Texas Instruments SN75DPHY440SSRHRR

Overview

SN75DPHY440SS from Texas Instruments is a MIPI® DPHY 1.1-compliant retimer IC for CSI-2/DSI interfaces, supporting up to 4 data lanes + clock at 1.5 Gbps, operating across 0°C to 70°C, with configurable RX equalization (0/2.5/5 dB), adjustable TX voltage swing (200–220 mV), and dynamic data/clock skew compensation. It enables low-cost cable solutions in mobile camera and display interconnects.

For engineers reviewing the SN75DPHY440SS datasheet, SN75DPHY440SS pinout, SN75DPHY440SS application, or SN75DPHY440SS equivalent, this page delivers verified electrical specs, WQFN-28 pin mapping, real-world timing behavior (tSKEW-TX-1P5G ±0.15 UI), LP/ULPS power-state support, and I²C-configurable HS/LP interface parameters - all critical for high-speed MIPI signal integrity validation and layout planning.

Technical Context

The SN75DPHY440SS implements a full DPHY link-layer retimer with independent HS receive equalization (sampled at RSTN rising edge via EQ/SCL pin), programmable TX pre-emphasis (0 or 2.5 dB), and dynamic de-skew that centers data within the clock window with 4-UI latency. Its dual-mode LP/HS operation supports bidirectional LP backchannel on Lane 0 only.

It features three-level configurable control pins (VSADJ_CFG0, PRE_CFG1, ERC/SDA, EQ/SCL) with internal 100-kΩ pull-up/down resistors, operates from a single 1.8 V ±10% supply, and integrates a 1.2 V LDO regulator (VREG_OUT) requiring 0.1 µF decoupling. Thermal resistance is R_θJA = 42.1°C/W in the RHR package.

Key Specifications

Pinout & Package

SN75DPHY440SS is housed in a 5.5 mm × 3.5 mm WQFN-28 package (RHR) with exposed thermal pad (GND). Pin count, pitch (0.5 mm), and land pattern match JEDEC MO-220 standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DPHY retimer applications.

Compared with SN65DPHY440SS, the SN75DPHY440SS trades extended temperature range for commercial-grade cost optimization, while SN75DPHY440RSMT adds I²C addressability at the expense of larger package size - making SN75DPHY440SS optimal for space-constrained, thermally benign consumer mobile designs.

Availability

SN75DPHY440SS is available at Aetrix Electronics and suitable for notebook PCs, tablets, mobile cameras, and clamshell displays requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for SN75DPHY440SS 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 MIPI interface IP development and automotive-grade reliability validation.

The SN75DPHY440SS belongs to TI's MIPI DPHY retimer product line, designed specifically to solve signal integrity degradation in high-speed mobile imaging and display interconnects - targeting compact, power-sensitive, and thermally constrained end equipment.

FAQ

What is the maximum supported MIPI DPHY data rate for SN75DPHY440SS?

The SN75DPHY440SS supports up to 1.5 Gbps per lane with compliant HS signaling, validated across the full 100–750 MHz clock range. This enables full-bandwidth operation for 4-lane CSI-2 video streams (e.g., 4K@30fps) and high-refresh DSI panels. Performance is guaranteed under recommended operating conditions (VCC = 1.8 V, TA = 0°C to 70°C).

Does SN75DPHY440SS support bidirectional LP communication on all lanes?

No. SN75DPHY440SS supports bidirectional LP backchannel only on Lane 0 (DA0P/N ↔ DB0P/N), as required by MIPI DSI specification. Lanes 1–3 and clock are unidirectional in LP mode. This limitation is inherent to the device architecture and documented in Section 6.4.2 of the datasheet.

How is dynamic de-skew implemented in SN75DPHY440SS, and what is its latency?

SN75DPHY440SS performs continuous, real-time de-skew in HS mode by aligning each data lane to the recovered clock edge, centering data within the clock window. This introduces a fixed 4-UI (2-clock-cycle) latency from DA input to DB output. The feature operates autonomously without register configuration and is active whenever HS mode is entered.

Can SN75DPHY440SS operate with only a 1.8 V supply, or is a separate 1.2 V rail required?

SN75DPHY440SS requires only a single 1.8 V supply (VCC). Its internal LDO generates a regulated 1.2 V (VREG_OUT) for core logic; VDD must be connected directly to VREG_OUT with a 0.1 µF capacitor to GND. No external 1.2 V source is needed - simplifying power delivery in space-constrained layouts.

What are the I²C address and timing constraints for configuring SN75DPHY440SS registers?

SN75DPHY440SS uses a fixed 7-bit I²C address of 0x6C (1101100b), supporting standard-mode (≤100 kHz) operation only. Timing parameters include tLOW ≥ 4.7 µs, tHIGH ≥ 4 µs, and tSU;DAT ≥ 250 ns. Configuration is active during ULPS and LP modes, but not in shutdown (RSTN = low).