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Texas Instruments DS26C31TMX/NOPB
- Part No.:
- DS26C31TMX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS26C31TMX/NOPB.pdf
- Description:
- IC TRANSCEIVER 4/0 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,869
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Product details
Overview
DS26C31TMX/NOPB from Texas Instruments (formerly National Semiconductor) is a CMOS quad differential line driver for RS-422 digital data transmission over balanced lines. It accepts TTL/CMOS inputs, delivers ±2.5 V min differential output voltage into 100 Ω, features 6 ns typical propagation delay and 0.5 ns typical output skew, and operates from a single 5 V supply in industrial temperature range (−40°C to +85°C).
For engineers reviewing the DS26C31TMX/NOPB datasheet, DS26C31TMX/NOPB pinout, DS26C31TMX/NOPB application, or DS26C31TMX/NOPB equivalent, key selection criteria include RS-422 compliance, TRI-STATE® bus interface capability, low quiescent current (≤500 µA), power-down behavior with VCC = 0 V, and compatibility with legacy AM26LS31/DS26LS31 layouts.
Technical Context
The DS26C31TMX/NOPB implements four independent differential drivers with common enable/disable control, each translating single-ended TTL/CMOS logic into EIA RS-422-compliant differential outputs. Its output stage uses CMOS circuitry with built-in bus-isolation during power-down, preventing bus loading when VCC = 0 V.
It meets full RS-422 electrical requirements per EIA-422-B, including minimum 2.0 V differential output voltage (VT) and ≤0.4 V differential mismatch, while maintaining low ICC (≤2.0 mA active, ≤500 µA quiescent) and fast switching (tPLH/tPHL ≤14 ns max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances without external regulation. |
| Differential Output Voltage (VT) | 2.5 V (typ), ≥2.0 V (min) at IOUT = ±20 mA into 100 Ω - Meets RS-422 noise margin and cable drive requirements. |
| Propagation Delay | 6 ns (typ), ≤14 ns (max) - Enables reliable high-speed serial communication up to ~35 Mbps (based on tPLH + tPHL budget). |
| Output Skew | 0.5 ns (typ), ≤3.0 ns (max) - Guarantees tight timing alignment across all four driver pairs for synchronous multi-channel systems. |
| Quiescent Supply Current | ≤500 µA at VCC = 5 V, TA = 25°C - Supports low-power standby modes without compromising bus integrity. |
| TRI-STATE Leakage | ±5.0 µA max at VOUT = VCC/GND - Minimizes bus contention and signal corruption during disable state. |
| Operating Temperature | −40°C to +85°C - Qualified for industrial-grade embedded and communications equipment deployment. |
Pinout & Package
DS26C31TMX/NOPB is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package, designated NS Package Number M16A, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10 | Inverting Input (A̅, B̅, C̅, D̅) | Accepts TTL/CMOS logic low/high; paired with non-inverting input to generate complementary RS-422 output. |
| 2, 5, 8, 11 | Non-Inverting Input (A, B, C, D) | Accepts TTL/CMOS logic; defines polarity of corresponding differential output pair. |
| 3, 6, 9, 12 | Inverting Output (Y̅, Z̅, etc.) | RS-422 differential output terminal; swings negative relative to non-inverting output under load. |
| 13, 14, 15, 16 | Non-Inverting Output (Y, Z, etc.) | RS-422 differential output terminal; swings positive relative to inverting output under load. |
| 17 | VCC | Positive supply pin - powers all four drivers and internal logic; must be decoupled locally. |
| 18 | GND | Ground reference for all inputs, outputs, and internal circuitry - requires low-impedance connection. |
Key Features
| Feature | Design Value |
|---|---|
| RS-422 Compliance | Fully meets EIA-422-B electrical specifications including VT, VOS, and skew limits - ensures interoperability with standard RS-422 receivers. |
| TRI-STATE® Bus Interface | Common enable/disable control for all four drivers enables clean multiplexing onto shared differential buses without signal contention. |
| Zero-Voltage Bus Isolation | Outputs remain high-impedance and non-loading even when VCC = 0 V - supports hot-swap and power-gating architectures. |
| TTL/CMOS Input Compatibility | VIH = 2.0 V min, VIL = 0.8 V max - interfaces directly with 5 V microcontrollers, FPGAs, and logic families without level-shifting. |
| Low-Power CMOS Architecture | ICC ≤ 2.0 mA active, ≤500 µA quiescent - reduces thermal load and extends battery life in portable or dense PCB designs. |
Applications
| Industrial Serial Communication | Point-of-Sale Terminal Interfaces |
|---|---|
|
Use Scenario: Long-distance serial links between PLCs and HMIs in factory automation cabinets. IC Role / Device Role / Timing Role: Differential line driver converting controller UART signals to robust RS-422 for noise-immune transmission up to 4000 ft. Use Value: 2.5 V differential swing and 0.5 ns skew ensure reliable bit error rates <10−12 in electrically noisy plant environments. |
Use Scenario: Interconnecting receipt printers, barcode scanners, and cash drawers in retail POS systems. IC Role / Device Role / Timing Role: Quad driver enabling simultaneous RS-422 control of multiple peripherals from a single host controller. Use Value: Common enable logic allows coordinated peripheral power-up/down sequences without bus conflicts or glitches. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
|
Use Scenario: Data acquisition modules transmitting sensor readings from isolated patient-side units to central processing units. IC Role / Device Role / Timing Role: Isolated differential transmitter providing galvanic separation and ESD-hardened signal integrity. Use Value: Input ESD protection (≥1500 V HBM) and zero-VCC bus isolation meet IEC 60601-1 safety requirements for medical interconnects. |
Use Scenario: High-precision oscilloscopes and logic analyzers requiring synchronized multi-channel stimulus generation. IC Role / Device Role / Timing Role: Quad driver delivering time-aligned differential clocks and trigger signals to DUTs. Use Value: 0.5 ns typical skew and 6 ns propagation delay enable sub-nanosecond channel-to-channel timing correlation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LVDS31DR | LVDS output standard (350 mV swing), 3.3 V supply only, no TTL input compatibility. | Designed for high-speed point-to-point links (e.g., FPGA-to-FPGA), not multi-drop RS-422 buses. | Choose SN65LVDS31DR only if system uses LVDS signaling and 3.3 V rails; not drop-in for RS-422 infrastructure. |
| AM26LS31CDR | Bipolar technology, higher ICC (15–25 mA), 15 ns max propagation delay, same pinout and RS-422 compliance. | Legacy replacement where board layout reuse is mandatory and power budget allows higher dissipation. | AM26LS31CDR offers identical pinout and function but consumes ~30× more quiescent power than DS26C31TMX/NOPB. |
Compared with SN65LVDS31DR and AM26LS31CDR, DS26C31TMX/NOPB uniquely balances RS-422 compliance, 5 V TTL compatibility, ultra-low ICC, and proven industrial temperature reliability - making it optimal for cost-sensitive, power-constrained, and legacy-compatible serial interface designs.
Availability
DS26C31TMX/NOPB is available at Aetrix Electronics and suitable for industrial serial communication, point-of-sale terminal interfaces, and test & measurement instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for DS26C31TMX/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 acquired National Semiconductor in 2011 and maintains its precision analog and interface product portfolio. TI is a global semiconductor leader focused on analog, embedded processing, and connectivity solutions.
The DS26C31TMX/NOPB belongs to National's legacy RS-422 interface line, engineered specifically for robust, low-power, multi-drop digital communication in industrial and commercial systems operating from 5 V supplies.
FAQ
What is the RS-422 compliance status of DS26C31TMX/NOPB?
The DS26C31TMX/NOPB fully meets all electrical requirements of EIA-422-B, including minimum 2.0 V differential output voltage (VT), ≤0.4 V differential mismatch, and common-mode output voltage range of 1.8–3.0 V. It is explicitly certified as compliant in the original National Semiconductor datasheet DS008574, with test conditions aligned to RS-422A.
Does DS26C31TMX/NOPB support true power-down bus isolation?
Yes. DS26C31TMX/NOPB guarantees that outputs remain high-impedance and do not load the bus even when VCC = 0 V, as confirmed by IOFF specification (±100 µA max leakage at VOUT = −0.25 V or 0 V). This enables safe hot-swap and partial-system power gating without disrupting other nodes on the RS-422 bus.
What is the maximum data rate supported by DS26C31TMX/NOPB?
While not explicitly rated for a fixed Mbps value, DS26C31TMX/NOPB's 6 ns typical propagation delay and 0.5 ns skew support reliable operation at data rates up to approximately 35 Mbps in point-to-point configurations. Real-world multi-drop RS-422 deployments typically use it at ≤10 Mbps to maintain timing margins over longer cables.
Is DS26C31TMX/NOPB pin-compatible with older bipolar line drivers?
Yes. DS26C31TMX/NOPB is explicitly documented as pin-compatible with AM26LS31 and DS26LS31, sharing identical 16-pin SOIC (M16A) pinout, terminal assignments, and functional logic. This allows direct replacement in existing designs to reduce power consumption without PCB revision.
What are the thermal limitations of DS26C31TMX/NOPB in SOIC package?
In its SOIC-16 (M16A) package, DS26C31TMX/NOPB has a maximum power dissipation of 1226 mW at 25°C ambient, derating at 9.80 mW/°C above that temperature. At full 2.0 mA active current and 5 V supply, typical power dissipation remains well below this limit, enabling operation up to +85°C without heatsinking.
DS26C31TMX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Driver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 4/0
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS26C31TMX/NOPB FAQ
1.How can I place an order for DS26C31TMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26C31TMX/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 DS26C31TMX/NOPB reliable?
The price and inventory of DS26C31TMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26C31TMX/NOPB is usually 5 days.
3.What payment methods are accepted for DS26C31TMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26C31TMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26C31TMX/NOPB?
DS26C31TMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26C31TMX/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 DS26C31TMX/NOPB?
For technical support, including DS26C31TMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26C31TMX/NOPB requirements.
6.How does Aetrix verify that DS26C31TMX/NOPB is sourced from the original manufacturer or authorized distributors?
All DS26C31TMX/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 DS26C31TMX/NOPB meets industry standards.
7.What is the process for return or replacement of DS26C31TMX/NOPB?
All DS26C31TMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with DS26C31TMX/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 DS26C31TMX/NOPB part is unused and in its original packaging.
Return procedure for DS26C31TMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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