SLLA637 May   2024 THVD4431

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Key Feature Highlights of THVD4431 Over XR34350 and SP339E/B
    1. 2.1 Regulated Output Voltage for RS-232
    2. 2.2 Full Path Diagnostic Loopback
    3. 2.3 Operating Ambient Temperature Range
    4. 2.4 Integrated Switchable Termination Resistor on Both Driver (R1/R2) and Receiver (R3/R4) Bus Pins
    5. 2.5 1.65V to 5.5V Supply for Logic Data and Control Signals
  6. 3Potential Design Changes
    1. 3.1 Pin 9 (VIO)
    2. 3.2 Pin 13 (MODE2)
    3. 3.3 Pin 17 (TERM_TX) and Pin 18 (TERM_RX)
    4. 3.4 Pin 19 (SHDN)
    5. 3.5 Pin 36 (NC)
  7. 4Pinout Mapping
  8. 5Summary
  9. 6References

4 Pinout Mapping

Table 4-1 Pinout Mapping of THVD4431 vs XR34350
THVD4431 Pin Number XR34350 and SP339E/B pin number Description
Power and Ground Pins
VCC 20,32,38 9,20,32,38 3 to 5.5V supply voltage
VIO 9 N/A 1.65V to 5.5V logic supply voltage
V- 33 33 (VSS) Negative charge pump rail
C2- 34 34 Negative terminal of charge pump capacitor-2
C1- 35 35 Negative terminal of charge pump capacitor-1
C1+ 37 37 Positive terminal of charge pump capacitor-1
C2+ 39 39 Positive terminal of charge pump capacitor-2
V+ 40 40 (VDD) Positive charge pump rail
GND 10,23,26,29 10,23,26,29,36 Ground
Logic data pins
L1 1 1 Logic output (RS-232)
L2 2 2

Logic output

(RS-232/RS-485)
L3 3 3

Logic input

(RS-232/RS-485)
L4 4 4 Logic input (RS-232)
L5 (L6 for the Maxlinear devices) 5 5 Logic output (RS-232)
L6 (L7 for the Maxlinear devices) 6 6 Logic input (RS-232)
L7 (L8 for the Maxlinear devices) 7 7 Logic output (RS-232)
L8 (L9 for the Maxlinear devices) 8 8 Logic output (RS-232)
Bus pins
R1 31 31 RS-232 receiver input or RS-485 bus pin (Z or B)
R2 30 30 RS-232 receiver input or RS-485 bus pin (Y or A)
R3 28 28 RS-232 driver output or RS-485 non-inverting receiver input (A)
R4 27 27 RS-232 driver output or RS-485 inverting receiver input (B)
R5 (R6 for the Maxlinear devices) 25 25 RS-232 receiver input
R6 (R7 for the Maxlinear devices) 24 24 RS-232 driver output
R7 (R8 for the Maxlinear devices) 22 22 RS-232 receiver input
R8 (R9 for the Maxlinear devices) 21 21 RS-232 receiver input
Logic control pins
SLR (SLEW for Maxlinear devices) 11 11 Slew rate control, internal pull-down resistor. SLR=H enables slow speed
DIR 12 12 RS-485 TX/RX enable/disable. Internal pull-down resistor
MODE2 13 N/A MODE control pins, Integrated weak pull-down resistor
MODE0 14 14
MODE1 15 15
NC 16, 36 13,16, 18 Not connected internally. Can be connected to supply, ground or left open on PCB
TERM_TX (TERM for Maxlinear devices) 17 17 120Ω Termination enable/disable across R1/R2 terminals. Internal pull down resistor
TERM_RX 18 N/A 120Ω Termination enable/disable across R3/R4 terminals. Internal pull down resistor
SHDN (EN for Maxlinear devices) 19 19 Device enable/disable