MAX4821EUP

MAX4821EUP Datasheet

MAX4820/MAX4821

Part	Datasheet
MAX4821EUP	MAX4821EUP (pdf)

PDF Datasheet Preview
MAX4820/MAX4821 +3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3.3V/+5V nonlatching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each independent open-drain output features a 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 8bit 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 MAX4821 features a 4-bit A0, A1, A2, LVL parallel-input interface. The first three bits A0, A1, A2 determine 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 transitions from low to high. Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simultaneously 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. Central Office DSL, ADSL Line Cards Industrial Equipment E1/T1 Redundancy Pin Configurations continued at end of data sheet. Typical Application Circuits and Functional Diagrams appear at end of data sheet. 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 Ordering Information 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 *For maximum heat dissipation, packages have an exposed pad EP on the bottom. Solder exposed pad to GND. Pin Configurations TOP VIEW 20 SET 19 VCC 18 OUT1 17 OUT2 16 PGND RESET 1 CS 2 DIN 3 SCLK 4 DOUT 5 MAX4820 15 OUT3 14 OUT4 13 COM 12 OUT5 11 OUT6 N.C. 6 GND 7 OUT8 8 OUT7 9 PGND 10 SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. THIN QFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at MAX4820/MAX4821 +3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND. VCC, to +6.0V to VCOM + 0.3V CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V to VCC + 0.3V Continuous OUT_ Current all outputs turned on ............150mA Continuous OUT_ Current single output turned on ........300mA Continuous Power Dissipation TA = +70°C 20-Lead Thin QFN derate 16.9mW/°C above +70°C .................................1350mW 20-Pin TSSOP derate 21.7mW/°C above +70°C .................................1739mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Storage Temperature Range .............................-65°C to +150°C Soldering Temperature 10s 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 VCC = +3V to +5.5V, VCOM = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1 PARAMETER CONDITIONS Operating Voltage Quiescent Current IOUT_ = 0, VCC = 3.6V logic inputs = 0 or VCC = 5.5V Thermal Shutdown Power-On Reset Power-On Reset Hysteresis DIGITAL INPUTS SCLK, DIN, CS, LVL, A0, A1, A2, RESET, SET Input Logic High Voltage Input Logic Low Voltage Input Logic Hysteresis VIH VIL VHYST VCC = 3.3V VCC = 5V VCC = 3.3V VCC = 5V Input Leakage Currents CIN Input Capacitance ILEAK CIN Input voltages = 0 or 5.5V DIGITAL OUTPUT DOUT DOUT Low Voltage DOUT High Voltage VOL VOH ISINK = 6mA ISOURCE = 0.5mA RELAY OUTPUT DRIVERS OUT_ Drive Current OUT_ On-Resistance VCC = 2.7V VCC = 4.5V VCC = 2.7V OUT_ Voltage VOUT_ VCC = 3.0V, IOUT_ = 70mA IOUT Off-Leakage Current ILEAK VOUT_ = VCC, all outputs off MIN TYP MAX UNITS VCC -

PDF Datasheet Preview

MAX4820/MAX4821
+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface

The MAX4820/MAX4821 8-channel relay drivers offer built-in kickback protection and drive +3.3V/+5V nonlatching or dual-coil-latching relays. These devices are especially useful when driving +3V relays. Each independent open-drain output features a 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 8bit 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 MAX4821 features a 4-bit A0, A1, A2, LVL parallel-input interface. The first three bits A0, A1, A2 determine 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 transitions from low to high. Both devices feature separate set and reset functions that allow the user to turn on or turn off all outputs simultaneously 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.

Central Office

DSL, ADSL Line Cards

Industrial Equipment

E1/T1 Redundancy

Pin Configurations continued at end of data sheet.

Typical Application Circuits and Functional Diagrams appear at end of data sheet.
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
Ordering Information

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
*For maximum heat dissipation, packages have an exposed pad EP on the bottom. Solder exposed pad to GND.

Pin Configurations

TOP VIEW
20 SET 19 VCC 18 OUT1 17 OUT2 16 PGND

RESET 1 CS 2 DIN 3

SCLK 4 DOUT 5

MAX4820
15 OUT3 14 OUT4 13 COM 12 OUT5 11 OUT6

N.C. 6 GND 7 OUT8 8 OUT7 9 PGND 10

SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

THIN QFN

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at

MAX4820/MAX4821
+3.3V/+5V, 8-Channel, Cascadable Relay Drivers with Serial/Parallel Interface

ABSOLUTE MAXIMUM RATINGS

All voltages referenced to GND. VCC, to +6.0V to VCOM + 0.3V CS, SCLK, DIN, SET, RESET, A0, A1, A2, LVL......-0.3V to +6.0V to VCC + 0.3V Continuous OUT_ Current all outputs turned on ............150mA Continuous OUT_ Current single output turned on ........300mA

Continuous Power Dissipation TA = +70°C 20-Lead Thin QFN
derate 16.9mW/°C above +70°C .................................1350mW
20-Pin TSSOP derate 21.7mW/°C above +70°C .................................1739mW

Operating Temperature Range ...........................-40°C to +85°C Junction Temperature Storage Temperature Range .............................-65°C to +150°C Soldering Temperature 10s

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

VCC = +3V to +5.5V, VCOM = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1

PARAMETER

CONDITIONS

Operating Voltage

Quiescent Current

IOUT_ = 0,

VCC = 3.6V
logic inputs = 0 or VCC = 5.5V

Thermal Shutdown

Power-On Reset

Power-On Reset Hysteresis DIGITAL INPUTS SCLK, DIN, CS, LVL, A0, A1, A2, RESET, SET

Input Logic High Voltage Input Logic Low Voltage Input Logic Hysteresis

VIH VIL VHYST

VCC = 3.3V VCC = 5V VCC = 3.3V VCC = 5V

Input Leakage Currents CIN Input Capacitance

ILEAK CIN

Input voltages = 0 or 5.5V

DIGITAL OUTPUT DOUT

DOUT Low Voltage DOUT High Voltage

VOL VOH

ISINK = 6mA ISOURCE = 0.5mA

RELAY OUTPUT DRIVERS

OUT_ Drive Current OUT_ On-Resistance

VCC = 2.7V VCC = 4.5V VCC = 2.7V

OUT_ Voltage

VOUT_ VCC = 3.0V, IOUT_ = 70mA

IOUT Off-Leakage Current

ILEAK VOUT_ = VCC, all outputs off

MIN TYP MAX UNITS

VCC -

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Datasheet ID: MAX4821EUP 647356