NXP Semiconductors MPC962308D-1

Overview

MPC962308D-1 from Freescale Semiconductor is a 3.3 V LVCMOS zero-delay clock buffer with 1:8 fanout, internal PLL, and external feedback path to achieve sub-250 ps input-to-output skew. It delivers phase-aligned clock distribution for PC, workstation, and telecom backplanes operating at 10–133 MHz.

For engineers reviewing the MPC962308D-1 datasheet, MPC962308D-1 pinout, MPC962308D-1 application, or MPC962308D-1 equivalent, this device supports tristate control per bank, spread-spectrum compatibility, static phase offset ≤±250 ps, and operates across –40°C to +85°C with 3.3 V single supply.

Technical Context

The MPC962308D-1 implements a PLL-based zero-delay architecture where the REF input drives an internal phase-locked loop, and the FBK pin closes the feedback loop externally to lock output phase to reference. Its dual-bank (A/B) output structure enables independent tristate control via S1/S2 select inputs.

This configuration reproduces the reference frequency identically at all eight outputs (Bank A = REF, Bank B = REF), with guaranteed output-to-output skew <200 ps and device-to-device skew <700 ps. The PLL enters power-down mode when REF has no rising edges, reducing supply current to <25 µA.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (Case 751B-05, 150-mil width). Pin-compatible with CY2308/CY23S08 and suitable for standard 16-SOIC PCB footprints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY2308ZXI and ICS552GI-01LFT, the MPC962308D-1 uniquely combines 5 V-tolerant REF, per-bank tristate, and spread-spectrum compatibility - making it optimal for industrial backplanes and legacy-compatible PC designs where flexibility and EMI control are prioritized over maximum frequency or drive strength.

Availability

MPC962308D-1 is available at Aetrix Electronics and suitable for PC motherboard clock distribution, telecom line card timing, and industrial PLC backplane applications requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for MPC962308D-1 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 and communications infrastructure.

The MPC962308 product line targets high-speed clock distribution in PC, workstation, and telecom systems, emphasizing low skew, zero-delay PLL accuracy, and industrial reliability - directly addressing signal integrity challenges in multi-GHz digital systems.

FAQ

What is the function of the FBK pin on the MPC962308D-1?

The FBK pin on the MPC962308D-1 serves as the PLL feedback input, connecting externally to one of the output clocks (e.g., CLKA1) to close the phase-lock loop. Its capacitive loading directly adjusts the input-to-output propagation delay, enabling fine-tuning of static phase offset within ±250 ps. This external feedback path distinguishes the MPC962308D-1 from internally compensated buffers and is essential for achieving zero-delay operation. The MPC962308D-1 requires this connection to maintain lock and deliver its specified skew performance.

Does the MPC962308D-1 support 5 V input signals?

Yes, the MPC962308D-1 REF input is explicitly 5 V tolerant, allowing direct interface with legacy 5 V crystal oscillators or logic-level clock sources without external level shifters. All other inputs (S1, S2, FBK) operate at 3.3 V logic levels and are not 5 V tolerant. This 5 V tolerance applies only to the REF pin and is confirmed in Table 4 (Maximum Ratings) and Table 5 (Operating Conditions) of the official Freescale datasheet for the MPC962308D-1.

How does the MPC962308D-1 handle power-down mode?

The MPC962308D-1 enters power-down mode automatically when no rising edges are detected on the REF input, reducing supply current to <25 µA. In this state, all outputs go to high-impedance (tristate), and the PLL is disabled. Power-down also activates when S2=0 and S1=0 (per Table 1), or when the PLL loses lock due to invalid FBK signal. Recovery occurs within 1.0 ms after valid REF edges resume, as specified in Table 7 for tLOCK. This behavior is intrinsic to the MPC962308D-1's design and requires no external control signals.

What is the difference between MPC962308D-1 and MPC962308D-1H?

The MPC962308D-1H is a high-drive variant of the MPC962308D-1, delivering faster rise/fall times (1.5 ns vs. 2.5 ns) and higher output current (12 mA vs. 8 mA) while maintaining identical pinout, PLL architecture, and zero-delay functionality. Both share the same reference-frequency replication configuration (REF → REF), but the MPC962308D-1H is optimized for driving heavier capacitive loads or longer traces. The MPC962308D-1 remains preferred for standard 30 pF loads where lower power consumption is prioritized.

Can the MPC962308D-1 be used in spread-spectrum clocking systems?

Yes, the MPC962308D-1 is explicitly designed to be spread-spectrum compatible, as stated in its features list and functional description. Its PLL architecture tolerates frequency modulation on the REF input without losing lock, enabling EMI reduction in dense PCB environments such as PC motherboards and telecom equipment. This capability is validated across the full 10–133 MHz input range and does not require configuration changes - the MPC962308D-1 maintains stable zero-delay operation even with ±0.25% center-spread modulation applied to the reference clock.