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| DM74ALS520 * DM74ALS521 8-Bit Comparator September 1986 Revised April 2000 DM74ALS520 * DM74ALS521 8-Bit Comparator General Description These comparators perform an "equal to" comparison of two 8-bit words with provision for expansion or external enabling. The matching of the two 8-bit input plus a logic LOW on the EN input produces the output A = B on the DM74ALS520 and DM74ALS521. The DM74ALS520 and DM74ALS521 have totem pole outputs for wire AND cascading. Additionally, the DM74ALS520 is provided with B input pull up termination resistors for analog or switch data. Features s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range s Advanced oxide-isolated, ion-implanted Schottky TTL process s Functionally and pin for pin compatible with LS family counterpart s Improved output transient handling capability Ordering Code: Ordering Code DM74ALS520WM DM74ALS520N DM74ALS521WM SM74ALS521N Package Number M20B N20A M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Function Table Inputs EN L L H H = HIGH Logic Level L = LOW Logic Level X = Don't Care Output Data A=B AB X A=B L H H (c) 2000 Fairchild Semiconductor Corporation DS006114 www.fairchildsemi.com DM74ALS520 * DM74ALS521 Logic Diagram www.fairchildsemi.com 2 DM74ALS520 * DM74ALS521 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 62.0C/W 82.0C/W 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 Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Free Air Operating Temperature 0 Parameter Min 4.5 2 0.8 -2.6 24 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VCC = 4.5V to 5.5V IOH = -400 A VCC = 4.5V IOH = Max VOL II LOW Level Output Voltage Max HIGH Input Current IIH IIL IO ICC HIGH Level Input Current Low Level Input Current Output Drive Current Supply Current VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V VCC = 5.5V (Note 2) VCC = 4.5V VCC = 5.5V IOL = 24 mA VIH = 5.5V B Input DM74ALS520 VIH = 7V, All Others All Others B Input DM74ALS520 B Input DM74ALS520 All Others VO = 2.25V -30 12 20 -200 -0.6 -0.1 -112 19 A mA mA mA mA 0.1 mA Conditions VCC = 4.5V, II = -18 mA VCC - 2 2.4 3.2 0.35 0.5 Min Typ Max -1.5 Units V V V V Note 2: ICC is measured with EN grounded, A and B inputs at 4.5V and outputs OPEN. Switching Characteristics over recommended operating free air temperature range Symbol tPLH Parameter Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPLH Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output Conditions VCC = 4.5V to 5.5V CL = 50 pF RL = 500 From Input A or B Data A or B Data EN To Output A=B A=B A=B A=B Min Max Units 3 12 ns 5 20 ns 2 12 ns EN 5 22 ns 3 www.fairchildsemi.com DM74ALS520 * DM74ALS521 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B www.fairchildsemi.com 4 DM74ALS520 * DM74ALS521 8-Bit Comparator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Package Number N20A 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. 5 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 www.fairchildsemi.com |
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