MC12080 1.1 GHz Prescaler Description The MC12080 is a single modulus divide by 10, 20, 40, 80 prescaler for low power frequency division of a 1.1 GHz high frequency input signal. Divide ratio control inputs SW1, SW2 and SW3 select the required divide ratio of 10, 20, 40, or 80. MC12080 Table 3. ELECTRICAL CHARACTERISTICS (V = 4.5 to 5.5 V T = 40 to 85C, unless otherwise noted.) CC A Characteristic Symbol Min Typ Max Unit Toggle Frequency (Sine Wave) ft 0.1 1.4 1.1 GHz Supply Current Output (Pin 2) I 3.7 5.0 mA CC Input Voltage Sensitivity V mVpp in 100 to 250 MHz 1000 400 250 to 1100 MHz 1000 100 Divide Ratio Control Input High (SW1, SW2, SW3) V V 0.5 V V V + 0.5 V V IH CC CC CC Divide Ratio Control Input Low (SW1, SW2, SW3) V Open Open Open IL Output Voltage Swing (Note 1) V 0.8 1.2 V out pp R = 820 , I = 4.0 mA for 10 L O R = 1.6 k , I = 2.1 mA for 20 L O R = 3.3 k , I = 1.1 mA for 40 L O R = 6.2 k , I = 0.57 mA for 80 L O 1. Assumes 8.0 pF load and 1.1 GHz input frequency (typical), I at V = 5.0 V and T = 25C. O CC A DQ DQ DQ In Q CQ CQ C In 1 D Q D Q DQ DQ 0 C Q C Q CQ CQ Out SW1 SW3 SW2 Figure 1. Logic Diagram V = 4.5 to 5.5 V CC C3 Sine Wave Generator V CC C1 SW1 In SW2 50 SW3 C2 In Out Gnd External Components C R L L C1 = C2 = 1000 pF C3 = 0.1 F C = 8.0 pF (Including Scope and Jig Capacitance) L R = 820 for 10 at 1.1 GHz L Figure 2. AC Test Circuit