NXP Semiconductors MPC9993FA

Overview

MPC9993FA from Freescale Semiconductor is an Intelligent Dynamic Clock Switch (IDCS) PLL clock driver for redundant clock tree systems. It accepts two differential LVPECL inputs (CLK0/CLK1), generates five LVPECL outputs-two 1× (Qa0–Qa1) and three 2× (Qb0–Qb2)-with phase-aligned frequency multiplication, and operates at 3.3 V in a 32-lead LQFP package. Used in telecom line cards requiring failover-capable timing.

For engineers reviewing the MPC9993FA datasheet, MPC9993FA pinout, MPC9993FA application, or MPC9993FA equivalent, key selection criteria include input failure detection latency, static phase offset (±2.0 ns), output skew (50 ps intra-group), 800–1600 MHz VCO range, and LVCMOS control compatibility with manual override and alarm reset functions.

Technical Context

The MPC9993FA implements a fully integrated PLL with ÷8 and ÷16 feedback dividers, enabling 1× and 2× output generation from a single VCO core. Its IDCS logic continuously monitors both LVPECL inputs against Ext_FB, latching Inp0bad/Inp1bad on stuck-H/L detection (>1 period), then switching reference clocks with minimal phase disturbance.

Control is executed via five LVCMOS inputs-Sel_Clk, Manual_Override, PLL_En, MR, and Alarm_Reset-with internal 50 kΩ pull-up/down resistors. Outputs include three status flags (Clk_Selected, Inp0bad, Inp1bad) and five differential LVPECL clock pairs, all terminated to VTT = VCC – 2 V.

Key Specifications

Pinout & Package

Package: 32-lead LQFP (Case 873A-04), lead-free compatible, 7 mm × 7 mm body, 0.8 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PLL clock driver applications.

Compared with ICS853S01I and PI6C59xxxx Series, the MPC9993FA uniquely integrates autonomous dual-input monitoring, latched fault reporting, and phase-bump-free switching-making it irreplaceable in carrier-grade telecom and high-availability computing where hardware-level clock resilience is mandatory.

Availability

MPC9993FA is available at Aetrix Electronics and suitable for SONET/SDH line cards, redundant server clocking, and industrial PLC timing modules requiring stable component supply across extended product lifecycles.

Supply support for MPC9993FA 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 was a global leader in embedded processing and analog solutions, later acquired by NXP Semiconductors in 2015. Its clock products emphasized high-reliability, low-jitter timing for telecom infrastructure.

The MPC9993FA belongs to Freescale's Advanced Clock Drivers family, designed specifically for carrier-class redundant clock distribution with hardware-enforced failover and deterministic phase behavior.

FAQ

What is the function of the Ext_FB pins on the MPC9993FA?

The Ext_FB and Ext_FB pins on the MPC9993FA form a differential LVPECL feedback path that closes the PLL loop. This signal determines the VCO lock point and sets the division ratio (÷8 or ÷16) used to generate the 1× and 2× outputs. Proper termination to VTT = VCC – 2 V is required to meet AC specifications including static phase offset and jitter.

How does the MPC9993FA handle clock failure detection and switching?

The MPC9993FA detects clock failure by monitoring CLK0/CLK1 against Ext_FB; if either input remains stuck HIGH or LOW for ≥1 Ext_FB period, its corresponding Inp0bad or Inp1bad flag latches HIGH. When enabled, IDCS switches to the good clock and slews the PLL to align phase within one Ext_FB cycle-eliminating the typical phase bump seen in non-intelligent clock switches.

Can the MPC9993FA generate both 1× and 2× outputs simultaneously?

Yes, the MPC9993FA generates two 1× differential LVPECL output pairs (Qa0/Qa1) and three 2× differential LVPECL output pairs (Qb0/Qb1/Qb2) simultaneously from a single PLL core. All outputs are phase-aligned, with Qb outputs precisely 0° offset relative to their corresponding Qa outputs-enabling synchronous sampling and data capture across multiple clock domains.

What is the purpose of the Manual_Override pin on the MPC9993FA?

The Manual_Override pin on the MPC9993FA disables the Intelligent Dynamic Clock Switch logic when driven HIGH. In this mode, clock selection follows Sel_Clk exclusively (no automatic failover), but status flags (Inp0bad/Inp1bad) remain active. This allows deterministic clock control during system bring-up, diagnostics, or when external supervision is preferred over autonomous switching.

Does the MPC9993FA support hot-plug operation in backplane systems?

Yes, the MPC9993FA supports hot-plug operation when used with 100 Ω series resistors on all LVPECL inputs (CLK0, CLK1, Ext_FB). This limits current flow from powered-up drivers into unpowered VCC pins during card insertion, preventing latch-up or damage. The design complies with PECL hot-insertion guidelines specified in the Freescale application note for the MPC9993FA.