Texas Instruments SN10KHT5578NT

Overview

SN10KHT5578NT from Texas Instruments is an octal TTL-to-ECL translator with edge-triggered D-type flip-flops and ECL-compatible output enable, operating from 0°C to 75°C, supporting 180 MHz clock frequency, –5.2 V ECL supply (VEE), and 5 V TTL supply (VCC), used in high-speed CPU/bus address drivers and clock distribution systems.

For engineers reviewing the SN10KHT5578NT datasheet, SN10KHT5578NT pinout, SN10KHT5578NT application, or SN10KHT5578NT equivalent, key selection considerations include TTL/ECL dual-supply interface capability, noninverting flow-through architecture for PCB layout optimization, guaranteed timing margins (tsu = 1.5 ns, th = 1 ns), and NT-package thermal performance (θJA = 67°C/W).

Technical Context

This device implements eight independent D-type flip-flops triggered on the positive edge of a TTL-level clock input while accepting ECL-level control signals (OE), enabling synchronous data latching across logic families. It maintains internal state regardless of OE status, allowing data retention during output disable.

Its flow-through pinout places VCC, VEE, and GND at center pins to minimize high-speed switching noise, and supports termination via 50-Ω to –2 V for ECL output compliance. Input voltage ranges span –1.2 V to 7 V (TTL) and VEE to 0 V (ECL), with ECL logic thresholds specified at –1130 mV (VIH) and –1950 mV (VIL) at 25°C.

Key Specifications

Pinout & Package

SN10KHT5578NT uses a 24-pin plastic dual-in-line package (PDIP-NT), with center-aligned power/ground pins (pins 12, 13, 14, 15 = GND; pin 16 = VCC; pin 17 = VEE; pin 18 = CLK) to reduce simultaneous switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN10KHT5578DW and SN10KHT5577NT, the SN10KHT5578NT uniquely combines through-hole PDIP packaging, integrated D-flip-flop storage, and ECL output enable-making it the sole option for legacy through-hole designs requiring registered TTL-to-ECL translation with output gating.

Availability

SN10KHT5578NT is available at Aetrix Electronics and suitable for CPU bus interface, memory address driver, and high-speed clock distribution applications requiring stable component supply and long-term industrial availability.

Supply support for SN10KHT5578NT 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN10KHT5578NT belongs to TI's 10KH ECL translator product line, designed specifically to bridge TTL logic domains with high-speed ECL systems in CPU, memory, and test equipment architectures.

FAQ

What is the maximum clock frequency supported by the SN10KHT5578NT?

The SN10KHT5578NT supports a maximum clock frequency of 180 MHz under recommended operating conditions. This specification is validated across the full temperature range (0°C to 75°C) and supply voltage tolerances (VCC = 4.5–5.5 V, VEE = –4.94 to –5.46 V). The SN10KHT5578NT achieves this using optimized internal propagation paths and edge-triggered D-flip-flop design, making it suitable for high-speed bus and memory interface applications where timing precision is critical.

Does the SN10KHT5578NT require both TTL and ECL power supplies?

Yes, the SN10KHT5578NT requires two independent power supplies: a +5 V TTL supply (VCC, pin 16) for TTL-input circuitry and clock reception, and a –5.2 V ECL supply (VEE, pin 17) for ECL-output drivers and OE input. The device does not generate internal level-shifted rails; both supplies must be externally provided and properly decoupled. The SN10KHT5578NT datasheet specifies absolute maximum ratings of VCC = –0.5 to 7 V and VEE = –8 to 0 V, but functional operation is guaranteed only within the recommended ranges.

How does the output enable (OE) function interact with the internal flip-flops in the SN10KHT5578NT?

In the SN10KHT5578NT, the OE input (pin 24, ECL-level active-low) controls only the output drivers and has no effect on internal D-flip-flop operation. While OE is asserted (high), the Q outputs go to high-impedance, but the stored logic states remain intact and continue updating on each CLK↑ transition. This allows the SN10KHT5578NT to retain valid data during bus contention or power sequencing events, enabling seamless re-enabling without resynchronization. The behavior is explicitly confirmed in the device's function table and description.

What package type and pin count does the SN10KHT5578NT use?

The SN10KHT5578NT uses a 24-pin plastic dual-in-line package (PDIP-NT), as confirmed by TI's official packaging information and mechanical drawing MPDI004. Its dimensions are 1.230–1.260 inches in length, 0.290–0.315 inches in width, and 0.125 inches minimum height. The NT package features through-hole mounting and is RoHS-compliant with Pb-Free (RoHS) lead finish. This distinguishes the SN10KHT5578NT from the DW variant, which uses a 24-pin SOIC package.

Is the SN10KHT5578NT compatible with standard 10KH ECL logic families?

Yes, the SN10KHT5578NT is explicitly characterized as "10KH Compatible" per its datasheet title and electrical specifications. Its ECL output voltage levels (VOH = –810 mV, VOL = –1630 mV), input thresholds (VIH = –1130 mV, VIL = –1950 mV), and timing parameters (tPLH/tPHL ≤ 4 ns) meet TI's 10KH family standards. The SN10KHT5578NT also supports the same 50 Ω to –2 V termination scheme and shares identical noise immunity and drive strength characteristics required for interoperability within 10KH ECL systems.