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Texas Instruments DS3691M
- Part No.:
- DS3691M
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS3691M.pdf
- Description:
- IC TRANSCEIVER 2/0 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,858
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Product details
Overview
DS3691M from Texas Instruments is a dual RS-422 or quad RS-423 line driver with TRI-STATE outputs, designed for industrial serial communication interfaces. It delivers ±6.0V differential output voltage (RS-422), 100Ω transmission line drive capability, and supports 0°C to +70°C operating temperature. Used in point-to-point and fully loaded multi-drop RS-422/RS-423 systems requiring controlled rise time and short-circuit protection.
For engineers reviewing the DS3691M datasheet, DS3691M pinout, DS3691M application, or DS3691M equivalent, key selection considerations include mode-select configurable operation (differential vs. single-ended), ±10V common-mode range in TRI-STATE mode, 200ns typical rise/fall time (RS-422), 30mA max supply current, and SOIC-16 package compatibility with AM26LS30.
Technical Context
The DS3691M operates in two mutually exclusive modes: with MODE pin low, it functions as two differential RS-422 drivers with TRI-STATE control per channel; with MODE pin high, it operates as four single-ended RS-423 drivers. Each output features internal short-circuit protection and power-off non-clamping behavior.
Rise time is externally adjustable via capacitor on the SLEW pin-enabling near-end crosstalk suppression in RS-423 mode-but waveshaping is prohibited in multipoint RS-422 configurations. Input compatibility spans TTL, MOS, and CMOS logic families, with low-current PNP inputs drawing ≤40μA at VIH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | VCC = 4.75–5.25V, VEE = −4.75 to −5.25V - requires dual ±5V rail for full RS-422 compliance |
| Differential Output Voltage | ±3.6V min into 100Ω load - meets EIA RS-422 minimum drive strength for noise margin |
| Output Common-Mode Range | ±10V in TRI-STATE mode - prevents bus contention during disable in mixed-voltage systems |
| Rise/Fall Time (RS-422) | 120–200ns into 100Ω/500pF - ensures signal integrity on stub-limited twisted-pair runs |
| TRI-STATE Enable/Disable Delay | 180–350ns - enables clean bus arbitration in half-duplex multidrop RS-422 networks |
| Short-Circuit Current Limit | ±80 to ±150mA per output - protects against sustained faults without latch-up or thermal shutdown |
| Power Consumption | ICC = 30mA max (RS-422), IEE = −22mA max (RS-423) - suitable for low-power isolated interface designs |
Pinout & Package
DS3691M is housed in a 16-pin SOIC package (Package Drawing D, JEDEC MS-012, body width 3.9mm). Pin spacing is 1.27mm, footprint compatible with industry-standard SOIC-16 PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6, 8, 10, 11, 13 | Input (A/B/C/D, ENA/ENB, MODE, SLEW) | CMOS/TTL-compatible control inputs; MODE selects RS-422 (low) or RS-423 (high); SLEW adjusts rise time |
| 2, 5, 7, 9, 12, 14, 15, 16 | Output (A+/A−, B+/B−, C, D, GND, VCC, VEE) | Differential pairs A+/A− and B+/B− for RS-422; single-ended C/D for RS-423; dedicated VCC/VEE/GND pins |
Key Features
| Feature | Design Value |
|---|---|
| Mode-selectable topology | Single part supports both RS-422 (2-channel diff) and RS-423 (4-channel SE) - reduces BOM count and layout variants |
| TRI-STATE outputs with ±10V common-mode range | Enables hot-swappable node insertion and bus sharing without signal clamping when powered down |
| External rise-time control (SLEW pin) | Capacitor-based edge rate tuning suppresses near-end crosstalk in RS-423 point-to-multipoint wiring |
| 100Ω transmission line drive | Meets RS-422 impedance matching requirement for unterminated or minimally terminated 100Ω twisted-pair cables |
| Pin compatibility with AM26LS30 | Drop-in replacement for legacy AM26LS30 designs - no PCB redesign required for upgrade path |
Applications
| Industrial PLC Serial Interface | Point-to-Point RS-422 Data Link |
|---|---|
|
Use Scenario: Connecting programmable logic controller (PLC) CPU module to remote I/O chassis over 30m shielded twisted pair. IC Role / Device Role / Timing Role: RS-422 line driver providing differential signaling, noise immunity, and bus arbitration via TRI-STATE control. Use Value: ±6.0V differential swing ensures >2V noise margin over long runs; 200ns edge rates prevent intersymbol interference at 1Mbps. |
Use Scenario: High-reliability data link between CNC controller and servo drive in factory automation. IC Role / Device Role / Timing Role: Dual-channel RS-422 transmitter enabling full-duplex communication with precise timing alignment. Use Value: Matched propagation delays (tPDH/tPDL ≤200ns) maintain skew <50ns between channels for synchronized command-response cycles. |
| Multidrop RS-423 Sensor Network | Legacy Equipment Interface Adapter |
|
Use Scenario: Interfacing eight analog sensor transmitters to a central DAQ system using daisy-chained RS-423 wiring. IC Role / Device Role / Timing Role: Quad RS-423 driver with slew-controlled edges to minimize crosstalk across shared cable harness. Use Value: Adjustable rise time (via SLEW pin capacitor) reduces near-end crosstalk by >15dB, enabling stable 250kbps operation on 450Ω lines. |
Use Scenario: Retrofitting obsolete AM26LS30-based serial interface boards in test equipment with RoHS-compliant replacement. IC Role / Device Role / Timing Role: Pin- and function-compatible RS-422/RS-423 driver supporting identical timing and voltage thresholds. Use Value: Direct drop-in replacement preserves existing firmware, layout, and signal integrity - zero revalidation effort required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-422/RS-423 line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM26LS30CDR | Same SOIC-16 pinout, identical RS-422 functionality, but lacks RS-423 mode and SLEW control | No mode-select flexibility; limited to dual-diff only; no rise-time adjustment | Choose when only RS-422 operation is needed and legacy AM26LS30 footprint must be preserved |
| SN65LBC179D | RS-485/RS-422 transceiver (integrated receiver), higher ESD rating (±15kV), wider temp range (−40°C to +125°C) | Full transceiver (driver + receiver); not pin-compatible; requires separate enable logic | Choose for new designs needing bidirectional communication, extended temperature, or enhanced robustness |
Compared with AM26LS30CDR, DS3691M adds RS-423 mode and slew control at same pinout; compared with SN65LBC179D, DS3691M offers unidirectional driver-only simplicity and direct AM26LS30 compatibility but lacks receiver integration and extended temperature support.
Availability
DS3691M is available at Aetrix Electronics and suitable for industrial automation, factory floor serial communications, and legacy equipment upgrades requiring stable component supply and long-term obsolescence mitigation.
Supply support for DS3691M 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.
The DS3691M belongs to TI's legacy interface line driver family, engineered specifically for EIA RS-422/RS-423 compliant serial communication in industrial control and instrumentation systems.
FAQ
What is the operating temperature range for DS3691M?
The DS3691M is specified for operation from 0°C to +70°C ambient temperature. This range aligns with commercial-grade industrial applications and matches the datasheet's stated TA specification. The DS3691M does not support extended or automotive temperature grades; for −40°C to +125°C operation, consider alternatives like SN65LBC179D. DS3691M thermal derating begins above 25°C per SOIC package limits.
Does DS3691M support both RS-422 and RS-423 standards simultaneously?
No, DS3691M supports RS-422 or RS-423 operation exclusively based on the MODE pin state: low (≤0.8V) configures dual RS-422 differential drivers; high (≥2V) configures quad RS-423 single-ended drivers. The DS3691M cannot operate in both modes at once, and mode switching requires stable logic level assertion before data transmission.
Is DS3691M pin-compatible with AM26LS30?
Yes, DS3691M is pin-compatible with AM26LS30 in SOIC-16 package (drawing D), sharing identical pin assignments for VCC, VEE, GND, inputs, and differential outputs. This allows direct replacement in existing AM26LS30 layouts. DS3691M extends functionality with MODE and SLEW pins, which are NC on AM26LS30 but must be tied appropriately (MODE to GND/VCC, SLEW to capacitor or GND) for DS3691M operation.
What is the purpose of the SLEW pin on DS3691M?
The SLEW pin on DS3691M enables external adjustment of output rise time in RS-423 mode using a capacitor to ground. This feature suppresses near-end crosstalk in multidrop wiring by slowing edge rates. In RS-422 mode, SLEW has no effect. DS3691M datasheet cautions against using slew control in multipoint RS-422 configurations due to signal integrity risks.
Can DS3691M outputs remain high-impedance when power is removed?
Yes, DS3691M outputs exhibit non-clamping behavior when powered off: they do not sink or source current and will not distort bus voltage. This is confirmed by absolute maximum ratings specifying ±15V output voltage tolerance with VCC/VEE = 0V, and by the "Outputs Will Not Clamp Line with Power Off" feature statement. This behavior protects receivers on shared buses during hot-swap or partial-power-down scenarios.
DS3691M 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, RS423
- Number of Drivers/Receivers:
- 2/0
- 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
DS3691M FAQ
1.How can I place an order for DS3691M through Aetrix?
Please submit a Request for Quotation (RFQ) for DS3691M 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 DS3691M reliable?
The price and inventory of DS3691M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS3691M is usually 5 days.
3.What payment methods are accepted for DS3691M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS3691M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS3691M?
DS3691M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS3691M 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 DS3691M?
For technical support, including DS3691M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS3691M requirements.
6.How does Aetrix verify that DS3691M is sourced from the original manufacturer or authorized distributors?
All DS3691M 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 DS3691M meets industry standards.
7.What is the process for return or replacement of DS3691M?
All DS3691M units undergo pre-shipment inspection (PSI). If there is an issue with DS3691M, 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 DS3691M part is unused and in its original packaging.
Return procedure for DS3691M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS3691M Tags
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ATA6561-GAQW-N
Microchip Technology
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ATA6561-GBQW-N
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