MPC962308D-1

Overview

The MPC962308D-1 is a 3.3 V zero-delay buffer designed for high-speed clock distribution in PC, workstation, datacom, and telecom applications. It utilizes an internal PLL with an external feedback path to lock the output phase to the reference clock, achieving virtually zero propagation delay. The device provides eight LVCMOS outputs organized into two banks of four. Input-to-output skew is guaranteed at less than 250 ps, while output-to-output skew is under 200 ps. It supports clock frequencies from 10 MHz to 133 MHz and operates on a single 3.3 V supply within an ambient temperature range of –40 °C to +85°C.

Feature Summary

• Zero input-output propagation delay achieved via internal PLL and external feedback loop
• Low-skew performance with maximum 200 ps output-to-output skew and 700 ps device-to-device skew
• Two independent banks of four LVCMOS outputs with tristate control via select inputs S1 and S2
• Spread spectrum compatible and fully 3.3 V compatible without requiring external PLL components

Applications

• High-speed clock distribution in personal computers and workstations
• Clock buffering in data communication equipment
• Telecommunications systems requiring low-jitter timing solutions
• Systems needing multiple synchronized clock domains from a single reference

Procurement Notes

Verify the specific suffix (e.g., D for SOIC or DT for TSSOP) and revision level against current manufacturer documentation. Confirm that the component meets the required industrial temperature range of –40 °C to +85°C for the intended application environment. Ensure compatibility with existing PCB footprints for the selected package type.

Selection Notes

Select the MPC962308D-1 when a 1:8 ratio with identical frequency multiplication is required. Consider the -1H variant if faster rise and fall times are necessary for higher frequency integrity. Verify load capacitance requirements, as the maximum supported frequency decreases from 133 MHz to 100 MHz if the load exceeds 15 pF. Ensure the design accommodates the 3.3 V supply voltage constraints.

Part Context

Originally manufactured by Motorola Semiconductor, this part was later managed by Freescale Semiconductor following corporate restructuring. The datasheet indicates it is functionally compatible with the Cypress CY2308 and CY23S08 devices. The MPC962308 series includes variants with different frequency division ratios, such as the -2, -3, -4, and -5H models, which offer 2X, 4X, or REF/2 outputs depending on the feedback configuration.

Replacement Considerations

The datasheet explicitly states compatibility with the CY2308 and CY23S08. These devices may serve as direct pin-compatible replacements if their electrical specifications align with the system's jitter and skew requirements.

FAQ

How is zero propagation delay achieved in the MPC962308D-1?

Zero delay is achieved by using an internal Phase-Locked Loop (PLL) combined with an external feedback path. This configuration locks the phase of the clock output to the reference clock phase, effectively eliminating propagation delay.

What is the maximum operating frequency for the MPC962308D-1?

The device supports a clock I/O frequency range of 10 MHz to 133 MHz. However, the maximum frequency is dependent on the load capacitance; it is limited to 100 MHz if the load capacitance is 30 pF, and up to 133 MHz if the load is 15 pF or less.

Can the outputs be controlled independently?

Yes, the eight outputs are divided into two banks of four. Each bank can be tristated or driven based on the logic levels of the select inputs S1 and S2, allowing for flexible configuration and power-down states.