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MAX4822 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX4822 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 19 page General Description The MAX4822–MAX4825 8-channel relay drivers offer built-in kickback protection and drive +3V/+5V non- latching or dual-coil-latching relays. Each independent open-drain output features a 2.7 Ω (typ) on-resistance and is guaranteed to sink 70mA (min) of load current. These devices consume less than 300µA (max) quies- cent current and have 1µA output off-leakage current. A Zener-kickback-protection circuit significantly reduces recovery time in applications where switching speed is critical. The MAX4822/MAX4824 feature a unique power-save mode where the relay current, after activation, can be reduced to a level just above the relay hold-current threshold. This mode keeps the relay activated while significantly reducing the power consumption. The MAX4822/MAX4823 feature a 10MHz SPI™-/ QSPI™-/MICROWIRE™-compatible serial interface. Input data is shifted into a shift register and latched to the outputs when CS transitions from low to high. Each data bit in the shift register corresponds to a specific output, allowing independent control of all outputs. The MAX4824/MAX4825 feature a 4-bit parallel-input interface. The first 3 bits (A0, A1, A2) determine the out- put address, and the fourth bit (LVL) determines whether the selected output is switched on or off. 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- teresis (Schmidt trigger) on all digital inputs allows these devices to be used with slow-rising and falling signals, such as those from optocouplers or RC power- up initialization circuits. The MAX4822–MAX4825 are available in space-saving 4mm x 4mm, 20-pin thin QFN packages. They are specified over the -40°C to +85°C extended temperature range. Applications ATE Equipment DSL Redundancy Protection (ADSL/VDSL/HDSL) T1/E1 Redundancy Protection T3/E3 Redundancy Protection Industrial Equipment Test Equipment (Oscilloscopes, Spectrum Analyzers) Features ♦ Built-In Zener Kickback Protection for Fast Recovery ♦ Programmable Power-Save Mode Reduces Relay Power Consumption (MAX4822/MAX4824) ♦ 10MHz SPI-/QSPI-/MICROWIRE-Compatible Serial Interface ♦ Eight Independent Output Channels ♦ Drive +3V and +5V Relays ♦ Guaranteed 70mA (min) Coil Drive Current ♦ Guaranteed 5Ω (max) RON ♦ SET / RESET Functions to Turn On/Off All Outputs Simultaneously ♦ Serial Digital Output for Daisy Chaining ♦ Optional Parallel Interface (MAX4824/MAX4825) ♦ Low 300µA (max) Quiescent Supply Current ♦ Space-Saving, 4mm x 4mm, 20-Pin TQFN Package +3.3V/+5V, 8-Channel Relay Drivers with Fast Recovery Time and Power-Save Mode ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-3789; Rev 0; 8/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN- PACKAGE PACKAGE CODE MAX4822ETP -40°C to +85°C 20 TQFN-EP* T2044-3 MAX4823ETP -40°C to +85°C 20 TQFN-EP* T2044-3 MAX4824ETP -40°C to +85°C 20 TQFN-EP* T2044-3 MAX4825ETP -40°C to +85°C 20 TQFN-EP* T2044-3 *For maximum heat dissipation, packages have an exposed pad (EP) on the bottom. Solder exposed pad to GND. Pin Configurations appear at end of data sheet. SPI is a trademark of Motorola, Inc. QSPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. PART INTERFACE POWER SAVE MAX4822 Serial Yes MAX4823 Serial No MAX4824 Parallel Yes MAX4825 Parallel No Selector Guide |
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