Overview
The MAX202CDRE4, produced by Texas Instruments, is a 5-V dual RS-232 line driver and receiver. This device is designed to meet or exceed the requirements of TIA/EIA-232-F and ITU v.28 standards, providing a reliable electrical interface between an asynchronous communication controller and the serial-port connector. The MAX202 features a dual charge-pump circuit that allows operation from a single 5V supply, utilizing four small external capacitors. It includes two line drivers and two line receivers, with each receiver capable of converting RS-232 inputs to 5V TTL/CMOS levels and each driver converting TTL/CMOS input levels to RS-232 levels. The device also boasts ±15kV ESD protection for RS-232 bus pins, enhancing its durability and reliability in various applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | 4.5 to 5.5 | V |
| Data Signaling Rate | Up to 120 | kbit/s |
| Driver Output Slew Rate | Up to 30 | V/µs |
| ESD Protection (RS-232 Bus Pins) | ±15kV | HBM |
| Package Types | SOIC (16), SOIC WIDE (16), TSSOP (16) | |
| Package Size (Nominal) | SOIC: 9.9mm × 6mm, SOIC WIDE: 10.4mm × 10.3mm, TSSOP: 5mm x 6.4mm | |
| Propagation Delay Time (Driver) | 2 µs (typical) |
Key Features
- Meets or exceeds TIA/EIA-232-F and ITU v.28 standards
- Operates at 5V VCC supply
- Two drivers and two receivers
- ±15kV ESD protection for RS-232 bus pins (human-body model)
- Latch-up performance exceeds 100mA per JESD 78, Class II
- Shorted and open fail-safe receivers
- Receivers can accept up to ±30V inputs and decode inputs as low as ±3V
- Drivers protected against shorts to ground
Applications
- Battery-powered systems
- Notebooks and laptops
- Palmtop PCs
- Hand-held equipment
Q & A
- What are the key standards that the MAX202 complies with?
The MAX202 meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards.
- What is the operating voltage range for the MAX202?
The MAX202 operates with a supply voltage (VCC) range of 4.5V to 5.5V.
- What is the maximum data signaling rate supported by the MAX202?
The MAX202 supports data signaling rates up to 120 kbit/s.
- What level of ESD protection does the MAX202 offer?
The MAX202 provides ±15kV ESD protection for RS-232 bus pins according to the human-body model.
- How many drivers and receivers does the MAX202 have?
The MAX202 includes two line drivers and two line receivers.
- What types of packages are available for the MAX202?
The MAX202 is available in SOIC (16), SOIC WIDE (16), and TSSOP (16) packages.
- What is the purpose of the charge-pump circuit in the MAX202?
The charge-pump circuit increases and inverts the 5V supply for the RS-232 driver, allowing operation from a single 5V supply using four external capacitors.
- How do the receivers in the MAX202 handle open or shorted inputs?
The receivers have shorted and open fail-safe features, ensuring a high output on ROUT if the input is open or disconnected.
- What is the recommended capacitor value for the charge-pump circuit?
The MAX202 requires 0.1µF capacitors, but capacitors up to 10µF can be used without harm.
- What are some common applications for the MAX202?
The MAX202 is commonly used in battery-powered systems, notebooks, laptops, palmtop PCs, and hand-held equipment.
