Texas Instruments SN65LV1224BMDBREP

Overview

SN65LV1224BMDBREP from Texas Instruments is a radiation-hardened LVDS deserializer IC for high-reliability serial backplane communication. It receives 10-bit parallel data at 10–66 MHz via embedded clock recovery from LVDS serial streams (120–792 Mbps), features programmable RCLK edge selection, lock indication, and operates across –55°C to 125°C for aerospace and defense systems.

For engineers reviewing the SN65LV1224BMDBREP datasheet, SN65LV1224BMDBREP pinout, SN65LV1224BMDBREP application, or SN65LV1224BMDBREP equivalent, key selection criteria include deterministic synchronization mode timing, ±50 mV LVDS input threshold sensitivity, fail-safe biasing for unconnected inputs, power-down and high-impedance output control, and compatibility with SN65LV1023A serializer in chipset configurations.

Technical Context

The SN65LV1224BMDBREP implements a phase-locked loop (PLL) for clock recovery from LVDS serial data, supporting both rapid synchronization using internally generated SYNC patterns and random-lock operation on arbitrary data streams. Its deserialization logic reconstructs 10-bit parallel outputs (ROUT0–ROUT9) with start/stop bit framing and embeds recovered clock (RCLK) with selectable rising/falling-edge strobing via RCLK_R/F.

It integrates fail-safe biasing to prevent false lock on floating LVDS inputs, detects repetitive multitransition (RMT) patterns to avoid false synchronization, and provides LOCK status output that transitions low only upon stable PLL lock to valid data boundaries. Power management includes PWRDN-driven full power-down and REN-controlled high-impedance output state without loss of PLL lock.

Key Specifications

Pinout & Package

SN65LV1224BMDBREP is housed in a 28-pin SSOP (DB) package with exposed thermal pad, optimized for space-constrained high-reliability PCB layouts. Pin functions are validated per TI SGLS358 datasheet Figure 1 and Terminal Functions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN65LV1224BMDREP, the SN65LV1224BMDBREP offers leaded SSOP packaging for legacy manufacturing and enhanced mechanical reliability, while DS92LV1224TMA/NOPB trades radiation tolerance and extended temperature capability for lower unit cost in benign environments.

Availability

SN65LV1224BMDBREP is available at Aetrix Electronics and suitable for avionics data links, satellite telemetry systems, rad-hard FPGA interconnects, and defense radar signal processing requiring stable component supply across extended temperature and radiation-exposed conditions.

Supply support for SN65LV1224BMDBREP 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-reliability technologies with decades of heritage in aerospace and defense components.

The SN65LV1224BMDBREP belongs to TI's Space Enhanced Plastic (SEP) product line, engineered specifically for mission-critical applications demanding radiation tolerance, extended temperature operation, and long-term supply chain stability.

FAQ

What is the primary function of the SN65LV1224BMDBREP in a serdes system?

The SN65LV1224BMDBREP is a 10-bit LVDS deserializer that recovers clock and data from serial differential streams (120–792 Mbps) and outputs synchronized 10-bit parallel LVTTL data (ROUT0–ROUT9) with recovered RCLK. It forms the receive half of a chipset with the SN65LV1023A serializer and is essential for high-integrity backplane communication in radiation-hardened systems. The SN65LV1224BMDBREP implements deterministic synchronization, fail-safe biasing, and RMT detection to ensure robust operation.

How does the SN65LV1224BMDBREP achieve deterministic lock time?

The SN65LV1224BMDBREP achieves deterministic lock time-850 × REFCLK cycles maximum-by using internally generated SYNC patterns transmitted by its companion serializer (e.g., SN65LV1023A). When SYNC1 or SYNC2 is asserted, the serializer sends 1026-cycle SYNC patterns, enabling the SN65LV1224BMDBREP to lock within a guaranteed timeframe. This avoids the variable lock delay inherent in random-data lock mode and is critical for time-deterministic avionics systems.

What is the role of the LOCK pin on the SN65LV1224BMDBREP?

The LOCK pin on the SN65LV1224BMDBREP is an active-low open-drain output indicating PLL lock status. It goes low only after the deserializer confirms four consecutive identical data boundaries (start/stop bits), ensuring true synchronization-not false lock due to repetitive patterns. While LOCK is high, ROUT0–ROUT9 and RCLK are invalid or high-impedance. System firmware must monitor LOCK to validate data integrity before reading SN65LV1224BMDBREP outputs.

Can the SN65LV1224BMDBREP operate without an external REFCLK?

No, the SN65LV1224BMDBREP requires an external 10–66 MHz REFCLK applied to its REFCLK pin for PLL initialization and stable operation. Unlike some self-clocked receivers, it does not derive timing solely from the incoming LVDS data stream. The REFCLK serves as a frequency reference to stabilize the PLL during lock acquisition and maintain jitter performance. Omitting REFCLK prevents proper initialization and results in persistent LOCK high assertion.

What is the purpose of the REN pin on the SN65LV1224BMDBREP?

The REN (Receiver Enable) pin on the SN65LV1224BMDBREP controls the high-impedance state of the parallel outputs (ROUT0–ROUT9) and RCLK while preserving PLL lock. When REN is driven low, these outputs enter 3-state mode without disrupting the internal PLL or requiring resynchronization. This enables dynamic bus sharing, hot-swap capability, and power-gating of downstream logic without affecting the SN65LV1224BMDBREP's link state or lock timing.