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MC14549BDW Arkusz danych(PDF) 1 Page - Motorola, Inc |
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MC14549BDW Arkusz danych(HTML) 1 Page - Motorola, Inc |
1 / 9 page MOTOROLA CMOS LOGIC DATA 1 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. • 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 Two Low–Power TTL Loads, One Low–Power Schottky TTL Load or Two HTL Loads Over the Rated Temperature Range • Chip Complexity: 488 FETs or 122 Equivalent Gates MAXIMUM RATINGS* (Voltages referenced to VSS) Rating Symbol Value Unit DC Supply Voltage VDD – 0.5 to + 18 Vdc Input Voltage, All Inputs Vin – 0.5 to VDD + 0.5 Vdc DC Input Current, per Pin Iin ± 10 mAdc Power Dissipation, per Package† PD 500 mW Operating Temperature Range TA – 55 to + 125 _C Storage Temperature Range Tstg – 65 to + 150 _C * Maximum Ratings are those values beyond which damage to the device may occur. †Temperature Derating: “P and D/DW” Packages: – 7.0 mW/C From 65 _C To 125_C Ceramic “L” Packages: – 12 mW/ _C From 100_C To 125_C SC SC(t–1) MR MR(t–1) Clock Action X X X X None X X 1 X Reset 1 0 0 0 Start Conversion 1 X 0 1 Start Conversion 1 1 0 0 Continue Conversion 0 X 0 X Continue Previous Operation TRUTH TABLES MC14549B X = Don’t Care t–1 = State at Previous Clock SC SC(t–1) EOC Clock Action X X X None 1 0 0 Start Conversion X 1 0 Continue Conversion 0 0 0 Continue Conversion 0 X 1 Retain Conversion Result 1 X 1 Start Conversion MC14559B MOTOROLA SEMICONDUCTOR TECHNICAL DATA © Motorola, Inc. 1995 REV 3 1/94 MC14549B MC14559B L SUFFIX CERAMIC CASE 620 ORDERING INFORMATION MC14XXXBCP Plastic MC14XXXBCL Ceramic MC14XXXBDW SOIC TA = – 55° to 125°C for all packages. P SUFFIX PLASTIC CASE 648 DW SUFFIX SOIC CASE 751G PIN ASSIGNMENT 13 14 15 16 9 10 11 12 5 4 3 2 1 8 7 6 Q0 Q1 Q2 Q3 VDD SC * EOC Q7 Q6 Q5 Q4 VSS C D Sout * For MC14549B Pin 10 is MR input. For MC14559B Pin 10 is FF input. |
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