Texas Instruments SN10KHT5543DWR

Overview

SN10KHT5543DWR 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 ECL 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 SN10KHT5543DWR datasheet, SN10KHT5543DWR pinout, SN10KHT5543DWR application, or SN10KHT5543DWR equivalent, key selection considerations include ECL-compatible output swing (−1.29 V to −1.99 V), TTL input threshold compatibility (V_IL = 0.8 V max, V_IH = 2.0 V min), output enable timing control, and SOIC-24 package thermal and layout constraints.

Technical Context

This device implements TTL-input logic sensing with differential ECL output stages, using internal current-switching topology to achieve sub-4 ns propagation delay. Each channel includes independent output enable control via a shared active-low OE pin, allowing dynamic bus isolation without external gating.

It requires dual supplies: V_CC = +5 V for TTL input interface and V_EE = −5.2 V for ECL output stage biasing. The output stage delivers true and complementary ECL signals (Y and Y̅) per channel, supporting wired-OR termination and standard ECL-100K load conditions.

Key Specifications

Pinout & Package

SN10KHT5543DWR is housed in a 24-pin SOIC (DW) package with standard JEDEC MS-013AC dimensions (7.5 mm width, 1.75 mm height, 1.27 mm pitch). Pin assignments follow TI's octal translator layout with dedicated input, output, and control terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN10KHT5542DWR and MC100ELT24DTG, SN10KHT5543DWR uniquely combines octal translation, active-low OE control, full differential ECL outputs (Y/Y̅), and −5.2 V V_EE compatibility-making it the only option among the three that supports legacy ECL-100K bus arbitration with dynamic enable/disable sequencing.

Availability

SN10KHT5543DWR is available at Aetrix Electronics and suitable for high-speed backplane interfacing, legacy system emulation, and digital instrumentation bus applications requiring stable component supply and long-term industrial availability.

Supply support for SN10KHT5543DWR 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 devices with broad industrial and aerospace heritage.

The SN10KHT5543DWR belongs to TI's 10KH series of high-speed ECL interface components, developed in the late 1980s to bridge TTL-based control logic with ECL-based high-performance computing subsystems.

FAQ

What is the recommended power supply configuration for SN10KHT5543DWR?

SN10KHT5543DWR requires two separate supplies: V_CC = +5 V for TTL input stage biasing and V_EE = −5.2 V for ECL output stage operation. Decoupling capacitors (0.1 µF ceramic + 10 µF tantalum) must be placed near pins 12 (V_CC) and 24 (V_EE). The SN10KHT5543DWR does not support single-supply operation or alternate voltage combinations outside these specifications.

Does SN10KHT5543DWR support hot insertion or live bus connection?

No, SN10KHT5543DWR is not rated for hot insertion. Its ECL outputs lack built-in current limiting or fault protection, and applying V_EE before V_CC may cause latch-up. The SN10KHT5543DWR must be powered in strict sequence: V_CC first, then V_EE, with OE held high until both rails stabilize. Board-level protection circuitry is required for live-connect scenarios.

What is the function of the complementary outputs (Y̅1–Y̅8) on SN10KHT5543DWR?

The complementary outputs (Y̅1–Y̅8) on SN10KHT5543DWR provide true differential signaling pairs alongside Y1–Y8, enabling wired-OR logic implementation, improved noise immunity, and compatibility with ECL-100K receivers that require both true and complement inputs. These outputs are not inverted versions for logic inversion-they are actively driven complementary signals referenced to the same V_EE.

Can SN10KHT5543DWR be used with modern 3.3 V TTL logic families?

SN10KHT5543DWR is specified for standard 5 V TTL input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) and is not guaranteed to correctly interpret 3.3 V logic highs. While some 3.3 V outputs may exceed 2.0 V under light load, marginal operation can occur. For reliable 3.3 V interface, SN10KHT5543DWR requires a level-shifting buffer stage or selection of a newer translator like MC100ELT24DTG.

Is SN10KHT5543DWR RoHS compliant?

Yes, SN10KHT5543DWR is RoHS compliant and classified as "Green (RoHS & no Sb/Br)" per TI's 2017 packaging addendum. It uses CU NIPDAU lead finish and meets JEDEC MSL Level-1 moisture sensitivity rating. The SN10KHT5543DWR has no lead, bromine, or antimony exceeding 0.1% by weight in homogeneous materials, satisfying EU Directive 2011/65/EU requirements.