NXP Semiconductors MPC962305D-1H

Overview

MPC962305D-1H from Freescale Semiconductor is a 3.3 V, 1:5 LVCMOS zero-delay clock buffer with on-chip PLL, designed to distribute high-speed reference clocks with sub-350 ps input-output delay and ≤250 ps output-to-output skew. It accepts one 5 V-tolerant REF input and drives five low-skew LVCMOS outputs, supporting frequencies up to 133 MHz for PCI and CPU clock distribution in industrial embedded systems.

For engineers reviewing the MPC962305D-1H datasheet, MPC962305D-1H pinout, MPC962305D-1H application, or MPC962305D-1H equivalent, key selection criteria include its -1H high-drive variant's 1.5 ns rise/fall time, 200 ps cycle-cycle jitter, 8-pin SOIC package, and PLL-based zero-delay architecture optimized for timing-critical digital backplanes and microprocessor clock trees.

Technical Context

The MPC962305D-1H implements an internal PLL locked to the REF input, with feedback sourced from the CLKOUT pin. Its architecture guarantees zero input-output propagation delay (±350 ps) and maintains phase alignment across all five outputs via on-die matching.

All outputs are LVCMOS-compliant, driven from a single 3.3 V supply, and enter tri-state during PLL shutdown when no rising edge is detected on REF - drawing only 25 µA. The -1H version delivers faster edge rates than the -1 variant, enabling reliable operation at 100–133 MHz under 10 pF load.

Key Specifications

Pinout & Package

Package: 8-pin 150-mil SOIC (Case 751-06), surface-mount, lead-free compatible per Freescale documentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar zero-delay clock buffer applications.

Compared with CY2305SC-1H and ICS552GI-1T, the MPC962305D-1H offers superior 5 V-tolerant input flexibility, tighter 200 ps jitter spec, and faster 1.0 ms PLL lock time - making it preferred for industrial and CPU-adjacent clock distribution where signal integrity and interoperability are critical.

Availability

MPC962305D-1H is available at Aetrix Electronics and suitable for PCI bus clock distribution, CPU clock fanout, and industrial microcontroller clock tree applications requiring stable component supply, long-term industrial temperature support, and guaranteed zero-delay performance.

Supply support for MPC962305D-1H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in automotive, industrial, and networking semiconductors, with deep expertise in timing solutions and mixed-signal IC design.

The MPC962305D-1H belongs to Freescale's TIMING SOLUTIONS product line, engineered specifically for high-fidelity clock distribution in performance-constrained digital systems such as CPU subsystems and PCI-based platforms.

FAQ

What is the maximum operating frequency of the MPC962305D-1H?

The MPC962305D-1H supports an input/output clock frequency range of 10 MHz to 133 MHz. At frequencies above 100 MHz, the specified load capacitance is reduced to 10 pF to maintain signal integrity and meet the 1.5 ns rise/fall time specification. This makes the MPC962305D-1H suitable for high-speed CPU and PCI-X clock distribution where precise edge timing is essential.

Does the MPC962305D-1H require an external crystal or oscillator?

No, the MPC962305D-1H does not require an external crystal. It uses an on-chip PLL that locks directly to the externally supplied reference clock on the REF pin. The device relies entirely on that input signal - no crystal, resonator, or oscillator is needed. This simplifies BOM and eliminates startup delay associated with crystal oscillators, making the MPC962305D-1H ideal for systems requiring immediate clock availability after power-up.

How does the MPC962305D-1H handle power-down conditions?

The MPC962305D-1H automatically enters a low-power shutdown state when no rising edge is detected on the REF input pin. In this mode, all outputs go to high-impedance (tri-state), the PLL is disabled, and supply current drops to ≤25 µA. This behavior is intrinsic to the device's design and requires no external control signals - it is purely event-driven by REF activity, supporting energy-efficient operation in intermittently active systems.

Is the MPC962305D-1H pin-compatible with the standard MPC962305D-1?

Yes, the MPC962305D-1H is pin-compatible and footprint-compatible with the MPC962305D-1. Both use identical 8-pin SOIC packaging (Case 751-06) and share identical pin functions, electrical connections, and DC characteristics. The -1H variant enhances AC performance - specifically rise/fall time and drive strength - without altering pin assignment, allowing drop-in replacement in existing designs targeting higher-frequency operation.

What is the purpose of the CLKOUT pin on the MPC962305D-1H?

The CLKOUT pin on the MPC962305D-1H provides the internal PLL feedback signal and serves as the primary output for closed-loop phase alignment. Its loading directly affects static phase offset between REF and the buffered CLK1–CLK4 outputs. Freescale specifies that adjusting capacitive load on CLKOUT (e.g., 10–30 pF) fine-tunes skew performance - a unique design feature enabling board-level optimization of timing margins without changing the IC.