Differential Driver Output Voltage Over Common Mode
B
I_OSD
Tx Input = 0V or V_CC
Tx
Tx Enable = 0V or V_CC
V
A
Figure 9. RS-485/RS-422 Driver Output Short-circuit Current
REV1B
13/20