MC12028B

Order this document by MC12028A/D MC12028A 1.1 GHz Dual Modulus Prescaler The MC12028A can be used with CMOS synthesizers requiring positive edges to trigger internal counters such as Motorola’s MC145XXX series in a PLL to provide tuning signals up to 1.1 GHz in programmable frequency steps. The MC12028B can be used with CMOS synthesizers requiring negative edges to trigger internal counters. A Divide Ratio Control (SW) permits selection of a 32/33 or 64/65 divide ratio as desired. The Modulus Control (MC) selects the proper divide number after SW has been biased to select the desired divide ratio. NOTE: The “B” Version Is Not Recommended for New Designs MC12028B MECL PLL COMPONENTS ÷64/65, ÷128/129 DUAL MODULUS PRESCALER SEMICONDUCTOR TECHNICAL DATA 1.1 GHz Toggle Frequency MC12028A for Positive Edge Triggered Synthesizers 6.5 mA Maximum, –40 to 85°C, VCC = 5.5 Vdc Modulus Control Input Level Is Compatible With Standard CMOS and TTL Low–Power 4.0 mA Typical 8 1 D SUFFIX PLASTIC PACKAGE CASE 751 (SO–8) FUNCTIONAL TABLE SW H H L L MC H L H L Divide Ratio 32 33 64 65 8 1 NOTES: 1. SW: H = VCC, L = Open. A logic L can also be applied by grouunding this pin, but this is not recommended due to increased power soncumption. 2. MC: H = 2.0 V to VCC, L = GND to 0.8 V. DESIGN GUIDE Criteria Internal Gate Count* Internal Gate Propagation Delay Internal Gate Power Dissipation Speed Power Product NOTE: * Equivalent to a two–input NAND gate P SUFFIX PLASTIC PACKAGE CAS...