Texas Instruments SN10KHT5578DW

Overview

SN10KHT5578DW from Texas Instruments is an octal TTL-to-ECL translator with eight edge-triggered D-type flip-flops, noninverting ECL outputs, and independent output enable (OE) control. It operates across 0°C to 75°C with VCC = 4.5–5.5 V and VEE = –4.94 to –5.46 V, delivering 180 MHz clock frequency support and sub-3 ns propagation delays (tPLH/tPHL ≤ 2.2/2.1 ns). It is used in high-speed CPU/bus systems for memory address drivers and clock distribution.

For engineers reviewing the SN10KHT5578DW datasheet, SN10KHT5578DW pinout, SN10KHT5578DW application, or SN10KHT5578DW equivalent, key selection criteria include its 10KH ECL compatibility, flow-through PCB layout architecture, center-pin VCC/VEE/GND configuration for noise suppression, and dual-voltage interface capability between TTL logic domains and ECL signal environments.

Technical Context

This device implements eight synchronous D-type flip-flops triggered on the positive edge of a TTL-compatible clock input, with each Q output reflecting the corresponding D input state at clock transition. The OE input operates independently of internal flip-flop operation, allowing data retention or update while outputs are disabled.

It features separate TTL-level inputs (CLK, D_1–8) and ECL-level outputs (Q_1–8), with ECL logic levels referenced to VEE (–5.2 V nominal). Input voltage ranges are –1.2 V to 7 V (TTL) and VEE to 0 V (ECL); output termination uses 50 Ω to –2 V per JEDEC-compliant test conditions.

Key Specifications

Pinout & Package

The SN10KHT5578DW is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), with center-aligned power pins (VCC at Pin 17, VEE at Pin 24, GND at Pins 5–8) to minimize switching noise and optimize high-speed layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN10KHT5578NT and MC100EL16DW, the SN10KHT5578DW uniquely integrates octal D-flip-flops, flow-through layout, and optimized SOIC thermal performance - making it the only choice for space-constrained, high-density, synchronous TTL/ECL interface applications requiring on-chip storage and minimal PCB routing complexity.

Availability

SN10KHT5578DW is available at Aetrix Electronics and suitable for high-speed computing, telecom infrastructure, and industrial control systems requiring stable component supply and long-term manufacturability.

Supply support for SN10KHT5578DW 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 specializing in analog, embedded processing, and logic technologies, with over 90 years of innovation in high-performance electronic components.

The SN10KHT5578DW belongs to TI's 10KH ECL logic family, designed specifically to bridge TTL and ECL domains in CPU/bus-oriented systems such as memory controllers, clock trees, and high-speed data paths where timing integrity and noise immunity are critical.

FAQ

What is the operating temperature range for the SN10KHT5578DW?

The SN10KHT5578DW is characterized for operation from 0°C to 75°C ambient temperature. This commercial-grade specification aligns with typical requirements for industrial computing and telecom equipment where airflow and thermal management are controlled. The device's electrical characteristics - including propagation delay, output voltage levels, and current consumption - are guaranteed across this full range per the SDZS014A datasheet revision.

Does the SN10KHT5578DW require external pull-up or pull-down resistors on its inputs or outputs?

No, the SN10KHT5578DW does not require external pull-up or pull-down resistors. Its TTL inputs (CLK, D_1–8) have defined VIH/VIL thresholds and internal clamping diodes, while ECL outputs (Q_1–8) are designed for 50 Ω termination to –2 V - a condition explicitly specified in the switching characteristics test setup. The OE input also meets ECL-level thresholds without external biasing.

How does the output enable (OE) function interact with the internal flip-flop state in the SN10KHT5578DW?

In the SN10KHT5578DW, the OE input operates independently of the internal D-flip-flop operation. When OE is asserted (low), all Q outputs go high-impedance, but the stored logic states in the eight flip-flops remain unchanged. This allows new data to be loaded into the D inputs or retained while outputs are disabled - enabling glitch-free bus sharing and dynamic output gating without disrupting internal synchronization.

What is the maximum clock frequency supported by the SN10KHT5578DW, and what conditions define that limit?

The SN10KHT5578DW supports a maximum clock frequency of 180 MHz, as specified in the timing requirements table of the SDZS014A datasheet. This limit is defined under recommended operating conditions: VCC = 4.5–5.5 V, VEE = –4.94 to –5.46 V, and TA = 0°C to 75°C. It reflects the device's ability to meet setup/hold timing (tsu = 1.5 ns, th = 1 ns) and propagation delay (tPLH/tPHL ≤ 2.2/2.1 ns) consistently across process, voltage, and temperature corners.

Is the SN10KHT5578DW RoHS compliant, and what is its moisture sensitivity level (MSL)?

Yes, the SN10KHT5578DW is RoHS compliant and classified as "Green (RoHS & no Sb/Br)" per TI's packaging documentation. Its moisture sensitivity level is MSL Level-1 with a peak reflow temperature of 260°C unlimited - indicating it may be stored indefinitely at ambient conditions without baking prior to surface-mount assembly.