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+3.3V/+5V, 8-Channel, Relay Drivers with Fast Recovery Time and Power-Save Mode

Octal Relay Drivers for Non-Latching Relays or Dual-Coil Latching Relays

Product Details

The MAX4822–MAX4825 8-channel relay drivers offer built-in kickback protection and drive +3V/+5V nonlatching or dual-coil-latching relays. Each independent open-drain output features a 2.7Ω (typ) on-resistance and is guaranteed to sink 70mA (min) of load current. These devices consume less than 300µA (max) quiescent 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 active-low 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 output address, and the fourth bit (LVL) determines whether the selected output is switched on or off. Data is latched to the outputs when active-low 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 hysteresis (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.

Key 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
  • Active-Low SET/Active-Low 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

Applications/Uses

  • ATE Equipment
  • DSL Redundancy Protection (ADSL/VDSL/HDSL)
  • Industrial Equipment
  • T1/E1 Redundancy Protection
  • T3/E3 Redundancy Protection
  • Test Equipment (Oscilloscopes, Spectrum Analyzers)
Parametric specs for Relay Drivers
ISOURCE @2.7V (mA) (guar. min) 70
RON @2.7V (Ω) (max) 6
IQ (µA) (max) 160
# Channels 8
Interface SPI
VSUPPLY (V) 2.3 to 5.5
Package/Pins TQFN/20
Budgetary
Price (See Notes)
$2.63 @1k
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Simplified Block Diagram

MAX4822, MAX4823, MAX4824, MAX4825: Pin Configurations MAX4822, MAX4823, MAX4824, MAX4825: Pin Configurations Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX4824PMB1 peripheral module provides the necessary hardware to interface the MAX4824 8-channel relay driver to any system that utilizes Pmod™-compatible expansion ports configurable for GPIO communication. Each independent channel in the IC features a 2.7Ω (typ) on-resistance and is guaranteed to sink 70mA (min) of load current. A zener kickback-protection circuit significantly reduces recovery time in applications where switching speed is critical. When driving relays, a unique power-save mode allows relay current to be reduced to a level just above the relay hold-current threshold. This mode keeps the relay activated while significantly reducing the power consumption.

Refer to the MAX4824 IC data sheet for detailed information regarding operation of the IC.

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Features

  • Eight Independent Output Channels Capable of 70mA Sink Current
  • Guaranteed 5Ω (max) RON
  • Drive Eight Relays (or Other Loads) Independently
  • 4-Bit Parallel Interface (SPI Version of IC also Available)
  • 12-Pin Pmod-Compatible Connector (GPIO)
  • Example Software Written in C for Portability
  • RoHS Compliant
  • Proven PCB Layout
  • Fully Assembled and Tested

Description

Maxim Analog Essentials is a collection of peripheral modules which can plug directly into any FPGA/CPU expansion port which follows the Pmod™ standard established by Digilent, Inc. The collection includes modules containing a wide variety of commonly used analog and mixed signal functions. The modules are supported by software which includes FPGA configuration files for three popular FPGA platforms: Avnet LX-9, Digilent Nexys 3 and Avnet ZEDBoard, as well as example programs to exercise and demonstrate each module. While the example programs demonstrate the module’s functionality, they are well partitioned and documented allowing the core routines to be easily cut and pasted into your own programs. The combination of plug-in simplicity and easy software integration allows for quick migration from idea to working prototype.

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Features

  • Data Converter, Interface, Clock, Sensor, and Other Modules Included to Address Many Design Needs
  • Plug in Modules Enable Rapid Hardware Prototyping
  • Proven Software Drivers Reduce Development Time
  • FPGA Configuration Files Included to Simplify Design Effort

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Parameters

Parametric specs for Relay Drivers
ISOURCE @2.7V (mA) (guar. min) 70
RON @2.7V (Ω) (max) 6
IQ (µA) (max) 160
# Channels 8
Interface SPI
VSUPPLY (V) 2.3 to 5.5
Package/Pins TQFN/20
Budgetary
Price (See Notes)
$2.63 @1k

Key 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
  • Active-Low SET/Active-Low 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

Applications/Uses

  • ATE Equipment
  • DSL Redundancy Protection (ADSL/VDSL/HDSL)
  • Industrial Equipment
  • T1/E1 Redundancy Protection
  • T3/E3 Redundancy Protection
  • Test Equipment (Oscilloscopes, Spectrum Analyzers)

Description

The MAX4822–MAX4825 8-channel relay drivers offer built-in kickback protection and drive +3V/+5V nonlatching or dual-coil-latching relays. Each independent open-drain output features a 2.7Ω (typ) on-resistance and is guaranteed to sink 70mA (min) of load current. These devices consume less than 300µA (max) quiescent 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 active-low 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 output address, and the fourth bit (LVL) determines whether the selected output is switched on or off. Data is latched to the outputs when active-low 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 hysteresis (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.

Simplified Block Diagram

MAX4822, MAX4823, MAX4824, MAX4825: Pin Configurations MAX4822, MAX4823, MAX4824, MAX4825: Pin Configurations Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal