NXP Semiconductors MC145170D2

Overview

MC145170D2 from Freescale Semiconductor is a single-chip PLL frequency synthesizer with serial interface, designed for MF/HF/VHF band RF systems. It features fully programmable R (5–32,767) and N (40–65,535) counters, dual-phase detectors with linear transfer functions, on-chip crystal oscillator support, and a robust power-on reset circuit drawing ≤100 µA quiescent current at 5.5 V. It operates from 2.7 to 5.5 V and supports direct interface to Motorola SPI ports.

For engineers reviewing the MC145170D2 datasheet, MC145170D2 pinout, MC145170D2 application, or MC145170D2 equivalent, this device is selected for RF transceiver tuning, programmable local oscillator design, and low-noise frequency synthesis where jam-load initialization, BitGrabber register architecture, and configurable reference/output control are critical.

Technical Context

The MC145170D2 implements a dual-phase detector architecture-selectable single-ended (PDout) or double-ended (φR/φV)-both eliminating dead zones via patented linear transfer functions. Its 16-bit N and 15-bit R counters feed into phase/frequency detectors limited to 2 MHz input, requiring divide ratios that constrain fR and fV outputs accordingly.

It uses a static 16½-stage shift register with Schmitt-triggered CLK/ENB inputs, enabling DC-to-4 MHz serial clocking. The BitGrabber register system allows random-access 1-, 2-, or 3-byte transfers to C/N/R registers without address bits, while the jam-load feature simultaneously initializes both counters and phase detectors upon N-register update.

Key Specifications

Pinout & Package

SOG-16 package (Case 751B), 16-pin shrink-outline Gull-wing, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PLL frequency synthesizer applications.

Compared with MC145170P2 and MC145170DT2, the MC145170D2 offers the smallest footprint (SOG-16) and best high-frequency stability for RF layouts, while retaining full functional equivalence - making it optimal for space-constrained, high-volume SMT designs.

Availability

MC145170D2 is available at Aetrix Electronics and suitable for FM transceivers, amateur radio equipment, UHF wireless microphones, and industrial remote controls requiring stable component supply across extended temperature ranges (-40 to 85°C).

Supply support for MC145170D2 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) is a global leader in analog and mixed-signal ICs for automotive, industrial, and communications applications.

The MC145170D2 belongs to Freescale's legacy PLL synthesizer product line, engineered specifically for cost-sensitive, high-reliability RF systems requiring minimal external components and deterministic lock behavior.

FAQ

What is the maximum operating frequency supported by the MC145170D2 at 3.0 V supply?

The MC145170D2 supports up to 100 MHz on the fin input at 3.0 V supply voltage, as specified in the Electrical Characteristics table. This value is guaranteed across the full operating temperature range of –40°C to +85°C and assumes a 500 mVpp sine-wave input signal. Operation above this frequency requires ≥4.5 V supply.

Does the MC145170D2 require external passive components for crystal oscillator operation?

Yes, the MC145170D2 requires two external load capacitors (C1 and C2 ≤30 pF each, including stray capacitance) and a 1.0–5.0 MΩ feedback resistor across OSCin/OSCout pins when using a parallel-resonant crystal. These components are mandatory for stable oscillation and are detailed in Figure 11 of the technical data sheet.

How does the jam-load feature improve system reliability in the MC145170D2?

The jam-load feature in the MC145170D2 ensures that both the N and R counters are simultaneously loaded and begin counting down together whenever new data is written to the N register. This prevents mismatched counter states and erroneous phase detector outputs during frequency transitions - directly improving lock consistency and reducing spurious emissions in RF systems using MC145170D2.

Can the MC145170D2 operate with a 1.8 V supply?

No, the MC145170D2 has a minimum operating supply voltage of 2.7 V as specified in Table 1 and Electrical Characteristics. Attempting operation below 2.7 V may result in undefined behavior, failure to initialize, or incomplete register loading - the device is not characterized or guaranteed for 1.8 V use.

What is the purpose of the BitGrabber register architecture in the MC145170D2?

The BitGrabber architecture in the MC145170D2 eliminates the need for address or steering bits in the serial interface by embedding register selection logic directly in the shift register. This allows 1-, 2-, or 3-byte transfers to the C, N, or R registers using only Din, CLK, and ENB - reducing MCU firmware complexity and minimizing serial bus overhead during MC145170D2 configuration.