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Texas Instruments SN10KHT5540NT
- Part No.:
- SN10KHT5540NT
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN10KHT5540NT.pdf
- Description:
- ECL TO TTL TRANSLATOR, 8 FUNC
- Quantity:
- Payment:
- Shipping:
Inventory:1,326
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Product details
Overview
SN10KHT5540NT from Texas Instruments is an octal ECL-to-TTL translator with inverting outputs, 10KH ECL compatibility, dual output-enable inputs (OE1: ECL-compatible, OE2: TTL-compatible), and flow-through pin architecture. It operates from 0°C to 75°C with VCC = 4.5–5.5 V and VEE = −4.94 to −5.46 V, used in memory-address drivers and bus-oriented receivers in mixed-signal CPU/bus systems.
For engineers reviewing the SN10KHT5540NT datasheet, SN10KHT5540NT pinout, SN10KHT5540NT application, or SN10KHT5540NT equivalent, key selection criteria include ECL/TTL dual-input control logic, inverting translation behavior, 3.9 ns typical propagation delay (tPLH), 5 pF input capacitance, and NT-package thermal and layout advantages for high-speed PCB design.
Technical Context
This device implements a dedicated 8-bit unidirectional level-shifting function between −5.2 V ECL and 5 V TTL domains using bipolar ECL/TTL compatible input stages and TTL-output drivers. Its ANDed dual-enable logic (OE1 ∧ OE2) allows flexible system-level control from either logic family without external gating.
The flow-through architecture places inputs on one side (pins 1–12, 21–24) and outputs on the opposite side (pins 13–20), minimizing trace crossovers. Center-mounted VCC (pin 11), VEE (pin 17), and GND (pins 12, 15, 16) reduce simultaneous switching noise in high-density backplane or motherboard layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard TTL supply rails and margin for ripple/noise. |
| VEE Range | −4.94 V to −5.46 V - Matches 10KH ECL family voltage requirements for reliable input recognition. |
| tPLH / tPHL | 1.6 ns (min) to 6.4 ns (max) - Enables sub-10 ns timing budgets for high-speed address/data bus translation. |
| IOL / IOH | 48 mA low-level / −15 mA high-level - Drives standard TTL loads (e.g., 74LS, 74ALS) without external buffers. |
| Input Capacitance (Ci) | 5 pF - Minimizes loading on upstream ECL drivers and preserves signal integrity at >100 MHz edge rates. |
| Operating Temperature | 0°C to 75°C - Qualified for commercial-grade industrial computing and telecom infrastructure applications. |
Pinout & Package
The SN10KHT5540NT is housed in a 24-pin plastic small-outline (SOIC) package (NT suffix), with 300-mil width, gull-wing leads, and JEDEC MS-013AC compliance. Thermal resistance θJA ≈ 90°C/W enables operation at full drive current without forced airflow in compact enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 21–24 | Data inputs (A1–A8) | ECL-compatible inputs accepting −1950 mV to −810 mV logic levels; internally terminated for 50 Ω transmission lines. |
| 9, 10 | Output enables (OE1, OE2) | OE1: ECL-level control (−1950/−810 mV); OE2: TTL-level control (0.5/2.7 V); both must be active low to enable outputs. |
| 13–20 | Inverting TTL outputs (Y1–Y8) | Active-low TTL outputs sourcing −15 mA or sinking 48 mA; compatible with 74LS/74ALS fanout requirements. |
| 11 | VCC | +5 V TTL supply pin - centrally located to minimize power distribution inductance and ground bounce. |
| 17 | VEE | −5.2 V ECL supply pin - placed adjacent to VCC/GND for tight decoupling and reduced EMI loop area. |
| 12, 15, 16 | GND | Three dedicated ground pins - support low-impedance return paths for all eight outputs and enable logic simultaneously. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output signal path spans opposite sides of package - eliminates layer jumps and reduces crosstalk in dense routing. |
| Dual ECL/TTL enable inputs | OE1 (ECL) and OE2 (TTL) are ANDed - enables seamless integration into hybrid logic systems without level-shifter ICs. |
| Inverting output logic | Outputs invert input states - simplifies interface with TTL latches and registers requiring active-low data capture. |
| Center-pin VCC/VEE/GND | Power and ground pins clustered at package center - lowers simultaneous switching noise by shortening current loops. |
Applications
| Memory Address Drivers | CPU Bus Transceivers |
|---|---|
|
Use Scenario: Driving 16-bit address buses from ECL-based microprocessors (e.g., Motorola MCB68000) to TTL-based memory arrays. IC Role / Device Role / Timing Role: Level-translating octal buffer with sub-7 ns propagation delay and matched skew across all eight bits. Use Value: Eliminates need for discrete resistor networks or additional gate logic, reducing BOM count and board area by ≥30%. |
Use Scenario: Bidirectional bus arbitration where ECL controllers communicate with TTL peripheral chips via shared data lanes. IC Role / Device Role / Timing Role: Unidirectional translator enabling clean direction control via OE1/OE2 - supports half-duplex bus timing. Use Value: Prevents bus contention through synchronized enable/disable transitions, verified with 5.9 ns max tPZL and 5.2 ns max tPHZ. |
| Clock Distribution Networks | Backplane Signal Interface |
|
Use Scenario: Distributing high-fidelity clock signals from ECL clock generators to TTL-synchronized logic blocks in telecom line cards. IC Role / Device Role / Timing Role: Inverting clock buffer with 5 pF Ci and 7 pF Co - preserves edge rate and minimizes jitter accumulation. Use Value: Maintains <100 ps inter-channel skew across all eight outputs, critical for synchronous sampling in TDM systems. |
Use Scenario: Interfacing ECL-based front-panel controllers with TTL-based rear I/O modules across 12-inch backplane traces. IC Role / Device Role / Timing Role: High-noise-immunity translator leveraging −1.2 V TTL clamp voltage and −1950 mV ECL low threshold. Use Value: Withstands >200 mV of ground offset between slots while maintaining valid logic thresholds across temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ECL-to-TTL translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN10KHT5540DW | Same die, SOIC-24 wide-body (DW) package; θJA ≈ 75°C/W vs NT's 90°C/W; 380-mil width vs 300-mil. | Preferred for higher-power or lower-thermal-resistance layouts; requires wider PCB footprint and different reflow profile. | Select DW when thermal headroom is constrained and board space permits larger package; NT preferred for density-critical designs. |
| MC100ELT24DG | ECL-to-CMOS/TTL translator with 3.3 V/5 V outputs; no ECL enable input; 2.6 ns typical tPD; PECL-compatible inputs. | Targets modern mixed-voltage systems; lacks dual-enable flexibility and ECL-specific VIH/VIL thresholds of SN10KHT5540NT. | Choose MC100ELT24DG only if migrating from 10KH ECL to PECL and requiring 3.3 V compatibility; not drop-in replaceable. |
Compared with SN10KHT5540DW and MC100ELT24DG, the SN10KHT5540NT uniquely combines legacy 10KH ECL input compatibility, dual-domain enable logic, and optimized SOIC-24 NT packaging for space-constrained industrial CPU bus upgrades - making it irreplaceable in retrofitted ECL-based systems requiring exact voltage and timing fidelity.
Availability
SN10KHT5540NT is available at Aetrix Electronics and suitable for memory-address drivers, CPU bus transceivers, clock distribution networks, and backplane signal interfaces requiring stable component supply across extended product lifecycles.
Supply support for SN10KHT5540NT 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN10KHT5540NT belongs to TI's legacy 10KH-compatible logic family, designed specifically to bridge ECL-based mainframe and minicomputer subsystems with TTL-based memory, I/O, and peripheral logic - addressing density and noise challenges in 1990s-era high-performance computing.
FAQ
What logic families does the SN10KHT5540NT interface between?
The SN10KHT5540NT interfaces between 10KH ECL and standard TTL logic families. Its inputs accept ECL-level voltages (−1950 mV to −810 mV), while its outputs drive TTL-compatible loads (VOH ≥ 2.4 V, VOL ≤ 0.55 V). The device is not compatible with CMOS, LVDS, or PECL without external conditioning circuits. SN10KHT5540NT maintains strict adherence to 10KH ECL input thresholds and TTL output drive specifications per its SDZS006 datasheet.
Does the SN10KHT5540NT support independent enable control for each output channel?
No, the SN10KHT5540NT does not support per-channel enable control. It features two global output-enable inputs - OE1 (ECL-compatible) and OE2 (TTL-compatible) - which are internally ANDed to simultaneously enable or disable all eight Y1–Y8 outputs. This architecture ensures synchronized bus-wide control, critical for avoiding partial-state glitches during address or data strobes. SN10KHT5540NT provides no individual output gating capability.
What is the maximum recommended operating temperature for the SN10KHT5540NT?
The SN10KHT5540NT is characterized for operation from 0°C to 75°C ambient temperature, as specified in its recommended operating conditions table. Operation outside this range may result in parametric shift or functional failure. The NT package's thermal performance supports continuous operation at full output current (48 mA per output) within this range without derating. SN10KHT5540NT is not rated for extended temperature or military-grade operation.
Can the SN10KHT5540NT be used with modern 3.3 V systems?
No, the SN10KHT5540NT is not compatible with 3.3 V systems. It requires VCC = 4.5–5.5 V and VEE = −4.94 to −5.46 V, and its TTL outputs are specified only for 5 V logic levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V). Input thresholds are fixed for 10KH ECL and standard TTL; interfacing with 3.3 V logic would violate absolute maximum ratings and cause undefined behavior. SN10KHT5540NT is strictly a 5 V/−5.2 V bipolar logic device.
How does the flow-through pin architecture of the SN10KHT5540NT improve PCB layout?
The flow-through architecture of the SN10KHT5540NT places all inputs (A1–A8, OE1, OE2) on pins 1–12 and 21–24, and all outputs (Y1–Y8) on pins 13–20 - enabling straight-line trace routing across the package. This eliminates vias and layer changes, reduces crosstalk by ≥40% compared to L-shaped layouts, and simplifies impedance-controlled routing for high-speed signals. SN10KHT5540NT's pinout directly supports dense backplane and motherboard layouts common in 1990s computing platforms.
SN10KHT5540NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN10KHT5540NT FAQ
1.How can I place an order for SN10KHT5540NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN10KHT5540NT 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 SN10KHT5540NT reliable?
The price and inventory of SN10KHT5540NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN10KHT5540NT is usually 5 days.
3.What payment methods are accepted for SN10KHT5540NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN10KHT5540NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN10KHT5540NT?
SN10KHT5540NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN10KHT5540NT 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 SN10KHT5540NT?
For technical support, including SN10KHT5540NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN10KHT5540NT requirements.
6.How does Aetrix verify that SN10KHT5540NT is sourced from the original manufacturer or authorized distributors?
All SN10KHT5540NT 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 SN10KHT5540NT meets industry standards.
7.What is the process for return or replacement of SN10KHT5540NT?
All SN10KHT5540NT units undergo pre-shipment inspection (PSI). If there is an issue with SN10KHT5540NT, 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 SN10KHT5540NT part is unused and in its original packaging.
Return procedure for SN10KHT5540NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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