CY7B951-SXC

Overview

The CY7B951-SXC is a Local Area Network ATM Transceiver manufactured by Cypress Semiconductor Corp. It supports SONET/SDH and ATM applications, recovering clock and data from 51.84-MHz or 155.52-MHz serial streams. The device features a single +5V supply, operates within a commercial temperature range of 0°C to 70°C, and utilizes a 24-lead Pb-Free Molded SOIC package (SZ24.3). Key electrical parameters include a reference frequency range of 6.41–6.55 MHz (MODE=LOW) or 19.24–19.64 MHz (MODE=HIGH), with output rise/fall times between 0.4 ns and 1.2 ns. Static operating current is specified at 30 mA maximum.

Feature Summary

• Integrated clock and data recovery for 51.84-MHz and 155.52-Mbps data streams without external buffering
• Built-in transmit PLL multiplies byte-rate reference clocks to generate bit-rate transmit clocks
• Link Fault Indicator and Carrier Detect inputs provide status monitoring for signal integrity
• Configurable loopback testing mode for in-system verification of internal logic

Applications

• SONET/SDH and ATM physical layer protocol engines
• Interfaces with SUNI devices such as PMC-Sierra PM5345
• Data mover and Local Area Network applications operating at specified frequencies

Procurement Notes

Verify the specific ordering suffix to confirm the package type and environmental rating. The SXC suffix indicates a Pb-Free Molded SOIC package intended for commercial temperature operation. Ensure compatibility with existing board layouts for the 24-lead SOIC form factor and confirm that the +5V supply requirements align with system power constraints.

Selection Notes

Select this component when designing systems requiring integrated clock recovery and differential buffering for ATM or SONET interfaces. Choose the SXC variant specifically for lead-free manufacturing processes in commercial environments. Consider the MODE pin configuration to determine whether the system requires 51.84-MHz or 155.52-MHz operation based on the available reference clock source.

Part Context

This device belongs to the CY7B951 family of Local Area Network ATM Transceivers. The family includes variants with different environmental ratings and packaging options, such as the standard SC version for commercial use and the SI/SXI versions for industrial temperature ranges. All variants share identical functional specifications regarding clock recovery and data transmission capabilities.

Replacement Considerations

Public confirmed substitutes include CY7B951-SC for standard commercial packages and CY7B951-SXI for industrial temperature Pb-Free packages. Verify pinout compatibility and electrical characteristics before substitution.