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
• Pb−Free Packages are Available