# SP3221EEY-L

**MaxLinear** · RS232 ICs · TSSOP-16

SP3221EEY-L from MaxLinear, in a TSSOP-16. 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 | EN | input | Receiver enable: apply logic LOW for normal operation, and logic HIGH to disable the receiver output into high-impedance. |
| 2 | C1+ | passive | Positive terminal of the voltage doubler charge-pump capacitor. |
| 3 | V+ | power_out | Regulated +5.5V output generated by the charge pump. |
| 4 | C1- | passive | Negative terminal of the voltage doubler charge-pump capacitor. |
| 5 | C2+ | passive | Positive terminal of the inverting charge-pump capacitor. |
| 6 | C2- | passive | Negative terminal of the inverting charge-pump capacitor. |
| 7 | V- | power_out | Regulated -5.5V output generated by the charge pump. |
| 8 | R1IN | input | RS-232 receiver input, which the datasheet states is pulled down internally through 5kΩ so an unconnected input commits R1OUT to HIGH. |
| 9 | R1OUT | output | TTL/CMOS inverting receiver output, which goes high-impedance when EN is logic HIGH. |
| 10 | STATUS | output | TTL/CMOS output indicating receiver signal activity, which goes LOW when the RS-232 cable is disconnected. |
| 11 | T1IN | input | TTL/CMOS driver input; unused driver inputs should be connected to GND or VCC. |
| 12 | ONLINE | input | Apply logic HIGH to override AUTO ON-LINE circuitry and keep the driver active, with SHUTDOWN also held at logic HIGH. |
| 13 | T1OUT | output | RS-232 driver output, protected against infinite short-circuits to ground. |
| 14 | GND | power_in | Ground reference for the device. |
| 15 | VCC | power_in | Supply voltage input, +3.0V to +5.5V. |
| 16 | SHUTDOWN | input | Apply logic LOW to shut down the drivers and charge pump, overriding all AUTO ON-LINE circuitry and the ONLINE pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MaxLinear |
| Package | TSSOP-16 |
| Category | Interface |
| Pins | 16 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Current, AUTO ON-LINE |  |  | 1 | 10 | µA | RxIN open, ONLINE = GND, SHUTDOWN = Vcc, TxIN = Vcc or GND, Vcc = +3.3V, TAMB = +25ºC | 2 |
| Supply Current, Shutdown |  |  | 1 | 10 | µA | SHUTDOWN = GND, TxIN = Vcc or GND, Vcc = +3.3V, TAMB = +25ºC | 2 |
| Supply Current, AUTO ON-LINE Disabled |  |  | 0.3 | 1 | mA | ONLINE = SHUTDOWN = Vcc, No Load, Vcc = +3.3V, TAMB = +25ºC | 2 |
| Input Logic Threshold HIGH |  | 2 |  |  | V | Vcc = 3.3V or 5.0V, TxIN, EN, SHUTDOWN, ONLINE | 2 |
| Input Logic Threshold LOW |  |  |  | 0.8 | V | Vcc = 3.3V or 5.0V, TxIN, EN, SHUTDOWN, ONLINE | 2 |
| Input Leakage Current |  | -1 | 0.01 | 1 | µA | TAMB = +25ºC, Vin = 0V to Vcc (TxIN, EN, ONLINE, SHUTDOWN) | 2 |
| Output Leakage Current (RxOUT) |  | -10 | 0.05 | 10 | µA | Receiver disabled, Vout = 0V to Vcc | 2 |
| Output Voltage LOW (RxOUT) |  |  |  | 0.4 | V | IOUT = 1.6mA | 2 |
| Output Voltage Swing |  | -5 | 5.4 | 5 | V | Driver output loaded with 3kΩ to GND, TAMB = +25ºC | 3 |
| Output Short-Circuit Current |  | -60 |  | 60 | mA | Vout = 0V | 3 |
| Output Leakage Current (Driver) |  | -25 |  | 25 | µA | Vcc = 0V or 3.0V to 5.5V, Vout = +/-12V, Driver disabled | 3 |
| Input Voltage Range |  | -15 |  | 15 | V |  | 3 |
| Input Threshold LOW |  |  | 0.6 | 1.2 | V | Vcc = 3.3V | 3 |
| Input Threshold LOW |  |  | 0.8 | 1.5 | V | Vcc = 5.0V | 3 |
| Input Threshold HIGH |  |  | 1.5 | 2.4 | V | Vcc = 3.3V | 3 |
| Input Threshold HIGH |  |  | 1.8 | 2.4 | V | Vcc = 5.0V | 3 |
| Input Resistance |  | 3 | 5 | 7 | kΩ |  | 3 |
| STATUS Output Voltage LOW |  |  |  | 0.4 | V | IOUT = 1.6mA | 3 |
| Output Resistance |  | 300 |  |  | Ω | Vcc = V+ = V- = 0V, Vout = +/-2V | 3 |
| Transition-Region Slew Rate |  | 6 |  | 30 | V/µs | Vcc = 3.3V, RL = 3kΩ, CL = 150pF to 1000pF, TAMB = 25°C | 4 |
| Driver Skew | │tPHL - tPLH│ |  | 350 | 800 | ns | RL = 3kΩ, CL = 1000pF | 4 |
| Receiver Skew | │tPHL - tPLH│ |  | 50 | 800 | ns | CL = 150pF | 4 |
| Data Rate |  | 250 |  |  | kbps | RL = 3kΩ, CL = 1000pF | 4 |
| Charge pump capacitor C1 - C4 (minimum) | C1-C4 | 0.22 |  |  | µF | VCC 3.0V to 5.5V | 12 |
| Charge pump capacitor C1 - C4 (minimum) | C1-C4 | 0.1 |  |  | µF | VCC 3.0V to 3.6V | 12 |
| Charge pump capacitor C1 (minimum) | C1 | 0.047 |  |  | µF | VCC 4.5V to 5.5V | 12 |
| Charge pump capacitor C2 - C4 (minimum) | C2-C4 | 0.33 |  |  | µF | VCC 4.5V to 5.5V | 12 |
| Supply voltage | VCC | 3 |  | 5.5 | V | TAMB = TMIN to TMAX | 2 |
| Operating ambient temperature | TAMB | -40 |  | 85 | °C | SP3221EEY-L/TR temperature range per ordering information | 19 |
| Supply voltage (absolute maximum) | VCC | -0.3 |  | 6 | V |  | 2 |
| V+ (Note 1) | V+ | -0.3 |  | 7 | V |  | 2 |
| V- (Note 1) | V- | -7 |  | 0.3 | V |  | 2 |
| V+ + /V-/ (Note 1) | V+ + /V-/ |  |  | 13 | V |  | 2 |
| DC VCC or GND current | ICC |  |  | 100 | mA |  | 2 |
| Input voltage (TxIN, ONLINE, SHUTDOWN, EN) |  | -0.3 |  |  | V | Printed as VCC + 0.3V (expression, max not numeric) | 2 |
| Input voltage (RxIN) |  |  |  | 25 | V |  | 2 |
| Output voltage (TxOUT) |  |  |  | 13.2 | V |  | 2 |
| Output voltage (RxOUT, STATUS) |  | -0.3 |  |  | V | Printed as VCC + 0.3V (expression, max not numeric) | 2 |
| Storage temperature | TSTG | -65 |  | 150 | °C |  | 2 |
| ESD Human Body Model (Driver Output) |  | -15 |  | 15 | kV | MIL-STD-883 Method 3015.7 (1.5kΩ, 100pF) | 16 |
| ESD Human Body Model (Receiver Input) |  | -15 |  | 15 | kV | MIL-STD-883 Method 3015.7 (1.5kΩ, 100pF) | 16 |
| ESD IEC61000-4-2 Air Discharge (Driver Output) |  | -15 |  | 15 | kV | IEC61000-4-2 (330Ω, 150pF) | 16 |
| ESD IEC61000-4-2 Contact Discharge (Driver Output) |  | -8 |  | 8 | kV | IEC61000-4-2 direct contact (330Ω, 150pF) | 16 |
| ESD IEC61000-4-2 Air Discharge (Receiver Input) |  | -15 |  | 15 | kV | IEC61000-4-2 (330Ω, 150pF) | 16 |
| ESD IEC61000-4-2 Contact Discharge (Receiver Input) |  | -8 |  | 8 | kV | IEC61000-4-2 direct contact (330Ω, 150pF) | 16 |
| Receiver Output Enable Time |  |  | 200 |  | ns | Normal Operation | 4 |
| Receiver Output Disable Time |  |  | 200 |  | ns | Normal Operation | 4 |
| Receiver Propagation Delay (tPHL and tPLH) | tPHL, tPLH |  | 0.15 |  | µs | Receiver input to Receiver output, CL = 150pF | 4 |
| Receiver Threshold to Driver Enabled | tONLINE |  | 100 |  | µs | Figure 13 | 3 |
| Receiver Positive or Negative Threshold to STATUS HIGH | tSTSH |  | 0.5 |  | µs | Figure 13 | 3 |
| Receiver Positive or Negative Threshold to STATUS LOW | tSTSL |  | 20 |  | µs | Figure 13 | 3 |
| Input Hysteresis |  |  | 0.3 |  | V |  | 3 |

## CAD (KiCad official)

- Symbol: `SP3221EEY-L`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16 (KiCad packages3D, STEP)
- 3D model files: `sp3221eey-l-etched.step` / `sp3221eey-l-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `sp3221eey-l.step` / `sp3221eey-l.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MaxLinear datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8600658606694424576) (20 pp, sha256 `182ec9acd2ab0c45`, retrieved 2026-10-18, tier: lcsc)
- **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](docs/sp3221eey-l-datasheet.pdf)