MAX4822 Maxim, MAX4822 Datasheet
MAX4822
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MAX4822 Summary of contents
Page 1
... Data is latched to the outputs when CS transitions from low to high. The MAX4822–MAX4825 feature separate set and reset functions, allowing turn-on or turn-off of all outputs simultaneously with a single control line. Built-in hys- ...
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... Continuous OUT_ Current (single output turned on) ........300mA 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 ...
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... Power-Save On V (MAX4822) OUT_ Drive Voltage, V Power-Save On (MAX4824) OUT_ On-Resistance OUT_ Off-Leakage Current Zener Clamping Voltage V SPI TIMING (MAX4822/MAX4823) Turn-On Time (OUT_) Turn-Off Time (OUT_) SCLK Frequency Cycle Time Fall-to-SCLK Rise Setup CS Rise-to-SCLK Hold SCLK High Time SCLK Low Time ...
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... Fall Time (A2, A1, A0, LVL) t RESET Pulse Width SET Pulse Width CS Minimum Pulse Width t POWER-SAVE TIMING (MAX4822/MAX4824) Power-Save Delay Time Minimum PSAVE Low Time to t Power-Save Reset Note 1: Specifications at -40°C are guaranteed by design and not production tested. Note 2: Thermal shutdown disables power save from all channels to reduce power dissipation inside the device. ...
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Relay Drivers with Fast Recovery Time and Power-Save Mode (V = 3.3V +25°C, unless otherwise noted QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE 180 ALL CHANNELS OFF 175 170 165 160 155 150 145 140 ...
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... POWER-SAVE DELAY TIME vs. SUPPLY VOLTAGE 4. 0.1 F PSAVE 3.95 3.90 3.85 3.80 3.75 3.70 3.65 3.60 3.55 3.50 2.3 2.7 3.1 3.5 SUPPLY VOLTAGE (V) 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) OUT_ TURN-OFF DELAY TIME vs. SUPPLY VOLTAGE 1600 1400 1200 1000 800 600 400 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1 SUPPLY VOLTAGE (V) = 3.3V CC MAX4822-25 toc13 5V/div VOUT 2V/div 10 0.8 0.7 0.6 0.5 0.4 0.3 3.9 4.3 4.7 5.1 5.5 INPUT-LOGIC THRESHOLD vs. SUPPLY VOLTAGE 2.1 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 5.5 2.3 2.7 3.1 3.5 3.9 4.3 ...
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... Serial Data Input Serial Clock Input Serial Data Output. DOUT is the output of the shift register. DOUT can be used to daisy- chain multiple MAX4822/MAX4823 devices. The data at DOUT appears synchronous to SCLK’s falling edge. No Connection. Not internally connected. Ground Open-Drain Output 8 ...
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... OUT6 12 12 OUT5 8 _______________________________________________________________________________________ MAX4822/MAX4823 Pin Description (continued) FUNCTION Input Supply Voltage. Bypass V to GND with a 0.1µF capacitor. CC Set Input. Drive SET low to set all latches and registers high (all outputs are low impedance). SET overrides all parallel and serial control inputs. RESET overrides SET under all conditions ...
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... The MAX4822 consists of a 16-bit shift register and par- allel latch controlled by SCLK and CS. The input to the shift register is a 16-bit word. In the MAX4822, the first 8 bits determine the register address and are followed _______________________________________________________________________________________ ...
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... DIN delayed by eight clock cycles for the MAX4823 clock cycles for the MAX4822. When shifting the input data the first input bit in and out of the shift register for the MAX4822 device the first bit in or out of the shift register for D ...
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... For the MAX4822, if the number of data bits entered while CS is low is greater or less than 16, the shift regis- ter contains only the last 16 bits, regardless of when they were entered. For the MAX4823, if the number of data bits entered while CS is low is greater or less than 8, the shift register contains only the last 8 data bits, regardless of when they were entered ...
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... Figure 8). During operation, a stream of serial data is shifted through the MAX4822/ MAX4823 devices in series. When CS goes high, all outputs update simultaneously. The MAX4822/MAX4823 can also be used in a slave configuration that allows individual addressing of devices. Connect all the DIN inputs together, and use 12 ...
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... In the daisy-chain configuration of Figure 10, the n-channel MOSFET drives PSAVE low. When the n-channel MOSFET is turned off, PSAVE is pulled high by an internal 35µA pullup in each MAX4822, and the power-save mode is enabled. Because of the paralleled PSAVE pullup currents, the required size of the n-channel MOSFET depends upon the number of MAX4822 devices in the chain ...
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... PSAVE SCLK 0.47 F OUT8 CS GND PGND SCLK CS Figure 9. Daisy-Chained MAX4822s with a Capacitor Connected to PSAVE where N is the total number of MAX4822 devices in a single chain, and R is the on-resistance of the ON n-channel MOSFET in s. For example 10: R < 142 ON An n-channel MOSFET with R ON required for a daisy chain of 10 MAX4822 devices ...
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... Relay Drivers with Fast Recovery Time and Power-Save Mode DIN DIN MAX4822 PSAVE SCLK SCLK N CS Figure 10. Daisy-Chaining MAX4822s with a PSAVE Connected to an n-Channel MOSFET ______________________________________________________________________________________ 0 DOUT DIN MAX4822 OUT1 PSAVE SCLK OUT8 GND ...
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... Relay Drivers with Fast Recovery Time and Power-Save Mode MAX4822/MAX4823 Functional Diagram (Serial Interface MAX4822 MAX4823 RESET SET DIN SHIFT REGISTER DOUT SCLK CS PSAVE GND MAX4822 ONLY 16 ______________________________________________________________________________________ POWER- ON RESET PSAVE POWER-SAVE CONFIGURATION REGISTER ON1 CONTROL ON2 REGISTER ...
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Relay Drivers with Fast Recovery Time and Power-Save Mode MAX4824/MAX4825 Functional Diagram (Parallel Interface MAX4824 MAX4825 RESET SET LVL A2 4-TO-8 DECODER PSAVE GND MAX4824 ONLY ______________________________________________________________________________________ PSAVEON/OFF ON1 CONTROL ON2 REGISTER ON3 ...
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... Relay Drivers with Fast Recovery Time and Power-Save Mode TOP VIEW RESET DIN 3 MAX4822 SCLK 4 DOUT 5 THIN QFN RESET LVL 3 MAX4824 THIN QFN 18 ______________________________________________________________________________________ 15 OUT3 RESET 1 14 OUT4 PSAVE DIN 3 12 OUT5 SCLK 4 11 ...
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... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © ...