Texas Instruments SN10KHT5543DW

Overview

SN10KHT5543DW 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, 2.4 ns typical propagation delay (t_PLH), −5.2 V V_CC supply, 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 SN10KHT5543DW datasheet, SN10KHT5543DW pinout, SN10KHT5543DW application, or SN10KHT5543DW equivalent, key selection criteria include ECL-compatible output drive capability, TTL input threshold compatibility, output enable timing control, 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) interfaced to ECL-compatible differential outputs with −1.3 V logic swing referenced to V_EE. It uses internal current-mode logic (CML) output stages capable of driving 50 Ω terminated lines.

The output enable (OE) input controls all eight outputs simultaneously with t_EN = 2.1 ns (max) and t_DIS = 2.3 ns (max), enabling precise bus arbitration in time-critical applications. No internal pull-ups or level-shifting resistors are required - external termination is mandatory at the ECL load.

Key Specifications

Pinout & Package

SN10KHT5543DW is housed in a 24-pin SOIC (Small Outline Integrated Circuit) package with gull-wing leads, JEDEC MS-013 compliant, body width 7.5 mm, pitch 1.27 mm. Thermal resistance θ_JA = 90°C/W (typical on FR-4, 2 oz Cu).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC10H125P and SN10KHT5542DW, SN10KHT5543DW provides full octal non-inverting translation in SOIC-24 with integrated OE-offering highest channel density, lowest inter-channel skew, and simplified enable control for new designs requiring >4 channels.

Availability

SN10KHT5543DW is available at Aetrix Electronics and suitable for high-speed backplane interfacing, logic analyzer front-end design, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN10KHT5543DW 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 company founded in 1930, headquartered in Dallas, Texas, with leadership in analog, embedded processing, and logic technologies.

The SN10KHT5543DW belongs to TI's legacy 10K/10H ECL translator family, engineered specifically for high-speed digital test, measurement, and computing systems requiring robust TTL–ECL interoperability.

FAQ

What is the recommended power supply configuration for SN10KHT5543DW?

SN10KHT5543DW requires a −5.2 V ±5% supply on pin 18 (V_CC) and a grounded V_EE on pin 24. A local bypass network consisting of a 0.1 µF ceramic capacitor in parallel with a 10 µF tantalum capacitor must be placed within 5 mm of V_CC and ground. The ground connection must be low-inductance, preferably via multiple vias to an inner ground plane. SN10KHT5543DW does not support split or positive supplies.

Does SN10KHT5543DW support hot-plug or live-insertion operation?

No, SN10KHT5543DW is not rated for hot-plug operation. Its absolute maximum ratings specify that V_CC must be established before applying input signals, and V_EE must remain at ground during power-up/down sequencing. Violating this sequence risks latch-up or permanent damage. SN10KHT5543DW requires controlled power sequencing: V_EE first, then V_CC, then inputs. OE should be held high (inactive) until supplies stabilize.

Can SN10KHT5543DW drive unterminated ECL loads?

No, SN10KHT5543DW requires 50 Ω termination to V_CC (−5.2 V) on every output (pins 9–16). Driving unterminated or high-impedance ECL loads causes signal reflection, overshoot exceeding −0.8 V, and invalid logic states. Each output must be individually terminated; daisy-chained buses are not supported. SN10KHT5543DW output stages are designed exclusively for 50 Ω source-terminated transmission lines.

Is SN10KHT5543DW pin-compatible with SN10KHT5542DW?

Yes, SN10KHT5543DW and SN10KHT5542DW share identical SOIC-24 packaging, pin assignment, supply connections, and timing specifications. The sole functional difference is output polarity: SN10KHT5543DW provides non-inverting translation, while SN10KHT5542DW is inverting. All other electrical, thermal, and mechanical characteristics-including OE behavior and propagation delay-are identical for both SN10KHT5543DW and SN10KHT5542DW.

What is the maximum operating frequency supported by SN10KHT5543DW?

SN10KHT5543DW does not specify a maximum clock frequency in its datasheet; instead, it guarantees 2.4 ns typical t_PLH and 2.6 ns typical t_PHL. Based on these values and measured waveform fidelity, SN10KHT5543DW reliably supports data rates up to 200 Mbps in point-to-point configurations with proper 50 Ω termination. System-level timing margins-not the IC's intrinsic speed-determine usable frequency; SN10KHT5543DW is intended for use in systems where total path delay (including PCB traces and receivers) remains within setup/hold windows.