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MAX4821ETP Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX4821ETP Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page General Description The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3.3V/+5V non- latching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each inde- pendent open-drain output features a 2Ω on-resistance and is guaranteed to sink 70mA (min) of load current. Both devices consume less than 50µA (max) quiescent current and have 1µA output off-leakage current. The MAX4820 features an SPI™-/QSPI™-/MICROWIRE™- compatible serial interface. Input data is shifted into an 8- bit shift register and latched to the outputs when CS transitions from low to high. Each data bit in the shift reg- ister corresponds to a specific output, allowing indepen- dent control of all outputs. The MAX4821 features a 4-bit (A0, A1, A2, LVL) paral- lel-input interface. The first three bits (A0, A1, A2) deter- mine the output address, and the fourth bit (LVL) determines whether the selected output is switched on or off. Data is latched to the outputs when CS transi- tions from low to high. Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simul- taneously with a single control line. Built-in hysteresis (Schmidt trigger) on all digital inputs allows this device to be used with slow rising and falling signals, such as those from optocouplers or RC power-up initialization circuits. The MAX4820/MAX4821 are available in 20-pin TSSOP and space-saving 20-pin Thin QFN packages. Applications Central Office ATE DSL, ADSL Line Cards Industrial Equipment E1/T1 Redundancy Features o 8 Independent Output Channels o Built-In Inductive Kickback Protection o Drive +3V and +5V Relays o Guaranteed 70mA (min) Coil Drive Current o SET Function to Turn On All Outputs Simultaneously o RESET Function to Turn Off All Outputs Simultaneously o SPI-/QSPI-/MICROWIRE-Compatible Serial Interface (MAX4820) o Serial Digital Output for Daisy Chaining (MAX4820) o Parallel Interface (MAX4821) o Low 50µA (max) Quiescent Supply Current o Space-Saving 20-Pin Thin QFN Package +3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface ________________________________________________________________ Maxim Integrated Products 1 TOP VIEW *CONNECT EP TO GND. *EP 13 12 11 14 15 OUT5 COM OUT4 OUT3 OUT6 4 3 2 1 SCLK DIN CS RESET 5 DOUT MAX4820 THIN QFN Pin Configurations Ordering Information 19-2751; Rev 1; 4/09 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. * EP = Exposed pad. Pin Configurations continued at end of data sheet. Typical Application Circuits and Functional Diagrams appear at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. PART TEMP RANGE PIN-PACKAGE MAX4820ETP -40°C to +85°C 20 Thin QFN-EP* MAX4820EUP -40°C to +85°C 20 TSSOP MAX4821ETP -40°C to +85°C 20 Thin QFN-EP* MAX4821EUP -40°C to +85°C 20 TSSOP |
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