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| MM74C85 4-Bit Magnitude Comparator October 1987 Revised January 1999 MM74C85 4-Bit Magnitude Comparator General Description The MM74C85 is a four-bit magnitude comparator which will perform comparison of straight binary or BCD codes. The circuit consists of eight comparing inputs (A0, A1, A2, A3, B0, B1, B2, B3), three cascading inputs (A > B, A < B and A = B), and three outputs (A > B, A < B and A = B). This device compares two four-bit words (A and B) and determines whether they are "greater than," "less than," or "equal to" each other by a high level on the appropriate output. For words greater than four-bits, units can be cascaded by connecting the outputs (A > B, A < B, and A = B) of the least significant stage to the cascade inputs (A > B, A < B and A = B) of the next-significant stage. In addition the least significant stage must have a high level voltage (VIN(1)) applied to the A = B input and low level voltage (VIN(0)) applied to A > B and A < B inputs. Features s Wide supply voltage range: s Guaranteed noise margin: s High noise immunity: fan out of 2 driving 74L s Expandable to 'N' stages s Applicable to binary or BCD s Low power pinout: 74L85 3.0V to 15V 1.0V 0.4 VCC (typ.) s Low power: TTL compatibility: Ordering Code: Order Number MM74C85N Package Number N16E Package Description 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Connection Diagram Pin Assignments for DIP Top View (c) 1999 Fairchild Semiconductor Corporation DS005886.prf www.fairchildsemi.com MM74C85 Truth Table Comparing Inputs A3, B3 A3 > B3 A3 < B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A2, B2 X X A2 > B2 A2 < B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A2 = B2 A1, B1 X X X X A1 > B1 A1 < B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A1 = B1 A0, B0 X X X X X X A0 > B0 A0 < B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 X X X X X X X X H L L L H H H L Cascading Inputs A>B AB H L H L H L H L H L L L H H H L Outputs AH = HIGH Level, L = LOW Level, X = Irrelevant Logic Diagram www.fairchildsemi.com 2 MM74C85 Absolute Maximum Ratings(Note 1) Voltage at Any Pin Operating Temperature Range Storage Temperature Range Power Dissipation (PD) Dual-In-Line Small Outline Operating VCC Range 700 mW 500 mW 3.0V to 15V -0.3V to VCC + 0.3V -40C to +85C -65C to +150C VCC Lead Temperature (Soldering, 10 seconds) 18V 260C Note 1: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. Except for "Operating Temperature Range" they are not meant to imply that the devices should be operated at these limits. The table of "Electrical Characteristics" provides conditions for actual device operation. DC Electrical Characteristics Min/Max limits apply across temperature range unless otherwise noted Symbol CMOS TO CMOS VIN(1) VIN(0) VOUT(1) VOUT(0) IIN(1) IIN(0) ICC VIN(1) VIN(0) VOUT(1) VOUT(0) ISOURCE ISOURCE ISINK ISINK Logical "1" Input Voltage Logical "0" Input Voltage Logical "1" Output Voltage Logical "0" Output Voltage Logical "1" Input Current Logical "0" Input Current Supply Current Logical "1" Input Voltage Logical "0" Input Voltage Logical "1" Output Voltage Logical "0" Output Voltage Output Source Current (P-Channel) Output Source Current (P-Channel) Output Sink Current (N-Channel) Output Sink Current (N-Channel) VCC = 5.0V VCC = 10V VCC = 5.0V VCC = 10V VCC = 5.0V, IO = -10 A VCC = 10V, IO = -10 A VCC = 5.0V, IO = +10 A VCC = 10V, IO = +10 A VCC = 15V, VIN = 15V VCC = 15V, VIN = 0V VCC = 15V VCC = 4.75V VCC = 4.75V VCC = 4.75V, IO = -360 A VCC = 4.75V, IO = 360 A VCC = 5.0V, VOUT = 0V TA = 25C VCC = 10V, VOUT = 0V TA = 25C VCC = 5.0V, VOUT = VCC TA = 25C VCC = 10V, VOUT = VCC TA = 25C 8.0 16 mA 1.75 3.6 mA -8.0 -15 mA -1.75 -3.3 2.4 0.4 VCC - 1.5 0.8 -1.0 0.005 -0.005 0.05 300 4.5 9.0 0.5 1.0 1.0 3.5 8.0 1.5 2.0 V V V V V V V V A A A V V V V mA Parameter Conditions Min Typ Max Units CMOS/LPTTL INTERFACE OUTPUT DRIVE (See Family Characteristics Data Sheet) (Short Circuit Current) AC Electrical Characteristics TA = 25C, CL = 50 pF, unless otherwise specified Symbol tpd Parameter Propagation Delay from any A or B Data Input to any Data Output tpd Propagation Delay Time from any Cascade Input to any Output CIN CPD Input Capacitance Power Dissipation Capacitance (Note 2) Conditions Min Typ 250 100 200 100 5.0 45 Max 600 300 500 250 Units ns ns ns ns pF pF VCC = 50V VCC = 10V VCC = 50V VCC = 10V Any Input Per Package (Note 4) Note 2: AC Parameters are guaranteed by DC correlated testing. Note 3: Capacitance is guaranteed by periodic testing. Note 4: CPD determines the no load AC power consumption of any CMOS device. For complete explanation see Family Characteristics application note, AN-90. 3 www.fairchildsemi.com MM74C85 Typical Applications Four Digit Comparator Switching Time Waveforms Unused inputs must be tied to an appropriate logic level. www.fairchildsemi.com 4 MM74C85 4-Bit Magnitude Comparator Physical Dimensions inches (millimeters) unless otherwise noted 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N16E 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: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. 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 www.fairchildsemi.com user. 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. |
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