Overview
The DS8921MX/NOPB is a differential line driver and receiver pair produced by Texas Instruments. This device is specifically designed to meet the requirements of the EIA standard RS-422 and is compatible with ST506, ST412, and ESDI disk drive standards. It is housed in an 8-pin SOIC (D) package and operates within a temperature range of 0°C to 70°C, with the DS8921AT variant extending this range to -40°C to +85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC (D), 8 pins |
| Operating Temperature Range | 0°C to 70°C (DS8921, DS8921A), -40°C to +85°C (DS8921AT) |
| Supply Voltage | 4.5V to 5.5V |
| ICC (Max) | 35 mA |
| Signaling Rate | 10 Mbps |
| Receiver Input Sensitivity | ±200 mV |
| Receiver Hysteresis | 70 mV typical |
| Propagation Delay | 12 ns typical |
| Output Skew | 0.5 ns typical |
| Common-Mode Input Voltage Range | ±7 V |
| RoHS Status | Compliant |
Key Features
- Meets the requirements of EIA standard RS-422.
- Complementary driver outputs for differential drive to twisted-pair or parallel wire transmission lines.
- High differential or common-mode input voltage ranges of ±7 V.
- Receiver input sensitivity of ±200 mV over the input voltage range.
- Receiver input hysteresis of 70 mV typical to improve noise margin.
- Propagation delay of 12 ns typical and output skew of 0.5 ns typical.
- Compatible with TTL and CMOS inputs.
Applications
The DS8921MX/NOPB is designed for various applications, including:
- ST506, ST412, and ESDI disk drive standards.
- RS-422 interface applications.
- Differential signal transmission across long transmission lines, especially in environments with ground reference differences or noisy conditions.
Q & A
- What is the primary function of the DS8921MX/NOPB?
The DS8921MX/NOPB is a differential line driver and receiver pair designed for applications meeting RS-422 and various disk drive standards.
- What is the operating temperature range of the DS8921MX/NOPB?
The operating temperature range is 0°C to 70°C for the DS8921 and DS8921A, and -40°C to +85°C for the DS8921AT.
- What is the supply voltage range for the DS8921MX/NOPB?
The supply voltage range is 4.5V to 5.5V.
- What is the maximum ICC for the DS8921MX/NOPB?
The maximum ICC is 35 mA.
- What is the signaling rate of the DS8921MX/NOPB?
The signaling rate is up to 10 Mbps.
- What is the receiver input sensitivity of the DS8921MX/NOPB?
The receiver input sensitivity is ±200 mV.
- What is the typical propagation delay of the DS8921MX/NOPB?
The typical propagation delay is 12 ns.
- Is the DS8921MX/NOPB RoHS compliant?
- What type of package does the DS8921MX/NOPB come in?
The DS8921MX/NOPB comes in an 8-pin SOIC (D) package.
- What are some typical applications of the DS8921MX/NOPB?
Typical applications include ST506, ST412, and ESDI disk drive standards, as well as RS-422 interface applications.
