MAX975-MAX977

19-1141; Rev 1; 11/98 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby General Description The MAX975/MAX977 single/dual comparators feature three different operating modes, and are optimized for +3V and +5V single-supply applications. The operating modes are as follows: high speed, high speed with auto-standby, and low power. Propagation delay is 28ns in high-speed mode, while supply current is only 250µA. Supply current is reduced to 3µA in low-power mode. The auto-standby feature allows the comparator to automatically change from low-power mode to highspeed mode upon receipt of an input signal. In the absence of an input signal, the comparator reverts back to low-power mode after an adjustable timeout period. The timeout period for the MAX975 to enter standby is set by a single capacitor. The dual MAX977 features independently adjustable timeout periods for each comparator using separate capacitors. The MAX975/MAX977’s inputs have a common-mode voltage range of -0.2V to (VCC - 1.2V). The differential input voltage range extends rail to rail. The outputs are capable of rail-to-rail operation without external pull-up circuitry, making these devices ideal for interface with CMOS/TTL logic. All inputs and outputs can tolerate a continuous short-circuit fault condition to either rail. The comparator’s internal hysteresis in high-speed mode ensures clean output switching, even with slow-moving input signals. The single MAX975 is available in 8-pin SO and 8-pin µMAX packages, while the dual MAX977 is available in 14-pin SO and 16-pin QSOP packages. ____________________________Features ♦ Three Operating Modes: High Speed High Speed with Auto-Standby Low Power ♦ 28ns Propagation Delay (high-speed mode) ♦ 5µA Max Supply Current in Low-Power/ Auto-Standby Modes ♦ +3V/+5V Single-Supply Operation ♦ Rail-to-Rail Outputs ♦ Ground-Sensing Input ♦ Internal Hysteresis (high-speed mode) ♦ Adjustable Timeout Period ♦ µMAX Package (MAX975) QSOP-16 Package (MAX977) MAX975/MAX977 Ordering Information PART MAX975ESA MAX975EUA MAX977ESD MAX977EEE TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 SO 8 µMAX 14 SO 16 QSOP Functional Diagram ________________________Applications Battery-Powered Systems RF ID Tags Keyless Entry Threshold Detectors/Discriminators 3V Systems IR Receivers Digital-Line Receivers IN+ VCC MAX975 LP HIGH SPEED ENABLE TRANSITION MONITOR OUT LOW POWER ENABLE IN- GND STAT TIMING CIRCUIT STO Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ............................................................+6V All Other Pins..............................................-0.3V to (VCC + 0.3V) Duration of Output Short Circuit to GND_ or VCC ......Continuous Continuous Power Dissipation (TA = +70°C) 8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW 8-Pin µMAX (derate 4.10mW/°C above +70°C) .............330mW 14-Pin SO (derate 8.33mW/°C above +70°C)................667mW 16-Pin QSOP (derate 8.33mW/°C above +70°C)...........667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.25V, specifications are for high-speed mode, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER POWER SUPPLY Supply-Voltage Operating Range Supply Current Per Comparator Power-Supply Rejection Ratio COMPARATOR INPUTS Common-Mode Voltage Range VCMR (Note 2) High-speed mode, TA = +25°C Input Offset Voltage (Note 3) VOS VCM = 1V, VCC = 5V High-speed mode, TA = TMIN to TMAX Auto-standby/ low-power modes, TA = TMIN to TMAX SO µMAX/QSOP SO µMAX/QSOP SO µMAX/QSOP 0.5 0.3 ±1 ±1 2 2 -100 -100 -5 ±20 3 -0.2V ≤ VCM ≤ VCC - 1.2V High-speed mode Low-power mode SO µMAX/QSOP 66 54 82 90 dB ±100 nA pF -0.2 +0.2 VCC - 1.2 ±2 ±3 ±5 ±7 4 4 -300 -400 nA mV mV V VCC High-speed mode ICC Auto-standby/low-power modes VCM = 1V, 2.7V ≤ VCC ≤ 5.25V SO µMAX/QSOP 63 2.7 250 3 3 90 77 5.25 500 5 6 dB µA V SYMBOL CONDITIONS MIN TYP MAX UNITS PSRR High-speed mode Low-power mode Input-Referred Hysteresis VHYS VCM = 1V, VCC = 5V (Note 4) High-speed mode Auto-standby/low-power modes Input Bias Current Input Offset Current Input Capacitance Common-Mode Rejection Ratio IB IOS CIN CMRR 2 _______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.25V, specifications are for high-speed mode, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER DIGITAL INPUTS LP Input Voltage High LP Input Voltage Low LP Fall Time LP Input Current STO_ Input Voltage Low STO_ Source Current DIGITAL OUTPUTS OUT_ Output Voltage High OUT_ Output Voltage Low Propagation Delay, Low to High (Note 6) VOH VOL ISOURCE = 2mA, all modes ISINK = 2mA, all modes CLOAD = 10pF, VCC = 5V High-speed mode, overdrive = 5mV Low-power mode, overdrive = 10mV High-speed mode, overdrive = 5mV Low-power mode, overdrive = 10mV VCC - 0.4 VCC - 0.1 0.1 28 0.82 28 0.48 2 1 1.6 1.6 VCC - 0.4 0.4 High-speed mode Low-power mode 0.4 50 1.6 50 1.6 V V ns µs ns µs ns ns ns V V VLPIH VLPIL tLP ILPB VCIL ISTO VCC = 3V (Note 5) 0.01 VCC / 2 0.15 0.7 x VCC VCC / 2 VCC / 2 0.3 x VCC 10 ±1 0.3 x VCC V V µs µA V µA SYMBOL CONDITIONS MIN TYP MAX UNITS MAX975/MAX977 tPD+ Propagation Delay, High to Low (Note 6) Propagation-Delay Skew (Note 6) Propagation-Delay Matching Rise/Fall Time STAT_ Output Voltage High STAT_ Output Voltage Low tPD- CLOAD = 10pF, VCC = 5V CLOAD = 10pF tSKEW ∆tPD MAX977 only, CLOAD = 10pF CLOAD = 10pF, VCC = 5.0V VSH VSL ISOURCE = 3mA, all modes ISINK = 400µA, all modes Note 1: The MAX975EUA is 100% production tested at TA = +25°C; all temperature specifications are guaranteed by design. Note 2: Inferred by CMRR. Either input can be driven to the absolute maximum limit without false output inversion, as long as the other input is within the specified common-mode input voltage range. Note 3: VOS is defined as the mean of trip points. The trip points are the extremities of the differential input voltage required to make the comparator output change state (Figure 1). Note 4: The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis zone (Figure 1). Note 5: Guaranteed by design. The LP pin is sensitive to noise. If fall times larger than 10µs are expected, bypass LP to ground using a 0.1µF capacitor. Note 6: Propagation delay is guaranteed by design. For low-overdrive conditions, VOS is added to the overdrive. The following equation defines propagation-delay skew: tSKEW = tPD+ - tPD-. _______________________________________________________________________________________ 3 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.25V, specifications are for high-speed mode, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Auto-Standby Timeout Auto-Standby Enable Time Auto-Standby Wake-Up Time Auto-Standby Wake-Up Input or LP Pulse Width Auto-Standby Comparator Disable Low-Power Enable Time High-Speed Enable Time Low-Power Comparator Disable Low-Power STAT_ High SYMBOL tASB tASBE tASD tPWD tASCD tLPE tHSE tLPCD tLPSH (Note 8) (Note 9) 10mV overdrive (Note 10) 10mV overdrive (Note 11) (Note 12) (Note 13) (Note 14) (Note 15) (Note 16) 1.6 0.8 3 1.1 0.7 20 4 CONDITIONS MIN 5 TYP 10 3 2 4 MAX 16 UNITS ms µs µs µs µs µs µs µs ns AUTO-STANDBY/LOW-POWER TIMING (Note 7; Figure 2) Note 7: Note 8: Note 9: Note 10: Note 11: Note 12: Note 13: Note 14: Note 15: Note 16: Timing specifications are guaranteed by design. Set by 1000pF external capacitor at the STO_ pin. tASB is defined as the time from last input transition to STAT_ = high. Does not include time to go into standby condition (tASBE). tASBE is defined as the time from when STAT_ goes high to when the supply current drops to 5µA. tASD is defined as the time from the last input transition to when STAT_ goes low. The comparator is in high-speed mode before STAT_ is low. tPWD is defined as the minimum input or LP pulse width to trigger fast-mode operation from auto-standby. tASCD is defined as the time from the last input transition to when the supply current increases to 300µA. tLPE is defined as the time from when LP is driven high to when the supply current drops to 5µA. tHSE is defined as the time from when LP goes low to when STAT goes low. The comparator is in high-speed mode before STAT_ is low. tLPCD is defined as the time from when LP goes low to when the supply current increases to 300µA. tLPSH is defined as the time from when LP goes high to when STAT_ goes high. 4 _______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby __________________________________________Typical Operating Characteristics (VCC = 3.0V, TA = +25°C, unless otherwise noted.) MAX975/MAX977 LOW-POWER OFFSET VOLTAGE vs. TEMPERATURE -0.60 -0.65 -0.70 -0.75 -0.80 -0.85 -0.90 -0.95 -1.00 -1.05 -1.10 -1.15 -1.20 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) MAX977-01 SUPPLY CURRENT PER COMPARATOR vs. OUTPUT TRANSITION FREQUENCY MAX977-02 HIGH-SPEED INPUT BIAS CURRENT vs. TEMPERATURE MAX977-03 10000 -50 -70 VCC = 3V -90 -110 -130 -150 VCC = 3V OFFSET VOLTAGE (mV) SUPPLY CURRENT PER COMPARATOR (µA) 1000 HIGH-SPEED MODE 100 INPUT BIAS CURRENT (nA) VCC = 5V 10 LOW-POWER MODE 1 0.01k 0.1k -170 1k 10k 100k 1M 10M 100M -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) TRANSITION FREQUENCY (kHz) LOW-POWER INPUT BIAS CURRENT vs. TEMPERATURE MAX977-04 HIGH-SPEED VOLTAGE TRIP POINTS/INPUT OFFSET VOLTAGE vs. TEMPERATURE MAX977-05 HIGH-SPEED VOLTAGE TRIP POINTS/INPUT OFFSET VOLTAGE vs. TEMPERATURE TRIP POINTS/OFFSET VOLTAGE (mV) 1.2 1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -60 -40 -20 0 20 VCC = 3V VTRIP+ MAX977-06 7.0 6.5 INPUT BIAS CURRENT (nA) 6.0 5.5 VCC = 5V 5.0 4.5 VCC = 3V 4.0 3.5 3.0 -60 -40 -20 0 20 40 60 80 1.0 TRIP POINTS/OFFSET VOLTAGE (mV) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -60 -40 -20 0 20 40 60 80 VTRIPVOS VCC = 5V VTRIP+ VOS VTRIP- 100 100 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) LOW-POWER PROPAGATION DELAY vs. CAPACITIVE LOAD MAX977-07 LOW-POWER PROPAGATION DELAY vs. INPUT OVERDRIVE MAX977-08 AUTO-STANDBY TIMEOUT vs. TEMPERATURE 10.1 10.0 MAX977-09 600 550 PROPAGATION DELAY (ns) 500 450 400 350 300 250 200 0 50 100 150 200 VCC = 3V tPDVCC = 5V 50mV OVERDRIVE VCC = 3V VCC = 5V tPD+ 700 650 PROPAGATION DELAY (ns) 600 550 500 450 400 350 300 250 200 150 0 40 80 VCC = 5V 120 160 200 VCC = 3V tPDVCC = 3V VCC = 5V tPD+ CLOAD =15pF 10.2 TIMEOUT (ms) 9.9 9.8 9.7 9.6 9.5 9.4 9.3 VCC = 5V VCC = 3V 250 240 -60 -40 -20 0 20 40 60 80 100 CAPACITIVE LOAD (pF) INPUT OVERDRIVE (mV) TEMPERATURE (°C) _______________________________________________________________________________________ 5 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 ____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) AUTO-STANDBY TIMEOUT vs. TIMEOUT CAPACITOR MAX977-10 OUTPUT HIGH VOLTAGE vs. OUTPUT SOURCE CURRENT MAX977-11 OUTPUT LOW VOLTAGE vs. OUTPUT SINK CURRENT VCC = 3V 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 TA = -40°C TA = +85°C TA = +25°C MAX977-12 100000 3.5 VCC = 3V 3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 TA = +25°C TA = -40°C 3.5 10000 TIMEOUT (µs) 1000 100 TA = +85°C 10 1 1 10 100 1000 10000 CAPACITANCE (pF) 0.0 0 5 10 15 20 25 30 35 SOURCE CURRENT (mA) 0.0 0 5 10 15 20 25 30 35 40 SINK CURRENT (mA) HIGH-SPEED PROPAGATION DELAY vs. TEMPERATURE (VCC = 5V) MAX977-13 HIGH-SPEED PROPAGATION DELAY vs. TEMPERATURE (VCC = 3V) MAX977-14 HIGH-SPEED SUPPLY CURRENT PER COMPARATOR vs. TEMPERATURE (VCC = 5V) 400 375 350 325 300 275 250 225 200 175 150 125 100 MAX977-15 30 CLOAD = 15pF VOD = 50mV PROPAGATION DELAY (ns) 26 tPD22 tPD+ 18 35 33 PROPAGATION DELAY (ns) 31 29 27 25 23 21 19 17 tPDtPD+ CLOAD = 15pF VOD = 50mV SUPPLY CURRENT (µA) OUT_ = HIGH OUT_ = LOW 14 10 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) 15 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) HIGH-SPEED SUPPLY CURRENT PER COMPARATOR vs. TEMPERATURE (VCC = 3V) MAX977-16 STANDBY/LOW-POWER SUPPLY CURRENT PER COMPARATOR vs. TEMPERATURE (VCC = 5V) MAX977-17 STANDBY/LOW POWER-SUPPLY CURRENT PER COMPARATOR vs. TEMPERATURE (VCC = 3V) 3.6 SUPPLY CURRENT (µA) 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 OUT = HIGH -60 -40 -20 0 20 40 60 80 100 OUT = LOW MAX977-18 300 280 SUPPLY CURRENT (µA) 260 240 220 200 180 OUT_ = LOW 160 140 120 100 -60 -40 -20 0 20 40 60 80 OUT_ = HIGH 4.5 4.0 SUPPLY CURRENT (µA) 3.5 3.0 2.5 2.0 1.5 3.8 OUT_ = LOW OUT_ = HIGH 1.8 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) 100 TEMPERATURE (°C) 6 _______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) MAX975/MAX977 HIGH-SPEED PROPAGATION DELAY vs. CAPACITIVE LOAD 45.0 42.5 40.0 37.5 35.0 32.5 30.0 27.5 25.0 22.5 20.0 17.5 15.0 0 50 100 MAX977-19 HIGH-SPEED PROPAGATION DELAY vs. INPUT OVERDRIVE MAX977-20 LOW-POWER PROPAGATION DELAY vs. TEMPERATURE (VCC = 3V) 560 PROPAGATION DELAY (ns) 520 480 440 400 360 320 280 240 200 -60 -40 -20 0 20 40 60 80 100 tPDtPD+ CLOAD = 15pF VOD = 50mV MAX977-21 30 tPDPROPAGATION DELAY (ns) 25 20 15 10 5 CLOAD = 15pF 0 tPD+ VCC = +5V VCC = +3V 600 PROPAGATION DELAY (ns) CLOAD = 15pF VOD = 50mV tPD- VCC = +3V tPD+ tPDVCC = +5V tPD+ 150 200 250 0 20 40 60 80 100 120 140 160 180 200 INPUT OVERDRIVE (mV) CAPACITIVE LOAD (pF) TEMPERATURE (°C) LOW-POWER PROPAGATION DELAY vs. TEMPERATURE (VCC = 5V) 750 700 650 600 550 500 450 400 350 300 250 200 150 -60 -40 -20 0 20 40 60 80 100 CLOAD = 15pF VOD = 50mV MAX977-22 PROPAGATION DELAY tPD+ HIGH-SPEED MODE (VCC = +3V) PROPAGATION DELAY (ns) VOS VCC INPUT 5mV/div tPD+ VCC/2 tPDOUTPUT 1V/div GND MAX975/977 TOC23 5ns/div tPD+ TEMPERATURE (°C) PROPAGATION DELAY tPDHIGH-SPEED MODE (VCC = +3V) PROPAGATION DELAY tPDHIGH-SPEED MODE (VCC = +5V) VOS VCC VCC/2 INPUT 5mV/div VOS INPUT 5mV/div OUTPUT 1V/div VCC VCC/2 GND OUTPUT 2V/div GND MAX975/977 TOC24 MAX975/977 TOC25 5ns/div tPD- 5ns/div tPD- _______________________________________________________________________________________ 7 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 ____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) PROPAGATION DELAY tPD+ HIGH-SPEED MODE (VCC = +5V) INPUT 5mV/div PROPAGATION DELAY tPDLOW-POWER MODE (VCC = +3V) INPUT 5mV/div VOS VOS VCC VCC VCC/2 GND MAX975/977 TOC26 VCC/2 OUTPUT 2V/div OUTPUT 1V/div GND MAX975/977 TOC27 5ns/div tPD+ 100ns/div tPD- PROPAGATION DELAY tPD+ LOW-POWER MODE (VCC = +3V) VOS VCC VCC/2 GND INPUT 5mV/div OUTPUT 1V/div MAX975/977 TOC28 100ns/div tPD+ PROPAGATION DELAY tPD+ LOW-POWER MODE (VCC = +5V) PROPAGATION DELAY tPDLOW-POWER MODE (VCC = +3V) VOS INPUT 5mV/div VOS INPUT 5mV/div VCC VCC/2 GND OUTPUT 2V/div VCC VCC/2 GND OUTPUT 2V/div MAX975/977 TOC29 MAX975/977 TOC30 100ns/div tPD+ 100ns/div tPD- 8 _______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ____________________________Typical Operating Characteristics (continued) (VCC = 3.0V, TA = +25°C, unless otherwise noted.) 100kHz RESPONSE LOW-POWER MODE (VCC = +3V) 100kHz RESPONSE LOW-POWER MODE (VCC = +5V) MAX975/MAX977 VOS VCC INPUT 5mV/div VOS INPUT 5mV/div VCC OUTPUT 1V/div GND GND OUTPUT 2V/div 2µs/div MAX975/977 TOC31 2µs/div MAX975/977 TOC32 10MHz RESPONSE HIGH-SPEED MODE (VCC = +5V) VOS INPUT 5mV/div VCC OUTPUT 2V/div GND MAX975/977 TOC34 20ns/div 10MHz RESPONSE HIGH-SPEED MODE (VCC = +3V) +100mV VOS VCC OUTPUT 1V/div GND OUT 0V ICC 250µA 0µA MAX975/977 TOC33 MAX975 AUTO-STANDBY OPERATION INPUT 5mV/div Inp -100mV 3V MAX975/977 TOC35 20ns/div 1ms/div CSTO_ = 100pF _______________________________________________________________________________________ 9 Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 _____________________________________________________________Pin Descriptions MAX975 PIN 1 2 3 4 NAME VCC IN+ INSTAT Positive Supply Voltage, +2.7V to +5.25V Noninverting Comparator Input Inverting Comparator Input Mode Status Pin. Indicates the operating mode. STAT is high for auto-standby mode or low-power mode, and during the transition to high-speed mode. STAT = low indicates that the comparator is in high-speed mode. STAT can source 3mA to power additional circuitry. Set Timeout Input. Connect a capacitor from STO to GND to program the time the comparator may remain idle before entering standby mode. Connect STO to GND to disable the auto-standby feature. Calculate timeout with the following relationship: tASB = 10 x C µs, where C is in pF. Ground Comparator Output Low Power Mode Input. Drive LP high for low-power mode. Drive LP low for high-speed mode (STO = GND) or for high-speed mode with auto-standby. Connect to GND if low-power mode will not be used. Connect to VCC if high-speed mode will not be used. FUNCTION 5 6 7 8 STO GND OUT LP MAX977 SO QSOP NAME STOA, STOB GNDA, GNDB OUTA, OUTB VCC INB+, INA+ INB-, INAFUNCTION Set Idle Timeout Input A/B. Connect a capacitor from STOA/STOB to GND to program the time in which comparator A/B may remain idle before entering standby mode. Connect STOA/STOB to GND to disable the auto-standby feature for comparator A/B. Calculate timeout with the following relationship: tASB = 10 x C µs, where C is in pF. Ground for Comparator A/B Output for Comparator A/B Positive Supply Voltage, +2.7V to +5.25V. For QSOP, connect pin 4 to pin 5. Noninverting Input for Comparator B/A Inverting Input for Comparator B/A Mode Status Pin B/A. Indicates the operating mode of comparator B/A. STATB/STATA is high for auto-standby mode or for low-power mode, and during the transition to high-speed mode. STATB/STATA = low indicates that comparator B/A is in high-speed mode. STATB/STATA can source 3mA to power additional circuitry. No connection. Not internally connected. Low Power Mode Input for both comparators. Drive LP high for low-power mode. Drive LP low for high-speed mode (STO_ = GND) or for high-speed mode with autostandby. Connect to GND if low-power mode will not be used. Connect to VCC if high-speed mode will not be used. 1, 8 1, 9 2, 9 3, 10 4 5, 12 6, 13 2, 10 3, 11 4, 5 6, 14 7, 15 7, 14 8, 16 STATB, STATA — 12 N.C. 11 13 LP 10 ______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby MAX975/MAX977 Table 1. Programming INPUTS LP L L ↓ (falling edge) H STO_ tASB = CSTO x 10µs/pF tASB = CSTO x 10µs/pF L X IDLE TIME