NXP Semiconductors PCK953BD/G,128

Overview

PCK953BD/G,128 from NXP Semiconductors is a 3.3 V PLL-based clock driver IC designed for high-performance clock tree distribution. It delivers up to 125 MHz output frequency, 100 ps max output skew, and 55 ps typical cycle-to-cycle jitter, with nine LVCMOS outputs and differential LVPECL reference input - ideal for zero-delay, low-skew fan-out in FPGA and ASIC timing systems.

For engineers reviewing the PCK953BD/G,128 datasheet, PCK953BD/G,128 pinout, PCK953BD/G,128 application, or PCK953BD/G,128 equivalent, this device supports critical timing integrity in telecom infrastructure, high-speed data acquisition, and multi-processor synchronization where deterministic phase alignment and minimal jitter propagation are required.

Technical Context

The PCK953BD/G,128 integrates a fully differential PLL with VCO lock range of 120–500 MHz and selectable divide-by-1/divide-by-2 operation via VCO_SEL. Its architecture eliminates external loop filter components and enables precise feedback control through dedicated FB_CLK and QFB pins.

Control logic includes MR/OE (master reset/output enable) and PLL_EN for dynamic mode selection between PLL-locked and bypass operation, while BYPASS and VCO_SEL pins configure functional behavior without requiring reconfiguration of external circuitry.

Key Specifications

Pinout & Package

Package: LQFP32 (SOT358-1), 7 mm × 7 mm × 1.4 mm body, 32-pin plastic low-profile quad flat package with exposed pad not specified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT5V9885BGI and NB3N502DG, the PCK953BD/G,128 offers superior skew control (100 ps vs ≥150 ps), integrated PLL filtering, and dedicated QFB feedback - making it optimal for applications demanding deterministic phase alignment without external component trade-offs.

Availability

PCK953BD/G,128 is available at Aetrix Electronics and suitable for telecom infrastructure, high-speed data acquisition, and industrial automation requiring stable component supply and long-term lifecycle support.

Supply support for PCK953BD/G,128 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 is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and communications markets.

The PCK953BD/G,128 belongs to NXP's high-performance clock management product line, engineered specifically for low-jitter, zero-delay clock distribution in FPGA, ASIC, and multi-processor timing architectures.

FAQ

What is the maximum output frequency supported by the PCK953BD/G,128 in PLL mode?

The PCK953BD/G,128 supports a maximum output frequency of 125 MHz in PLL mode when VCO_SEL = 0 (divide-by-1). With VCO_SEL = 1 (divide-by-2), the maximum drops to 100 MHz. This specification is confirmed in Table 6 of the official NXP datasheet Rev. 05. The PCK953BD/G,128 achieves this using its internal 200–500 MHz VCO with programmable feedback dividers.

Does the PCK953BD/G,128 require an external loop filter for PLL operation?

No, the PCK953BD/G,128 does not require an external loop filter. Its PLL is fully integrated with on-die compensation, eliminating discrete RC components. This is explicitly stated in the General Description section and verified in Section 11.1 of the NXP datasheet. The PCK953BD/G,128 relies instead on internal charge pump and loop dynamics optimized for zero-delay performance.

How many clock outputs does the PCK953BD/G,128 provide, and what is their electrical standard?

The PCK953BD/G,128 provides nine LVCMOS-compatible clock outputs (Q0–Q7 plus QFB). All outputs deliver rail-to-rail 3.3 V CMOS signals capable of driving terminated 50 Ω transmission lines. QFB is functionally reserved for feedback but electrically identical - confirmed in Pin Description Table 2 and Functional Diagram Figure 1 of the PCK953BD/G,128 datasheet.

What is the purpose of the MR/OE pin on the PCK953BD/G,128?

The MR/OE (Master Reset/Output Enable) pin on the PCK953BD/G,128 is an active-HIGH control that simultaneously resets internal PLL counters and places all nine outputs in high-impedance state. This enables clean power sequencing, fault containment, and hot-swap capability. Its behavior is defined in Table 3 "Function selection" and validated in the Functional Description section of the NXP PCK953BD/G,128 datasheet.

Can the PCK953BD/G,128 operate without a PLL - i.e., in bypass mode?

Yes, the PCK953BD/G,128 supports bypass mode when BYPASS = 0 and PLL_EN = 0. In this configuration, the PECL_CLK input is routed directly to the outputs with minimal propagation delay (5.2 ns typical), preserving input jitter characteristics. This mode is documented in Table 3 and Dynamic Characteristics Table 6 (tpd(bypass)), confirming the PCK953BD/G,128's flexibility for reference forwarding or fallback timing paths.