NXP Semiconductors MC145152DW2R2

Overview

MC145152DW2R2 from Freescale Semiconductor is a CMOS dual-modulus parallel-input PLL frequency synthesizer IC designed for RF local oscillator generation in land mobile radio, cellular, and amateur transceivers. It integrates a 10-bit ÷N counter, 6-bit ÷A counter, selectable-reference divider (÷R = 8–2048), on-chip phase detector (φR/φV), lock detect (LD), and dual-modulus control output (MC). Operates from 3.0–9.0 V at –40°C to +85°C with input frequency support up to 25 MHz.

For engineers reviewing the MC145152DW2R2 datasheet, MC145152DW2R2 pinout, MC145152DW2R2 application, or MC145152DW2R2 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed use cases in VHF/UHF radios, and two rigorously cross-checked alternative synthesizers - all grounded in Freescale's Rev. 5 technical data.

Technical Context

The MC145152DW2R2 implements a dual-modulus prescaler interface architecture where the internal ÷N and ÷A counters jointly generate a programmable total division ratio N_T = N × P + A, enabling fine channel spacing (e.g., 5 kHz or 30 kHz) across wide VCO bands. Its phase detector outputs φR and φV provide rail-to-rail complementary error signals for external loop filtering.

It supports both on-chip crystal oscillator operation (via OSCin/OSCout with parallel-resonant crystal and load capacitors) and external reference injection. The MC output drives an external dual-modulus prescaler (e.g., 64/65), while LD provides active-high lock status - critical for frequency-agile radio control logic.

Key Specifications

Pinout & Package

SOG package (Case 751F), 28-pin shrink small-outline Gull-wing, 0.025" pitch, lead-free compatible per Freescale specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC145152P2 and MC145152DW2, the MC145152DW2R2 offers identical synthesizer functionality in a surface-mount SOG package optimized for automated assembly and space-constrained RF modules, with no trade-offs in frequency range, power, or lock reliability.

Availability

MC145152DW2R2 is available at Aetrix Electronics and suitable for VHF/UHF land mobile radios, 800 MHz cellular base stations, amateur transceivers, and scanning receivers requiring stable component supply and long-term obsolescence management.

Supply support for MC145152DW2R2 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 automotive, industrial, and communications semiconductors, known for high-reliability analog and mixed-signal ICs.

The MC145152DW2R2 belongs to Freescale's legacy CMOS PLL synthesizer family, engineered specifically for cost-effective, low-power frequency synthesis in professional and consumer two-way radios - emphasizing parallel programmability, wide supply range, and robust lock detection.

FAQ

What is the maximum input frequency supported by the MC145152DW2R2 fin pin?

The MC145152DW2R2 supports up to 25 MHz on the fin pin when driven by a dc-coupled CMOS square wave at VDD = 9 V. At VDD = 5 V, the guaranteed maximum is 22 MHz; at VDD = 3 V, it drops to 15 MHz. These limits assume proper ac coupling for sine-wave inputs and account for propagation delay constraints in dual-modulus prescaler interfaces.

Does the MC145152DW2R2 require external pull-up resistors on its N, A, and RA inputs?

No, the MC145152DW2R2 includes internal pull-up resistors on all N0–N9, A0–A5, and RA0–RA2 inputs. This allows direct connection to SPST switches tied to VSS for logic 0, eliminating external pull-up components and simplifying board layout - a key design advantage confirmed in Freescale's Rev. 5 datasheet Section 2.2.1.

How does the MC145152DW2R2 generate its total division ratio in dual-modulus mode?

The MC145152DW2R2 computes total division ratio as N_T = N × P + A, where N is the 10-bit programmed value, A is the 6-bit programmed value, and P is the lower modulus of the external dual-modulus prescaler (e.g., 64). The MC output controls prescaler modulus switching: low during A counts, then high for the remaining N−A counts - directly enabling fine channel resolution without fractional-N complexity.

Can the MC145152DW2R2 operate without an external crystal?

Yes, the MC145152DW2R2 can accept an external reference clock applied to the OSCin pin (with OSCout left unconnected). It supports 10–25 MHz CMOS-level square waves or ac-coupled sine waves. This allows substitution of a TCXO or system clock for improved stability or synchronization - a capability explicitly documented in Section 2.2.1 of the Freescale datasheet.

What is the function of the MC output pin on the MC145152DW2R2?

MC is the dual-modulus prescaler control output on the MC145152DW2R2. It is an active-low signal that starts low, remains low while the ÷A counter decrements, then goes high for the remainder of the ÷N−A count cycle. This precisely sequences the external prescaler's modulus switching (e.g., between ÷64 and ÷65), forming the basis for programmable total division in wideband synthesizer designs.