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| DM74LS503 8-Bit Successive Approximation Register March 1989 Revised March 2000 DM74LS503 8-Bit Successive Approximation Register (with Expansion Control) General Description The DM74LS503 register has an active LOW Enable (E) input that is used in cascading two or more packages for longer word lengths. A HIGH signal on E, after a START operation, forces Q7 HIGH and prevents the device from accepting serial data. With the E input of an DM74LS503 connected to the CC output of a preceding (more significant) device, the DM74LS503 will be inhibited until the preceding device is filled, causing its CC output to go LOW. This LOW signal then enables the DM74LS503 to accept the serial data on subsequent clocks. Features s Performs serial-to-parallel conversion s Expansion control for longer words s Storage and control for successive approximation A to D conversion s Low power Schottky version of 2503 Ordering Code: Order Number DM74LS503N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagram Logic Symbol VCC = Pin 16 GND = Pin 8 Pin Descriptions Pin Names D S CP E CC Q0-Q7 Q7 Description Serial Data Input Start Input (Active LOW) Clock Pulse Input (Active Rising Edge) Conversion Enable Input (Active LOW) Conversion Complete Output (Active LOW) Parallel Register Outputs Complement of Q7 Output (c) 2000 Fairchild Semiconductor Corporation DS010190 www.fairchildsemi.com DM74LS503 Logic Diagrams Note: Cell logic is repeated for register stages Q5 to Q1. Connection for Longer Word Lengths www.fairchildsemi.com 2 DM74LS503 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 0C to +70C -65C to +150C Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA tS (H) tS (L) tH (H) tH (L) tS (H) tS (L) tH (H) tH (L) tW (H) tW (L) Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage LOW Level Output Current Free Air Operating Temperature Setup Time HIGH or LOW S to CP Hold Time HIGH or LOW S to CP Setup Time HIGH or LOW D to CP Hold Time HIGH or LOW D to CP CP Pulse Width HIGH or LOW 0 16 16 0 0 8 8 10 10 46 46 Parameter Min 4.75 2 0.8 -0.4 8 70 Nom 5 Max 5.25 Units V V V mA mA C ns ns ns ns ns Electrical Characteristics Over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL II IIH IIL IOS ICC Parameter Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current @ Max Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current Conditions VCC = Min, II = -18 mA VCC = Min, IOH = Max, VIL = Max VCC = Min, IOL = Max, VIH = Min IOL = 4 mA, VCC = Min VCC = Max, VI = 7V VI = 10V VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 3) VCC = Max -20 2.7 0.5 0.4 0.1 20 -0.8 -100 65 Min Typ (Note 2) Max -1.5 Units V V V mA A mA mA mA Note 2: All typicals are at VCC = 5V, TA = 25C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Switching Characteristics VCC = +5.0V, TA = +25C Symbol fMAX tPLH tPHL tPLH tPHL Parameter Maximum Count Frequency Propagation Delay CP to Qn or CC Propagation Delay E to Q7 RL = 2 k, CL = 15 pF Min 15 35 25 20 24 Max Units MHz ns ns 3 www.fairchildsemi.com DM74LS503 8-Bit Successive Approximation Register Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N16E Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 4 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com |
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