MAX4820/MAX4821 +3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface General Description Features The MAX4820/MAX4821 8-channel relay drivers offer 8 Independent Output Channels built-in kickback protection and drive +3.3V/+5V non- Built-In Inductive Kickback Protection latching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each inde- Drive +3V and +5V Relays pendent open-drain output features a 2 on-resistance Guaranteed 70mA (min) Coil Drive Current and is guaranteed to sink 70mA (min) of load current. Both devices consume less than 50A (max) quiescent SET Function to Turn On All Outputs current and have 1A output off-leakage current. Simultaneously The MAX4820 features an SPI-/QSPI-/MICROWIRE- RESET Function to Turn Off All Outputs compatible serial interface. Input data is shifted into an 8- Simultaneously bit shift register and latched to the outputs when CS transitions from low to high. Each data bit in the shift reg- SPI-/QSPI-/MICROWIRE-Compatible Serial ister corresponds to a specific output, allowing indepen- Interface (MAX4820) dent control of all outputs. Serial Digital Output for Daisy Chaining The MAX4821 features a 4-bit (A0, A1, A2, LVL) paral- (MAX4820) lel-input interface. The first three bits (A0, A1, A2) deter- mine the output address, and the fourth bit (LVL) Parallel Interface (MAX4821) determines whether the selected output is switched on Low 50A (max) Quiescent Supply Current or off. Data is latched to the outputs when CS transi- tions from low to high. Space-Saving 20-Pin Thin QFN Package Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simul- Ordering Information taneously with a single control line. Built-in hysteresis PART TEMP RANGE PIN-PACKAGE (Schmidt trigger) on all digital inputs allows this device MAX4820ETP+ -40C to +85C 20 Thin QFN-EP* to be used with slow rising and falling signals, such as those from optocouplers or RC power-up initialization MAX4820EUP+ -40C to +85C 20 TSSOP-EP* circuits. The MAX4820/MAX4821 are available in 20-pin MAX4821ETP+ -40C to +85C 20 Thin QFN-EP* TSSOP and space-saving 20-pin Thin QFN packages. MAX4821EUP+ -40C to +85C 20 TSSOP-EP* +Denotes a lead(Pb)-free/RoHS-compliant package. Applications Functional Diagrams *EP = Exposed pad. Central Office Pin Configurations ATE TOP VIEW DSL, ADSL Line Cards Industrial Equipment + E1/T1 Redundancy RESET 1 15 OUT3 CS 2 14 OUT4 13 COM DIN 3 MAX4820 Pin Configurations continued at end of data sheet. 12 OUT5 SCLK 4 Typical Application Circuits and Functional Diagrams *EP 11 OUT6 DOUT 5 appear at end of data sheet. Pin Configurations appear at end of data sheet. THIN QFN Functional Diagrams continued at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. *CONNECT EP TO GND. UCSP is a trademark of Maxim Integrated Products, Inc. MICROWIRE is a trademark of National Semiconductor Corp. For pricing, delivery, and ordering information, please contact Maxim Direct 19-2751 Rev 2 1/10 at 1-888-629-4642, or visit Maxims website at www.maxim integrated.com. Ordering Information AVAILABLE N.C. 6 20 SET 19 V GND 7 CC OUT8 8 18 OUT1 17 OUT2 OUT7 9 16 PGND PGND 10MAX4820/MAX4821 +3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) Continuous Power Dissipation (T = +70C) A V , COM..............................................................-0.3V to +6.0V 20-Lead Thin QFN (derate 16.9mW/C above +70C)..1350mW CC OUT ........................................................-0.3V to (V + 0.3V) (Note 1) ...............................................................59.3C/W COM JA CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V 20-Pin TSSOP (derate 21.7mW/C above +70C) .....1739mW DOUT..........................................................-0.3V to (V + 0.3V) (Note 1) ..................................................................46C/W CC JA Continuous OUT Current (all outputs turned on) ............150mA Operating Temperature Range ...........................-40C to +85C Continuous OUT Current (single output turned on) ........300mA Junction Temperature......................................................+150C Storage Temperature Range .............................-65C to +150C Soldering Temperature (10s)...........................................+300C Reflow Temperature.........................................................+260C Note 1: Package thermal resistances were obtained using the method described in JEDEC specifications. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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. ELECTRICAL CHARACTERISTICS (V = +3V to +5.5V, V = V , T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) CC COM CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage V 2.3 5.5 V CC V = 3.6V 15 50 CC I = 0A, OUT Quiescent Current I A Q logic inputs = 0V or V CC V = 5.5V 20 70 CC Thermal Shutdown 160 C Power-On Reset 0.8 1.5 2.2 V Power-On Reset Hysteresis 140 mV DIGITAL INPUTS (SCLK, DIN, CS, LVL, A0, A1, A2, RESET, SET) V = 3.3V 2.0 CC Input Logic-High Voltage V V IH V = 5V 2.4 CC V = 3.3V 0.6 CC Input Logic-Low Voltage V V IL V = 5V 0.8 CC Input Logic Hysteresis V 150 mV HYST Input Leakage Currents I Input voltages = 0V or 5.5V -1.0 0.01 +1.0 A LEAK C Input Capacitance C 5pF IN IN DIGITAL OUTPUT (DOUT) DOUT Low Voltage V I = 6mA 0.4 V OL SINK DOUT High Voltage V I = 0.5mA V - 0.5 V OH SOURCE CC RELAY OUTPUT DRIVERS (OUT1OUT8) V = 2.7V 70 CC OUT Drive Current mA V = 4.5V 70 CC OUT On-Resistance R V = 2.7V 2 6 ON CC OUT Voltage V V = 3.0V, I = 70mA 0.4 V OUT CC OUT I Off-Leakage Current I V = V , all outputs off -1 +1 A OUT LEAK OUT CC Kickback Diode Forward Voltage V I = 150mA (Note 3) 1.5 V FORW OUT 2 Maxim Integrated