MM74C905

MM74C905 12-Bit Successive Approximation Register October 1987 Revised January 1999 MM74C905 12-Bit Successive Approximation Register General Description The MM74C905 CMOS 12-bit successive approximation register contains all the digit control and storage necessary for successive approximation analog-to-digital conversion. Because of the unique capability of CMOS to switch to each supply rail without any offset voltage, it can also be used in digital systems as the control and storage element in repetitive routines. Features s Wide supply voltage range: s Guaranteed noise margin: s High noise immunity: 3.0V to 15V 1.0V 0.45 VCC (typ) Fan out of 2 driving 74L s Low power TTL compatibility: s Provision for register extension or truncation s Operates in START/STOP or continuous conversion mode s Drive ladder switches directly. For 10 bits or less with 50k/100k R/2R ladder network Ordering Code: Order Number MM74C905N Package Number N24A Package Description 24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-010, 0.600” Wide Connection Diagram Pin Assignments for DIP © 1999 Fairchild Semiconductor Corporation DS005910.prf www.fairchildsemi.com MM74C905 Truth Table Time tn 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 D X D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X H = HIGH Level L = LOW Level X = Don’t Care NC = No Change Inputs S L H H H H H H H H H H H H H X X E L L L L L L L L L L L L L L L H D0 X X D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X Q11 X L D11 D11 D11 D11 D11 D11 ...