MAX3232

@@ -0,0 +1,60 @@+# MAX3232++**Texas Instruments** · RS-232 transceiver (3 V) · SOIC-16++A dual RS-232 transceiver in SOIC-16, the low-voltage successor to the MAX232. It converts between a microcontroller's logic-level UART and the plus/minus RS-232 line levels, generating those swings from a single 3 to 5.5 V rail with an on-chip charge pump and four external capacitors, so it bridges a 3.3 V MCU to a PC serial port without a negative supply. It carries two transmit drivers and two receive buffers, enough for TX/RX plus one handshake pair. Pin-compatible with the MAX232 and good to 250 kbit/s.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | C1+ | passive | Positive lead of charge-pump capacitor C1 (typ. 0.1 µF at VCC = 3.3 V, or 0.047 µF at VCC = 5 V). Connect between C1+ and C1- as part of the charge-pump network. |+| 2 | V+ | power_out | Positive charge-pump output for storage capacitor only. Nominally VCC-referenced positive rail generated by the internal charge pump (approx. +5.5 V). Connect a 0.1 µF (or 0.33 µF at 5 V) storage capacitor from V+ to GND. |+| 3 | C1- | passive | Negative lead of charge-pump capacitor C1. Connect between C1+ and C1- as part of the charge-pump network. |+| 4 | C2+ | passive | Positive lead of charge-pump capacitor C2 (typ. 0.1 µF at 3.3 V, or 0.33 µF at 5 V). Connect between C2+ and C2- as part of the inverter charge-pump network. |+| 5 | C2- | passive | Negative lead of charge-pump capacitor C2. Connect between C2+ and C2- as part of the inverter charge-pump network. |+| 6 | V- | power_out | Negative charge-pump output for storage capacitor only. Inverted negative rail (approx. -5.5 V) generated by the internal charge pump. Connect a 0.1 µF (or 0.33 µF at 5 V) storage capacitor from V- to GND. |+| 7 | DOUT2 | output | RS-232 line data output for channel 2 (to remote RS-232 system). Driver output swings between V+ and V- (typ. ±5.4 V), short-circuit protected to ground (Ios ~ ±35 mA). |+| 8 | RIN2 | input | RS-232 line data input for channel 2 (from remote RS-232 system). Includes internal 3-7 kΩ RS-232 load; input voltage range ±25 V. Thresholds: VIT+ typ 1.5-1.8 V, VIT- typ 0.6-0.8 V. |+| 9 | ROUT2 | output | Logic-level data output for channel 2 (to UART). CMOS-level output referenced to VCC; VOH ≥ VCC-0.6 V at IOH = -1 mA, VOL ≤ 0.4 V at IOL = 1.6 mA. Inverted from RIN2; open RIN gives high ROUT. |+| 10 | DIN2 | input | Logic-level data input for channel 2 (from UART). Accepts 3-V or 5-V logic (VIH ≥ 2 V at VCC = 3.3 V, ≥ 2.4 V at VCC = 5 V; VIL ≤ 0.8 V). Input range 0 to 5.5 V; must be driven valid high or low. |+| 11 | DIN1 | input | Logic-level data input for channel 1 (from UART). Accepts 3-V or 5-V logic (VIH ≥ 2 V at VCC = 3.3 V, ≥ 2.4 V at VCC = 5 V; VIL ≤ 0.8 V). Input range 0 to 5.5 V; must be driven valid high or low. |+| 12 | ROUT1 | output | Logic-level data output for channel 1 (to UART). CMOS-level output referenced to VCC; VOH ≥ VCC-0.6 V at IOH = -1 mA, VOL ≤ 0.4 V at IOL = 1.6 mA. Inverted from RIN1; open RIN gives high ROUT. |+| 13 | RIN1 | input | RS-232 line data input for channel 1 (from remote RS-232 system). Includes internal 3-7 kΩ RS-232 load; input voltage range ±25 V. Thresholds: VIT+ typ 1.5-1.8 V, VIT- typ 0.6-0.8 V. |+| 14 | DOUT1 | output | RS-232 line data output for channel 1 (to remote RS-232 system). Driver output swings between V+ and V- (typ. ±5.4 V), short-circuit protected to ground (Ios ~ ±35 mA). |+| 15 | GND | power_in | Device ground reference. All voltages are with respect to this network GND. |+| 16 | VCC | power_in | Supply voltage; connect to external 3 V to 5.5 V power supply (recommended 3.0-3.6 V or 4.5-5.5 V). ICC typical 0.3 mA, max 1 mA at no load. Bypass with 0.1 µF. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Dual RS-232 transceiver |+| Drivers / receivers | 2 / 2 |+| Supply voltage | 3-5.5 V (single) |+| Level generation | on-chip charge pump (4 caps) |+| Data rate | up to 250 kbit/s |+| Compatibility | pin-identical to MAX232 |+| ESD | ±15 kV (line pins) |+| Package | SOIC-16 |++## Ordering variants++- `MAX3232CDR (SOIC-16)`+- `MAX3232IDR (SOIC-16, industrial)`++## CAD (KiCad official)++- Symbol: `Interface_UART:MAX3232`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/max3232.pdf) (30 pp, sha256 `13b1834e8de7c628`, 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/max3232-datasheet.pdf)

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