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Part Number 54688
Manufacturers National Semiconductor
Logo National Semiconductor
Description 8-Bit Magnitude Comparator
Datasheet 54688 Datasheet54688 Datasheet (PDF)

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 PeQ 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 th.

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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 PeQ 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 TTL input compatible Y Typical propagation delay 20 ns Y Low quiescent current 80 mA maximum (74HCT Series) Y Large output current 4 mA Y Same as HCT521 Logic Diagrams C1995 National Semiconductor Corporation TL F 5371 TL F 5371 – 2 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Notes 1 2) 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 b0 5 to a7 0V b1 5 to VCCa1 5V b0 5 to VCCa0 5V g20 mA g25 mA g50 mA b65 C to a150 C 600 mW 500 mW Lead Temperature (TL) (Soldering 10 seconds) 260 C Operating Conditions Supply Voltage (VCC) DC Input or Output Voltage (VIN VOUT) Operating Temp Range (TA) MM74HCT688 MM54HCT688 Min 45 0 b40 b55 Input Rise or Fall Times (tr tf) Max 55 VCC a85 a125 500 Units V V C C ns DC Electrical Characteristics (VCCe5V g10% unless otherwise specified) Symbol Parameter Conditions TAe25 C Typ 74HCT 54HCT TAeb40 to 85 C TAeb55 to 125 C Guaranteed Limits Units VIH Minimum High Level Input Voltage 20 20 20 V VIL Maximum Low Level Input Voltage 08 08 08 V VOH Minimum High Level VINe0 8V or 2 0V Output Voltage lIOUTle20 mA VCC VCCb0 1 l lIOUT e4 0 mA VCCe4 5V 4 2 3 98 l lIOUT e4 8 mA VCCe5 5V 5 7 4 98 VOL Maximum Low Level VINeV0 8V or 2 0V Voltage lIOUTle20 mA 0 01 l lIOUT e4 0 mA VCCe4 5V 0 2 0 26 l lIOUT e4 8 mA VCCe5 5V 0 2 0 26 IIN Maximum Input VINeVCC or GND Current 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 ICC Maximum Quiescent VINeVCC or GND Supply Current IOUTe0 mA 8 0 80 160 mA VINe2 4V or 0 5V (Note 4) 0 3 0 4 0 5 mA 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 b12 mW C from 65 C to 85 C ceramic ‘‘J’’ package b12 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 Parameter Conditions Typ tPHL Maximum Propagation Delay - P or Q to Output tPLH Maximum Propagation Delay - P or Q to Output tPHL Maximum Propagation Delay - Enable to Output tPHL Maximum Propagation Delay - Enable to Output 19 13 13 10 Guaranteed Limit 30 22 20 18 Units ns ns ns ns AC Electrical Characteristics VCC e 5V g10% CL e 50 pF tr e tf e 6 ns (unless otherwise specified) Symbol Parameter Conditions TAe25 C 74HCT TAeb40 to 85 C 54HCT TAeb55 to 125 C Typ Guaranteed Limits Units tPHL Maximum Propagation Delay - P or Q to Output 23 35 44 53 ns tPLH Maximum Propagation Delay - P or Q to Output 16 24 30 36 ns tPHL Maximum Propagation Delay - Enable to Output 16 24 30 36 ns tPLH Maximum Propagation Delay - Enable to Output 11 20 25 30 ns tTHL tTLH Maximum Output Rise and Fall Time 8 15 19 22 ns CPD Power Dissipation Capacitance (Note 5) 45 pF CIN Maximum Input Capacitance 5 10 10 10 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 Truth Table Dual-In-Line Package Inputs Data PQ Enable G PeQ PlQ PkQ X L L L H PeQ L H H H Top View Order Number MM54HCT688 or MM74HCT688 TL F 5371 – 1 3 MM54HCT688 MM74HCT688 8-Bit Magnitude Comparator (Equality Detector) Physical Dimensions inches (millimeters) O.


MM54HCT688 54688 MM74HCT688


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