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Texas Instruments UCC5630MWP/81364
- Part No.:
- UCC5630MWP/81364
- Manufacturer:
- Texas Instruments
- Category:
- Signal Terminators
- Package:
- -
- Datasheet:
-
UCC5630MWP/81364.pdf
- Description:
- OBSOLETE SINCE 1999
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Product details
Overview
UCC5630MWP/81364 from Texas Instruments is a multi-mode SCSI terminator IC supporting both single-ended (SE) and low-voltage differential (LVD) termination for SPI-2, SPI, and Fast-20 interfaces. It operates from 2.7V to 5.25V, provides auto-selection between SE and LVD modes via DIFFB sensing, and features 100Ω differential impedance, 105Ω typical termination resistance, and 3pF channel capacitance - critical for high-speed SCSI bus signal integrity.
For engineers reviewing the UCC5630MWP/81364 datasheet, UCC5630MWP/81364 pinout, UCC5630MWP/81364 application, or UCC5630MWP/81364 equivalent, key selection considerations include its dual-mode auto-sensing capability, thermal packaging for <150°C junction temperature, DISCNCT-controlled disable mode (5µA standby), and strict compliance with SCSI Parallel Interface timing and bias requirements.
Technical Context
The UCC5630MWP/81364 integrates three independent regulator outputs (1.25V, 1.3V, and 2.7V) to power internal circuitry and bias SCSI bus lines, with dedicated DIFSENS line drive and DIFFB input for automatic mode detection. Its master/slave logic enables coordinated termination across multiple devices on the same bus, while HIPD, LVD, and SE status outputs provide real-time interface mode reporting.
It implements failsafe differential biasing with 100–110Ω differential termination impedance and 110–165Ω common-mode impedance, maintaining ±125mV common-mode bias under tri-state conditions. The SSOP-36 MWP package includes 9 differential pairs (L1+/- through L9+/-), HS/GND thermal pads, and dedicated DISCNCT and MSTR/SLV control inputs for system-level bus topology management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.25V TRMPWR - supports mixed-voltage SCSI systems including 3.3V LVD and 5V SE legacy environments |
| Differential Impedance | 100Ω to 110Ω - matches SPI-2 LVD transmission line requirements for skew budget compliance up to Fast-80 |
| Single-Ended Impedance | 102.3Ω to 117.7Ω - maintains IEEE 1284-compliant SE termination accuracy across temperature and voltage |
| Channel Capacitance | 3pF (SE), 3.5pF (LVD) - minimizes signal rise/fall time degradation on 9-line SCSI bus traces |
| Standby Current | 35µA in DISCNCT mode - enables ultra-low-power bus termination when device is not at physical bus end |
| Regulator Outputs | 1.25V (±0.1V), 1.3V (±0.1V), 2.7V (±0.3V) - powers internal bias networks and drives DIFSENS line without external regulators |
| DIFFB Thresholds | 0.6–0.7V (SE), 1.9–2.2V (LVD) - enables unambiguous auto-detection of connected SCSI device types |
Pinout & Package
UCC5630MWP/81364 is housed in a 36-pin SSOP (MWP) package with exposed thermal pad (HS/GND pins). Pin layout supports 9 differential SCSI signal pairs (L1+/- to L9+/-), dedicated control inputs (DISCNCT, MSTR/SLV, DIFFB), status outputs (LVD, SE, HIPD), and three regulator outputs (REG, DIFSENS, DIFFB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5–6, 8–10, 12–14, 17–18, 20–22, 24–25, 27–29, 31–32 | L1+ to L9+, L1– to L9– | 9 bidirectional SCSI signal lines - configured as SE terminators or LVD differential pairs based on DIFFB state |
| 19 | MSTR/SLV | Mode select input - enables 1.3V regulator only in master configuration; function deprecated in later generations |
| 17 | DISCNCT | Active-low enable - disables all terminators and reduces supply current to 35µA when pulled high |
| 21 | DIFFB | Differential sense input - detects SE (0.6–0.7V) or LVD (1.9–2.2V) bus voltage to auto-select termination mode |
| 33, 34, 35 | SE, LVD, HIPD | Status outputs - TTL-compatible open-drain signals indicating detected interface type (SE/LVD) or HVD fault condition |
| 20, 36 | TRMPWR, REG | Main supply input and regulator bypass - requires 4.7µF capacitor on REG to stabilize 1.25V/1.3V/2.7V regulators |
| 2–4, 7, 11, 15–16, 23, 26, 30 | HS/GND | Thermal ground pads - must connect to large PCB copper areas to maintain junction temperature ≤150°C at 2W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Auto-selection between SE and LVD modes | Eliminates manual jumpering or firmware configuration - DIFFB voltage level directly controls internal termination topology |
| Differential failsafe bias | Maintains 100–125mV common-mode bias on SCSI bus even when drivers are tri-stated, preventing false signaling |
| Thermal packaging with HS/GND pads | Enables 2W power dissipation in SSOP-36 by routing heat to PCB plane - extends MTBF in dense backplane applications |
| Master/slave coordination logic | Allows one UCC5630MWP/81364 to drive DIFSENS bus while others monitor DIFFB, ensuring consistent mode selection across multi-terminator systems |
| 3pF channel capacitance | Reduces capacitive loading on high-speed SCSI lines - preserves signal edge rates required for Fast-40 and Fast-80 timing budgets |
Applications
| SCSI-2 Backplane Termination | Fast-40 Server Storage Interface |
|---|---|
|
Use Scenario: Termination of 9-signal SCSI bus in modular server backplanes where both legacy SE and modern LVD peripherals coexist. IC Role / Device Role / Timing Role: Dual-mode terminator providing impedance-matched termination and auto-sensed interface compatibility at bus endpoints. Use Value: Eliminates need for separate SE and LVD termination modules - reduces BOM count and PCB footprint while maintaining Fast-20/Fast-40 timing margins. |
Use Scenario: High-density RAID controller card requiring reliable termination for 160MB/s Fast-40 data transfers over ribbon cables. IC Role / Device Role / Timing Role: Low-capacitance (3pF) LVD terminator with 100Ω differential impedance to minimize signal reflection and jitter accumulation. Use Value: Enables stable operation at 40MHz clock rate by meeting SPI-2 skew budget requirements - verified via 0.1pF inter-pair capacitance balancing on MWP package. |
| Legacy SCSI-1 to SPI-2 Migration | Industrial Embedded SCSI Boot Interface |
|
Use Scenario: Retrofitting older industrial controllers with SPI-2 support while retaining compatibility with existing SE peripherals. IC Role / Device Role / Timing Role: Mode-transparent terminator that adapts to attached device type without host software intervention. Use Value: Avoids firmware rework - DIFFB sensing automatically configures 102Ω SE or 100Ω LVD termination, preserving system boot reliability. |
Use Scenario: Ruggedized medical imaging system using SCSI for boot ROM access and diagnostic storage, operating in extended temperature range. IC Role / Device Role / Timing Role: Thermally robust terminator with HS/GND thermal pads and –55°C to +150°C junction rating. Use Value: Sustains 2W dissipation during sustained boot sequences - validated via thermal packaging design for >10-year field MTBF in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCSI termination applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AMCC 53C810 | Integrated SCSI controller with embedded termination - no discrete termination IC functionality; requires external 100Ω resistors for LVD | Replaces entire SCSI controller subsystem - not a drop-in replacement for UCC5630MWP/81364's dedicated termination role | Select only when redesigning from scratch with integrated controller architecture; incompatible with existing UCC5630MWP/81364-based termination layouts |
| MAX3243E | RS-232 transceiver with ±15kV ESD protection - no SCSI termination capability, no DIFFB sensing, no multi-mode regulation | Designed for serial UART interfaces - lacks SCSI-specific biasing, impedance matching, or status reporting features | Not functionally comparable; only relevant if misidentifying UCC5630MWP/81364 as general-purpose interface IC rather than SCSI-specific terminator |
Compared with AMCC 53C810 and MAX3243E, the UCC5630MWP/81364 uniquely delivers dedicated, auto-sensing SCSI termination in a single IC - offering precise 100Ω LVD/105Ω SE impedance, integrated regulators, and thermal packaging optimized for backplane deployment, whereas alternatives either embed termination in controllers or serve unrelated interface standards.
Availability
UCC5630MWP/81364 is available at Aetrix Electronics and suitable for SCSI-2 backplane termination, Fast-40 storage interface design, and legacy-to-SPI-2 migration projects requiring stable component supply and long-term obsolescence management.
Supply support for UCC5630MWP/81364 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The UCC5630MWP/81364 belongs to TI's legacy SCSI interface product line, designed specifically to simplify transition from single-ended to low-voltage differential SCSI while maintaining backward compatibility and minimizing board space.
FAQ
What is the primary function of the UCC5630MWP/81364 in a SCSI system?
The UCC5630MWP/81364 serves as an auto-sensing, multi-mode terminator for SCSI Parallel Interface systems. It provides impedance-matched termination for both single-ended and low-voltage differential (LVD) SCSI buses, detecting interface type via the DIFFB input and configuring internal 100Ω LVD or 105Ω SE termination accordingly. Its role is strictly physical-layer bus termination - not protocol handling or data buffering - and it ensures signal integrity at speeds up to Fast-80.
Can the UCC5630MWP/81364 be used with high-voltage differential (HVD) SCSI devices?
No, the UCC5630MWP/81364 cannot be used with HVD SCSI devices. It explicitly shuts down upon detecting HVD-level signals on the DIFFB line, asserting HIPD to indicate fault condition. The pinout, bias voltage, current requirements, and power handling of HVD (EIA-485) are incompatible with the UCC5630MWP/81364's LVD/SE architecture. Attempting connection risks bus contention and improper termination.
How does the DISCNCT pin affect power consumption of the UCC5630MWP/81364?
The DISCNCT pin is an active-low enable input: pulling it high disables all termination functions and reduces TRMPWR supply current to 35µA. In this state, regulators remain powered but output drivers are tri-stated, leakage is limited to 400nA per line, and status outputs (LVD/SE/HIPD) become invalid. This mode is intended for terminators located mid-bus, allowing dynamic power gating without removing the device from the PCB.
What is the significance of the HS/GND pins on the UCC5630MWP/81364 package?
The HS/GND pins (pins 2–4, 7, 11, 15–16, 23, 26, 30) are thermal ground pads connected internally to the die substrate. They must be soldered to large copper areas on the PCB to dissipate up to 2W of heat and maintain junction temperature within –55°C to +150°C limits. Without proper thermal connection, the UCC5630MWP/81364 may exceed safe operating temperature during sustained Fast-40 operation, triggering thermal shutdown or reducing MTBF.
Does the UCC5630MWP/81364 require external passive components for basic operation?
Yes, the UCC5630MWP/81364 requires three external components for guaranteed operation: a 4.7µF capacitor on the REG pin for regulator stability, a 0.1µF capacitor plus 20kΩ resistor on DIFFB for noise filtering, and a 0.1µF capacitor on DIFSENS for bus line conditioning. These are specified in the datasheet's application diagrams and are necessary to meet electrical characteristics - omitting them causes unstable mode detection or regulator oscillation.
UCC5630MWP/81364 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Terminations:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
UCC5630MWP/81364 FAQ
1.How can I place an order for UCC5630MWP/81364 through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC5630MWP/81364 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 UCC5630MWP/81364 reliable?
The price and inventory of UCC5630MWP/81364 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC5630MWP/81364 is usually 5 days.
3.What payment methods are accepted for UCC5630MWP/81364?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC5630MWP/81364 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC5630MWP/81364?
UCC5630MWP/81364 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC5630MWP/81364 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 UCC5630MWP/81364?
For technical support, including UCC5630MWP/81364 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC5630MWP/81364 requirements.
6.How does Aetrix verify that UCC5630MWP/81364 is sourced from the original manufacturer or authorized distributors?
All UCC5630MWP/81364 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 UCC5630MWP/81364 meets industry standards.
7.What is the process for return or replacement of UCC5630MWP/81364?
All UCC5630MWP/81364 units undergo pre-shipment inspection (PSI). If there is an issue with UCC5630MWP/81364, 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 UCC5630MWP/81364 part is unused and in its original packaging.
Return procedure for UCC5630MWP/81364:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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