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DM74ALS253M bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor |
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1 / 5 page © 2000 Fairchild Semiconductor Corporation DS006215 www.fairchildsemi.com April 1984 Revised February 2000 DM74ALS253 3-STATE Dual 1-of-4 Line Data Selector/Multiplexer General Description This Data Selector/Multiplexer contains full on-chip decod- ing to select one-of-four data sources as a result of a unique two-bit binary code at the Select Inputs. Each of the two Data Selector/Multiplexer circuits have their own sepa- rate Data and Output Control inputs and a non-inverting 3- STATE output buffer. The Output Control inputs, when at the high level, place the corresponding output in the high impedance OFF-State. In order to prevent bus access con- flicts, output disable times are shorter than output enable times. The Select input buffers incorporate internal overlap features to ensure that select input changes do not cause invalid output transients. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Switching performance is guaranteed over full tempera- ture and VCC supply range s Pin and functional compatible with LS family counterpart s Improved output transient handling capability s Output control circuitry incorporates power-up 3-STATE feature Ordering Code: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Address inputs A and B are common to both sections H = HIGH Level L = LOW Level X = Don't Care Z = High Impedance Order Number Package Number Package Description DM74ALS253M M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow DM74ALS253N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Select Data Inputs Output Output Inputs Control B A C0 C1C2C3 G Y X X XXX X H Z LL L X X X L L LL H X X X L H LH X L X X L L LH X H X X L H HL X X L X L L HL X X H X L H H H XXX L L L H H XXX H L H |
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