Cypress Semiconductor Corp CY7C9235A-270JXC

Overview

CY7C9235A-270JXC from Cypress Semiconductor is a dual-mode SMPTE-259M/DVB-ASI scrambler and controller IC that performs TRS detection, ×9+×4+1 scrambling, NRZI encoding, and DVB-ASI multiplexing at 27 MHz character rate (270 Mbps serial). It interfaces directly with CY7B9234 HOTLink serializer, supports 8-/10-bit parallel input, and operates from a single +5V supply in 44-pin PLCC package for broadcast video infrastructure.

For engineers reviewing the CY7C9235A-270JXC datasheet, CY7C9235A-270JXC pinout, CY7C9235A-270JXC application, or CY7C9235A-270JXC equivalent, key selection considerations include SMPTE/DVB mode switching via DVB_EN, bypass control of scrambler/NRZI encoder, TRS filtering behavior, and direct compatibility with CY7B9234 serializer timing and signal mapping.

Technical Context

The CY7C9235A implements a parallel linear-feedback shift register for SMPTE-259M scrambling using the ×9 + ×4 + 1 polynomial and a dedicated NRZ-to-NRZI encoder to increase transition density and reduce DC bias in serial streams. Its TRS detector identifies reserved 10-bit patterns (0x000–0x003, 0x3FC–0x3FF) and asserts TRS_DET for one clock cycle.

In DVB-ASI mode (DVB_EN = LOW), the device disables scrambling and NRZI encoding, routes PD0–PD9 directly to Q0–Q9, and uses ENA/ENN to gate data flow while generating K28.5 fill characters via CY7B9234 when no valid data is present. SVS_EN and SC/D_EN enable violation symbol and control character insertion respectively.

Key Specifications

Pinout & Package

Package: 44-pin Plastic Leaded Chip Carrier (PLCC), surface-mount, JEDEC standard footprint with internal lead frame and plastic body. Thermal resistance θ_JA = 55°C/W typical.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SMPTE/DVB encoding applications.

Compared with LMH0303SQ/NOPB and MAX9526ETL+, the CY7C9235A-270JXC uniquely supports dual-standard encoding with hardware-selectable bypass, TRS-aware filtering, and direct CY7B9234 interfacing-making it irreplaceable in professional broadcast systems requiring protocol agility and SMPTE compliance verification.

Availability

CY7C9235A-270JXC is available at Aetrix Electronics and suitable for SD/HD broadcast encoders, professional video routers, and DVB-ASI transport stream generators requiring stable component supply across extended product lifecycles.

Supply support for CY7C9235A-270JXC 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip solutions, memory, and interface ICs for industrial, automotive, and communications markets.

The CY7C9235A belongs to Cypress's broadcast video interface product line, designed specifically to simplify SMPTE-259M and DVB-ASI compliance in professional video equipment without requiring custom FPGA logic or discrete encoder implementations.

FAQ

What is the function of the TRS_FILT pin?

The TRS_FILT pin configures internal filtering of TRS (Timing Reference Signal) characters. When LOW, it forces the lower two bits of detected 10-bit TRS patterns (0x000–0x003, 0x3FC–0x3FF) to match the upper eight bits-ensuring correct 10-bit TRS ID generation even when fed 8-bit video streams. When HIGH, TRS characters pass unmodified to the scrambler.

Can CY7C9235A-270JXC operate without CY7B9234?

No-it is not a standalone serializer. The CY7C9235A generates parallel-encoded 10-bit words (Q0–Q9) but lacks serial output drivers or clock multiplication. It must be paired with CY7B9234 (or compatible HOTLink serializer) to produce SMPTE-259M or DVB-ASI compliant serial streams; its outputs map directly to CY7B9234's Dj, D7–D0, Da, and SVS inputs.

How does DVB_EN affect the BYPASS function?

DVB_EN disables BYPASS functionality entirely. When DVB_EN is LOW (DVB-ASI mode), the scrambler and NRZI encoder are inherently bypassed regardless of BYPASS pin state. BYPASS only controls encoding path selection in SMPTE-259M mode (DVB_EN = HIGH), allowing raw data to skip scrambling and NRZI conversion.

What happens to Q9 and Q0 when SVS_EN or SC/D_EN are inactive?

When SVS_EN is LOW in DVB mode, Q9 is forced LOW regardless of PD9 state-suppressing violation symbol generation. When SC/D_EN is LOW in DVB mode, Q0 is forced LOW-ensuring only data characters (not control symbols) are output. Both pins default to zero output in their inactive states to prevent unintended command character transmission.