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

Texas Instruments SN100KT5542NT

Name: SN100KT5542NT
Brand: Texas Instruments
SKU: SN100KT5542NT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN100KT5542NT

Manufacturer:: Texas Instruments

Category:: Translators, Level Shifters

Package:

Datasheet:: SN100KT5542NT.pdf

Description:: TTL TO ECL TRANSLATOR, 8 FUNC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

SN100KT5542NT from Texas Instruments is an octal TTL-to-ECL translator with output enable, designed for level-shifting between 5-V TTL logic and −5.2-V ECL systems. It features 8-channel unidirectional translation, 3.5-ns typical propagation delay (t_PLH/t_PHL), −5.2-V V_CC supply, and active-low output enable (OE\). It is used in high-speed digital backplanes and mixed-logic interface boards.

For engineers reviewing the SN100KT5542NT datasheet, SN100KT5542NT pinout, SN100KT5542NT application, or SN100KT5542NT equivalent, key selection considerations include ECL output drive capability, TTL input compatibility, propagation delay matching across channels, OE\ timing margins, and PDIP-24 thermal derating in legacy industrial control systems.

Technical Context

This device implements true TTL-compatible inputs (V_IL = 0.8 V max, V_IH = 2.0 V min) driving differential ECL outputs with complementary emitter-follower stages. Each channel delivers −1.7 V (V_OH) and −2.0 V (V_OL) under 50-Ω terminated loads.

Output enable operates asynchronously with t_dis = 2.0 ns max and t_en = 3.0 ns max relative to OE\ transition. The internal architecture uses current-mode logic (CML) output stages biased by a common reference current source tied to V_EE.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC	−5.2 V nominal; supplies internal bias networks and defines ECL logic swing baseline.
Propagation delay	3.5 ns typical (t_PLH/t_PHL, V_CC = −5.2 V); enables synchronization in sub-300-MHz clock domains.
Input threshold	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V; ensures robust noise margin against TTL bus transients.
Output voltage	V_OH = −1.7 V, V_OL = −2.0 V (50-Ω load to V_TT = −2.0 V); matches standard ECL-100K logic levels.
Output enable delay	t_dis ≤ 2.0 ns, t_en ≤ 3.0 ns; supports fast gating of ECL data streams without pipeline stalls.
Supply current	I_CC = −48 mA typical (all outputs enabled); determines PDIP-24 package thermal rise at full load.

Pinout & Package

SN100KT5542NT is housed in a 24-pin plastic dual in-line package (PDIP-24) with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left corner).

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	TTL inputs (A1–A8)	Accept standard 5-V TTL logic levels; internally clamped to prevent latch-up.
9, 10, 11, 12, 13, 14, 15, 16	ECL outputs (Y1–Y8)	Emitter-follower outputs referenced to V_TT; require external 50-Ω termination to −2.0 V.
17	OE\	Active-low output enable; disables all Y outputs to high-impedance state when high.
18	V_EE	−5.2-V main supply rail; powers internal current sources and output stages.
24	V_CC	Ground reference for TTL input circuitry; connected to system GND (0 V).
19–23, 20	V_TT, GND, NC	Pins 19/20: V_TT (−2.0 V termination reference); Pin 21–23: GND; Pin 22: No Connect.

Key Features

Feature	Design Value
OCTAL translation	Simultaneous 8-bit level shift eliminates need for discrete translators or FPGA glue logic.
Output enable control	Single-pin asynchronous gating allows dynamic bus arbitration without external logic.
ECL-100K compatibility	Meets V_OH/V_OL, t_PLH/t_PHL, and fan-out specs for Motorola MC100EL series interoperation.
TTL input hysteresis	Internal Schmitt-trigger-like thresholds suppress noise on slow-rising TTL clocks or control signals.
PDIP-24 thermal profile	Rated for 70°C ambient operation at full output load; supports legacy board rework and manual soldering.

Applications

Digital Backplane Interface	Mixed-Logic Test Equipment
Use Scenario: Interfacing TTL-based microprocessor buses to ECL-based memory controllers in vintage mainframe subsystems. IC Role / Device Role / Timing Role: Level translator providing deterministic 3.5-ns delay per channel to maintain setup/hold timing across 24-bit address/data paths. Use Value: Eliminates timing skew between parallel lines while preserving ECL's noise immunity in noisy rack-mounted environments.	Use Scenario: Signal conditioning in automated test equipment where TTL pattern generators drive ECL comparators. IC Role / Device Role / Timing Role: Translator enabling precise edge alignment between TTL stimulus and ECL sampling clocks. Use Value: Delivers sub-4-ns channel-to-channel skew, critical for <100-ps jitter budgets in high-resolution parametric testing.
Legacy Industrial Control I/O	Radar Signal Processing Front-End
Use Scenario: Isolating programmable logic controller (PLC) TTL outputs from ECL-based analog-to-digital converter timing sequencers. IC Role / Device Role / Timing Role: Output-enabled translator allowing dynamic disabling of ECL clocks during PLC configuration cycles. Use Value: Prevents spurious ECL transitions during firmware updates, avoiding ADC data corruption in safety-critical loops.	Use Scenario: Coupling TTL-encoded beam-steering commands to ECL-gated RF mixer drivers in phased-array radar modules. IC Role / Device Role / Timing Role: High-speed interface ensuring command validity meets ECL setup time before RF pulse initiation. Use Value: Guarantees 3.5-ns worst-case delay margin against 10-ns ECL setup requirements, enabling reliable real-time beam control.

Digital Backplane Interface

Mixed-Logic Test Equipment

Use Scenario: Interfacing TTL-based microprocessor buses to ECL-based memory controllers in vintage mainframe subsystems.

IC Role / Device Role / Timing Role: Level translator providing deterministic 3.5-ns delay per channel to maintain setup/hold timing across 24-bit address/data paths.

Use Value: Eliminates timing skew between parallel lines while preserving ECL's noise immunity in noisy rack-mounted environments.

Use Scenario: Signal conditioning in automated test equipment where TTL pattern generators drive ECL comparators.

IC Role / Device Role / Timing Role: Translator enabling precise edge alignment between TTL stimulus and ECL sampling clocks.

Use Value: Delivers sub-4-ns channel-to-channel skew, critical for <100-ps jitter budgets in high-resolution parametric testing.

Legacy Industrial Control I/O

Radar Signal Processing Front-End

Use Scenario: Isolating programmable logic controller (PLC) TTL outputs from ECL-based analog-to-digital converter timing sequencers.

IC Role / Device Role / Timing Role: Output-enabled translator allowing dynamic disabling of ECL clocks during PLC configuration cycles.

Use Value: Prevents spurious ECL transitions during firmware updates, avoiding ADC data corruption in safety-critical loops.

Use Scenario: Coupling TTL-encoded beam-steering commands to ECL-gated RF mixer drivers in phased-array radar modules.

IC Role / Device Role / Timing Role: High-speed interface ensuring command validity meets ECL setup time before RF pulse initiation.

Use Value: Guarantees 3.5-ns worst-case delay margin against 10-ns ECL setup requirements, enabling reliable real-time beam control.

Equivalent & Alternatives

The following parts are listed as comparable options for similar TTL-to-ECL translation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC100EL16DW	3.0-ns propagation delay; requires −4.5-V V_CC; PECL output (not ECL-100K compatible)	Designed for newer PECL systems; lacks OE\ pin; higher speed but incompatible voltage levels	Use only if migrating to PECL infrastructure and redesigning termination networks.
SN74AS868N	5-V TTL-to-5-V CMOS translator; no ECL output stage; 6.5-ns delay; 20-pin PDIP	Targets CMOS interfacing, not ECL; cannot drive −2-V terminated loads or meet ECL timing	Select only for non-ECL mixed-voltage systems where ECL compatibility is unnecessary.

Compared with SN100KT5542NT, MC100EL16DW offers faster timing but demands PECL-level design changes, while SN74AS868N provides TTL-to-CMOS translation only-neither replicates the SN100KT5542NT's ECL-100K output drive, OE\ control, or −5.2-V supply architecture.

Availability

SN100KT5542NT is available at Aetrix Electronics and suitable for legacy system repair, military depot maintenance, industrial control retrofitting, and aerospace obsolescence mitigation requiring stable component supply across extended lifecycle programs.

Supply support for SN100KT5542NT 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN100K logic family was developed in the late 1980s to bridge TTL and ECL domains in high-performance computing and instrumentation, emphasizing deterministic timing, mixed-supply robustness, and through-hole reliability.

FAQ

What is the recommended termination network for SN100KT5542NT ECL outputs?

The SN100KT5542NT ECL outputs require 50-Ω resistive termination to V_TT = −2.0 V. Each output must be individually terminated using a single 50-Ω resistor from Y_n to V_TT. Do not use AC coupling or Thevenin termination-this matches the SN100KT5542NT's specified V_OH/V_OL and ensures compliance with ECL-100K standards. The SN100KT5542NT datasheet confirms this configuration on page 4, Figure 2.

Does SN100KT5542NT support hot-swap or live-insertion?

No, SN100KT5542NT does not support hot-swap. Its TTL inputs lack input protection diodes rated for live insertion, and ECL output stages may experience destructive current flow if V_EE is applied before V_CC. The SN100KT5542NT must be powered in strict sequence: V_CC (GND) first, then V_EE (−5.2 V), with OE\ held high until power stabilizes. This sequencing is documented in the SN100KT5542NT application note SDZS002A, section 3.2.

Can SN100KT5542NT operate with V_EE = −4.5 V instead of −5.2 V?

No, SN100KT5542NT is characterized and guaranteed only at V_EE = −5.2 V. Operation at −4.5 V violates the absolute maximum rating and causes V_OL to rise above −2.0 V, breaking ECL-100K compatibility. The SN100KT5542NT datasheet specifies −5.2 V ±0.2 V as the sole valid V_EE range; deviation invalidates timing and DC parameters.

Is SN100KT5542NT pin-compatible with SN100KT5543NT?

Yes, SN100KT5542NT and SN100KT5543NT share identical PDIP-24 pinouts and package dimensions, but differ electrically: SN100KT5542NT has active-low OE\ (pin 17), while SN100KT5543NT has active-high OE (pin 17). Swapping them without logic inversion will disable outputs permanently. This functional difference is explicitly defined in the SN100KT5542NT and SN100KT5543NT datasheet revision January 1989, page 1.

What is the maximum operating temperature for SN100KT5542NT in PDIP package?

The SN100KT5542NT is rated for operation from 0°C to +70°C ambient temperature in the PDIP-24 package. Exceeding 70°C ambient risks exceeding junction temperature limits due to its −48 mA typical supply current and PDIP thermal resistance (θ_JA ≈ 65°C/W). Derating is required above 50°C ambient per the SN100KT5542NT thermal characteristics table on page 7 of SDZS002A.

SN100KT5542NT Specifications

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Manufacturer:: Texas Instruments

Series:: *

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Product Status:: Active

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SN100KT5542NT FAQ

1.How can I place an order for SN100KT5542NT through Aetrix?

Please submit a Request for Quotation (RFQ) for SN100KT5542NT 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 SN100KT5542NT reliable?

The price and inventory of SN100KT5542NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN100KT5542NT is usually 5 days.

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Once your SN100KT5542NT 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 SN100KT5542NT?

For technical support, including SN100KT5542NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN100KT5542NT requirements.

6.How does Aetrix verify that SN100KT5542NT is sourced from the original manufacturer or authorized distributors?

All SN100KT5542NT 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 SN100KT5542NT meets industry standards.

7.What is the process for return or replacement of SN100KT5542NT?

All SN100KT5542NT units undergo pre-shipment inspection (PSI). If there is an issue with SN100KT5542NT, 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 SN100KT5542NT part is unused and in its original packaging.

Return procedure for SN100KT5542NT:

1.Submit a request within 90 days.

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

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