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Texas Instruments DS9638CM
- Part No.:
- DS9638CM
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS9638CM.pdf
- Description:
- IC DRIVER 2/0 HS DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
DS9638CM from Texas Instruments is a dual RS-422 differential line driver in SOIC-8 package, featuring TTL/CMOS-compatible inputs, 50 mA output drive into 50Ω loads, <1.0 ns typical output skew, and propagation delay under 10 ns. It operates from a single 5V supply and delivers glitchless complementary outputs for high-speed industrial serial communication links.
For engineers reviewing the DS9638CM datasheet, DS9638CM pinout, DS9638CM application, or DS9638CM equivalent, key selection criteria include output short-circuit protection, input clamp diodes, stable delay across temperature (±2.0 ns typical), and EIA RS-422 compliance at up to 30 Mbps data rates.
Technical Context
The DS9638CM integrates two independent Schottky-based differential drivers with active pull-up/pull-down totem-pole outputs, enabling unipolar differential signaling over twisted-pair lines. Its architecture supports terminated transmission with balanced VT–VT ≤ 0.4 V and VOS–VOS ≤ 0.4 V.
It uses TTL-level logic thresholds (VIH = 2.0 V min, VIL = 0.8 V max at 0°C to +70°C) and maintains delay stability across VCC (4.75–5.25 V) and temperature (0°C to +70°C), with no external biasing required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - ensures compatibility with standard 5V logic rails and noise margin robustness |
| Output Drive | ±50 mA into 50Ω - enables direct driving of RS-422-compliant transmission lines without external buffers |
| Propagation Delay | <10 ns - supports data rates up to ~30 Mbps in point-to-point or multidrop configurations |
| Output Skew | <1.0 ns typical - preserves signal integrity in timing-critical differential pairs (A/A̅, B/B̅) |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade industrial control and instrumentation environments |
| Input Compatibility | TTL and CMOS - allows direct interfacing with microcontrollers, FPGAs, and legacy logic families |
| Short-Circuit Protection | Active on outputs - prevents latch-up or damage during bus contention or miswiring |
Pinout & Package
DS9638CM is housed in an 8-pin SOIC (Package Drawing D), with gull-wing leads, RoHS-compliant CuSn finish, and moisture sensitivity level (MSL) 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A IN) | Channel A non-inverting input | Accepts TTL/CMOS logic HIGH ≥2.0 V; drives complementary A and A̅ outputs |
| 2 (B IN) | Channel B non-inverting input | Accepts TTL/CMOS logic HIGH ≥2.0 V; drives complementary B and B̅ outputs |
| 3 (GND) | Power ground reference | Common return for all internal circuitry and output current paths |
| 4 (A) | Channel A true output | Differential output terminal referenced to A̅; delivers active HIGH/LOW with low impedance |
| 5 (A̅) | Channel A complement output | Complementary to Pin 4; forms differential pair with 0.4 V max balance error |
| 6 (B) | Channel B true output | Differential output terminal referenced to B̅; matched skew and timing to A/A̅ pair |
| 7 (B̅) | Channel B complement output | Complementary to Pin 6; enables full-duplex or dual independent RS-422 links |
| 8 (VCC) | Positive supply rail | Single 5V supply input; powers both drivers and input logic; decoupling recommended |
Key Features
| Feature | Design Value |
|---|---|
| RS-422 Compliance | Fully meets EIA RS-422 electrical specifications including differential voltage, skew, and drive strength |
| Glitchless Differential Output | Simultaneous switching of complementary outputs eliminates transient common-mode spikes |
| Input Clamp Diodes | Integrated VI/VCC clamps protect against overvoltage transients up to ±7 V input range |
| Delay Stability | Propagation delay variation <2.0 ns across full VCC and temperature range - critical for synchronous multi-channel systems |
| SOIC-8 Footprint | Standard 150-mil width package enables drop-in replacement in legacy RS-422 designs without layout change |
Applications
| Industrial PLC Serial Links | Factory Automation Bus Nodes |
|---|---|
Use Scenario: Bidirectional RS-422 communication between PLC CPU and remote I/O modules over 100+ meter twisted-pair runs. IC Role / Device Role / Timing Role: Dual-line driver providing robust differential signaling with <10 ns propagation delay and <1 ns skew to maintain timing margins. Use Value: Enables reliable 10–30 Mbps data transfer in electrically noisy factory environments while meeting EIA RS-422 common-mode rejection requirements. | Use Scenario: Multi-drop RS-422 network connecting CNC controllers, servo drives, and HMIs in coordinated motion systems. IC Role / Device Role / Timing Role: Channel-isolated driver delivering matched A/A̅ and B/B̅ outputs to preserve signal integrity across distributed nodes. Use Value: Maintains sub-nanosecond inter-channel skew and 0.4 V output balance to prevent bit errors in high-reliability motion control loops. |
| Test Equipment Data Interfaces | Medical Diagnostic Instrumentation |
Use Scenario: High-speed digital stimulus/response interface between automated test equipment and DUTs requiring precise timing alignment. IC Role / Device Role / Timing Role: Low-skew dual driver ensuring deterministic edge placement for synchronized sampling and pattern generation. Use Value: Delivers <1.0 ns typical output skew and stable delay (<2.0 ns variation) across temperature - essential for sub-ns timing correlation. | Use Scenario: Isolated serial communication link between imaging subsystems (e.g., ultrasound beamformer) and central control unit. IC Role / Device Role / Timing Role: RS-422 line driver supporting noise-immune data transport in safety-critical diagnostic platforms. Use Value: Provides short-circuit protected outputs and input clamp diodes to withstand ESD events per IEC 61000-4-2 in clinical settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-422 dual line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX3080CSA+ | Higher supply range (4.75–5.25 V same), but adds fail-safe biasing and thermal shutdown; 12 ns max propagation delay | Preferred where bus idle-state logic level must be guaranteed without external resistors | Select MAX3080CSA+ when fail-safe operation or thermal protection is required; DS9638CM offers lower skew and faster delay |
| SN65LVDS31DR | LVDS output standard (not RS-422); 3.3V supply only; 2.5 ns typical propagation delay; no short-circuit protection | Suitable only for point-to-point LVDS links with controlled impedance, not RS-422 multidrop or long-cable applications | Choose SN65LVDS31DR only for 3.3V LVDS systems; DS9638CM remains optimal for 5V RS-422 compliance and ruggedness |
Compared with MAX3080CSA+ and SN65LVDS31DR, DS9638CM uniquely combines EIA RS-422 compliance, <1 ns skew, 50 mA drive into 50Ω, and integrated short-circuit protection - making it the preferred choice for industrial 5V serial infrastructure where timing precision and fault resilience are co-required.
Availability
DS9638CM is available at Aetrix Electronics and suitable for industrial PLC serial links, factory automation bus nodes, and test equipment data interfaces requiring stable component supply and long-term design continuity.
Supply support for DS9638CM 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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in industrial interface solutions.
The DS9638CM belongs to TI's legacy RS-422/RS-485 line driver product line, engineered for high-speed, noise-immune serial communication in harsh industrial and instrumentation environments.
FAQ
What is the maximum data rate supported by the DS9638CM?
The DS9638CM supports data rates up to approximately 30 Mbps, derived from its <10 ns propagation delay and <1.0 ns output skew-key parameters enabling clean signal edges and minimal jitter in high-speed RS-422 links. This performance is validated under load conditions of 50Ω termination and CL = 15 pF, per the official TI SNLS389D datasheet.
Does the DS9638CM require external biasing resistors for RS-422 operation?
No, the DS9638CM does not require external biasing resistors. Its outputs are designed for direct connection to terminated 50Ω transmission lines, and its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) ensure reliable logic recognition without pull-ups or pull-downs. The DS9638CM datasheet confirms operation with standard RS-422 termination schemes.
What is the operating temperature range specified for the DS9638CM?
The DS9638CM is rated for operation from 0°C to +70°C, as confirmed in the Recommended Operating Conditions table of the TI SNLS389D datasheet. This commercial-grade temperature range aligns with its SOIC packaging and qualification for industrial control, test equipment, and instrumentation applications.
How does the DS9638CM handle output short circuits?
The DS9638CM features built-in output short-circuit protection, limiting sink/source current to −50 mA to −150 mA (typical) when VO = 0 V, per the Electrical Characteristics table. This protection prevents device damage during bus contention, miswiring, or transient faults-ensuring reliability in deployed industrial systems using DS9638CM.
Is the DS9638CM pin-compatible with other devices in the DS96xx family?
Yes-the DS9638CM shares identical pinout and function with DS9638M (−55°C to +125°C) and DS9638C (0°C to +70°C) variants, all using the same SOIC-8 (D) package and pin mapping. This uniformity allows direct substitution within the same temperature grade, as verified in TI's package drawings and connection diagrams for DS9638.
DS9638CM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Driver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 2/0
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- -
DS9638CM FAQ
1.How can I place an order for DS9638CM through Aetrix?
Please submit a Request for Quotation (RFQ) for DS9638CM 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 DS9638CM reliable?
The price and inventory of DS9638CM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS9638CM is usually 5 days.
3.What payment methods are accepted for DS9638CM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS9638CM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS9638CM?
DS9638CM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS9638CM 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 DS9638CM?
For technical support, including DS9638CM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS9638CM requirements.
6.How does Aetrix verify that DS9638CM is sourced from the original manufacturer or authorized distributors?
All DS9638CM 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 DS9638CM meets industry standards.
7.What is the process for return or replacement of DS9638CM?
All DS9638CM units undergo pre-shipment inspection (PSI). If there is an issue with DS9638CM, 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 DS9638CM part is unused and in its original packaging.
Return procedure for DS9638CM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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