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MC14549B Dataheets PDF



Part Number MC14549B
Manufacturers ON Semiconductor
Logo ON Semiconductor
Description Successive Approximation Registers
Datasheet MC14549B DatasheetMC14549B Datasheet (PDF)

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−Conve.

  MC14549B   MC14549B



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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 Range TA −55 to +125 °C Storage Temperature Range Tstg −65 to +150 °C Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. 1. Temperature Derating: “D/DW” Package: –7.0 mW/_C From 65_C To 125_C This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high−impedance circuit. For proper operation, Vin and Vout should be constrained to the range VSS ≤ (Vin or Vout) ≤ VDD. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either VSS or VDD). http://onsemi.com 1 SOIC−16 WB DW SUFFIX CASE 751G PIN ASSIGNMENT Q4 1 Q5 2 Q6 3 Q7 4 Sout 5 D6 C7 VSS 8 16 VDD 15 Q3 14 Q2 13 Q1 12 Q0 11 EOC 10 * 9 SC *For MC14549B Pin 10 is MR input. For MC14559B Pin 10 is FF input. MARKING DIAGRAM 16 MC145x9B AWLYYWWG 1 x = 4 or 5 A = Assembly Location WL = Wafer Lot YY = Year WW = Work Week G = Pb−Free Package ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 3 of this data sheet. © Semiconductor Components Industries, LLC, 2014 1 July, 2014 − Rev. 8 Publication Order Number: MC14549B/D MC14549B, MC14559B MC14549B TRUTH TABLES SC SC(t−1) MR MR(t−1) Clock Action X X.


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