MAX977 Maxim, MAX977 Datasheet
MAX977
Available stocks
Related parts for MAX977
MAX977 Summary of contents
Page 1
... 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 ...
Page 2
... SO (derate 5.88mW/°C above +70°C)..................471mW 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 ...
Page 3
... PD Low-power mode, overdrive = 10mV High-speed mode, overdrive = 5mV C = 10pF, LOAD PD Low-power mode, overdrive = 10mV C = 10pF LOAD t MAX977 only 10pF PD LOAD High-speed mode C = 10pF, LOAD V = 5.0V Low-power mode 3mA, all modes SH SOURCE 400µA, all modes SL SINK = +25 C ...
Page 4
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V, specifications are for high-speed mode +25°C.) (Note 1) A PARAMETER SYMBOL AUTO-STANDBY/LOW-POWER TIMING (Note 7; Figure 2) Auto-Standby Timeout t ASB Auto-Standby ...
Page 5
Operating Characteristics (V = 3.0V +25°C, unless otherwise noted LOW-POWER OFFSET VOLTAGE vs. TEMPERATURE -0.60 -0. -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 ...
Page 6
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ____________________________Typical Operating Characteristics (continued 3.0V +25°C, unless otherwise noted AUTO-STANDBY TIMEOUT vs. TIMEOUT CAPACITOR 100000 10000 1000 100 100 1000 10,000 CAPACITANCE (pF) HIGH-SPEED ...
Page 7
Operating Characteristics (continued 3.0V +25°C, unless otherwise noted HIGH-SPEED PROPAGATION DELAY vs. CAPACITIVE LOAD 45.0 42 15pF LOAD 50mV 40.0 OD 37.5 t PD- 35.0 ...
Page 8
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby ____________________________Typical Operating Characteristics (continued 3.0V +25°C, unless otherwise noted PROPAGATION DELAY t HIGH-SPEED MODE (V = +5V GND 5ns/div t ...
Page 9
Operating Characteristics (continued 3.0V +25°C, unless otherwise noted 100kHz RESPONSE LOW-POWER MODE ( GND 2 s/div 10MHz RESPONSE HIGH-SPEED MODE ( GND 20ns/div ...
Page 10
... OUT Comparator Output Low Power Mode Input. Drive LP high for low-power mode. Drive LP low for high-speed mode 8 LP (STO = GND) or for high-speed mode with auto-standby. Connect to GND if low-power mode will not be used. Connect to V MAX977 SO QSOP NAME STOA STOB ...
Page 11
... The timeout period, or the time that OUT_ must be idle (unchanged state) for the MAX975/ MAX977 to enter auto-standby, is adjustable by means of an external capacitor. All inputs and outputs can tol- erate a continuous short-circuit fault condition to either rail. Internal hysteresis in high-speed mode ensures clean output switching, even with slow-moving input signals ...
Page 12
... Note that driving STO_ low while in auto- standby mode will not bring the comparator out of auto- standby mode. Also, if driving STO_ with an open drain, leakage must be less than 1nA. On power-up, the device is in high-speed mode unless LP is high. The MAX977 operates in the same manner as the MAX975. 12 ______________________________________________________________________________________ t t ...
Page 13
... CMOS logic isolated with a low-leakage (<1nA) diode, such as National’s FJT1100 (Figure 3). 15nA leakage typically results in 10% error. The MAX977 has separate timing inputs (STOA and STOB). These pins must have separate capacitors. The timing circuits will not operate correctly if a single capacitor is used with STOA and STOB connected together ...
Page 14
... NUMBERS SHOWN ARE FOR QSOP PACKAGE) Figure 5. Window Comparator Window Comparator The MAX977 is ideal for making a window detector (undervoltage/overvoltage detector). The schematic shown in Figure 5 uses a MAX6120 reference and com- ponent values selected for a 2.0V undervoltage thresh- old and a 2.5V overvoltage threshold. Choose different thresholds by changing the values of R1, R2, and R3 ...
Page 15
... Configurations TOP VIEW IN MAX975 IN STAT 4 5 SO/ MAX ___________________Chip Information TRANSISTOR COUNT: 522 (MAX975) 1044 (MAX977) ______________________________________________________________________________________ Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby STOA 1 14 STATA 2 13 GNDA INA OUTA 3 INA+ OUT MAX977 GND CC STO ...
Page 16
... Single/Dual, +3V/+5V Dual-Speed Comparators with Auo-Standby (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages Ø0.50±0.1 0.6±0.1 1 0.6±0.1 D TOP VIEW FRONT VIEW 16 ______________________________________________________________________________________ BOTTOM VIEW ...
Page 17
... Pages changed at Rev 10, 14–16 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...