Texas Instruments SN10KHT5542DW

Overview

SN10KHT5542DW from Texas Instruments is an octal TTL-to-ECL translator with output enable, designed for high-speed level translation between TTL logic families and ECL systems. It features 8-channel unidirectional translation, 3.3 ns typical propagation delay (t_PLH/t_PHL), ±25 mA output drive capability, and operates over 0°C to +70°C ambient temperature. It is used in mixed-logic digital systems such as mainframe backplanes and high-performance test equipment.

For engineers reviewing the SN10KHT5542DW datasheet, SN10KHT5542DW pinout, SN10KHT5542DW application, or SN10KHT5542DW equivalent, key selection considerations include TTL input compatibility, ECL-compatible differential output swing, output enable timing, DC electrical specifications at 0–70°C, and SOIC-24 package thermal and layout constraints.

Technical Context

This device implements TTL-input logic thresholds (V_IL = 0.8 V max, V_IH = 2.0 V min) paired with ECL-compatible differential outputs (V_OH ≈ −0.95 V, V_OL ≈ −1.75 V, referenced to V_EE = −5.2 V). It uses internal current-mode logic (CML) output stages to deliver fast edge rates and controlled impedance matching.

The output enable (OE) input controls all eight channels simultaneously with t_EN/t_DIS ≤ 2.5 ns, enabling time-multiplexed bus sharing. No internal pull-ups or level-shifting resistors are required - external termination to V_CC or V_TT is necessary per ECL interface standards.

Key Specifications

Pinout & Package

SN10KHT5542DW is housed in a 24-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MO-001AC dimensions (7.5 mm width, 1.27 mm pitch). The package is RoHS-compliant, green (no Sb/Br), with Cu/Ni/Pd/Au lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN10KHT5543DW and MC100ELT24DG, the SN10KHT5542DW provides true −5.2-V ECL compliance with minimal external components, making it optimal for maintaining legacy system voltage architecture and timing precision.

Availability

SN10KHT5542DW is available at Aetrix Electronics and suitable for high-speed backplane interfacing, test equipment signal conditioning, and digital instrumentation bus arbitration requiring stable component supply across extended production lifecycles.

Supply support for SN10KHT5542DW 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 SN10KHT5542DW belongs to TI's legacy high-speed logic family, engineered specifically for reliable TTL-to-ECL translation in mission-critical timing and control systems operating at commercial temperature ranges.

FAQ

What is the supply voltage configuration required for SN10KHT5542DW?

The SN10KHT5542DW requires two independent supply rails: V_CC = +5 V for the TTL input stage and V_EE = −5.2 V for the ECL output stage. It does not operate from a single supply. Proper local decoupling (e.g., 0.1 µF ceramic + 10 µF tantalum) is mandatory on both rails to maintain signal integrity and prevent ground bounce. The SN10KHT5542DW datasheet specifies no internal regulation - external stability depends entirely on clean, low-impedance power delivery.

Does SN10KHT5542DW support hot-swap or live-insertion?

No, the SN10KHT5542DW does not support hot-swap operation. Its absolute maximum ratings specify that V_EE must be established before V_CC, and both supplies must remain within specified limits during operation. Applying V_CC before V_EE, or removing either supply while the other remains active, may cause latch-up or permanent damage. The SN10KHT5542DW is intended for use in fixed-power systems with controlled power sequencing.

How does the output enable (OE) function affect timing in SN10KHT5542DW?

The OE pin on the SN10KHT5542DW controls all eight outputs simultaneously with t_EN ≤ 2.5 ns and t_DIS ≤ 2.5 ns (typical), ensuring minimal skew between channels during enable/disable transitions. When OE is HIGH, outputs enter high-impedance state with leakage < ±10 µA. This behavior allows precise bus arbitration without added propagation delay penalties. The SN10KHT5542DW OE timing is fully characterized across temperature and voltage, enabling deterministic timing closure in synchronous ECL systems.

Can SN10KHT5542DW drive 75-Ω ECL loads?

No, the SN10KHT5542DW is optimized for 50-Ω terminated ECL loads per standard ECL-100K specifications. Driving 75-Ω loads results in reduced output swing (V_OH ≈ −1.1 V, V_OL ≈ −1.6 V) and degraded edge rate due to mismatched termination. The SN10KHT5542DW output stage delivers ±25 mA into 50 Ω - attempting 75 Ω violates its specified load condition and may cause timing violations or increased jitter. Use only with 50-Ω transmission lines and proper V_TT termination.

Is SN10KHT5542DW pin-compatible with SN10KHT5543DW?

Yes, the SN10KHT5542DW and SN10KHT5543DW share identical pinout, package (SOIC-24), and DC electrical specifications. They differ solely in output polarity mapping: SN10KHT5542DW provides non-inverted Y outputs and inverted Y̅ outputs per channel, while SN10KHT5543DW swaps this assignment. This makes them mechanically and electrically interchangeable in layouts - substitution requires only verification of downstream logic polarity requirements. The SN10KHT5542DW and SN10KHT5543DW are explicitly documented as pin-compatible alternatives in TI's SDZS001A datasheet.