Overview
The DS89C21TMX/NOPB is a differential CMOS line driver and receiver pair designed by Texas Instruments. This device is compliant with the TIA/EIA-422-A (RS-422) and CCITT V.11 electrical interface standards. It features a low-power design, making it suitable for battery-powered or power-conscious applications. The DS89C21 is offered in an 8-pin SOIC package and operates over a wide temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.50 | 5.00 | 5.50 | V |
| Operating Temperature (TA) | -40 | +85 | °C | |
| Driver Input Voltage (DI) | -1.5 | VCC + 1.5 | V | |
| Driver Output Voltage (DO, DO*) | -0.5 | +7 | V | |
| Receiver Input Voltage (RI, RI*) | -14 | +14 | V | |
| Receiver Output Voltage (RO) | -0.5 | VCC + 0.5 | V | |
| Driver Propagation Delay (tPLHD, tPHLD) | 2 | 4.5-4.9 | 10 | ns |
| Receiver Propagation Delay (tPLH, tPHL) | 6 | 17.5-18 | 30 | ns |
| Driver Skew (tSKD) | 0.4 | 2.0 | ns | |
| Receiver Skew (tSK) | 0.5 | 4.0 | ns | |
| Supply Current (ICC) | 3.0 | 6 | 12 | mA |
Key Features
- Meets TIA/EIA-422-A (RS-422) and CCITT V.11 electrical interface standards.
- Low power design with a typical supply current of 6 mA.
- Fast transition times: 2.2 ns for driver and 2.5 ns for receiver.
- Maximum differential skew of 2 ns for the driver and 4 ns for the receiver.
- Extended temperature range: -40°C to +85°C.
- Available in 8-pin SOIC packaging.
- Receiver OPEN input failsafe feature.
- Hysteresis for noise rejection in the receiver.
- Compatible with TTL and CMOS levels.
Applications
- High-speed data transmission systems.
- Battery-powered devices and power-conscious applications.
- Industrial control systems.
- Telecommunications equipment.
- Point-to-point and multi-point data communication networks.
Q & A
- What is the DS89C21TMX/NOPB used for?
The DS89C21TMX/NOPB is a differential CMOS line driver and receiver pair used for high-speed data transmission in compliance with TIA/EIA-422-A (RS-422) and CCITT V.11 standards.
- What is the operating temperature range of the DS89C21TMX/NOPB?
The device operates over a temperature range of -40°C to +85°C.
- What is the typical supply current of the DS89C21TMX/NOPB?
The typical supply current is 6 mA.
- What is the maximum differential skew for the driver and receiver?
The maximum differential skew is 2 ns for the driver and 4 ns for the receiver.
- What packaging options are available for the DS89C21TMX/NOPB?
The device is available in an 8-pin SOIC package.
- Does the DS89C21TMX/NOPB have any failsafe features?
Yes, the receiver has an OPEN input failsafe feature.
- Is the DS89C21TMX/NOPB compatible with TTL and CMOS levels?
Yes, it is compatible with both TTL and CMOS levels.
- What are the typical transition times for the driver and receiver?
The typical transition times are 2.2 ns for the driver and 2.5 ns for the receiver.
- What is the maximum data rate supported by the DS89C21TMX/NOPB?
The device can operate at data rates up to 20 Mbps.
- Is the DS89C21TMX/NOPB still in production?
No, the DS89C21 has been discontinued by Texas Instruments, but existing stock may still be available from distributors.
