KAWASAKI, Japan—Toshiba Electronic Devices & Storage Corporation ("Toshiba") has launched high-speed quad-channel digital isolators, the “DCL54xx01 Series,” that feature 100kV/μs (min) of high common mode transient immunity (CMTI) and a 150Mbps high-speed data rate. Volume shipments of the six products in the series start today.
Ensuring the safety and reliability of factory automation equipment requires isolation devices that ensure insulation and prevent noise propagation. Toshiba is now offering digital isolators as a solution that address requirements for higher speed and multi-channel signal communications and high CMTI.
The new products use Toshiba’s proprietary magnetic coupling type insulated transmission method to deliver a high CMTI of 100kV/μs (min) ^[1] . This realizes high tolerance of electrical noise between input/output in isolated signal communications, and also contributes to stable control signal transmission and equipment operation. With their low pulse width distortion of 0.8ns (typ.) [2] and high-speed data rate of 150Mbps (max), the digital isolators are suitable for multi-channel high-speed communications applications such as I/O interfaces with SPI communications.
Toshiba has provided its customers with photocouplers, isolation devices that ensure insulation through optical coupling, for 50 years now. Going forward, in addition to photocouplers, the company will expand its lineup of high-speed quad-channel digital isolators, plus the number of channels and packages, and offer high-quality insulation devices that support the reliable, real-time data transmission required for industrial equipment control.
Toshiba Standard Digital Isolators have a structure that uses oxide film in the chip to insulate them. Therefore, the isolation life of the standard digital isolator can be predicted by applying the same concept as MOSFET gate-oxide breakdown over time (TDDB : Time Dependent Dielectric Breakdown ^{[Note 1]} ).
"Magnetic and capacitive coupler for basic and reinforced insulation" ^{[Note 2]} has been standardized by the International Safety Standards under standard number IEC 60747-17: 2020 Ed. 1 and VDE V 0884-11, and the aforementioned TDDB test conditions have been defined.
The DCL54x01 series complies with VDE V 0884-11 standards by applying for reinforced isolation to the maximum operating isolation voltage V _IORM=1.0kVrms ^{[Note 3]}. TDDB test is conducted at 1.2kVrms, a factor of safety (1.2) multiplied by the above V _IORM required for reinforced isolation. Also, the life determination point is 37.5 years ^{[Note 4]} @ 1.2kVrms on the extrapolation line of 1ppm defect rate required for reinforced isolation.
As a reference, in addition to testing the rated life required at a minimum for the above VDE qualification, we predict an isolation life of 70 years or more, exceeding the VDE specifications, under accelerated conditions of the test voltage.
Features
• High common mode transient immunity: CMTI=100kV/μs (min)
• high-speed data rate: tbps=150Mbps (max)
• Low pulse width distortion: PWD=0.8ns (typ.) (VDD1=VDD2=5V)
• Quad-channel:
Four channel of forward directions and zero channel of reverse direction
Three channel of forward directions and one channel of reverse direction