MC100EP142FAG

Shift Registers Overview

The MC100EP142FAG is a 9-bit shift register from the onsemi 100E series, designed for byte-parity applications. It supports serial/parallel data input and serial/parallel output with unidirectional shifting capability. The device operates in PECL mode (VCC = 3.0 V to 5.5 V, VEE = 0 V) or NECL mode (VCC = 0 V, VEE = -3.0 V to -5.5 V). It features dual differential clocks (CLK0, CLK1), asynchronous master reset, and temperature compensation. The component is housed in a lead-free LQFP-32 package.

Shift Registers Feature Summary

• Supports SHIFT and LOAD modes via SEL pin, with data shifting from Bit 0 to Bit 8 on positive clock edges.
• Includes asynchronous Master Reset (MR) that overrides clock inputs to zero all registers.
• Features open input default state and safety clamps on inputs for enhanced reliability.
• Outputs QT0:8 do not require termination for basic shift operation functionality.

Shift Registers Applications

• Byte-parity generation and checking circuits
• High-speed serial-to-parallel data conversion
• Parallel-to-serial data serialization
• ECL-based digital signal processing pipelines

Shift Registers Procurement Notes

Verify the specific ordering suffix 'FA' corresponds to the LQFP-32 package configuration as defined in the manufacturer's documentation. Confirm RoHS compliance status and Pb-Free designation requirements for the target assembly process. Ensure voltage supply rails match the specified PECL or NECL operating ranges to prevent device malfunction.

Shift Registers Selection Notes

Select this component when a 9-bit ECL shift register with dual-clock support is required for byte-oriented data handling. Consider the LQFP-32 package constraints for thermal management and PCB layout. Evaluate the need for asynchronous reset and unidirectional shifting against alternative logic families if lower power consumption is critical.

Shift Registers Part Context

This part belongs to the MC10EP/100EP142 family of high-speed ECL shift registers. The '100' prefix indicates the 100E series variant, which includes temperature compensation compared to the standard 10E series. It is functionally compatible with other devices in the ECLinPS portfolio designed for similar high-frequency logic applications.

Shift Registers Replacement Considerations

MC100EP142MNG is a documented equivalent offering the same logical function in a QFN-32 package.

Shift Registers FAQ

How does the SEL pin control the device operation?

The SEL pin switches between SHIFT and LOAD modes. When SEL is low, parallel data inputs are loaded into the registers. When SEL is high, the device shifts data serially from Bit 0 to Bit 8 on the positive clock edge.

What is the effect of the Master Reset (MR) pin?

A HIGH signal on the MR pin asynchronously resets all nine registers to zero. This action overrides the CLK0 and CLK1 inputs immediately.

Are the outputs required to be terminated?

No, the QT0:8 outputs do not need to be terminated for the shift operation to function correctly. However, leaving unused Q outputs unterminated helps minimize power consumption.