Texas Instruments SN75LVDT1422PAG

Overview

SN75LVDT1422PAG from Texas Instruments is a 14-bit full-duplex LVDS serializer/deserializer in a 64-pin TQFP package, supporting 10–100 MHz shift clock, 175 MB/s bidirectional data throughput, integrated LVDS termination, and spread-spectrum clocking-designed for high-speed parallel-to-serial conversion in printer and copier backplanes.

For engineers reviewing the SN75LVDT1422PAG datasheet, SN75LVDT1422PAG pinout, SN75LVDT1422PAG application, or SN75LVDT1422PAG equivalent, key selection criteria include LVDS input/output compatibility per TIA/EIA-644, dual independent PLL operation, 7× clock multiplication, <500 µW power-down current, and 64-pin TQFP mechanical footprint with 0.5 mm pitch.

Technical Context

The SN75LVDT1422PAG implements two functionally independent data paths: a 14-bit parallel-to-serial transmitter (TA[0:6]/TB[0:6] inputs → TA±/TB±/TCLK± outputs) and a 14-bit serial-to-parallel receiver (RA±/RB±/RCLK± inputs → RA[0:6]/RB[0:6]/CLK OUT outputs), each with dedicated PLLs and configurable edge-triggered sampling via R/F pin.

It integrates three 100 Ω differential termination resistors on LVDS inputs, supports spread-spectrum clocking up to ±2.5% center-spread at 100 kHz modulation frequency, and delivers <150 ps cycle-to-cycle jitter at 100 MHz while maintaining valid TTL output timing referenced to CLK OUT falling edge.

Key Specifications

Pinout & Package

SN75LVDT1422PAG uses a 64-pin TQFP (PAG) package with 0.5 mm pitch, 10.2 mm × 10.2 mm body, and exposed thermal pad (not electrically connected). Pin functions are validated per TI SLLS653 datasheet Figures 2 and 3 and Terminal Functions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LVDS1422PAG and DS90CR288AMTDX, the SN75LVDT1422PAG offers optimal balance of integration (on-chip termination), power efficiency (<360 mW), and industrial-grade temperature range-making it ideal for cost-sensitive, space-constrained printer/copier designs where full pin compatibility and minimal BOM count are critical.

Availability

SN75LVDT1422PAG is available at Aetrix Electronics and suitable for printer backplanes, plain paper copier imaging subsystems, and flash memory card interfaces requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN75LVDT1422PAG 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 ICs.

The SN75LVDT1422PAG belongs to TI's LVDS SerDes product line, engineered specifically for reducing EMI and cable count in office automation equipment while maintaining precise timing integrity across noisy industrial environments.

FAQ

What is the maximum supported clock frequency for SN75LVDT1422PAG?

The SN75LVDT1422PAG supports an input clock frequency range of 10 MHz to 100 MHz per its datasheet (SLLS653). At 100 MHz CLK IN, the device achieves 175 MB/s bidirectional throughput using 7× serialization. Operation above 100 MHz is not characterized or guaranteed, and timing margins degrade beyond this limit due to propagation delays and jitter accumulation.

Does SN75LVDT1422PAG require external termination resistors?

No, the SN75LVDT1422PAG integrates three 100 Ω differential termination resistors for LVDS inputs (RA±, RB±, RCLK±), eliminating the need for external components. This reduces PCB area, simplifies layout, and improves signal integrity-confirmed in the Terminal Functions table and Applications section of the TI SLLS653 datasheet.

How does the R/F pin affect SN75LVDT1422PAG operation?

The R/F pin on the SN75LVDT1422PAG selects the CLK IN edge used by the transmitter: high = rising-edge sampling, low = falling-edge sampling. This setting applies only to the serializer path; the deserializer uses RCLK± edge detection independently. The feature enables timing alignment with legacy controllers that require inverted clock phase relationships.

What happens to outputs when SN75LVDT1422PAG enters power-down mode?

When TX ENABLE is pulled low, the SN75LVDT1422PAG places TA±, TB±, and TCLK± outputs in high-impedance state and shuts down the TX PLL. When RX ENABLE is pulled low, RA[0:6], RB[0:6], and CLK OUT go to a known low state, and the RX PLL is disabled. Total supply current drops to <800 µA in combined disable mode.

Is SN75LVDT1422PAG compatible with 5-V logic interfaces?

No, the SN75LVDT1422PAG LVTTL/LVCMOS I/O pins (CLK IN, CLK OUT, TA[0:6], etc.) are rated for 3.3 V operation only and are not 5-V tolerant. Applying 5 V to any input may cause permanent damage. Interface with 5-V systems requires level-shifting circuitry, as explicitly stated in the "Transmitter Input, Receiver Output Pins" section of the datasheet.