NXP Semiconductors MPC9893AE

Overview

MPC9893AE from NXP Semiconductors (formerly Freescale) is a 3.3 V/2.5 V compatible, PLL-based intelligent dynamic clock switch and generator for redundant clock distribution systems. It accepts two LVCMOS reference clocks, generates 12 phase-aligned outputs across two banks, detects clock failure, and performs seamless failover with zero-output-interruption slewing. It is used in telecom line cards requiring high-availability timing.

For engineers reviewing the MPC9893AE datasheet, MPC9893AE pinout, MPC9893AE application, or MPC9893AE equivalent, this page delivers verified technical context, bank-specific frequency configuration, IDCS behavior, jitter performance at 400 MHz VCO, and LQFP-48 package-level design guidance - all grounded in Freescale's Rev 5 (06/2005) technical data.

Technical Context

The MPC9893AE implements a fully differential PLL with external feedback (via QFB→FB) to achieve zero-delay operation and eliminate phase bumps during clock failover. Its IDCS logic continuously monitors CLK0 and CLK1, latching ALARM0/ALARM1 on failure and triggering smooth slew-to-alignment without output interruption.

Bank A (QA0–QA5) and Bank B (QB0–QB5) support independent frequency scaling via FSEL[0:3], enabling configurations such as ×8/×4 (M8/M4), ×3/×1.5 (M3/M32), or ÷2 (M12H). Output skew is ≤150 ps within bank and ≤100 ps between banks, with I/O phase jitter as low as 40 ps RMS at FB=4 and fVCO=400 MHz.

Key Specifications

Pinout & Package

Package: 48-lead LQFP (7×7 mm², Pb-free, Case 932-03). Pin 1 marked; thermal pad exposed on bottom (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar intelligent clock switch and generator applications.

Compared with MPC9893AE, ICS853S01I offers lower channel count and no redundancy logic but supports LVDS signaling for longer trace runs, while PI6C557-03 provides EEPROM-based configuration persistence and spread-spectrum capability at the cost of missing real-time failover intelligence - making MPC9893AE uniquely suited for telecom-grade availability requirements.

Availability

MPC9893AE is available at Aetrix Electronics and suitable for telecom infrastructure, network processor timing, industrial Ethernet switching, and redundant server clock distribution requiring stable component supply across long production lifecycles.

Supply support for MPC9893AE 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

NXP Semiconductors acquired Freescale in 2015 and maintains legacy timing product support, including documentation, errata, and long-term supply commitments for industrial and telecom-grade devices.

The MPC9893AE belongs to Freescale's Advanced Clock Drivers family, designed specifically for high-availability, phase-coherent clock distribution in carrier-class networking and telecommunications equipment.

FAQ

What is the function of the QFB and FB pins on the MPC9893AE?

The QFB pin outputs the internal PLL feedback signal and must be connected directly to the FB pin to close the PLL loop. This external feedback path enables zero-delay operation and ensures phase alignment between outputs and the selected reference clock. Without this connection, the MPC9893AE cannot achieve its specified static phase offset (–60 to +50 ps) or maintain lock; the MPC9893AE will not function as intended in normal PLL mode.

How does the MPC9893AE handle clock failure detection and switchover?

The MPC9893AE uses its on-chip Intelligent Dynamic Clock Switch (IDCS) to monitor CLK0 and CLK1 for stuck-high or stuck-low conditions lasting ≥1 input period. Upon detecting failure, it asserts ALARM0 or ALARM1 and slews the PLL output to align with the healthy reference - completing the transition without output interruption. The MPC9893AE guarantees no runt pulses and eliminates typical phase bumps, maintaining continuous timing integrity during failover.

Can the MPC9893AE generate different frequencies on Bank A and Bank B simultaneously?

Yes. Bank A (QA0–QA5) and Bank B (QB0–QB5) can operate at independent frequencies using the FSEL[0:3] control bits. For example, in M32 mode (FSEL=0101), Bank A runs at ×3×fREF while Bank B runs at ×1.5×fREF. This allows the MPC9893AE to drive heterogeneous subsystems - such as a 156.25 MHz SerDes interface (Bank A) and a 78.125 MHz memory controller (Bank B) - from a single 52.083 MHz reference.

What is the purpose of the VCC_PLL pin on the MPC9893AE, and how should it be decoupled?

VCC_PLL supplies the analog PLL core and must be isolated from digital noise. The MPC9893AE datasheet specifies an RC filter: a 9–10 Ω series resistor (RF) and 22 µF bulk capacitor (CF), targeting >40 dB attenuation above 100 kHz. This filtering reduces I/O phase jitter - unfiltered VCC_PLL can increase RMS jitter from 40 ps to >70 ps. The MPC9893AE's performance in telecom applications depends critically on proper VCC_PLL conditioning.

Is the MPC9893AE pin-compatible with other members of the MPC98xx family?

No. The MPC9893AE is not pin-compatible with MPC9892 or MPC9894. While all share the 48-lead LQFP package, pin functions differ significantly - e.g., MPC9892 lacks ALARM outputs and QFB feedback, and MPC9894 adds spread-spectrum control. Substituting without schematic and layout review risks functional failure. The MPC9893AE's specific IDCS, dual-bank, and feedback architecture is unique within the family.