MC14549B

MC14549B, MC14559B Successive Approximation Registers The MC14549B and MC14559B successive approximation registers are 8−bit registers providing all the digital control and storage necessary for successive approximation analog−to−digital conversion systems. These parts differ in only one control input. The Master Reset (MR) on the MC14549B is required in the cascaded mode when more than 8 bits are desired. The Feed Forward (FF) of the MC14559B is used for register shortening where End−of−Conversion (EOC) is required after less than eight cycles. Applications for the MC14549B and MC14559B include analog−to−digital conversion, with serial and parallel outputs. Features Totally Synchronous Operation All Outputs Buffered Single Supply Operation Serial Output Retriggerable Compatible with a Variety of Digital and Analog Systems such as the MC1408 8−Bit D/A Converter All Control Inputs Positive−Edge Triggered Supply Voltage Range = 3.0 Vdc to 18 Vdc Capable of Driving 2 Low−Power TTL Loads, 1 Low−Power Schottky TTL Load or 2 HTL Loads Over the Rated Temperature Range Chip Complexity: 488 FETs or 122 Equivalent Gates This Device is Pb−Free and is RoHS Compliant MAXIMUM RATINGS (Voltages Referenced to VSS) Parameter Symbol Value Unit DC Supply Voltage Range VDD −0.5 to +18.0 V Input Voltage Range, All Inputs Vin −0.5 to VDD + 0.5 V DC Input Current per Pin Iin ±10 mA Power Dissipation per Package (Note 1) PD 500 mW Operating Temperature Ran...