Texas Instruments SN65EPT22DGKR

Overview

SN65EPT22DGKR from Texas Instruments is a dual 3.3 V LVTTL/LVCMOS-to-LVPECL buffer IC used for high-speed clock and data level translation in backplane signaling. It delivers deterministic HIGH output during open-input conditions, supports up to 2.0 GHz (typ) switching frequency, exhibits 420 ps typical propagation delay, and operates across –40°C to 85°C with LVPECL V_CC = 3.0–3.6 V.

For engineers reviewing the SN65EPT22DGKR datasheet, SN65EPT22DGKR pinout, SN65EPT22DGKR application, or SN65EPT22DGKR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for signal integrity-critical timing interfaces.

Technical Context

The SN65EPT22DGKR implements two independent PNP-based single-ended TTL inputs driving complementary LVPECL outputs terminated to V_CC – 2.0 V via external 50 Ω resistors. Its internal circuitry ensures known logic HIGH state under open-input conditions without pull-up resistors.

It features built-in temperature compensation to stabilize output voltage levels across –40°C to 85°C, and supports deterministic skew control: within-device skew ≤50 ps (max), device-to-device skew ≤200 ps (max), with random clock jitter as low as 0.2 ps RMS.

Key Specifications

Pinout & Package

VSSOP-8 package (DGK), 3.00 mm × 3.00 mm body, 1.1 mm max height, lead-free NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC100ELT23DG and SN65LVEP22DGKR, the SN65EPT22DGKR uniquely combines open-input biasing, VSSOP-8 compactness, and guaranteed 2.0 GHz operation at 3.3 V-making it optimal for space-constrained, thermally variable backplane timing applications where input configuration flexibility is essential.

Availability

SN65EPT22DGKR is available at Aetrix Electronics and suitable for backplane clock distribution, high-speed SerDes interfacing, and optical line card timing requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for SN65EPT22DGKR 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 high-performance signal chain technologies, with decades of expertise in timing, interface, and power management ICs.

The SN65EPT22DGKR belongs to TI's high-speed interface buffer product line, engineered specifically for reliable LVTTL-to-LVPECL translation in telecom infrastructure, enterprise networking, and test instrumentation where signal integrity and thermal stability are critical.

FAQ

What is the recommended termination for SN65EPT22DGKR LVPECL outputs?

The SN65EPT22DGKR LVPECL outputs require 50 Ω resistive termination to V_CC – 2.0 V, as specified in Figure 1 of the datasheet. This ensures proper common-mode voltage (≈1.6 V) and differential swing (≈800 mVpp). Using 50 Ω to ground or V_CC alone violates LVPECL standards and degrades SN65EPT22DGKR output amplitude and jitter performance.

Does SN65EPT22DGKR support 2.5 V LVTTL inputs?

No-SN65EPT22DGKR is specified only for 3.3 V LVTTL/LVCMOS inputs (V_IH = 2.0 V min, V_IL = 0.8 V max). While 2.5 V logic may occasionally register, TI does not guarantee functionality or timing at 2.5 V input levels. For 2.5 V compatibility, consider SN65LVEP22DGKR instead.

Is SN65EPT22DGKR pin-compatible with SN65EPT22DGK?

Yes-SN65EPT22DGKR and SN65EPT22DGK share identical VSSOP-8 (DGK) pinout, electrical specifications, and thermal characteristics. The "R" suffix denotes tape-and-reel packaging (2500 pcs/reel), while DGK indicates tube packaging (80 pcs/tube); both use the same silicon die and marking "SIQI".

What is the maximum junction temperature for continuous operation of SN65EPT22DGKR?

The SN65EPT22DGKR has an absolute maximum junction temperature of 150°C, but its recommended operating junction temperature is ≤125°C. With R_θJA = 213°C/W (low-K board), 50 mA supply current, and 3.3 V V_CC, power dissipation is ~165 mW-keeping T_J well within limits at ambient ≤85°C with minimal airflow.

Can SN65EPT22DGKR drive unterminated 50 Ω transmission lines?

No-SN65EPT22DGKR LVPECL outputs must be terminated per JEDEC PECL standards: each output pair (e.g., Q0/Q0̅) requires two 50 Ω resistors-one from Q0 to V_CC – 2.0 V and one from Q0̅ to V_CC – 2.0 V. Unterminated lines cause reflections, amplitude collapse, and increased jitter, violating SN65EPT22DGKR AC specifications.