MAX975 Maxim, MAX975 Datasheet
MAX975
Available stocks
Related parts for MAX975
MAX975 Summary of contents
Page 1
... 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 MAX ® packages, while the dual MAX977 is available in 14-pin SO and 16-pin QSOP packages. ...
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
... STAT_ Output Voltage High V STAT_ Output Voltage Low Note 1: The MAX975EUA is 100% production tested at T 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. ...
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
... TEMPERATURE (°C) PROPAGATION DELAY HIGH-SPEED MODE (V = +3V) CC INPUT 5mV/div OUTPUT 1V/div MAX975/977 TOC23 5ns/div t PD+ PROPAGATION DELAY t PD- HIGH-SPEED MODE (V = +5V) CC INPUT 5mV/div OUTPUT 2V/div MAX975/977 TOC25 5ns/div t PD 15pF LOAD V = 50mV OD PD 100 7 ...
Page 8
... V OS 5mV/div V CC OUTPUT V /2 2V/div CC GND MAX975/977 TOC29 PROPAGATION DELAY t PD- LOW-POWER MODE (V = +3V) CC INPUT 5mV/div OUTPUT 1V/div MAX975/977 TOC27 100ns/div t PD- INPUT 5mV/div OUTPUT 1V/div PROPAGATION DELAY t PD- LOW-POWER MODE (V = +3V) CC INPUT 5mV/div OUTPUT 2V/div MAX975/977 TOC30 100ns/div t PD- ...
Page 9
... INPUT I 5mV/div np -100mV OUTPUT OUT 1V/div I CC MAX975/977 TOC33 100kHz RESPONSE LOW-POWER MODE (V = +5V GND MAX975/977 TOC32 2 s/div INPUT 5mV/div OUTPUT 2V/div MAX975 AUTO-STANDBY OPERATION 3V 0V 250 MAX975/977 TOC35 1ms/div C = 100pF STO_ INPUT 5mV/div OUTPUT 2V/div 9 ...
Page 10
... Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby _____________________________________________________________Pin Descriptions MAX975 PIN NAME 1 V Positive Supply Voltage, +2.7V to +5.25V CC 2 IN+ Noninverting Comparator Input 3 IN- Inverting Comparator Input Mode Status Pin. Indicates the operating mode. STAT is high for auto-standby mode or low-power 4 STAT mode, and during the transition to high-speed mode. STAT = low indicates that the comparator is in high-speed mode ...
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 ...
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
... This current creates a voltage across R voltage level crosses the voltage applied by the voltage divider to the inverting input, the output transitions. If the photodiode is not receiving enough signal to cause transitions on the MAX975’s output, STAT is used as a loss-of-signal indicator. R3 adds additional hysteresis for noise immunity. CMOS ...
Page 14
... V OTH V UTH The circuit shown in Figure 6 uses a MAX975 in a very low standby-power AM demodulator circuit that wakes up a toll tag (part of an automated roadway toll- collection system). This application requires very long standby times with brief and infrequent interrogations. In the awake state capable of demodulating the typical 600kHz AM carrier riding on the 2 ...
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. ...