CY7B951-SXCT

Overview

The CY7B951-SXCT is a Local Area Network ATM Transceiver manufactured by Infineon Technologies, originally designed by Cypress Semiconductor. It operates in a 24-lead SOIC package and supports SONET/SDH and ATM applications. The device recovers clock and data from 51.84-MHz or 155.52-MHz NRZ/NRZI serial streams using an embedded PLL. It features a single +5V supply, low operating current under 65 mA, and ECL 100K compatible I/O. The component includes loopback testing capabilities, link status indication, and power-down options to minimize crosstalk.

Feature Summary

• Integrated clock and data recovery for 51.84-MHz and 155.52-MHz data streams
• Built-in line receiver inputs eliminating the need for external buffering
• Differential output buffering for transmit side system requirements
• Link Status Indication and Loopback testing functionality

Applications

• Local Area Network ATM applications
• SONET/SDH physical layer protocol engines
• Data mover systems operating at specified frequencies

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment against the 24-lead SOIC specification. Review datasheet revision history for any functional updates. Ensure environmental compliance documentation matches project requirements. Validate electrical characteristics against specific operating temperature ranges before integration.

Selection Notes

Select this component for designs requiring integrated clock recovery without external PLL components. Consider the MODE pin configuration for frequency range selection between 51.84 MHz and 155.52 MHz. Evaluate power consumption requirements as the device offers multiple power-down modes. Verify interface compatibility with PECL signaling levels and ECL 100K outputs. Assess thermal management needs based on the specified operating current limits.

Part Context

This transceiver belongs to the family of ATM and SONET/SDH interface devices. It is functionally compatible with PMC-Sierra PM5345 SUNI interfaces. The device integrates both receive clock recovery and transmit data buffering functions into a single chip. It replaces discrete solutions previously required for clock regeneration and signal conditioning in high-speed serial communication links.

Replacement Considerations

Check for updated lead-free variants within the same product family if environmental regulations require specific material compositions. Verify pin-to-pin compatibility when substituting with other ATM transceivers. Ensure that replacement devices support the same frequency agility and reference clock multiplication ratios.