Maxim: extended digital IO family addresses Industry 4.0 challenges

Designers of industrial equipment striving to meet the size, power and performance requirements of Industry 4.0 applications can now turn to an expanded family of digital input devices from Maxim Integrated Products. One of the new devices, MAX22192, is integrated into the company's Go-IO programmable logic controller reference design.

As manufacturing becomes increasingly automated, there is a stronger need for real-time decision-making and feedback-loop mechanisms. These intelligent Industry 4.0 systems require digital input ICs inside the PLCs to receive on/off status signals. Yet, for ease of integration throughout manufacturing environments, the devices must be robust, high-performing and compact.

Maxim's expanded portfolio of IEC61131-2-compliant digital input devices offers the industry's smallest solution size (by as much as 50%), features the lowest power dissipation (by as much as 60%), is up to 6x faster and has the most robust performance (integrating 1kV of surge protection and integrated diagnostics). In addition, the family also includes a parasitically powered digital input that reduces power dissipation by up to 60 percent and does not require a discrete isolated power supply.

The newest digital input devices include:

•            MAX22190 8-channel octal digital input with Serial Peripheral Interface (SPI), accurate input current limiters, built-in surge protection of >1kV and wire break detection in a 5mm x 5mm package

•            MAX22191 single-channel, parasitically powered digital input with accurate input current limiters and 250ns (max) propagation delay in a 2.8mm x 2.9mm package

•            MAX22192 8-channel octal digital input with isolated SPI, wire break detection and accurate input current limiters in a 6mm x 10mm package

•            MAX22195 high-speed octal digital input with parallel output and accurate input current limiters, 300ns (max) propagation delay, parallel interface, low power, low heat dissipation, fault tolerance with built-in diagnostics, configurability and a robust design in a 5mm x 5mm 32-TQFN package

These products enhance a digital IO family that also includes the MAX14912 and MAX14913 octal high-speed, switch/push-pull driver with integrated surge protection, diagnostics and fast/safe demagnetization; the MAX14914 universal digital IO with surge protection, high-side switch/push-pull driver/digital input and an SPI interface; and the MAX14483 6-channel, high-density, high-speed, low-power digital isolator optimized for daisy chained SPI applications.

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