CMOS digital isolators Broadcom HCPL 902J supporting unidirectional and bidirectional data channels

Product Overview

The Broadcom HCPL-90xx and HCPL-09xx series are high-speed CMOS digital isolators designed for robust performance and excellent transient immunity. Featuring a symmetric magnetic coupling barrier, these isolators offer industry-leading speed with a typical pulse width distortion of 2 ns, propagation delay skew of 4 ns, and a data rate of 100 Mbaud. They are available in single-channel, dual-channel (unidirectional and bidirectional), and quad-channel configurations, providing high channel density for isolating data conversion devices, parallel buses, and peripheral interfaces. These devices are suitable for applications such as digital fieldbus isolation, multiplexed data transmission, computer peripheral interfaces, high-speed digital systems, isolated data interfaces, and logic level shifting. They are specified for operation over a wide temperature range of 40C to +100C.

Product Attributes

• Brand: Broadcom
• Technology: CMOS Digital Isolators
• Certifications: UL1577, IEC 61010-1
• ESD Sensitivity: Handle with normal static precautions
• Not for: or aerospace applications or environments

Technical Specifications

Power Consumption

Power consumption is frequency-dependent and independent of mark-to-space ratio. Approximate supply current per channel: I(Input) = 40(f/fmax)(1/4) mA, where f = operating frequency, fmax = 50 MHz.

Signal Status on Start-up and Shut Down

Designers should consider including an initialization signal due to potential ambiguous output states during power up, shutdown, or power loss sequencing.

Bypassing and PC Board Layout

Requires low ESR 47 nF ceramic capacitors for power supply decoupling. Ground planes for GND1 and GND2 are recommended for data rates above 10 Mb/s. Capacitors should be placed close to VDD pins.

Propagation Delay, Pulse Width Distortion, and Skew

Key parameters for signal integrity and data rate capability. Propagation delay measures signal transit time. Pulse Width Distortion (PWD) is the difference between high-to-low and low-to-high propagation delays. Propagation Delay Skew (tPSK) and Channel-to-Channel Skew (tCSK) are critical for parallel data transmission synchronization.