MAX3222 3-V to 5.5-V Multichannel RS-232 Line Driver and Receiver With ±15-kV ESD Protection
1 Features
- RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
- Meets or Exceeds the Requirements of
TIA/EIA-232-F and ITU v.28 Standards - Operates With 3-V to 5.5-V VCC Supply
- Operates Up to 250 kbps
- Two Drivers and Two Receivers
- Low Standby Current: 1 µA Typical
- External Capacitors: 4 × 0.1 µF
- Accepts 5-V Logic Input With 3.3-V Supply
- Alternative High-Speed Pin-Compatible Device
(1 Mbps)- SNx5C3222
2 Applications
- Battery-Powered Systems
- PDAs
- Notebooks
- Laptops
- Palmtop PCs
- Hand-held Equipment
3 Description
The MAX3222 consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. The device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver output slew rate.
The MAX3222 can be placed in the power-down mode by setting PWRDOWN low, which draws only 1 μA from the power supply. When the device is powered down, the receivers remain active while the drivers are placed in the high-impedance state. Receiver outputs also can be placed in the high-impedance state by setting EN high.
Device Information(1)
| PART NUMBER | PACKAGE | BODY SIZE (NOM) |
|---|---|---|
| MAX3222CDW, MAX322IDW | SOIC (20) | 12.80 mm × 7.50 mm |
| MAX3222CDB, MAX322IDB | SSOP (20) | 7.20 mm × 5.30 mm |
| MAX3222CPW, MAX322IPW | TSSOP (20) | 6.50 mm × 4.40 mm |
- For all available packages, see the orderable addendum at the end of the data sheet.
Block Diagram
4 Revision History
Changes from G Revision (March 2004) to H Revision
- Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go
- Deleted ODERING INFORMATION table; see POA at the end of the datasheet. Go
- Changed RθJA for DB, DW and PW package from: 70 °C/W to 84.4°C/W (DB), 58 °C/W to 70.2 °C/W (DW) and 83 °C/W to 94.3 °C/W (PW) in the Thermal Information table.Go
5 Pin Configuration and Functions
Pin Functions
| PIN | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| C1+ | 2 | — | Charge pump capacitor pin |
| C1- | 4 | — | Charge pump capacitor pin |
| C2+ | 5 | — | Charge pump capacitor pin |
| C2- | 6 | — | Charge pump capacitor pin |
| DIN1 | 13 | I | Driver logic input |
| DIN2 | 12 | I | Driver logic input |
| DOUT1 | 17 | O | RS-232 driver output |
| DOUT2 | 8 | O | RS-232 driver output |
| EN | 1 | I | Receiver enable, active low |
| GND | 18 | — | Ground |
| NC | 11,14 | — | No internal connection |
| PWRDOWN | 20 | I | Driver disable, active low |
| RIN1 | 16 | I | RS-232 receiver input |
| RIN2 | 9 | I | RS-232 receiver input |
| ROUT1 | 15 | O | Receiver logic output |
| ROUT2 | 10 | O | Receiver logic output |
| VCC | 19 | — | Power Supply |
| V+ | 3 | — | Charge pump capacitor pin |
| V- | 7 | — | Charge pump capacitor pin |
