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Texas Instruments DS26LS32CM
- Part No.:
- DS26LS32CM
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS26LS32CM.pdf
- Description:
- IC TRANSCEIVER 0/4 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,117
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Product details
Overview
DS26LS32CM from Texas Instruments is a quad differential line receiver IC designed for RS-422 and RS-423 balanced/unbalanced digital data transmission systems. It operates from a single 5V supply, delivers ±0.2V input sensitivity over ±7V common-mode range, features 100 mV input hysteresis, 6 kΩ minimum input impedance, and TRI-STATE outputs with complementary enable logic-used in industrial serial communication backplanes.
For engineers reviewing the DS26LS32CM datasheet, DS26LS32CM pinout, DS26LS32CM application, or DS26LS32CM equivalent, this device supports robust noise-immune reception in multi-drop bus architectures, requires no external biasing due to internal pull-up/pull-down resistors (DS26LS32A variant), and enables direct connection to shared data buses via controlled output disable timing.
Technical Context
The DS26LS32CM implements four independent differential receivers with TTL-compatible outputs, each featuring dual enable inputs (ENABLE and ENABLE) that control TRI-STATE output behavior. Its input stage accepts differential voltages ≥200 mV while rejecting common-mode noise up to ±7V, meeting full RS-422/RS-423 electrical compliance.
Constructed using low-power Schottky bipolar technology, it achieves propagation delays of 17–25 ns (tPLH/tPHL) and enable/disable times as fast as 14–30 ns (tZL/tHZ), supporting data rates up to ~20 Mbps in point-to-point or multi-drop configurations with controlled bus loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75 V to 5.25 V - ensures stable operation across commercial temperature range without regulation overhead |
| Differential Input Sensitivity | ±0.2 V - guarantees reliable detection of small signal swings under noisy industrial EMI conditions |
| Common-Mode Input Range | ±7 V - allows interfacing with long cable runs and ground-potential differences in factory automation |
| Input Hysteresis | 100 mV - prevents output chatter during slow-rising/falling edge transitions on unterminated lines |
| Output Sink Current | 8 mA - drives standard TTL loads directly without external buffers in bus-tied configurations |
| Propagation Delay | 17–25 ns - supports >20 Mbps serial data rates in high-speed instrumentation links |
| TRI-STATE Enable Time | 14–22 ns (tZL/tZH) - enables rapid bus arbitration and dynamic channel sharing in multi-receiver systems |
Pinout & Package
DS26LS32CM is housed in a 16-pin SOIC (D package), RoHS-compliant, with 1.27 mm pitch and surface-mount footprint compatible with automated assembly. Pin functions are validated per TI SNLS352C datasheet Figure 1 and Package Drawing D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7, 10 | Inverting Input (A−, B−, C−, D−) | Differential negative inputs for each of four receiver channels |
| 2, 5, 8, 11 | Non-Inverting Input (A+, B+, C+, D+) | Differential positive inputs; paired with corresponding A−–D− for noise rejection |
| 3, 6, 9, 12 | Output (YA, YB, YC, YD) | TTL-compatible active-high outputs; go Hi-Z when disabled |
| 13, 14 | ENABLE / ENABLE | Complementary active-low enable pair controlling all four outputs simultaneously |
| 16 | VCC | Single +5 V power supply connection; decoupling required near pin |
| 8 | GND | Ground reference for all inputs, outputs, and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Integrated input pull-up/pull-down resistors | Prevents floating-input oscillation on unused channels without external components |
| TRI-STATE output with complementary enables | Allows seamless integration into shared data buses without contention or bus turnaround delay |
| ±7 V common-mode input range | Supports reliable operation across large ground potential differences in distributed control systems |
| 100 mV input hysteresis | Eliminates metastability and false triggering on slow or distorted differential waveforms |
| 6 kΩ minimum input impedance | Minimizes loading on upstream drivers and preserves signal integrity on long traces or cables |
Applications
| Industrial PLC Backplane | Point-of-Sale Terminal Interface |
|---|---|
|
Use Scenario: Receiving differential command signals from multiple I/O modules across a 1-meter backplane with mixed ground references. IC Role / Device Role / Timing Role: Quad receiver conditioning RS-422 signals into clean TTL logic for microcontroller input capture. Use Value: ±7 V common-mode tolerance eliminates need for isolated level shifters; 100 mV hysteresis suppresses switching noise induced by relay coil switching nearby. |
Use Scenario: Interfacing barcode scanner and receipt printer over separate RS-423 links to a central controller in retail kiosk. IC Role / Device Role / Timing Role: Single-chip solution for two independent unbalanced receiver channels with shared enable control. Use Value: Complementary ENABLE/ENABLE pins allow synchronized bus release; 8 mA sink current drives LED status indicators directly. |
| Test Equipment Data Acquisition | Building Automation Network Node |
|
Use Scenario: Capturing synchronized sensor data streams from four isolated analog front-ends using differential signaling over twisted-pair cabling. IC Role / Device Role / Timing Role: High-speed, low-jitter receiver front-end feeding FPGA-based timestamping logic. Use Value: 17 ns propagation delay ensures sub-50 ns timing alignment across channels; 25 ns max skew enables deterministic sampling windows. |
Use Scenario: Connecting HVAC controllers and lighting panels via RS-422 daisy-chain in commercial building infrastructure. IC Role / Device Role / Timing Role: Robust physical layer receiver tolerant of cable lengths up to 1200 m at 100 kbps. Use Value: 6 kΩ input impedance reduces termination complexity; ±0.2 V sensitivity maintains margin even with 20% signal attenuation over 1 km. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN65LBC174N | Higher ±15 V common-mode range; 300 mV sensitivity; no internal pull-ups | Better suited for longer cable runs (>1.2 km) but requires external biasing network | Select when extended common-mode immunity is critical and board space allows discrete bias resistors |
| MAX3044CSA+ | Low-power CMOS design; 3.3 V operation only; ±12 V common-mode; 200 mV sensitivity | Designed for mixed-voltage systems with 3.3 V microcontrollers; not 5 V tolerant | Choose for battery-powered or energy-constrained nodes where 5 V supply is unavailable |
Compared with SN65LBC174N and MAX3044CSA+, the DS26LS32CM provides optimal balance of 5 V compatibility, built-in biasing, and RS-422/RS-423 compliance-making it ideal for cost-sensitive, drop-in replacements in legacy industrial designs without layout revision.
Availability
DS26LS32CM is available at Aetrix Electronics and suitable for industrial PLC backplanes, point-of-sale terminal interfaces, and test equipment data acquisition requiring stable component supply across extended product lifecycles.
Supply support for DS26LS32CM 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, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The DS26LS32CM belongs to TI's legacy interface portfolio targeting robust, pin-compatible replacements for RS-422/RS-423 line receivers in industrial control and instrumentation systems where reliability and long-term availability are essential.
FAQ
What is the operating temperature range for DS26LS32CM?
The DS26LS32CM is rated for commercial temperature operation from 0°C to +70°C, as confirmed in TI's SNLS352C datasheet under Operating Conditions. This range aligns with standard industrial ambient environments and avoids military-grade thermal derating requirements. The DS26LS32CM does not support extended or automotive temperature grades-those are covered by DS26LS32M (−55°C to +125°C) variants. Always verify ambient PCB temperature during thermal design.
Does DS26LS32CM include internal pull-up/pull-down resistors?
No-only the DS26LS32AC and DS26LS32A variants include internal input pull-up and pull-down resistors. The DS26LS32CM is functionally identical to the base DS26LS32C, meaning it lacks those resistors and requires external biasing on unused inputs to prevent oscillation. This distinction is explicitly stated in the Features section of the SNLS352C datasheet and verified in the ordering table where DS26LS32CM maps to "C" (commercial, no pull-ups) rather than "AC" or "A".
What package type and lead finish does DS26LS32CM use?
The DS26LS32CM uses a 16-pin SOIC (Package Drawing D), with green RoHS-compliant finish (CU SN), moisture sensitivity level (MSL) Level-1, and peak reflow temperature of 260°C. This information is confirmed in TI's Package Option Addendum dated 23-Aug-2017, where DS26LS32CMX/NOPB lists "SOIC | D | 16" and "Green (RoHS & no Sb/Br) | CU SN". No alternate packages (e.g., ceramic LCC or DIP) are assigned to the DS26LS32CM orderable part number.
Can DS26LS32CM be used in RS-485 systems?
The DS26LS32CM is not an RS-485 transceiver and lacks driver functionality or fail-safe biasing required for true RS-485 half-duplex networks. However, it can serve as the receiver portion of an RS-485 system when paired with a separate RS-485 driver (e.g., DS26LS31), since RS-485 electrical specifications are a superset of RS-422. Its ±7 V common-mode range and 200 mV sensitivity meet RS-485 receiver thresholds, but system-level compliance depends on full transceiver implementation.
What is the maximum data rate supported by DS26LS32CM?
Based on its 17–25 ns propagation delay (tPLH/tPHL) and 14–22 ns enable/disable timing (tZL/tZH), the DS26LS32CM supports reliable operation up to approximately 20 Mbps in point-to-point configurations with proper termination and low-capacitance routing. This estimate follows the industry rule-of-thumb that maximum bit rate ≈ 0.35 / tPD, yielding ~14–20 Mbps. Actual achievable rate depends on cable length, stubs, and noise-TI's typical applications show use at ≤10 Mbps for 1200 m RS-422 links.
DS26LS32CM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Receiver
- Protocol:
- RS422, RS423
- Number of Drivers/Receivers:
- 0/4
- Duplex:
- -
- Receiver Hysteresis:
- 100 mV
- 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
DS26LS32CM FAQ
1.How can I place an order for DS26LS32CM through Aetrix?
Please submit a Request for Quotation (RFQ) for DS26LS32CM 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 DS26LS32CM reliable?
The price and inventory of DS26LS32CM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS26LS32CM is usually 5 days.
3.What payment methods are accepted for DS26LS32CM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS26LS32CM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS26LS32CM?
DS26LS32CM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS26LS32CM 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 DS26LS32CM?
For technical support, including DS26LS32CM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS26LS32CM requirements.
6.How does Aetrix verify that DS26LS32CM is sourced from the original manufacturer or authorized distributors?
All DS26LS32CM 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 DS26LS32CM meets industry standards.
7.What is the process for return or replacement of DS26LS32CM?
All DS26LS32CM units undergo pre-shipment inspection (PSI). If there is an issue with DS26LS32CM, 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 DS26LS32CM part is unused and in its original packaging.
Return procedure for DS26LS32CM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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