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MAX3243CDWR

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Texas Instruments RS232 ICs, SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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MAX3243CDWR

Texas Instruments · RS232 ICs · SOIC-28-300mil

MAX3243CDWR from Texas Instruments, in a SOIC-28-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 C2+ passive Positive lead of the C2 charge-pump capacitor.
2 C2- passive Negative lead of the C2 charge-pump capacitor.
3 V- power_out Negative charge pump output, for the storage capacitor only.
4 RIN1 input RS232 line data input from the remote RS232 system (receiver input, ±25 V range, 3 to 7 kΩ input resistance).
5 RIN2 input RS232 line data input from the remote RS232 system; also drives the always-active ROUT2B output (normally used for ring indicator).
6 RIN3 input RS232 line data input from the remote RS232 system (receiver input, ±25 V range, 3 to 7 kΩ input resistance).
7 RIN4 input RS232 line data input from the remote RS232 system (receiver input, ±25 V range, 3 to 7 kΩ input resistance).
8 RIN5 input RS232 line data input from the remote RS232 system (receiver input, ±25 V range, 3 to 7 kΩ input resistance).
9 DOUT1 output RS232 line data output to the remote RS232 system (±15 kV HBM ESD protected).
10 DOUT2 output RS232 line data output to the remote RS232 system (±15 kV HBM ESD protected).
11 DOUT3 output RS232 line data output to the remote RS232 system (±15 kV HBM ESD protected).
12 DIN3 input Logic data input from the UART; must be driven to a valid high or low level.
13 DIN2 input Logic data input from the UART; must be driven to a valid high or low level.
14 DIN1 input Logic data input from the UART; must be driven to a valid high or low level.
15 ROUT5 output Logic data output to the UART; high-Z when FORCEOFF is low.
16 ROUT4 output Logic data output to the UART; high-Z when FORCEOFF is low.
17 ROUT3 output Logic data output to the UART; high-Z when FORCEOFF is low.
18 ROUT2 output Logic data output to the UART; high-Z when FORCEOFF is low.
19 ROUT1 output Logic data output to the UART; high-Z when FORCEOFF is low.
20 ROUT2B output Always-active non-inverting output for RIN2, normally used for the ring indicator.
21 INVALID output Active-low output when all RIN inputs are unpowered (between -0.3 V and 0.3 V for more than 30 µs).
22 FORCEOFF input Low input forces drivers and receivers (except ROUT2B) to high-Z and overrides FORCEON.
23 FORCEON input High forces drivers on (disables auto-powerdown); low selects automatic mode.
24 C1- passive Negative lead of the C1 charge-pump capacitor.
25 GND power_in Ground (±15 kV HBM ESD protected).
26 VCC power_in Supply voltage, connect to a 3 V to 5.5 V power supply.
27 V+ power_out Positive charge pump output, for the storage capacitor only.
28 C1+ passive Positive lead of the C1 charge-pump capacitor.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-28-300mil
Category Interface
Pins 28

CAD (KiCad official)

  • Symbol: MAX3243CDWR
  • Footprint: Package_SO:SOIC-28W_7.5x17.9mm_P1.27mm
  • 3D model: SOIC-28-300mil (KiCad packages3D, STEP)
  • 3D model files: max3243cdwr-etched.step / max3243cdwr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); max3243cdwr.step / max3243cdwr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (27 pp, sha256 21e5b8a04a566ebb, retrieved 2026-10-11, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF