Texas Instruments CLC031VEC

Overview

CLC031VEC from National Semiconductor is a SMPTE 292M/259M digital video deserializer/descrambler IC that converts 1.485 Gbps HD or 270 Mbps SD serial component video into synchronized 20-bit or 10-bit parallel data with integrated video and ancillary data FIFOs. It performs clock/data recovery, NRZI-to-NRZ conversion, CRC/EDH checking, automatic format detection, and LSB de-dithering - deployed in broadcast-grade video routers, standards converters, and digital video test equipment.

For engineers reviewing the CLC031VEC datasheet, CLC031VEC pinout, CLC031VEC application, or CLC031VEC equivalent, key selection considerations include its dual-voltage operation (3.3 V I/O / 2.5 V core), auto-detecting multi-rate support (270 Mbps–1.485 Gbps), 64-pin TQFP package, built-in BIST/TPG for production test, and flexible multi-function I/O port for real-time register access.

Technical Context

The CLC031VEC implements a CDR-based architecture with independent PLL lock for serial input rates up to 1.485 Gbps, achieving <500 µs VCO lock time. Its descrambler uses the X⁹+X⁴+1 polynomial per SMPTE 259M/292M and supports TRS character alignment, LSB-clipping per ITU-R BT.601, and format detection across SMPTE 125M, 267M, 274M, and 296M rasters.

It integrates two independent data paths: a 20-bit/10-bit parallel video path with adjustable 4-deep FIFO and a 10-bit ancillary/control port supporting read/write register access and packetized ancillary data extraction via maskable ID filtering. The multi-function I/O port maps register bits to physical pins for real-time status monitoring or control without software overhead.

Key Specifications

Pinout & Package

CLC031VEC is housed in a 64-pin Thin Quad Flat Package (TQFP) with NS package number VEC-64A, measuring 10 mm × 10 mm × 1.4 mm, lead pitch 0.5 mm, and exposed thermal pad for enhanced thermal dissipation (θ_JA = 40.1°C/W at 0 LFM airflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CLC031VEC, GS2971-IBE3 offers higher data rate support but removes integrated test capability and dual-supply noise isolation, while LMH0384SQ/NOPB simplifies power design at the expense of format adaptability and ancillary data handling - making CLC031VEC uniquely suited for legacy broadcast infrastructure requiring robust diagnostics and multi-standard interoperability.

Availability

CLC031VEC is available at Aetrix Electronics and suitable for broadcast video routing, standards conversion, and digital video test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for professional AV systems.

Supply support for CLC031VEC 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

National Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by Texas Instruments in 2011; its broadcast video portfolio emphasized SMPTE-compliant signal integrity and system-level integration.

The CLC031VEC belongs to National's professional video interface product line, designed specifically for broadcast infrastructure applications demanding SMPTE 259M/292M compliance, real-time format adaptation, and embedded diagnostics - not general-purpose deserialization.

FAQ

What video standards does the CLC031VEC support?

The CLC031VEC supports SMPTE 259M (270/360 Mbps), SMPTE 344M (540 Mbps), and SMPTE 292M (1.483/1.485 Gbps) serial digital video standards. It auto-detects incoming format and configures parallel output width (10-bit for SD, 20-bit for HD), clock frequency (27–74.25 MHz), and EDH/CRC handling accordingly. CLC031VEC does not support SMPTE 424M (3G-SDI) or later standards.

Does the CLC031VEC require an external crystal or can it use a clock oscillator?

The CLC031VEC accepts either a 27 MHz fundamental-mode crystal (XTALi/XTALo) or a 27 MHz CMOS clock oscillator as its reference source. The device tolerates ±100 ppm frequency deviation and includes internal load capacitance for crystal operation. CLC031VEC does not support VCXO or temperature-compensated references - only fixed-frequency 27 MHz sources.

How is ancillary data extracted and managed in the CLC031VEC?

The CLC031VEC recovers ancillary data from horizontal/vertical blanking intervals per SMPTE 291M and stores it in a 259-word on-chip FIFO. Extraction is controlled by programmable mask and ID bits in configuration registers. Status flags (ANC FIFO Empty/Full/Overrun) and a 10-bit AD[9:0] port allow host systems to read packets without interrupt overhead. CLC031VEC does not extract EDH flags into the FIFO - only user data and checksums.

What is the purpose of the multi-function I/O port on the CLC031VEC?

The CLC031VEC's 8-bit multi-function I/O port (IO[7:0]) provides direct hardware access to register bits such as CRC error status, lock detect, format ID, or EDH flags - configurable per pin via I/O Pin Config registers. This enables real-time monitoring or control without software polling. CLC031VEC does not support GPIO-style general-purpose use; each pin maps exclusively to predefined register functions.

Can the CLC031VEC operate with only a 3.3 V supply?

No. The CLC031VEC requires two independent supplies: +3.3 V for I/O circuits (VDDIO/VDDSI) and +2.5 V for core logic and PLL (VDDD/VDDPLL). Applying only 3.3 V to all rails will cause functional failure and potential damage. Power sequencing must observe VDDPLL ramp before VDDIO, and decoupling capacitors must be placed per the recommended layout in DS200201.