DS92LV1212AMSA

Overview

The DS92LV1212AMSA is a 10-bit Bus LVDS deserializer designed to receive serial data streams and transform them into a parallel data bus with an embedded clock recovery mechanism. It operates within a frequency range of 16 MHz to 40 MHz, supporting a maximum serial bandwidth of 400 Mbps at the upper limit. The device features random lock capability, allowing synchronization without specific SYNC patterns, which facilitates hot insertion into running backplanes. It utilizes a single differential pair for input, eliminating multi-channel skew issues common in parallel interfaces. The component includes a powerdown mode to reduce supply current when inactive.

Feature Summary

• Supports random lock initialization and resynchronization without requiring special synchronization patterns from the serializer.
• Integrates an onboard PLL to extract clock information from the incoming serial data stream for accurate data recovery.
• Provides a 10-bit parallel interface compatible with UTOPIA I standards or standard byte plus control bit configurations.
• Features failsafe biasing capabilities to prevent unintentional locking due to noise pickup on disconnected inputs.

Applications

• Hot insertion into operating serial busses without interrupting communication.
• Point-to-point transmission over PCB traces or twisted pair cables.
• Backplane applications requiring reduced cable count and connector size.

Procurement Notes

Verify the datasheet version and revision history before integration, as specifications may evolve. Confirm that the MSA28 package footprint matches your PCB layout requirements. Ensure the design accounts for the recommended operating conditions, specifically the 3.0V to 3.6V supply voltage range and the -40°C to +85°C temperature span. Check for any end-of-life notices or obsolescence status directly from the manufacturer.

Selection Notes

Select this component when a low-power, high-speed serial-to-parallel conversion is required with minimal trace count. It is suitable for systems needing open-loop synchronization or hot-pluggable functionality. Compare against the DS92LV1210 if higher noise margin is not critical, or consider the DS92LV1224 for higher frequency requirements up to 66 MHz. Ensure the paired serializer supports the Bus LVDS protocol.

Part Context

The DS92LV1212AMSA is part of the National Semiconductor (now Texas Instruments) Bus LVDS family. It serves as the receiver counterpart to serializers like the DS92LV1021. This chipset approach reduces the complexity of high-speed parallel interfaces by converting them to a single differential pair. The 'MSA' suffix indicates the 28-lead SSOP package type.

Replacement Considerations

The DS92LV1212A is the direct upgrade to the DS92LV1212, maintaining feature compatibility. For pin-compatible alternatives, consider the DS92LV1210, though it lacks some sensitivity improvements. Verify electrical characteristics and timing parameters against the original design requirements when substituting.

FAQ

How does the random lock mechanism function?

The device can attain lock to a data stream without requiring special SYNC patterns. This allows operation in open-loop applications and supports hot insertion. Lock time varies based on the initial phase relation and data stream characteristics.

What is the purpose of the REFCLK pin?

The REFCLK pin supplies a reference clock signal for the internal PLL frequency. It must be running before the Deserializer powers up to allow proper synchronization to the incoming data stream.

How is false lock prevented?

Circuitry detects repetitive multi-transition (RMT) patterns where more than one Low-High transition occurs in a clock cycle. Upon detection, the LOCK output remains inactive until the pattern changes, preventing the device from locking to data bits instead of the clock.