Texas Instruments SN65LVDS94DGGRG4

Overview

SN65LVDS94DGGRG4 from Texas Instruments is an LVDS deserializer IC that converts 5-channel LVDS serial input (4 data + 1 clock) into 28-bit LVTTL parallel output at up to 1.904 Gbps aggregate throughput, with 7× internal clock multiplication, single 3.3-V supply operation, and industrial temperature range (–40°C to 85°C). It serves as the receiver in point-to-point high-speed backplane or board-to-board links.

For engineers reviewing the SN65LVDS94DGGRG4 datasheet, SN65LVDS94DGGRG4 pinout, SN65LVDS94DGGRG4 application, or SN65LVDS94DGGRG4 equivalent, key selection criteria include its 28-bit LVTTL output bus timing alignment to CLKOUT rising edge, 20–68 MHz PLL input frequency range, 4-kV HBM ESD tolerance on bus pins, and compatibility with SN65LVDS93/SN65LVDS95 transmitter pairs.

Technical Context

The SN65LVDS94DGGRG4 implements four 7-bit serial-in/parallel-out shift registers synchronized to a 7× PLL-generated internal clock derived from CLKINP/CLKINM differential input. Data recovery occurs at seven times the input clock rate, then is demultiplexed and presented synchronously on the 28-bit LVTTL output bus at the original CLKIN rate.

Its functional architecture includes five integrated LVDS receivers (four for data lanes A0–A3, one for clock), a phase-locked loop with no external components required, and active-low SHTDN control enabling <1 mW standby power. All 28 outputs are LVTTL-compatible with 2.4 V VOH and 0.4 V VOL under 4-mA load.

Key Specifications

Pinout & Package

Packaged in a 56-pin Thin Shrink Small-Outline Package (TSSOP-DGG), 13.9 mm × 6.1 mm × 1.2 mm max height, 0.5-mm pitch, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LVDS deserializer applications.

Compared with SN65LVDS94DGGRG4, SN65LVDS94DGGR offers identical functionality but lacks the G4 finish specification, while DS90CR286MTD provides mechanical compatibility at the cost of reduced clock range, higher power, and no 5-V tolerant shutdown - making SN65LVDS94DGGRG4 the preferred choice for new designs requiring robust industrial operation and simplified system-level control.

Availability

SN65LVDS94DGGRG4 is available at Aetrix Electronics and suitable for backplane extension, virtual backplane transceivers, and industrial camera interfaces requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for SN65LVDS94DGGRG4 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 specializing in analog, embedded processing, and connectivity technologies, with leadership in high-speed interface solutions.

The SN65LVDS94DGGRG4 belongs to TI's LVDS SerDes product line, engineered specifically for noise-immune, high-bandwidth point-to-point data transport in industrial, telecom, and imaging systems.

FAQ

What is the maximum supported input clock frequency for SN65LVDS94DGGRG4?

The SN65LVDS94DGGRG4 supports an input clock frequency range of 20 MHz to 68 MHz, as specified in the recommended operating conditions. At 68 MHz, the device achieves its maximum aggregate throughput of 1.904 Gbps (28 bits × 68 MHz). Operation above 68 MHz is not characterized and may result in timing violations or loss of PLL lock. The SN65LVDS94DGGRG4 datasheet confirms this limit applies across the full industrial temperature range (–40°C to 85°C).

Does SN65LVDS94DGGRG4 require external passive components for PLL operation?

No, the SN65LVDS94DGGRG4 integrates a complete PLL with no external components required. Its internal 7× clock synthesizer uses only the differential CLKINP/CLKINM input to generate both the internal high-speed sampling clock and the synchronized CLKOUT output. This eliminates the need for external loop filter resistors or capacitors, simplifying layout and reducing BOM count. The SN65LVDS94DGGRG4 datasheet explicitly states "No External Components Required for PLL" as a key feature.

How does the SHTDN pin function on SN65LVDS94DGGRG4?

The SHTDN pin on SN65LVDS94DGGRG4 is an active-low shutdown control that clears all internal registers to logic low and disables the LVDS input receivers when asserted. It is 5-V tolerant, allowing direct connection to 5-V control logic without level shifting. When pulled high, the device operates normally; when pulled low, power drops to <1 mW. The SN65LVDS94DGGRG4 datasheet specifies tdis = 400 ns disable time and ten = 1 ms enable time after SHTDN release.

What is the output timing relationship between CLKOUT and D0–D27 on SN65LVDS94DGGRG4?

On SN65LVDS94DGGRG4, valid data appears on D0–D27 outputs aligned to the rising edge of CLKOUT. The datasheet specifies setup time (tsu) and hold time (th) of 4–6 ns relative to CLKOUT, with output transition time (tt) ≤3 ns. This ensures deterministic latching at the destination without additional delay compensation. The SN65LVDS94DGGRG4 functional description confirms "presents valid data on the rising edge of the output clock (CLKOUT)" - a critical timing guarantee for synchronous system integration.

Is SN65LVDS94DGGRG4 compatible with SN65LVDS93 as a transmitter pair?

Yes, SN65LVDS94DGGRG4 is explicitly designed as the receiver counterpart to SN65LVDS93 (and SN65LVDS95) transmitters. The datasheet states it "allows receipt of synchronous data from a compatible transmitter, such as the SN65LVDS93 and SN65LVDS95", and application diagrams (Figures 11–13) show them operating as matched serdes pairs. Both share identical 4:28 expansion ratio, 7× clock multiplication, and ANSI/EIA/TIA-644 LVDS compliance - ensuring interoperability without protocol translation.