MC145170D2R2

Clock Generators, PLLs, Frequency Synthesizers Overview

The MC145170D2R2 is a single-chip PLL frequency synthesizer designed for direct use in MF, HF, and VHF bands. It features fully programmable R and N counters, an on-chip reference oscillator amplifier, and dual phase detectors with linear transfer functions. The device supports serial configuration via BitGrabber registers, eliminating the need for address bits. Operating voltage ranges from 2.7 V to 5.5 V, with maximum operating frequencies up to 185 MHz at 5.0 V supply. Quiescent supply current is limited to 100 µA excluding input amplifier consumption.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• BitGrabber register architecture allows random access to C, N, and R registers without steering bits.
• Jam-load feature initializes N and R counters simultaneously to reduce lock times.
• Configurable C register enables shutdown of unused outputs to minimize noise.
• Dual phase detectors (A and B) provide linear transfer functions without dead zones.

Clock Generators, PLLs, Frequency Synthesizers Applications

• MF, HF, and VHF band frequency synthesis
• Direct interface to Motorola SPI serial data ports
• Spectrum analyzer local oscillator circuits

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the D2 suffix indicates the SOG-16 package variant. Confirm the R2 suffix corresponds to the specific reel or tape packaging configuration provided by the manufacturer. Ensure the component meets the -40°C to +85°C operating temperature range specified for this part number.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this device when a robust power-on reset circuit is required compared to the MC145170-1. Choose the MC145170D2R2 for designs needing pin-for-pin compatibility with previous generations while utilizing the improved POR responsiveness. Ensure the application operates within the 2.7 V to 5.5 V supply range and requires serial programmability.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the MC145170-2 family, which is an enhanced version of the MC145170-1. The primary distinction lies in the more robust power-on reset circuit, which draws approximately 20 µA additional supply current. Both devices share the same silicon die with different mask options for the POR circuit.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

The MC145170-1 is a compatible predecessor but lacks the improved power-on reset circuit. Substitution requires accounting for the slight difference in quiescent current behavior during power transitions. No other functional differences exist between the two variants.