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Texas Instruments DS26LS31CM
- Part No.:
- DS26LS31CM
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS26LS31CM.pdf
- Description:
- IC TRANSCEIVER 4/0 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,133
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Product details
Overview
DS26LS31CM from Texas Instruments is a quad high-speed differential line driver IC designed for RS-422 digital data transmission over balanced twisted-pair lines. It delivers 10 ns typical input-to-output delay, 2.0 ns typical output skew, and operates from a single 5V supply while providing TRI-STATE outputs and complementary differential drive capability in industrial communications systems.
For engineers reviewing the DS26LS31CM datasheet, DS26LS31CM pinout, DS26LS31CM application, or DS26LS31CM equivalent, key selection considerations include its RS-422 compliance, 0°C to +70°C commercial temperature range, SOIC-16 package, and enable-controlled quad-driver architecture with short-circuit protection and zero-load behavior during VCC = 0V.
Technical Context
The DS26LS31CM implements four independent LS-compatible differential drivers with logically ANDed enable control, supporting unipolar differential signaling into 100Ω balanced loads. Its output stage provides complementary signals (A/B per channel) with VOH ≥2.5V at −20mA and VOL ≤0.5V at 20mA under 5V operation.
Switching performance is characterized at CL = 30 pF: tPLH/tPHL ≤15 ns, skew ≤6.0 ns, and enable/disable times (tLZ/tHZ/tZL/tZH) ranging from 15–35 ns. The device remains electrically inactive with no line loading when VCC = 0V, enabling hot-swap compatibility in backplane and modular systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75V to 5.25V - ensures stable RS-422 output swing across commercial temperature range |
| Input Compatibility | LS-TTL - interfaces directly with standard logic families without level-shifting |
| Output Skew | 2.0 ns typical - maintains timing alignment across all four differential pairs for synchronous multi-channel transmission |
| Propagation Delay | 10 ns typical - supports >50 Mbps data rates in point-to-point or multidrop RS-422 links |
| TRI-STATE Enable | Common active-low enable - allows bus sharing and dynamic channel isolation in multipoint networks |
| Short-Circuit Protection | −30 mA to −150 mA - limits fault current during line shorts without latch-up or permanent damage |
| Power Supply Current | 35–60 mA - enables thermal design for SOIC-16 package at full channel activity |
Pinout & Package
DS26LS31CM is housed in a 16-pin SOIC (Package Drawing D) with 1.27 mm pitch, JEDEC-standard footprint, and RoHS-compliant CU SN finish. Moisture Sensitivity Level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10 | Channel Input A | Non-inverting LS-TTL input per driver channel (CH1–CH4) |
| 2, 5, 8, 11 | Channel Input B | Inverting LS-TTL input per driver channel (CH1–CH4) |
| 3, 6, 9, 12 | Output A | Non-inverting differential output (RS-422 A-side) |
| 13, 14, 15, 16 | Output B | Inverting differential output (RS-422 B-side) |
| 17 (N/C) | No Connect | Not bonded - unused pin in SOIC-16 layout |
| 18 (N/C) | No Connect | Not bonded - unused pin in SOIC-16 layout |
Key Features
| Feature | Design Value |
|---|---|
| RS-422 Compliance | Fully meets EIA-422 electrical requirements including differential output voltage, common-mode range, and receiver input impedance compatibility |
| Zero-Voltage Line Isolation | Outputs present high-impedance state with no leakage or loading when VCC = 0V - critical for hot-swap and power sequencing |
| Quad-Driver Density | Four fully independent RS-422 drivers in one SOIC-16 package - reduces PCB area and interconnect complexity vs discrete solutions |
| Output Short-Circuit Tolerance | Sustains continuous short-circuit conditions without degradation - eliminates need for external current-limiting resistors |
| Complementary Differential Outputs | Each channel provides true A/B differential pair - enables noise-immune transmission over long cables in noisy industrial environments |
Applications
| Industrial PLC Backplane | Point-to-Point Serial Link |
|---|---|
Use Scenario: High-reliability data exchange between CPU and I/O modules in programmable logic controllers using daisy-chained RS-422 buses. IC Role / Device Role / Timing Role: Quad differential line driver providing synchronized, low-skew signal transmission across multiple isolated backplane segments. Use Value: 2.0 ns typical output skew ensures deterministic timing across all four channels, preventing inter-channel jitter accumulation in time-critical motion control loops. | Use Scenario: Bidirectional serial communication between CNC controller and servo drive over 15 m twisted-pair cable in factory automation. IC Role / Device Role / Timing Role: RS-422 line driver delivering robust differential signaling with 10 ns propagation delay for real-time command updates. Use Value: Single 5V supply operation and TRI-STATE enable allow seamless integration with existing 5V logic infrastructure without auxiliary rails or level shifters. |
| Multidrop Sensor Network | Legacy Equipment Interface |
Use Scenario: Connecting up to 10 temperature/pressure sensors to a central DAQ system via shared RS-422 bus with termination resistors. IC Role / Device Role / Timing Role: Channel-isolated driver enabling selective activation of sensor transmitters while maintaining bus integrity. Use Value: Common enable control allows software-directed channel muting - reducing crosstalk and ground loop interference in mixed-signal measurement systems. | Use Scenario: Interfacing modern microcontroller-based HMI panels to legacy RS-422 instrumentation (e.g., oscilloscopes, spectrum analyzers). IC Role / Device Role / Timing Role: Signal translator converting TTL-level UART output to RS-422 differential format compatible with legacy equipment inputs. Use Value: LS-TTL input compatibility eliminates need for external logic buffers, simplifying retrofit designs while preserving timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad RS-422 line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM26LS31CDR | Pin-compatible but rated for −40°C to +85°C; slightly higher ICC (max 75 mA); identical switching specs | Preferred for extended-temperature industrial deployments where ambient exceeds +70°C | Select AM26LS31CDR when operating outside 0°C–70°C range or requiring TI's newer manufacturing process traceability |
| SN65LVDS31DR | LVDS output standard (not RS-422); 3.3V supply only; lower skew (0.3 ns); no TRI-STATE enable | Used in high-speed, low-power, short-reach links (≤1 m) where LVDS compatibility is required | Choose SN65LVDS31DR only if system uses LVDS receivers and operates at 3.3V - not a drop-in replacement for RS-422 infrastructure |
Compared with AM26LS31CDR and SN65LVDS31DR, the DS26LS31CM offers guaranteed RS-422 compliance, commercial-temperature optimized power efficiency, and integrated enable control - making it the optimal choice for cost-sensitive, medium-distance (≤1200 m), 5V-based industrial serial interfaces.
Availability
DS26LS31CM is available at Aetrix Electronics and suitable for industrial PLC backplanes, point-to-point serial links, and multidrop sensor networks requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for DS26LS31CM 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The DS26LS31CM belongs to TI's legacy RS-422 interface product line, engineered specifically for robust, noise-immune digital data transmission in electrically harsh industrial environments using standardized differential signaling.
FAQ
What is the operating temperature range for DS26LS31CM?
The DS26LS31CM is specified for commercial operation from 0°C to +70°C. This range is validated per the Electrical Characteristics table in the official TI datasheet SNOSBK1C, and applies to all parametric performance including VOH/VOL, propagation delay, and skew. The DS26LS31CMX/NOPB ordering variant confirms this temperature grade in TI's Package Option Addendum. DS26LS31CM does not support extended or military temperature ranges.
Does DS26LS31CM support hot-swap functionality?
Yes, DS26LS31CM supports hot-swap operation due to its "outputs won't load line when VCC = 0V" feature. When supply voltage drops to zero, all outputs enter a high-impedance state with negligible leakage current (<20 μA), preventing signal corruption or bus contention on live RS-422 lines. This behavior is explicitly documented in the Features section of the DS26LS31CM datasheet and verified across the full commercial temperature range.
Is DS26LS31CM pin-compatible with AM26LS31?
Yes, DS26LS31CM is pin-compatible with AM26LS31 per TI's datasheet claim: "Pin Compatible with AM26LS31". Both devices use identical SOIC-16 (D) and PDIP-16 (NFG) packages with matching pin functions and assignments. However, DS26LS31CM is rated for 0°C to +70°C, while AM26LS31 variants may offer extended temperature grades - verify specific AM26LS31 part number temperature specifications before substitution.
What load capacitance is used to characterize DS26LS31CM switching performance?
DS26LS31CM switching characteristics-including tPLH, tPHL, skew, and enable timing-are characterized at CL = 30 pF for propagation parameters and CL = 10 pF for enable/disable transitions. These test conditions are defined in the Switching Characteristics table of the SNOSBK1C datasheet and reflect standard RS-422 bus loading with typical cable and receiver input capacitance. Performance degrades predictably beyond these values, as shown in TI's Typical Performance Characteristics curves.
Does DS26LS31CM require external termination resistors?
No, DS26LS31CM does not integrate termination resistors; external 100Ω differential termination is required at the receiver end of the RS-422 line per EIA-422 standard. The DS26LS31CM datasheet's Figure 5 ("Two-Wire Balanced System") explicitly shows optional RT (termination resistor) at the far end. Omitting termination causes signal reflections and timing violations-especially beyond 10 m cable length-so proper 100Ω matching is mandatory for reliable DS26LS31CM operation.
DS26LS31CM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Driver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 4/0
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS26LS31CM FAQ
1.How can I place an order for DS26LS31CM through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26LS31CM 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 DS26LS31CM reliable?
The price and inventory of DS26LS31CM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26LS31CM is usually 5 days.
3.What payment methods are accepted for DS26LS31CM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26LS31CM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26LS31CM?
DS26LS31CM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26LS31CM 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 DS26LS31CM?
For technical support, including DS26LS31CM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26LS31CM requirements.
6.How does Aetrix verify that DS26LS31CM is sourced from the original manufacturer or authorized distributors?
All DS26LS31CM 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 DS26LS31CM meets industry standards.
7.What is the process for return or replacement of DS26LS31CM?
All DS26LS31CM units undergo pre-shipment inspection (PSI). If there is an issue with DS26LS31CM, 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 DS26LS31CM part is unused and in its original packaging.
Return procedure for DS26LS31CM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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