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MM74HCT688

MM74HCT688

  • 厂商:

    NSC

  • 封装:

  • 描述:

    MM74HCT688 - 8-Bit Magnitude Comparator (Equality Detector) - National Semiconductor

  • 数据手册
  • 价格&库存
MM74HCT688 数据手册
MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector) February 1988 MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector) General Description This equality detector utilizes advanced silicon-gate CMOS technology to compare bit for bit two 8-bit words and indicate whether or not they are equal The P e Q output indicates equality when it is low A single active low enable is provided to facilitate cascading of several packages and enable comparison of words greater than 8 bits This device is useful in memory block decoding applications where memory block enable signals must be generated from computer address information The comparator combines the low power consumption of CMOS but inputs are compatible with TTL logic levels and the output can drive 10 low power Schottky equivalent loads MM54HCT MM74HCT devices are intended to interface between TTL and NMOS components and standard CMOS devices These parts are also plug in replacements for LSTTL devices and can be used to reduce power consumption in existing designs All inputs are protected from damage due to static discharge by diodes to VCC and ground Features Y Y Y Y Y TTL input compatible Typical propagation delay 20 ns Low quiescent current 80 mA maximum (74HCT Series) Large output current 4 mA Same as HCT521 Logic Diagrams TL F 5371 – 2 C1995 National Semiconductor Corporation TL F 5371 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Notes 1 2) Operating Conditions Supply Voltage (VCC) DC Input or Output Voltage (VIN VOUT) Operating Temp Range (TA) MM74HCT688 MM54HCT688 Input Rise or Fall Times (tr tf) Min 45 0 Max 55 VCC Units V V If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC) DC Input Voltage (VIN) DC Output Voltage (VOUT) Clamp Diode Current (IIK IOK) DC Output Current per pin (IOUT) DC VCC or GND Current per pin (ICC) Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) S O Package only Lead Temperature (TL) (Soldering 10 seconds) b 0 5 to a 7 0V b 1 5 to VCC a 1 5V b 0 5 to VCC a 0 5V g 20 mA g 25 mA g 50 mA b 40 b 55 a 85 a 125 C C ns 500 b 65 C to a 150 C 600 mW 500 mW 260 C DC Electrical Characteristics Symbol Parameter (VCC e 5V g 10% unless otherwise specified) TA e 25 C Typ 74HCT TA eb40 to 85 C 54HCT TA eb55 to 125 C Conditions Units Guaranteed Limits 20 08 20 08 20 08 V V VIH VIL VOH Minimum High Level Input Voltage Maximum Low Level Input Voltage Minimum High Level Output Voltage VIN e 0 8V or 2 0V lIOUTl e 20 mA lIOUTl e 4 0 mA VCC e 4 5V lIOUTl e 4 8 mA VCC e 5 5V VIN e V0 8V or 2 0V lIOUTl e 20 mA lIOUTl e 4 0 mA VCC e 4 5V lIOUTl e 4 8 mA VCC e 5 5V VIN e VCC or GND VIN e VCC or GND IOUT e 0 mA VIN e 2 4V or 0 5V (Note 4) VCC 42 57 0 02 02 VCCb0 1 3 98 4 98 01 0 26 0 26 g0 1 VCCb0 1 3 84 4 84 01 0 33 0 33 g1 0 VCCb0 1 37 47 01 04 04 g1 0 V V V V V V mA mA mA VOL Maximum Low Level Voltage IIN ICC Maximum Input Current Maximum Quiescent Supply Current 80 03 80 04 160 05 Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur Note 2 Unless otherwise specified all voltages are referenced to ground Note 3 Power Dissipation temperature derating plastic ‘‘N’’ package b 12 mW C from 65 C to 85 C ceramic ‘‘J’’ package b 12 mW C from 100 C to 125 C Note 4 Measured per pin All other inputs held at VCC or ground 2 AC Electrical Characteristics VCC e 5V TA e 25 C CL e 15 pF tr e tf e 6 ns (unless otherwise specified) Symbol tPHL tPLH tPHL tPHL Parameter Maximum Propagation Delay - P or Q to Output Maximum Propagation Delay - P or Q to Output Maximum Propagation Delay - Enable to Output Maximum Propagation Delay - Enable to Output Conditions Typ 19 13 13 10 Guaranteed Limit 30 22 20 18 Units ns ns ns ns AC Electrical Characteristics VCC e 5V g 10% CL e 50 pF tr e tf e 6 ns (unless otherwise specified) Symbol Parameter Conditions TA e 25 C Typ tPHL tPLH tPHL tPLH tTHL tTLH CPD CIN Maximum Propagation Delay - P or Q to Output Maximum Propagation Delay - P or Q to Output Maximum Propagation Delay - Enable to Output Maximum Propagation Delay - Enable to Output Maximum Output Rise and Fall Time Power Dissipation Capacitance (Note 5) Maximum Input Capacitance 23 16 16 11 8 45 5 10 10 10 35 24 24 20 15 74HCT TA eb40 to 85 C 54HCT TA eb55 to 125 C Units Guaranteed Limits 44 30 30 25 19 53 36 36 30 22 ns ns ns ns ns pF pF Note 5 CPD determines the no load dynamic power consumption PD e CPD VCC2 f a ICC VCC and the no load dynamic current consumption IS e CPD VCC a ICC Connection Diagram Dual-In-Line Package Truth Table Inputs Data PQ PeQ PlQ PkQ X Enable G L L L H PeQ L H H H TL F 5371 – 1 Top View Order Number MM54HCT688 or MM74HCT688 3 MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector) Physical Dimensions inches (millimeters) Order Number MM54HCT688J or MM74HCT688J NS Package J20A LIFE SUPPORT POLICY Order Number MM74HCT688N NS Package N20A NATIONAL’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 NATIONAL 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 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 National Semiconductor Corporation 1111 West Bardin Road Arlington TX 76017 Tel 1(800) 272-9959 Fax 1(800) 737-7018 2 A critical component is 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 National Semiconductor Europe Fax (a49) 0-180-530 85 86 Email cnjwge tevm2 nsc com Deutsch Tel (a49) 0-180-530 85 85 English Tel (a49) 0-180-532 78 32 Fran ais Tel (a49) 0-180-532 93 58 Italiano Tel (a49) 0-180-534 16 80 National Semiconductor Hong Kong Ltd 13th Floor Straight Block Ocean Centre 5 Canton Rd Tsimshatsui Kowloon Hong Kong Tel (852) 2737-1600 Fax (852) 2736-9960 National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications
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