NXP Semiconductors MPC962308D-1H

Overview

MPC962308D-1H from Freescale Semiconductor is a 3.3 V LVCMOS zero-delay clock buffer with 1:8 fanout, internal PLL, and external feedback path for phase-aligned distribution in high-performance computing and telecom systems. It delivers reference-frequency outputs with <250 ps input-to-output skew, <200 ps output-to-output skew, and supports 10–133 MHz operation in industrial temperature range (–40°C to +85°C).

For engineers reviewing the MPC962308D-1H datasheet, MPC962308D-1H pinout, MPC962308D-1H application, or MPC962308D-1H equivalent, key selection criteria include its high-drive capability (faster rise/fall times vs. -1), tristate control per bank, spread-spectrum compatibility, and SOIC-16 package suitability for clock tree distribution in PC, workstation, and datacom backplanes.

Technical Context

The MPC962308D-1H implements a PLL-based zero-delay architecture where the REF input locks to the FBK feedback signal, minimizing static phase offset (±250 ps) and enabling near-zero propagation delay. Its dual-bank (A/B) output structure allows independent tristate control via S1/S2 inputs, supporting system-level test modes and power-down states with <25 µA supply current when REF is inactive.

Unlike standard buffers, it requires no external loop filter components and accepts 5 V-tolerant REF input while driving terminated 50 Ω transmission lines on the incident edge. Output frequency fidelity depends on feedback source selection per configuration - for MPC962308D-1H, Bank A or B feedback reproduces the reference frequency with enhanced drive strength.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (Case 751B-05), 150-mil width, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY2308ZC and MPC962308D-1, the MPC962308D-1H provides superior high-frequency performance (133 MHz), lower jitter (100 ps @133 MHz), and faster edge transitions - making it optimal for next-generation datacom and workstation clock trees demanding tighter timing margins.

Availability

MPC962308D-1H is available at Aetrix Electronics and suitable for PC motherboard design, datacom line card development, and industrial control system integration requiring stable component supply and long-term lifecycle support.

Supply support for MPC962308D-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) was a leading designer of high-performance analog and mixed-signal timing solutions for computing, networking, and industrial markets.

The MPC962308 product line delivers zero-delay clock distribution for high-speed digital systems, targeting applications where deterministic phase alignment, low skew, and robust industrial operation are mandatory.

FAQ

What is the maximum supported input frequency for the MPC962308D-1H?

The MPC962308D-1H supports an input clock frequency range of 10 MHz to 133 MHz under specified load conditions (15 pF for ≥100 MHz). This upper limit is enabled by its high-drive output stage and optimized PLL loop response, distinguishing it from standard variants like MPC962308D-1 which are rated to 100 MHz. The 133 MHz capability makes MPC962308D-1H suitable for DDR2 memory interfaces and high-speed serial link reference clocks.

Does the MPC962308D-1H require external passive components for PLL operation?

No, the MPC962308D-1H requires no external passive components for PLL operation. Its fully integrated PLL uses the FBK pin connected directly to one of its own outputs to close the feedback loop, eliminating the need for external capacitors or resistors. This simplifies board layout and improves reliability compared to discrete PLL implementations. All biasing and loop filtering are handled internally, as confirmed in the Functional Description section of the Freescale datasheet for MPC962308D-1H.

How does the MPC962308D-1H achieve zero input-to-output propagation delay?

The MPC962308D-1H achieves near-zero input-to-output propagation delay through a PLL-based architecture that locks the output clock phase to the REF input using an external feedback path. When the FBK pin is connected to an output, the PLL adjusts the output phase until the delay from REF to FBK equals the internal delay of the feedback path - effectively canceling propagation delay. The datasheet specifies input-to-output skew <250 ps, confirming deterministic phase alignment rather than literal zero delay. This behavior is intrinsic to MPC962308D-1H's design and requires proper FBK routing.

Can the MPC962308D-1H drive 50 Ω transmission lines directly?

Yes, the MPC962308D-1H is designed to drive terminated 50 Ω transmission lines on the incident edge. Its high-drive LVCMOS outputs deliver 12 mA sink/source current, enabling clean signal edges into 50 Ω loads without external series termination. This capability is explicitly stated in the datasheet's "Functional Description" and verified by rise/fall time specs (1.5 ns / 1.25 ns @30 pF), which meet requirements for point-to-point clock distribution on controlled-impedance PCB traces. For MPC962308D-1H, this eliminates need for external drivers in most backplane and motherboard applications.

What is the purpose of the S1 and S2 pins on the MPC962308D-1H?

The S1 and S2 pins on the MPC962308D-1H are select inputs that control output bank sourcing and tristate states. As defined in Table 1 of the datasheet, they determine whether Bank A and/or Bank B outputs are driven by the PLL, bypassed to REF, or placed in high-impedance mode. For example, S2=0/S1=0 places both banks in tristate - useful for power-down or testing. These pins enable dynamic clock gating and system-level diagnostics without requiring external logic, making MPC962308D-1H adaptable to varying board-level timing architectures.