MAX3243CDBR

@@ -0,0 +1,81 @@+# MAX3243CDBR++**Texas Instruments** · RS232 ICs · SSOP-28++MAX3243CDBR from Texas Instruments, in a SSOP-28. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | C2+ | passive | Positive lead of C2 charge-pump flying capacitor (0.1 µF at Vcc = 3.3 V; 0.33 µF at Vcc = 5 V). |+| 2 | C2- | passive | Negative lead of C2 charge-pump flying capacitor. |+| 3 | V- | power_out | Negative charge-pump output for storage capacitor only (approximately -5.5 V). Bypass to GND with a 0.1-0.33 µF capacitor. |+| 4 | RIN1 | input | RS-232 receiver 1 line data input from remote RS-232 system. Input voltage range ±25 V; input resistance 3-7 kΩ. |+| 5 | RIN2 | input | RS-232 receiver 2 line data input from remote RS-232 system. Feeds both ROUT2 (gated by FORCEOFF) and the always-active ROUT2B (ring-indicator). |+| 6 | RIN3 | input | RS-232 receiver 3 line data input from remote RS-232 system. |+| 7 | RIN4 | input | RS-232 receiver 4 line data input from remote RS-232 system. |+| 8 | RIN5 | input | RS-232 receiver 5 line data input from remote RS-232 system. |+| 9 | DOUT1 | output | RS-232 line data output 1 (to remote RS-232 system). Typical VOH = 5.4 V, VOL = -5.4 V into RL = 3 kΩ. High-Z when FORCEOFF is low. |+| 10 | DOUT2 | output | RS-232 line data output 2 (to remote RS-232 system). High-Z when FORCEOFF is low. |+| 11 | DOUT3 | output | RS-232 line data output 3 (to remote RS-232 system). High-Z when FORCEOFF is low. |+| 12 | DIN3 | input | Logic-level data input 3 from UART (drives DOUT3). Accepts 3-V logic on Vcc = 3.3 V and 5-V logic on Vcc = 3.3-5.5 V. |+| 13 | DIN2 | input | Logic-level data input 2 from UART (drives DOUT2). |+| 14 | DIN1 | input | Logic-level data input 1 from UART (drives DOUT1). |+| 15 | ROUT5 | output | Logic-level data output 5 to UART (from RIN5). Gated to high-Z by FORCEOFF/auto-powerdown. |+| 16 | ROUT4 | output | Logic-level data output 4 to UART (from RIN4). Gated to high-Z by FORCEOFF/auto-powerdown. |+| 17 | ROUT3 | output | Logic-level data output 3 to UART (from RIN3). Gated to high-Z by FORCEOFF/auto-powerdown. |+| 18 | ROUT2 | output | Logic-level data output 2 to UART (from RIN2). Gated to high-Z by FORCEOFF/auto-powerdown. |+| 19 | ROUT1 | output | Logic-level data output 1 to UART (from RIN1). Gated to high-Z by FORCEOFF/auto-powerdown. |+| 20 | ROUT2B | output | Always-active non-inverting logic output for RIN2, typically used as a ring-indicator that stays live during auto-powerdown so a wake-on-ring can be detected. |+| 21 | INVALID | output | Active-low status output; asserts low when all RIN inputs are unpowered/idle (no valid RS-232 signal). Used to trigger auto-powerdown of drivers. |+| 22 | FORCEOFF | input | Active-low driver disable. Low forces DOUT1-3 and ROUT1-5 to high-Z per device functional modes. Tie high (or to Vcc) for normal operation. |+| 23 | FORCEON | input | Driver force-on control. High forces drivers on unconditionally; low selects automatic power-down mode (driven by INVALID). |+| 24 | C1- | passive | Negative lead of C1 charge-pump flying capacitor (0.047 µF at Vcc = 3.3 V; 0.1 µF at Vcc = 5 V). |+| 25 | GND | power_in | Device ground reference (0 V). |+| 26 | VCC | power_in | Supply voltage input; 3 V to 5.5 V (recommended 3.0-3.6 V at 3.3-V rail or 4.5-5.5 V at 5-V rail). Bypass with 0.1 µF to GND. |+| 27 | V+ | power_out | Positive charge-pump output for storage capacitor only (approximately +5.5 V). Bypass to GND with 0.1-0.33 µF capacitor. |+| 28 | C1+ | passive | Positive lead of C1 charge-pump flying capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | SSOP-28 |+| Category | Interface |+| Pins | 28 |++## Ordering variants++- `MAX3243CDBRDW`+- `MAX3243CDBRCDW`+- `MAX3243CDBRIDW`+- `MAX3243CDBRCDWR`+- `MAX3243CDBRIDWR`+- `MAX3243CDBRDB`+- `MAX3243CDBRCDB`+- `MAX3243CDBRIDB`+- `MAX3243CDBRCDBR`+- `MAX3243CDBRIDBR`+- `MAX3243CDBRPW`+- `MAX3243CDBRCPW`+- `MAX3243CDBRIPW`+- `MAX3243CDBRCPWR`+- `MAX3243CDBRIPWR`++## CAD (KiCad official)++- Symbol: `MAX3243CDBR`+- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`+- 3D model: SSOP-28 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/max3243cdbr.pdf) (31 pp, sha256 `71f52706280573a4`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/max3243cdbr-datasheet.pdf)