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Texas Instruments SN55115J
- Part No.:
- SN55115J
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN55115J.pdf
- Description:
- IC TRANSCEIVER 0/2 16CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,903
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Product details
Overview
SN55115J from Texas Instruments is a military-grade dual differential line receiver IC designed for high-noise industrial and defense data bus systems. It features ±15-V common-mode input voltage range, TTL-compatible open-collector/totem-pole outputs, and individual strobe-controlled channel enable/disable. It operates across –55°C to 125°C on a single 5-V supply and is used with SN55113/SN55114 drivers in RS-422-style party-line configurations.
For engineers reviewing the SN55115J datasheet, SN55115J pinout, SN55115J application, or SN55115J equivalent, key selection considerations include its wide common-mode rejection, strobe-gated output control, built-in 130-Ω line-terminating resistor option, and compatibility with legacy National DS9615 receivers in harsh-temperature environments.
Technical Context
The SN55115J implements two independent differential comparators with programmable response-time control via external RTC capacitors and per-channel strobe inputs that force outputs high when low. Its input stage rejects large common-mode noise while detecting small differential signals (±500 mV thresholds), and each receiver provides dual-terminal outputs (YS sink + YP active pullup) enabling flexible wired-AND logic or totem-pole drive.
It supports differential line operation with optional internal 130-Ω termination, operates from a single 4.5–5.5 V supply, and delivers TTL-level outputs (VOH ≥ 2.4 V at –5 mA, VOL ≤ 0.4 V at 15 mA) with propagation delays of 18–50 ns (tPLH) and 20–50 ns (tPHL) under standard test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across military-grade power rail tolerances |
| Common-Mode Input Range | ±15 V - enables reliable reception over noisy long-line twisted-pair buses |
| Differential Threshold | ±500 mV - defines minimum detectable signal swing for robust noise margin |
| Output Drive Capability | IOH = –5 mA / IOL = 15 mA - supports direct TTL fanout and wired-AND bus topologies |
| Operating Temperature | –55°C to 125°C - qualified for extended-range military and aerospace applications |
| Propagation Delay | tPLH/tPHL = 18–50 ns - enables reliable operation up to ~10 MHz with proper RTC capacitance |
| Line-Terminating Resistor | 130 Ω (typical) - reduces reflections on matched-impedance transmission lines without external components |
Pinout & Package
SN55115J is housed in a 16-pin Ceramic Dual In-line Package (CDIP-J), hermetically sealed for high-reliability military use. The package has 0.3-inch body width, 0.1-inch lead pitch, and is rated for 300°C soldering at 1.6 mm from case for 60 seconds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1YS, 2YS | Sink output terminal | Active-low open-collector output; requires external pullup for logic-high state |
| 1YP, 2YP | Active pullup terminal | Provides totem-pole-like sourcing capability when tied to corresponding YS pin |
| 1STRB, 2STRB | Channel strobe input | Low-active enable: forces outputs high when asserted, disabling receiver function |
| 1A/1B, 2A/2B | Differential input pair | Accepts balanced signals; threshold referenced to internal VT+ (500 mV) and VT– (–500 mV) |
| 1RT, 2RT | Response-time control | Connects to external capacitor to set bandwidth and reduce susceptibility to high-frequency noise |
| 1RTC, 2RTC | Termination control | Enables internal 130-Ω resistor between A and B inputs for impedance matching |
| VCC, GND | Power supply terminals | Single 5-V supply with decoupling required at point-of-load for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent receivers | Enables simultaneous monitoring of two differential buses without cross-talk or shared timing constraints |
| Strobe-gated channel disable | Permits time-multiplexed bus arbitration by forcing outputs high during inactive periods |
| Configurable output topology | Supports either open-collector (wired-AND) or active pullup (totem-pole) modes via YS/YP pin pairing |
| Built-in line termination | Reduces PCB component count and layout complexity by integrating 130-Ω termination resistors per channel |
| Military temperature qualification | Validated for continuous operation from –55°C to 125°C, meeting MIL-PRF-38535 requirements |
Applications
| Industrial Data Acquisition | Military Vehicle Bus Systems |
|---|---|
Use Scenario: High-noise factory floor sensor networks transmitting analog-to-digital converter outputs over 10+ meter twisted-pair runs. IC Role / Device Role / Timing Role: Differential receiver converting RS-422-like signals into clean TTL logic levels for microcontroller input capture. Use Value: ±15-V common-mode range rejects EMI from motor drives and welding equipment, ensuring data integrity without additional isolation. | Use Scenario: Avionics subsystem interconnect where multiple LRUs share a common serial data bus under extreme thermal cycling. IC Role / Device Role / Timing Role: Strobe-controlled receiver enabling time-sliced access to shared MIL-STD-1553 auxiliary channels. Use Value: –55°C to 125°C operation eliminates derating concerns; built-in termination simplifies ruggedized backplane design. |
| Railway Signaling Interfaces | Test Equipment Signal Conditioning |
Use Scenario: Track-side signaling units interfacing with centralized traffic control systems using legacy differential protocols. IC Role / Device Role / Timing Role: Level translator and noise filter between field sensors and central PLC controllers over unshielded cable runs. Use Value: 130-Ω internal termination matches typical railway cable impedance, minimizing reflections and bit errors at 1 Mbps. | Use Scenario: Automated test fixtures validating communication integrity of DUTs under conducted EMI stress conditions. IC Role / Device Role / Timing Role: Reference receiver verifying differential signal fidelity and timing margins in production burn-in racks. Use Value: Individual RTC pins allow precise bandwidth limiting to reject switching noise while preserving edge integrity for jitter analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual differential receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN75115N | Commercial temperature range (0°C to 70°C); PDIP package; RoHS-compliant NiPdAu finish | Intended for commercial-grade instrumentation and lab equipment, not extended-temperature deployments | Select SN75115N only when full military temp range and hermetic CDIP packaging are unnecessary |
| DS9615M | Pin-compatible predecessor; identical functional behavior but obsolete manufacturing process and no current TI support | Legacy drop-in replacement in existing National Semiconductor designs; no new qualification data available | Prefer SN55115J for new designs requiring documented reliability, lifecycle support, and TI-backed documentation |
Compared with SN75115N and DS9615M, SN55115J uniquely combines military-grade temperature performance, hermetic CDIP packaging, and ongoing TI production support-making it the only choice for new high-reliability embedded systems requiring guaranteed long-term availability and radiation-tolerant construction.
Availability
SN55115J is available at Aetrix Electronics and suitable for industrial data acquisition, military vehicle bus systems, and railway signaling applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN55115J 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 high-reliability components for industrial, automotive, and defense markets.
The SN55115J belongs to TI's military-grade interface IC portfolio, engineered specifically for robust differential data reception in electrically hostile, thermally extreme environments where signal integrity and long-term reliability are non-negotiable.
FAQ
What is the maximum operating frequency supported by SN55115J?
The SN55115J does not specify a fixed maximum clock frequency but achieves reliable operation up to approximately 10 MHz when configured with appropriate response-time-control (RTC) capacitance. Typical performance shows tPLH/tPHL of 18–50 ns, and Figure 14 in the datasheet correlates RTC capacitor value with achievable fmax - e.g., 0.01 µF yields ~1 MHz, while 100 pF supports >10 MHz. Actual usable frequency depends on load, termination, and noise environment. SN55115J must be evaluated per application-specific signal integrity requirements.
Does SN55115J require external pull-up resistors on its outputs?
SN55115J supports both open-collector and active pullup output configurations. When using YS-only (sink) outputs, external pull-up resistors are required to establish a valid high logic level. However, when YS and YP terminals are tied together per channel, the device operates in active pullup (totem-pole) mode and does not require external pull-ups. This dual-mode flexibility allows SN55115J to interface directly with TTL loads or support wired-AND bus architectures without added components.
Can SN55115J replace DS9615 in existing designs?
Yes, SN55115J is explicitly designed to be interchangeable with National Semiconductor's DS9615 line receivers, as stated in the datasheet. Pinout, electrical characteristics, and functional behavior match closely - including strobe control, RTC/RTC functionality, and output drive strength. SN55115J extends compatibility with enhanced military temperature range (–55°C to 125°C) and modern TI manufacturing controls. For legacy DS9615 designs, SN55115J serves as a fully qualified, actively supported drop-in replacement.
What is the purpose of the RTC and RTC pins on SN55115J?
SN55115J uses RTC (Response-Time Control) and RTC (Termination Control) pins to independently configure each channel's dynamic response and line-matching behavior. RTC connects to an external capacitor to adjust bandwidth and suppress high-frequency noise; larger capacitance lowers bandwidth and improves noise immunity. RTC enables or disables the internal 130-Ω line-terminating resistor between A and B inputs - critical for impedance matching on controlled-impedance traces. These per-channel controls make SN55115J adaptable to diverse cable lengths and noise profiles without redesign.
Is SN55115J RoHS compliant?
No, SN55115J is not RoHS compliant. It uses SnPb (tin-lead) lead finish and is manufactured in a non-RoHS-compliant process, consistent with its military-grade CDIP-J package and QML-38535 qualification. TI lists SN55115J as "No" under RoHS in the official Package Option Addendum. For RoHS-compliant alternatives, consider SN75115N (PDIP) or SN75115DR (SOIC), though these lack the extended temperature range and hermetic sealing of SN55115J.
SN55115J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Receiver
- Protocol:
- -
- Number of Drivers/Receivers:
- 0/2
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-CDIP
SN55115J FAQ
1.How can I place an order for SN55115J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN55115J 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 SN55115J reliable?
The price and inventory of SN55115J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN55115J is usually 5 days.
3.What payment methods are accepted for SN55115J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN55115J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN55115J?
SN55115J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN55115J 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 SN55115J?
For technical support, including SN55115J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN55115J requirements.
6.How does Aetrix verify that SN55115J is sourced from the original manufacturer or authorized distributors?
All SN55115J 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 SN55115J meets industry standards.
7.What is the process for return or replacement of SN55115J?
All SN55115J units undergo pre-shipment inspection (PSI). If there is an issue with SN55115J, 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 SN55115J part is unused and in its original packaging.
Return procedure for SN55115J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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