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Texas Instruments DS89C21TMX/NOPB
- Part No.:
- DS89C21TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS89C21TMX/NOPB.pdf
- Description:
- IC TRANSCEIVER FULL 1/1 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,586
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Product details
Overview
DS89C21TMX/NOPB from Texas Instruments is a differential CMOS line driver and receiver pair compliant with TIA/EIA-422-A (RS-422) and CCITT V.11 standards, operating at up to 20 Mbps with 2.2 ns driver transition time, 2.0 ns max driver skew, and −40°C to +85°C temperature range. It integrates one driver and one receiver in an 8-pin SOIC package for high-speed industrial serial communication links.
For engineers reviewing the DS89C21TMX/NOPB datasheet, DS89C21TMX/NOPB pinout, DS89C21TMX/NOPB application, or DS89C21TMX/NOPB equivalent, key selection criteria include RS-422 compliance, low-power 6 mA supply current, failsafe open-input receiver, TTL/CMOS logic compatibility, and guaranteed AC timing specs including 4.0 ns max receiver skew.
Technical Context
The DS89C21TMX/NOPB implements a single-ended-to-differential driver stage with complementary DO/DO* outputs and a differential-to-single-ended receiver with RO output, both sharing a common 4.5–5.5 V supply. Its receiver incorporates 20–50 mV hysteresis and detects differential inputs as low as ±200 mV, enabling robust noise immunity in electrically noisy environments.
Driver propagation delay is specified from 2–10 ns (tPLHD/tPHLD), with skew bounded at ≤2.0 ns; receiver propagation delay spans 6–30 ns (tPLH/tPHL) with ≤4.0 ns skew. The device supports open-circuit failsafe behavior (RO = HIGH when RI–RI* is unterminated), eliminating need for external biasing resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface Standard | TIA/EIA-422-A (RS-422) and CCITT V.11 compliant - ensures interoperability with standard differential serial transceivers |
| Max Data Rate | 20 Mbps - supports high-speed point-to-point or multi-drop serial links without signal integrity degradation |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V logic rails and tolerant of typical power rail variation |
| Driver Skew | ≤2.0 ns - guarantees tight timing alignment between complementary outputs for clean differential signaling |
| Receiver Skew | ≤4.0 ns - maintains consistent timing between rising/falling edge detection for reliable data recovery |
| Input Threshold | ±200 mV differential - enables detection of small-swing signals over long cables or high-impedance lines |
| Failsafe Behavior | RO = HIGH on open input - prevents floating receiver output in unterminated or disconnected bus conditions |
Pinout & Package
DS89C21TMX/NOPB is housed in an 8-pin SOIC (Package D, JEDEC MS-012 AA), 3.9 mm body width, 1.75 mm max height, with gull-wing leads and pin 1 identifier in quadrant Q1 per tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DI) | Driver Input | TTL/CMOS-compatible single-ended logic input controlling DO/DO* differential output state |
| 2 (GND) | Ground Reference | Common return path for driver and receiver circuitry; must be low-impedance for noise control |
| 3 (DO) | Driver Output (+) | Positive-side differential output; swings 4.2–6.0 V unloaded, 2.0–3.0 V into 100 Ω |
| 4 (DO*) | Driver Output (−) | Negative-side differential output; complementary to DO with ≤2.0 ns skew |
| 5 (RI*) | Receiver Input (−) | Inverting differential input; accepts ±14 V common-mode range and ±14 V differential voltage |
| 6 (RI) | Receiver Input (+) | Non-inverting differential input; paired with RI* for 200 mV threshold detection and hysteresis |
| 7 (RO) | Receiver Output | Single-ended TTL/CMOS-compatible output; HIGH when VDIFF ≥ +200 mV or input open |
| 8 (VCC) | Power Supply | +4.5 V to +5.5 V supply; draws 3.0–12 mA depending on input logic state and load |
Key Features
| Feature | Design Value |
|---|---|
| Differential RS-422 Compliance | Meets full TIA/EIA-422-A electrical requirements - enables drop-in replacement in legacy industrial serial interfaces |
| Low-Power CMOS Design | 6 mA typical ICC at no load - extends battery life in portable instrumentation and reduces thermal load in dense PCB layouts |
| Guaranteed Timing Performance | 2.0 ns max driver skew and 4.0 ns max receiver skew - ensures deterministic setup/hold margins in high-speed synchronous systems |
| Failsafe Receiver Input | RO asserts HIGH when RI–RI* is open - eliminates need for external pull-up/pull-down resistors in unconnected or hot-swap scenarios |
| Wide Common-Mode Range | ±14 V receiver input common-mode tolerance - supports operation across noisy ground potentials in factory automation and motor drive systems |
Applications
| Industrial PLC Backplane Links | Factory Automation Serial Bus Nodes |
|---|---|
Use Scenario: Point-to-point differential signaling between PLC CPU and I/O modules over 1–10 m ribbon cables in electrically noisy plant-floor environments. IC Role / Device Role / Timing Role: DS89C21TMX/NOPB serves as the physical layer transceiver, converting TTL-level controller signals to robust RS-422 differential pairs and recovering data at the remote node. Use Value: 20 Mbps capability and ±14 V common-mode rejection ensure error-free communication despite EMI from VFDs and welding equipment. | Use Scenario: Multi-drop RS-422 network connecting programmable logic controllers, HMIs, and motion controllers in synchronized machine control systems. IC Role / Device Role / Timing Role: DS89C21TMX/NOPB acts as a half-duplex line driver/receiver at each node, enabling bidirectional data exchange using shared differential pair wiring. Use Value: Failsafe open-input behavior prevents spurious logic states during cable disconnection or node removal, maintaining system stability during maintenance. |
| Test Equipment Digital I/O Interfaces | Medical Diagnostic Instrumentation Links |
Use Scenario: High-speed digital stimulus/response interface between automated test equipment and DUTs requiring precise timing and noise immunity. IC Role / Device Role / Timing Role: DS89C21TMX/NOPB provides sub-10 ns propagation delay and ≤2 ns driver skew to preserve signal integrity for timing-critical pattern generation and capture. Use Value: 2.2 ns driver transition time and guaranteed AC parameters enable reliable 20 Mbps operation without added termination or equalization circuitry. | Use Scenario: Isolated serial communication between patient-monitoring front-end sensors and central processing unit in Class II medical devices. IC Role / Device Role / Timing Role: DS89C21TMX/NOPB functions as the isolated side's RS-422 line interface, interfacing with optocoupler-isolated UART signals. Use Value: Low 15 mW typical power dissipation and extended −40°C to +85°C operation support compact, fanless enclosures meeting IEC 60601-1 thermal safety limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential line driver/receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LBC179DR | Lower 3.3 V supply operation; higher 12 mA ICC; 10 Mbps max data rate; no failsafe open-input feature | Suitable for 3.3 V systems where lower speed suffices and external biasing can be implemented | Select SN65LBC179DR only if 3.3 V supply and <10 Mbps are acceptable; DS89C21TMX/NOPB required for 5 V, 20 Mbps, or failsafe operation |
| MAX3080CSA+ | 5 V supply; 16 Mbps max; includes slew-rate limiting; no guaranteed skew specs; higher 15 mA ICC | Better ESD protection (±15 kV HBM); intended for longer cable runs with reduced EMI emission | Choose MAX3080CSA+ when ESD robustness and controlled edge rates are prioritized over timing precision and power efficiency |
Compared with SN65LBC179DR and MAX3080CSA+, DS89C21TMX/NOPB uniquely delivers 20 Mbps performance with ≤2 ns driver skew, failsafe open-input behavior, and 6 mA supply current - making it optimal for timing-critical, power-sensitive, and maintenance-resilient industrial serial designs.
Availability
DS89C21TMX/NOPB is available at Aetrix Electronics and suitable for industrial PLC backplanes, factory automation serial nodes, and test equipment digital I/O interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS89C21TMX/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with decades of leadership in interface ICs and industrial-grade signal conditioning solutions.
The DS89C21TMX/NOPB belongs to TI's legacy RS-422/RS-485 line driver and receiver portfolio, designed specifically for high-reliability, noise-immune serial communication in industrial control, instrumentation, and automation systems.
FAQ
What is the maximum data rate supported by the DS89C21TMX/NOPB?
The DS89C21TMX/NOPB supports a maximum data rate of 20 Mbps under recommended operating conditions (VCC = 4.5–5.5 V, TA = −40°C to +85°C). This rating is validated by guaranteed AC timing parameters including tPLHD/tPHLD ≤10 ns and tTLH/tTHL ≤9 ns, ensuring reliable high-speed differential signaling without intersymbol interference.
Does the DS89C21TMX/NOPB require external biasing resistors on the receiver inputs?
No, the DS89C21TMX/NOPB does not require external biasing resistors due to its built-in failsafe feature: when the RI–RI* differential input is open (unterminated), the receiver output RO defaults to HIGH. This eliminates floating states and simplifies board design in multi-drop or hot-swap-capable RS-422 networks.
What is the supply current consumption of the DS89C21TMX/NOPB under typical operating conditions?
The DS89C21TMX/NOPB draws 3.0–6 mA typical supply current (ICC) with no load and DI held at VCC or GND, rising to 3.8–12 mA when DI is at intermediate logic levels (e.g., 2.4 V or 0.5 V). This low-power CMOS design enables use in battery-powered or thermally constrained applications while maintaining full RS-422 performance.
Can the DS89C21TMX/NOPB interface directly with TTL and CMOS logic families?
Yes, the DS89C21TMX/NOPB features TTL/CMOS-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive capability (VOH ≥ 3.8 V at −6 mA, VOL ≤ 0.3 V at +6 mA), allowing direct connection to standard 5 V TTL and CMOS devices without level-shifting circuitry.
What package type and lead finish does the DS89C21TMX/NOPB use?
The DS89C21TMX/NOPB uses an 8-pin SOIC package (JEDEC MS-012 AA, TI package code D) with Sn (matte tin) lead finish, RoHS-compliant, and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). It ships in large tape-and-reel format (2500 units per reel) with pin 1 in quadrant Q1.
DS89C21TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Transceiver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 1/1
- Duplex:
- Full
- Receiver Hysteresis:
- 50 mV
- Data Rate:
- 20Mbps
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
DS89C21TMX/NOPB FAQ
1.How can I place an order for DS89C21TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS89C21TMX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for DS89C21TMX/NOPB reliable?
The price and inventory of DS89C21TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS89C21TMX/NOPB is usually 5 days.
3.What payment methods are accepted for DS89C21TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS89C21TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS89C21TMX/NOPB?
DS89C21TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS89C21TMX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for DS89C21TMX/NOPB?
For technical support, including DS89C21TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS89C21TMX/NOPB requirements.
6.How does Aetrix verify that DS89C21TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All DS89C21TMX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DS89C21TMX/NOPB meets industry standards.
7.What is the process for return or replacement of DS89C21TMX/NOPB?
All DS89C21TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with DS89C21TMX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The DS89C21TMX/NOPB part is unused and in its original packaging.
Return procedure for DS89C21TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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