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Home > Products > Integrated Circuits (ICs) > Logic > Translators, Level Shifters

Texas Instruments SN10KHT5540DW

Name: SN10KHT5540DW
Brand: Texas Instruments
SKU: SN10KHT5540DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN10KHT5540DW

Manufacturer:: Texas Instruments

Category:: Translators, Level Shifters

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Datasheet:: SN10KHT5540DW.pdf

Description:: ECL TO TTL TRANSLATOR, 8 FUNC

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Product details

Overview

SN10KHT5540DW from Texas Instruments is an octal ECL-to-TTL translator IC 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, designed for memory-address drivers and bus-oriented receivers in mixed-signal CPU/bus systems.

For engineers reviewing the SN10KHT5540DW datasheet, SN10KHT5540DW pinout, SN10KHT5540DW application, or SN10KHT5540DW equivalent, key selection considerations include ECL/TTL bidirectional interface support, 3.9 ns typical propagation delay (tPLH), −15 mA high-level output drive, 48 mA low-level output sink capability, and DW package thermal and layout advantages for high-speed digital systems.

Technical Context

This device implements a dual-voltage-domain translation function: ECL inputs (−1950 mV to −735 mV logic levels) interface with TTL outputs (0.38 V VOL, 2.4 V VOH at −15 mA), using separate VEE (−5.2 V nominal) and VCC (5 V nominal) supplies. The ANDed OE1/OE2 enable logic allows flexible control from either ECL or TTL source domains without level-shifting circuitry.

Its 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 power/ground pins (VCC on pin 15, GND on pins 16–18, VEE on pin 19) reduce simultaneous switching noise in dense PCB layouts.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - supports standard TTL supply tolerance and ensures stable output voltage compliance.
VEE Range	−4.94 V to −5.46 V - matches 10KH ECL system bias requirements and enables direct connection to ECL logic rails.
tPLH / tPHL	1.6 ns (min) to 6.4 ns (max) - guarantees sub-7 ns propagation delay for high-speed bus timing budgets.
IOL / IOH	48 mA sink / −15 mA source - drives standard TTL loads without external buffers in memory or clock distribution paths.
VIH/VIL (TTL)	2.0 V / 0.8 V - meets standard TTL input thresholds for reliable interfacing with legacy TTL controllers.
VIH/VIL (ECL)	−810 mV / −1480 mV (at 25°C) - aligns with 10KH ECL logic thresholds for noise-immune signal reception.
Operating Temp	0°C to 75°C - qualified for commercial-grade industrial computing and datacom equipment environments.

Pinout & Package

DW package: SOIC-24 (Small Outline Integrated Circuit, 300-mil width), surface-mount, 24-pin, gull-wing leads. Pin 1 index located at top-left corner (top view).

Pin/Terminal	Circuit Role	Design Meaning
1–8, 21–24	Data inputs A1–A8	ECL-compatible inputs accepting −1950 mV to −735 mV logic levels; directly driven by 10KH ECL sources.
9, 10	Output enables OE1 (ECL), OE2 (TTL)	AND-gated enable control: OE1 accepts ECL logic; OE2 accepts TTL logic-no external level shifters required.
11–14, 17–20	Inverting TTL outputs Y1–Y8	Active-low TTL outputs with 0.38 V VOL (48 mA) and 2.4 V VOH (−15 mA); compatible with 74LS/74F loads.
15	VCC	+5 V TTL supply rail; center-positioned to minimize power delivery inductance and decoupling complexity.
16–18	GND	Three dedicated ground pins reduce ground bounce and improve signal integrity in high-speed switching.
19	VEE	−5.2 V ECL supply rail; center-positioned adjacent to GND for optimal ECL domain noise rejection.

Key Features

Feature	Design Value
Flow-through architecture	Input-to-output signal path spans opposite sides of package (pins 1–12/21–24 → 11–14/17–20), enabling straight PCB routing and reducing stub reflections.
Dual-domain enable logic	OE1 (ECL) and OE2 (TTL) inputs are internally ANDed-supports seamless integration into hybrid ECL/TTL control planes without glue logic.
Center-pin power/ground layout	VCC (pin 15), three GND (pins 16–18), and VEE (pin 19) clustered centrally-lowers simultaneous switching noise and improves PSRR above 100 MHz.
10KH ECL compatibility	Fully compliant with TI's 10KH ECL family timing, voltage thresholds, and loading specifications-guarantees interoperability in legacy ECL systems.
Inverting output polarity	Outputs Y1–Y8 invert input logic states-enables direct replacement in existing inverting bus driver designs without logic inversion elsewhere.

Applications

Memory Address Drivers	Clock Distribution Networks
Use Scenario: Driving address lines from ECL-based CPU cores to TTL-compatible memory arrays in vintage minicomputers or embedded controllers. IC Role / Device Role / Timing Role: Level-translating octal buffer with inverting outputs, providing fanout and voltage-domain isolation between CPU and memory subsystems. Use Value: Eliminates need for discrete resistor-transistor level shifters; maintains <6.4 ns propagation delay across all eight channels for synchronous address setup.	Use Scenario: Distributing system clocks from ECL clock generators to TTL-synchronized peripherals such as UARTs, timers, and I/O expanders. IC Role / Device Role / Timing Role: High-fanout, low-skew clock buffer translating ECL clock edges into TTL-compatible waveforms with controlled rise/fall times. Use Value: Delivers 48 mA sink current per output to drive multiple TTL loads while maintaining <7 ns enable/disable timing (tPZL/tPHZ) for precise clock gating.
Bus-Oriented Receivers	Backplane Data Transceivers
Use Scenario: Receiving parallel data from ECL backplane buses and presenting clean TTL signals to local bus controllers or FPGA I/O banks. IC Role / Device Role / Timing Role: Input-side translator with ECL-compatible VIH/VIL thresholds and TTL output drive strength, placed at bus termination points. Use Value: Supports −1480 mV ECL low-level input at 75°C, ensuring robust noise margin in electrically noisy backplane environments.	Use Scenario: Bidirectional data interface between ECL-based processor modules and TTL-based peripheral cards in modular instrumentation chassis. IC Role / Device Role / Timing Role: Octal unidirectional translator used in receive direction only, paired with complementary TTL-to-ECL devices on transmit path. Use Value: Flow-through pinout allows orthogonal PCB layout with matched-length traces, minimizing inter-channel skew below 100 ps across all eight lanes.

Memory Address Drivers

Clock Distribution Networks

Use Scenario: Driving address lines from ECL-based CPU cores to TTL-compatible memory arrays in vintage minicomputers or embedded controllers.

IC Role / Device Role / Timing Role: Level-translating octal buffer with inverting outputs, providing fanout and voltage-domain isolation between CPU and memory subsystems.

Use Value: Eliminates need for discrete resistor-transistor level shifters; maintains <6.4 ns propagation delay across all eight channels for synchronous address setup.

Use Scenario: Distributing system clocks from ECL clock generators to TTL-synchronized peripherals such as UARTs, timers, and I/O expanders.

IC Role / Device Role / Timing Role: High-fanout, low-skew clock buffer translating ECL clock edges into TTL-compatible waveforms with controlled rise/fall times.

Use Value: Delivers 48 mA sink current per output to drive multiple TTL loads while maintaining <7 ns enable/disable timing (tPZL/tPHZ) for precise clock gating.

Bus-Oriented Receivers

Backplane Data Transceivers

Use Scenario: Receiving parallel data from ECL backplane buses and presenting clean TTL signals to local bus controllers or FPGA I/O banks.

IC Role / Device Role / Timing Role: Input-side translator with ECL-compatible VIH/VIL thresholds and TTL output drive strength, placed at bus termination points.

Use Value: Supports −1480 mV ECL low-level input at 75°C, ensuring robust noise margin in electrically noisy backplane environments.

Use Scenario: Bidirectional data interface between ECL-based processor modules and TTL-based peripheral cards in modular instrumentation chassis.

IC Role / Device Role / Timing Role: Octal unidirectional translator used in receive direction only, paired with complementary TTL-to-ECL devices on transmit path.

Use Value: Flow-through pinout allows orthogonal PCB layout with matched-length traces, minimizing inter-channel skew below 100 ps across all eight lanes.

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
SN10KHT5540N	Same logic function and electrical specs, but in 300-mil plastic DIP-24 package instead of SOIC-24 (DW).	Preferred for through-hole prototyping or legacy board rework where surface-mount assembly is unavailable.	Select SN10KHT5540N when manual soldering, socketing, or compatibility with older DIP-based test fixtures is required.
MC100ELT24DG	ECL-to-TTL translator with identical 8-bit inverting function but uses ECL PECL supply (VCC = 5 V, VEE = 0 V), not negative VEE.	Suitable for newer PECL-based systems; requires different power sequencing and lacks native 10KH ECL compatibility.	Choose MC100ELT24DG only if migrating from 10KH to PECL infrastructure and redesigning power delivery for VEE = 0 V operation.

Compared with SN10KHT5540N and MC100ELT24DG, the SN10KHT5540DW uniquely combines 10KH ECL compatibility, negative-VEE operation, and SOIC-24 packaging-making it the sole option for space-constrained, legacy ECL system upgrades requiring drop-in replacement without power rail changes.

Availability

SN10KHT5540DW is available at Aetrix Electronics and suitable for memory-address buffering, clock distribution networks, bus-oriented receivers, and backplane data transceivers requiring stable component supply across extended product lifecycles.

Supply support for SN10KHT5540DW 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 SN10KHT5540DW belongs to TI's 10KH ECL translator product line, engineered specifically to bridge legacy ECL CPU/bus architectures with TTL peripheral subsystems in high-reliability computing and instrumentation systems.

FAQ

What is the operating temperature range for the SN10KHT5540DW?

The SN10KHT5540DW is characterized for operation from 0°C to 75°C. This commercial-grade temperature specification aligns with its intended use in industrial computing, datacom equipment, and instrumentation systems where ambient conditions remain within this range. The device's electrical parameters-including propagation delay, output drive, and input thresholds-are guaranteed across this full interval per the SDZS006 datasheet.

Does the SN10KHT5540DW support both ECL and TTL control inputs simultaneously?

Yes, the SN10KHT5540DW supports simultaneous ECL and TTL control via two independent output-enable inputs: OE1 is ECL-compatible (accepting −1950 mV to −735 mV logic levels), and OE2 is TTL-compatible (accepting 0.8 V to 2.0 V). These are internally ANDed, allowing the SN10KHT5540DW outputs to be enabled only when both signals are asserted-enabling flexible control from mixed-signal system domains without external logic.

What is the maximum output sink current per channel for the SN10KHT5540DW?

The SN10KHT5540DW provides a guaranteed minimum low-level output current (IOL) of 48 mA per channel under recommended operating conditions (VCC = 4.5 V, VEE = −5.2 V ± 5%, TA = 25°C). This enables direct driving of multiple standard TTL loads (e.g., 74LS series) without external buffers, supporting fanout requirements in memory address and bus driver applications.

Is the SN10KHT5540DW pin-compatible with other members of the SN10KHT5540 family?

Yes, the SN10KHT5540DW shares identical pinout and functionality with the SN10KHT5540N (DIP-24) variant. Both devices use the same 24-pin assignment for inputs, outputs, enables, and power terminals. This allows direct PCB footprint substitution between SOIC and DIP packages-critical for design reuse, prototyping flexibility, and long-term obsolescence mitigation across the SN10KHT5540 family.

What are the absolute maximum supply voltage ratings for the SN10KHT5540DW?

The SN10KHT5540DW has absolute maximum supply ratings of VCC = −0.5 V to 7 V and VEE = −8 V to 0 V. Exceeding these limits-even momentarily-may cause permanent damage. For reliable operation, VCC must be maintained between 4.5 V and 5.5 V, and VEE between −4.94 V and −5.46 V, as specified in the recommended operating conditions table of the SDZS006 datasheet.

SN10KHT5540DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:

Packaging:: Bulk

Product Status:: Active

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Voltage - VCCA:: -

Voltage - VCCB:: -

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SN10KHT5540DW FAQ

1.How can I place an order for SN10KHT5540DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN10KHT5540DW 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 SN10KHT5540DW reliable?

The price and inventory of SN10KHT5540DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN10KHT5540DW is usually 5 days.

3.What payment methods are accepted for SN10KHT5540DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN10KHT5540DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN10KHT5540DW?

SN10KHT5540DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN10KHT5540DW 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 SN10KHT5540DW?

For technical support, including SN10KHT5540DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN10KHT5540DW requirements.

6.How does Aetrix verify that SN10KHT5540DW is sourced from the original manufacturer or authorized distributors?

All SN10KHT5540DW 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 SN10KHT5540DW meets industry standards.

7.What is the process for return or replacement of SN10KHT5540DW?

All SN10KHT5540DW units undergo pre-shipment inspection (PSI). If there is an issue with SN10KHT5540DW, 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 SN10KHT5540DW part is unused and in its original packaging.

Return procedure for SN10KHT5540DW:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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