Cypress Semiconductor Corp CY7B9234-270JXC

Overview

CY7B9234-270JXC from Cypress Semiconductor is an SMPTE HOTLink® transmitter IC compliant with SMPTE-259M-CD, DVB-ASI, and Fibre Channel standards. It performs 8B/10B encoding or bypasses encoding, delivers triple PECL 100K serial outputs at 270 Mbps, operates on a single +5V supply, and integrates PLL clock generation without external components - enabling uncompressed SD-SDI video transmission over fiber, coax, or twisted pair in broadcast infrastructure.

For engineers reviewing the CY7B9234-270JXC datasheet, CY7B9234-270JXC pinout, CY7B9234-270JXC application, or CY7B9234-270JXC equivalent, key selection criteria include SMPTE-259M-CD compliance, 270 Mbps serial data rate, TTL-synchronous parallel interface, built-in BIST capability, and PLCC-28 packaging for legacy broadcast equipment design and repair.

Technical Context

The CY7B9234-270JXC implements a fully integrated transmitter architecture with a byte-rate input clock (CKW), parallel 8-bit TTL data path (D0–D7), and three differential PECL serial outputs (OUTA±, OUTB±, OUTC±). Its internal PLL multiplies CKW to generate the 2.7 GHz bit clock required for 270 Mbps operation (10× byte rate).

Encoding mode is selected via the MODE pin: grounded for 8B/10B encoding, VCC for unencoded 10-bit pass-through (Da–Dj), or floating for factory test mode where OUTA+/OUTB+ serve as differential bit clock outputs. The FOTO pin enables optical transmitter shutdown without disrupting OUTC± loopback diagnostics.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 11.43 mm, JEDEC MS-026AC, lead-free compatible (per Rev. *B datasheet).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SMPTE-259M transmitter applications.

Compared with LMH0303SQ/NOPB and GS2971-IBE3, the CY7B9234-270JXC provides guaranteed SMPTE-259M-CD compliance, triple PECL outputs in PLCC-28, and hardware BIST - making it uniquely suited for field-replaceable SD-SDI modules requiring legacy form factor and broadcast certification.

Availability

CY7B9234-270JXC is available at Aetrix Electronics and suitable for SD-SDI video routers, broadcast recorders, and studio monitor distribution hubs requiring stable component supply and long-term obsolescence management.

Supply support for CY7B9234-270JXC 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, memory, and interface solutions for industrial, automotive, and communications markets.

The CY7B9234 belongs to Cypress's SMPTE HOTLink® chipset family, designed specifically to enable cost-effective, standards-compliant serial video transport in broadcast equipment where reliability, interoperability, and long-lifecycle support are critical.

FAQ

Is CY7B9234-270JXC pin-compatible with CY7B9234-360JXC?

No. While both share the same PLCC-28 package and functional pinout, the -270JXC is trimmed and tested for 270 Mbps operation only, whereas the -360JXC supports 360 Mbps. Using the -270JXC at 360 Mbps violates AC timing specifications and may cause bit errors or PLL unlock.

Can CY7B9234-270JXC operate without an external crystal?

No. CKW must be driven by a stable, low-jitter crystal-referenced clock source (e.g., 27 MHz ±100 ppm). The internal PLL requires this precise byte-rate reference to generate the 2.7 GHz serial clock; RC oscillators or system clocks introduce excessive jitter and violate SMPTE-259M eye diagram requirements.

What is the function of the RP pin, and how is it timed?

RP is a TTL-level, 60% duty-cycle byte-rate pulse synchronized to CKW edges when ENA is active. It asserts LOW for one byte period per cycle and is intended for direct connection to CY7C42X FIFO read clocks. In BIST mode, RP pulses only on the final byte of each test loop.

Does CY7B9234-270JXC support DVB-ASI mode with automatic 8B/10B encoding?

Yes. When MODE = GND and SC/D = HIGH on CKW rise, the device encodes D0–D7 as DVB-ASI control characters (e.g., K28.5). The encoder is fully compliant with ETSI EN 300 429 Annex A, supporting both data and special character transmission without external logic.