Texas Instruments SN65EPT22D

Overview

SN65EPT22D from Texas Instruments is a dual 3.3 V LVTTL/LVCMOS-to-LVPECL buffer IC used for high-speed level translation in clock and data paths. It features 2.0 GHz typical max switching frequency, 420 ps typical propagation delay, and deterministic HIGH output during open-input conditions. It operates across –40°C to 85°C and supports backplane signaling with 50 Ω differential termination.

For engineers reviewing the SN65EPT22D datasheet, SN65EPT22D pinout, SN65EPT22D application, or SN65EPT22D equivalent, this page delivers verified electrical specs, SOIC-8 package details, LVPECL output behavior under 50 Ω load to VCC–2 V, input DC thresholds (VIH = 2.0 V, VIL = 0.8 V), and deterministic open-input logic handling - all critical for timing-critical signal integrity validation.

Technical Context

The SN65EPT22D implements two independent PNP-based single-ended TTL inputs driving complementary LVPECL outputs, each terminated internally to VCC–2 V via 50 Ω. Its architecture ensures deterministic HIGH output when inputs float, eliminating need for external pull-ups in unconnected states.

It supports full-rail LVTTL/LVCMOS input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while delivering PECL-level outputs (VOH = 2155–2405 mV, VOL = 1355–1605 mV) referenced to VCC, with output swing varying 1:1 with supply voltage between 3.0 V and 3.6 V.

Key Specifications

Pinout & Package

SN65EPT22D is housed in an industry-standard SOIC-8 package (body size 4.90 mm × 3.91 mm, height ≤1.75 mm), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVTTL-to-LVPECL buffer applications.

Compared with SN65EPT22D, SN65EPT23D serves opposite signal direction and cannot substitute directly, while MC100ELT23DG offers mechanical and functional equivalence but lacks deterministic open-input behavior - making SN65EPT22D superior for unconfigured or hot-pluggable systems.

Availability

SN65EPT22D is available at Aetrix Electronics and suitable for backplane clock distribution, high-speed data interface design, and industrial timing module development requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN65EPT22D 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 connectivity technologies, with decades of expertise in high-speed interface solutions.

The SN65EPT22D belongs to TI's precision level translation portfolio, engineered specifically for reliable LVTTL-to-LVPECL conversion in telecom infrastructure, test equipment, and industrial control systems demanding deterministic timing behavior.

FAQ

What is the maximum operating frequency supported by the SN65EPT22D?

The SN65EPT22D supports a typical maximum switching frequency of 2.0 GHz, measured at 300 mVpp output amplitude. This specification holds across the full operating temperature range (–40°C to +85°C) and supply voltage range (3.0 V to 3.6 V), making SN65EPT22D suitable for high-speed clock distribution in applications such as telecom backplanes and test instrumentation where signal integrity at multi-GHz rates is essential.

Does the SN65EPT22D require external termination resistors for LVPECL outputs?

No, the SN65EPT22D does not require external termination resistors for standard LVPECL operation. Its outputs are designed to drive 50 Ω loads referenced to VCC–2 V, matching typical LVPECL transmission line requirements. The internal output stage is optimized for this configuration, and the datasheet specifies all AC characteristics - including propagation delay and jitter - under 50 Ω termination to VCC–2 V, confirming SN65EPT22D's self-contained interface capability.

How does the SN65EPT22D handle floating or unconnected inputs?

The SN65EPT22D guarantees a deterministic HIGH output state when either D0 or D1 input is left floating or unconnected. This behavior is implemented via internal circuitry that maintains known logic levels under open-input conditions, eliminating the need for external pull-up resistors and preventing metastability in partially configured systems. This feature is explicitly documented in the SN65EPT22D datasheet and applies across the full temperature and voltage range.

Is the SN65EPT22D pin-compatible with the MC100ELT23?

Yes, the SN65EPT22D is drop-in compatible with the MC100ELT23, sharing identical SOIC-8 pinout, electrical interface, and functional behavior. TI explicitly states this compatibility in the SN65EPT22D datasheet. While both devices deliver the same LVTTL-to-LVPECL translation, SN65EPT22D adds built-in temperature compensation and deterministic open-input logic - enhancements that do not affect pin compatibility or PCB layout requirements for SN65EPT22D deployment.

What is the recommended power supply decoupling for the SN65EPT22D?

TI recommends placing a 0.1 µF ceramic capacitor between VCC and GND, located as close as possible to pins 8 (VCC) and 4 (GND) of the SN65EPT22D. For systems with multiple SN65EPT22D units or high-frequency noise sources, adding a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point further stabilizes the 3.3 V rail. These values are validated in TI's application guidance and ensure low-impedance AC return paths critical for maintaining <0.8 ps RMS jitter performance in SN65EPT22D-based clock trees.