Overview
The SN75C3221PWR is a single-channel RS-232 line driver/receiver manufactured by Texas Instruments. This device is designed to provide an electrical interface between an asynchronous communication controller and a serial-port connector. It operates with a single 3-V to 5.5-V supply and includes a dual charge-pump circuit that generates the necessary voltage levels for RS-232 communication. The device features high-speed data transmission up to 1 Mbit/s and includes robust ESD protection exceeding ±15 kV using the human-body model (HBM).
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 3 to 5.5 | V |
| Operating Temperature Range | 0 to 70 | °C |
| Data Signaling Rate | Up to 1 Mbit/s | |
| Standby Current | 1 µA (typical) | µA |
| External Capacitors | 4 x 0.1 µF | |
| ESD Protection | ±15 kV (HBM) | V |
| Package Type | TSSOP (PW) 16 pins | |
| Driver Output Slew Rate | 24 V/µs to 150 V/µs |
Key Features
- Operates with 3-V to 5.5-V VCC supply.
- Supports data signaling rates up to 1 Mbit/s.
- Low standby current: 1 µA typical.
- Accepts 5-V logic input with 3.3-V supply.
- RS-232 bus-pin ESD protection exceeds ±15 kV using human-body model (HBM).
- Auto-powerdown feature automatically disables drivers for power savings.
Applications
- Battery-powered, hand-held, and portable equipment.
- PDAs and palmtop PCs.
- Notebooks, sub-notebooks, and laptops.
- Digital cameras.
- Mobile phones and wireless devices.
- Industrial PCs.
- Wired networking.
- Data center and enterprise computing.
Q & A
- What is the operating voltage range of the SN75C3221PWR?
The SN75C3221PWR operates with a supply voltage (VCC) ranging from 3 V to 5.5 V.
- What is the maximum data signaling rate supported by the SN75C3221PWR?
The device supports data signaling rates up to 1 Mbit/s.
- What is the typical standby current of the SN75C3221PWR?
The typical standby current is 1 µA.
- Does the SN75C3221PWR support 5-V logic input with a 3.3-V supply?
Yes, it accepts 5-V logic input with a 3.3-V supply.
- What level of ESD protection does the SN75C3221PWR offer?
The device offers ESD protection exceeding ±15 kV using the human-body model (HBM).
- How does the auto-powerdown feature work in the SN75C3221PWR?
The auto-powerdown feature automatically disables drivers for power savings when the serial port is inactive. It can be controlled using the FORCEON and FORCEOFF pins.
- What is the purpose of the INVALID output pin in the SN75C3221PWR?
The INVALID output pin notifies the user if an RS-232 signal is present at the receiver input. It is high for valid data and low for invalid data.
- What type of package is the SN75C3221PWR available in?
The SN75C3221PWR is available in a TSSOP (PW) package with 16 pins.
- What are some common applications for the SN75C3221PWR?
Common applications include battery-powered devices, PDAs, notebooks, digital cameras, and mobile phones.
- How does the charge pump circuit in the SN75C3221PWR work?
The charge pump circuit generates the necessary voltage levels for RS-232 communication using four small external capacitors.
