Introduction
The new MC145170-2 is pin-for-pin compatible with the MC145170-1. A comparison of the two parts is shown in the table below. The MC145170-2 is recommended for new designs and has a more robust power-on reset (POR) circuit that is more responsive to momentary power supply interruptions. The two devices are actually the same chip with mask options for the POR circuit. The more robust POR circuit draws approximately 20 µA additional supply current. Note that the maximum specification of 100 µA quiescent supply current has not changed.

• Maximum Operating Frequency:
    185 MHz @ Vin = 500 mVpp, 4.5 V Minimum Supply
    100 MHz @ Vin = 500 mVpp, 3.0 V Minimum Supply
• Operating Supply Current:
    0.6 mA @ 3.0 V, 30 MHz
    1.5 mA @ 3.0 V, 100 MHz
    3.0 mA @ 5.0 V, 50 MHz
    5.8 mA @ 5.0 V, 185 MHz
• Operating Temperature Range: -40 to 85°C
• R Counter Division Range: 1 and 5 to 32,767
• N Counter Division Range: 40 to 65,535
• Direct Interface to Motorola SPI Serial Data Port
• See Application Notes AN1207/D and AN1671/D
• Contact Motorola for MC145170 control software.