# MAX3227ECAE+T

**Maxim Integrated** · Pre-ordered Chips · SSOP-16-208mil

MAX3227ECAE+T from Maxim Integrated, in a SSOP-16-208mil. 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 | READY | output | Ready to Transmit output, active-high; READY goes high when V- goes below -4V and the device is ready to transmit. |
| 2 | C1+ | passive | Positive terminal of the voltage-doubler charge-pump capacitor. |
| 3 | V+ | power_out | +5.5V 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 | -5.5V generated by the charge pump. |
| 8 | R1IN | input | RS-232 receiver input; R_IN to GND is rated at ±25V absolute maximum. |
| 9 | R1OUT | output | TTL/CMOS receiver output. |
| 10 | INVALID | output | Valid signal detector output, active low; a logic high indicates that a valid RS-232 level is present on a receiver input. |
| 11 | T1IN | input | TTL/CMOS transmitter input; the inputs have no pullup resistors, so unused inputs should be connected to GND or VCC. |
| 12 | FORCEON | input | Force-On input, active-high; drive high to override AutoShutdown Plus, keeping transmitters and receivers on (FORCEOFF must be high). |
| 13 | T1OUT | output | RS-232 transmitter output; T_OUT is rated ±13.2V to GND and the outputs go high-impedance when disabled, and can be driven to ±12V when powered off or shut down. |
| 14 | GND | power_in | Ground. |
| 15 | VCC | power_in | Single supply voltage, +3.0V to +5.5V. |
| 16 | FORCEOFF | input | Force-Off input, active-low; when low, transmitters are in high impedance, charge pumps are shut down, and receivers are active, overriding AutoShutdown Plus and FORCEON. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Maxim Integrated |
| Package | SSOP-16-208mil |
| Category | Interface ICs |
| 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, AutoShutdown Plus |  |  | 1 | 10 | μA | FORCEON = GND, FORCEOFF = VCC, all R_IN idle, all T_IN idle | 6 |
| Supply Current, Shutdown |  |  | 1 | 10 | μA | FORCEOFF = GND | 6 |
| Supply Current, AutoShutdown Plus Disabled |  |  | 0.3 | 1 | mA | FORCEON = FORCEOFF = VCC, no load | 6 |
| Input Logic Threshold Low |  |  |  | 0.8 | V | T_IN, FORCEON, FORCEOFF | 6 |
| Input Logic Threshold High |  | 2 |  |  | V | VCC = 3.3V | 6 |
| Input Logic Threshold High |  | 2.4 |  |  | V | VCC = 5.0V | 6 |
| Input Leakage Current |  | -1 | 0.01 | 1 | μA | T_IN, FORCEON, FORCEOFF | 6 |
| Output Voltage Low (R_OUT) |  |  |  | 0.4 | V | IOUT = 1.6mA | 6 |
| Output Voltage Low (INVALID, READY) |  |  |  | 0.4 | V | IOUT = -1.6mA | 7 |
| Input Voltage Range |  | -25 |  | 25 | V |  | 6 |
| Input Threshold Low |  | 0.6 | 1.2 |  | V | TA = +25°C, VCC = 3.3V | 6 |
| Input Threshold Low |  | 0.8 | 1.5 |  | V | TA = +25°C, VCC = 5.0V | 6 |
| Input Threshold High |  | 1.5 | 2.4 |  | V | TA = +25°C, VCC = 3.3V | 6 |
| Input Threshold High |  | 1.8 | 2.4 |  | V | TA = +25°C, VCC = 5.0V | 6 |
| Input Resistance |  | 3 | 5 | 7 | kΩ | TA = +25°C | 6 |
| Output Voltage Swing |  | -5 | 5.4 | 5 | V | All transmitter outputs loaded with 3kΩ to ground | 6 |
| Output Resistance |  | 300 |  |  | Ω | VCC = V+ = V- = 0V, transmitter outputs = ±2V | 6 |
| Output Resistance |  |  |  | 10 | MΩ | VCC = V+ = V- = 0V, transmitter outputs = ±2V | 6 |
| Output Short-Circuit Current |  | -60 |  | 60 | mA |  | 6 |
| Output Leakage Current (transmitter outputs) |  | -25 |  | 25 | µA | VCC = 0V or 3V to 5.5V, VOUT = ±12V, Transmitters disabled | 6 |
| ESD IEC 1000-4-2 Air Discharge (R_IN, T_OUT) |  | -15 |  | 15 | kV |  | 7 |
| ESD IEC 1000-4-2 Contact Discharge (R_IN, T_OUT) |  | -8 |  | 8 | kV |  | 7 |
| ESD Human Body Model (R_IN, T_OUT) |  | -15 |  | 15 | kV |  | 7 |
| Receiver Input Threshold to INVALID Output Low |  | -0.3 |  | 0.3 | V | FORCEON = GND, FORCEOFF = VCC, Figure 4a | 7 |
| Receiver Positive or Negative Threshold to INVALID High | tINVH |  |  | 1 | μs | VCC = 5V, Figure 4b | 7 |
| Receiver Positive or Negative Threshold to INVALID Low | tINVL |  |  | 30 | μs | VCC = 5V, Figure 4b | 7 |
| Receiver or Transmitter Edge to Transmitters Enabled | tWU |  |  | 100 | μs | VCC = 5V, Figure 5b (Note 2) | 7 |
| Receiver or Transmitter Edge to Transmitters Shutdown | tAUTOSHDN | 15 | 30 | 60 | s | VCC = 5V, Figure 5b (Note 2) | 7 |
| Maximum Data Rate |  | 1000 |  |  | kbps | VCC = 3.0V to 4.5V, RL = 3kΩ, CL = 250pF, one transmitter switching | 8 |
| Receiver Propagation Delay | tPHL |  |  | 0.15 | μs | R_IN to R_OUT, CL = 150pF | 8 |
| Transmitter Skew | │tPHL - tPLH│ |  |  | 25 | ns | Note 3 | 8 |
| Receiver Skew | │tPHL - tPLH│ |  |  | 50 | ns |  | 8 |
| Transition-Region Slew Rate |  | 24 |  | 150 | V/μs | VCC = 3.3V, TA = +25°C, RL = 3kΩ to 7kΩ, CL = 150pF to 1000pF, measured from +3V to -3V or -3V to +3V, one transmitter switching | 8 |
| VCC to GND | VCC | -0.3 |  | 6 | V |  | 2 |
| V+ to GND | V+ | -0.3 |  | 7 | V | Note 1 | 2 |
| V- to GND | V- | -7 |  | 0.3 | V | Note 1 | 2 |
| V+ + /V-/ |  |  |  | 13 | V | Note 1 | 2 |
| Input Voltages T_IN, FORCEON, FORCEOFF to GND |  | -0.3 |  | 6 | V |  | 2 |
| Input Voltage R_IN to GND |  | -25 |  | 25 | V |  | 2 |
| Output Voltage T_OUT to GND |  | -13.2 |  | 13.2 | V |  | 2 |
| Output Voltage R_OUT, INVALID, READY to GND |  | -0.3 |  |  | V |  | 2 |
| Storage Temperature Range |  | -65 |  | 160 | °C |  | 2 |
| Lead Temperature (soldering, 10s) |  |  |  | 300 | °C | soldering, 10s | 2 |
| Soldering Temperature (reflow) |  |  |  | 260 | °C |  | 2 |
| Supply Voltage (VCC) | VCC | 3 |  | 5.5 | V |  | 6 |
| Operating Temperature Range (EC) | TA | 0 |  | 70 | °C | MAX32__EC__ grade | 2 |
| Input Hysteresis (transmitter input) |  |  | 0.5 |  | V |  | 6 |
| Receiver Input Threshold to INVALID Output High (positive) |  |  | 2.7 |  | V | FORCEON = GND, FORCEOFF = VCC, Figure 4a | 7 |
| Receiver Input Threshold to INVALID Output High (negative) |  |  | -2.7 |  | V | FORCEON = GND, FORCEOFF = VCC, Figure 4a | 7 |
| Thermal Resistance Junction to Ambient (θJA) | θJA |  | 140 |  | °C/W | Single layer board, 16-SSOP | 2 |
| Thermal Resistance Junction to Case (θJC) | θJC |  | 34 |  | °C/W | Single layer board, 16-SSOP | 2 |
| Thermal Resistance Junction to Ambient (θJA) | θJA |  | 86 |  | °C/W | Four-layer board, 16-SSOP | 2 |
| Thermal Resistance Junction to Case (θJC) | θJC |  | 33 |  | °C/W | Four-layer board, 16-SSOP | 2 |

## CAD (KiCad official)

- Symbol: `MAX3227ECAE+T`
- Footprint: `Package_SO:SSOP-16_5.3x6.2mm_P0.65mm`
- 3D model: SSOP-16-208mil (KiCad packages3D, STEP)
- 3D model files: `max3227ecae-t-etched.step` / `max3227ecae-t-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `max3227ecae-t.step` / `max3227ecae-t.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Maxim Integrated datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/max3224e-max3245e.pdf) (25 pp, sha256 `8542587c6f3a36a5`, retrieved 2026-10-31, tier: manufacturer)
- **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/max3227ecae-t-datasheet.pdf)