SP3243EUEA-L

@@ -0,0 +1,85 @@+# SP3243EUEA-L++**MaxLinear** · RS232 ICs · SSOP-28-208mil++SP3243EUEA-L from MaxLinear, in a SSOP-28-208mil. 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 terminal of the inverting charge-pump flying capacitor (C2 = 0.1µF between C2+ and C2-). |+| 2 | C2- | passive | Negative terminal of the inverting charge-pump flying capacitor. |+| 3 | V- | power_out | Regulated -5.5V output generated by the internal charge pump. Bypass with a 0.1µF capacitor to GND. |+| 4 | R1IN | input | RS-232 receiver 1 input (±25V tolerant). Internally pulled to GND through ~5kΩ. Accepts RS-232 line levels and produces a TTL/CMOS level on R1OUT. |+| 5 | R2IN | input | RS-232 receiver 2 input. Complementary always-active receiver - its /R2OUT stays alert during shutdown to monitor an external device (e.g. modem Ring Indicate). |+| 6 | R3IN | input | RS-232 receiver 3 input (±25V tolerant, ~5kΩ to GND). |+| 7 | R4IN | input | RS-232 receiver 4 input (±25V tolerant, ~5kΩ to GND). |+| 8 | R5IN | input | RS-232 receiver 5 input (±25V tolerant, ~5kΩ to GND). |+| 9 | T1OUT | output | RS-232 driver 1 output - ±5V-class RS-232 line driver output, slew-rate limited. High-impedance in shutdown. |+| 10 | T2OUT | output | RS-232 driver 2 output. |+| 11 | T3OUT | output | RS-232 driver 3 output. |+| 12 | T3IN | input | TTL/CMOS driver 3 input. |+| 13 | T2IN | input | TTL/CMOS driver 2 input. |+| 14 | T1IN | input | TTL/CMOS driver 1 input. |+| 15 | R5OUT | output | TTL/CMOS receiver 5 output. High-impedance in shutdown. |+| 16 | R4OUT | output | TTL/CMOS receiver 4 output. |+| 17 | R3OUT | output | TTL/CMOS receiver 3 output. |+| 18 | R2OUT | output | TTL/CMOS receiver 2 output (main, tri-stated in shutdown). |+| 19 | R1OUT | output | TTL/CMOS receiver 1 output. High-impedance in shutdown. |+| 20 | /R2OUT | output | Non-inverting complementary R2 output that remains active in shutdown - used to monitor an external device (e.g. modem Ring Indicate) while the transceiver is powered down. |+| 21 | /STATUS | output | TTL/CMOS status output indicating online and shutdown state of the transceiver. Drives a microprocessor supervisory circuit. |+| 22 | /SHUTDOWN | input | Active-low shutdown input. Logic LOW disables drivers and charge pump (Icc drops to <1µA); overrides AUTO ON-LINE and /ONLINE. Tie to VCC for normal operation. |+| 23 | /ONLINE | input | Active-low ONLINE input. Logic HIGH overrides AUTO ON-LINE circuitry and keeps the drivers active (with /SHUTDOWN also HIGH). Logic LOW re-enables AUTO ON-LINE operation. |+| 24 | C1- | passive | Negative terminal of the voltage-doubler charge-pump flying capacitor (C1 = 0.1µF between C1+ and C1-). |+| 25 | GND | power_in | Device ground reference. |+| 26 | VCC | power_in | Positive supply, +3.0V to +5.5V. Bypass with 0.1µF to GND. |+| 27 | V+ | power_out | Regulated +5.5V output generated by the internal charge pump. Bypass with a 0.1µF capacitor to GND. |+| 28 | C1+ | passive | Positive terminal of the voltage-doubler charge-pump flying capacitor. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | MaxLinear |+| Package | SSOP-28-208mil |+| Category | Interface |+| Pins | 28 |++## Ordering variants++- `SP3243EUEA-L/TR`+- `SP3243EUEA-LSP3243EEA-L`+- `SP3243EUEA-LSP3243EEA-L/TR`+- `SP3243EUEA-LSP3243ECA-L`+- `SP3243EUEA-LSP3243ECA-L/TR`+- `SP3243EUEA-LSP3243EBEA-L/TR`+- `SP3243EUEA-LSP3243EHEA-L/TR`+- `SP3243EUEA-LSP3243EUCA-L/TR`+- `SP3243EUEA-LSP3243EBCA-L/TR`+- `SP3243EUEA-LSP3243EHCA-L/TR`+- `SP3243EUEA-LSP3243EUEY-L/TR`+- `SP3243EUEA-LSP3243EEY-L`+- `SP3243EUEA-LSP3243EEY-L/TR`+- `SP3243EUEA-LSP3243ECY-L/TR`+- `SP3243EUEA-LSP3243EBEY-L`+- `SP3243EUEA-LSP3243EBEY-L/TR`+- `SP3243EUEA-LSP3243EBCY-L/TR`+- `SP3243EUEA-LSP3243EUCY-L/TR`+- `SP3243EUEA-LSP3243EUER-L/TR`++## CAD (KiCad official)++- Symbol: `SP3243EUEA-L`+- Footprint: `Package_SO:SSOP-28_5.3x10.2mm_P0.65mm`+- 3D model: SSOP-28-208mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [MaxLinear datasheet](docs/sp3243euea-l-datasheet.pdf) (30 pp, sha256 `ee87c4d95d30c448`, 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/sp3243euea-l-datasheet.pdf)