Texas Instruments SN75LVDT1422PAGR

Overview

SN75LVDT1422PAGR from Texas Instruments is a 14-bit full-duplex LVDS serializer/deserializer IC supporting 10–100 MHz shift clock, integrated 100 Ω termination resistors, 175 MB/s bidirectional throughput, and low-power operation (357 mW typ at 100 MHz). It converts 14-bit LVTTL parallel data to two LVDS serial streams plus one LVDS clock (TX), and reconstructs 14-bit LVTTL outputs from three LVDS inputs (RX), enabling high-speed cable interconnects in imaging and peripheral systems.

For engineers reviewing the SN75LVDT1422PAGR datasheet, SN75LVDT1422PAGR pinout, SN75LVDT1422PAGR application, or SN75LVDT1422PAGR equivalent, key selection criteria include its dual independent PLL architecture, R/F edge-selectable TX clock triggering, spread-spectrum clock tracking up to 100 kHz, receiver failsafe biasing, and TQFP-64 package with segregated power domains for TX/RX/PLL sections.

Technical Context

The SN75LVDT1422PAGR implements two functionally independent data paths: a 14-bit parallel-to-serial transmitter (TA[0:6]/TB[0:6] → TA±/TB± + TCLK±) and a 14-bit serial-to-parallel receiver (RA±/RB± + RCLK± → RA[0:6]/RB[0:6]). Each path uses a dedicated PLL-transmitter multiplies CLK IN by 7× for serialization; receiver divides RCLK± by 7× for deserialization-enabling asynchronous operation between TX and RX domains.

It supports TIA/EIA-644 LVDS compliance on all differential I/Os, integrates three 90–132 Ω termination resistors per LVDS input pair (RA±, RB±, RCLK±), and provides failsafe biasing that holds TTL outputs high during floating LVDS inputs when RX ENABLE is active. Power-down mode draws <500 µW, and no external PLL components are required.

Key Specifications

Pinout & Package

SN75LVDT1422PAGR is housed in a 64-pin TQFP (PAG) package with 0.5 mm pitch, 10.2 mm × 10.2 mm body, and exposed thermal pad. Power domains are physically separated: TX VCC/GND (pins 22,27,32/18,36), RX VCC/GND (pins 1,7,12/6,16,60), TX/RX LVDS supplies (pins 47,40/58,51), and TX/RX PLL supplies (pins 38,39/49,50).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LVDS1422PAGR and DS90CR288AMTDX, SN75LVDT1422PAGR offers optimal balance of integration (on-chip termination, no external PLL), commercial-temperature suitability, and minimal BOM for mid-bandwidth parallel-to-LVDS bridging in office peripherals.

Availability

SN75LVDT1422PAGR is available at Aetrix Electronics and suitable for printers, plain paper copiers, flash memory card adapters, and industrial imaging systems requiring stable component supply throughout product lifecycles.

Supply support for SN75LVDT1422PAGR 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 over 50 years of innovation in high-reliability interface solutions.

The SN75LVDT1422PAGR belongs to TI's LVDS SerDes product line, designed specifically to replace bulky parallel buses in imaging, printing, and storage peripherals while minimizing EMI, cable cost, and PCB routing complexity.

FAQ

What is the primary function of the SN75LVDT1422PAGR?

The SN75LVDT1422PAGR is a 14-bit full-duplex LVDS serializer/deserializer IC. It converts 14-bit LVTTL parallel data into two LVDS serial streams plus one LVDS clock signal for transmission, and simultaneously reconstructs 14-bit LVTTL parallel outputs from three incoming LVDS signals (two data, one clock). Its dual independent PLL architecture allows asynchronous TX and RX operation, making SN75LVDT1422PAGR ideal for bidirectional high-speed interconnects in imaging and peripheral systems.

Does the SN75LVDT1422PAGR require external termination resistors?

No, the SN75LVDT1422PAGR integrates three 90–132 Ω termination resistors for its LVDS receiver inputs (RA±, RB±, RCLK±), eliminating the need for external resistors. This reduces bill-of-materials count, saves PCB area, and improves signal integrity by matching characteristic impedance directly at the input pins. The transmitter outputs (TA±, TB±, TCLK±) remain unterminated and must be matched at the far-end receiver per TIA/EIA-644 LVDS standard-SN75LVDT1422PAGR itself does not provide TX-side termination.

How does the R/F pin affect operation of the SN75LVDT1422PAGR?

On the SN75LVDT1422PAGR, the R/F (Rising/Falling) pin selects the clock edge used to load data into the transmitter's parallel input registers. When R/F is high, CLK IN's rising edge triggers sampling of TA[0:6] and TB[0:6]; when low, the falling edge is used. This feature allows synchronization flexibility with upstream controllers having asymmetric clock duty cycles. The R/F pin has no effect on the receiver path-CLK OUT timing and data validity remain fixed to the falling edge of CLK OUT regardless of R/F state.

What happens to outputs when SN75LVDT1422PAGR enters power-down mode?

When SN75LVDT1422PAGR enters power-down mode (TX ENABLE = low and/or RX ENABLE = low), distinct behaviors occur per path. With TX ENABLE low, all LVDS outputs (TA±, TB±, TCLK±) go to high-impedance state and the TX PLL shuts down. With RX ENABLE low, all 14 LVTTL outputs (RA[0:6], RB[0:6]) and CLK OUT are driven low-regardless of input status-and the RX PLL shuts down. Total quiescent current drops to <500 µW typ, enabling ultra-low-power standby in battery-sensitive applications using SN75LVDT1422PAGR.

Is the SN75LVDT1422PAGR compatible with spread spectrum clocking?

Yes, the SN75LVDT1422PAGR supports spread spectrum clocking (SSCG) on its CLK IN pin. It accurately tracks SSCG-modulated inputs with linear profiles up to 100 kHz modulation frequency and ±2.5% center-spread or –5% down-spread deviation. This capability reduces electromagnetic interference (EMI) peaks in systems where the source clock is intentionally modulated-critical for meeting FCC/CE emissions limits in printers and copiers using SN75LVDT1422PAGR. The TCLK± outputs faithfully replicate the spread spectrum characteristics of the input clock.