The ISO774x devices are high-performance, quad-channel digital isolators with 5000 VRMS (DW package)
and 3000 VRMS (DBQ package) isolation ratings per UL 1577. This
family includes devices with reinforced insulation ratings according to VDE,
CSA, TUV and CQC. The
ISO7741B device is designed for applications that require basic insulation ratings only.
The ISO774x devices provide high
electromagnetic immunity and low emissions at low power consumption, while isolating CMOS or LVCMOS
digital I/Os. Each isolation channel has a logic input and output buffer separated by a double
capacitive silicon dioxide (SiO2) insulation barrier.
These devices come with enable pins which can
be used to put the respective outputs in high impedance for multi-master driving applications and
to reduce power consumption. The ISO7740 device has all four channels in
the same direction, the ISO7741 device has three
forward and one reverse-direction channels, and the ISO7742 device has two forward and two reverse-direction
channels. If the input power or signal is lost, default output is high for devices without suffix F and low for devices with suffix F. See the Device Functional Modes section for further
Used in conjunction with isolated power supplies, these devices help prevent noise
currents on data buses, such as RS-485, RS-232, and CAN, or other circuits from entering the local ground and interfering
with or damaging sensitive circuitry. Through innovative chip design and layout techniques,
electromagnetic compatibility of the ISO774x devices have been
significantly enhanced to ease system-level ESD, EFT, surge, and emissions compliance. The
are available in 16-pin
SOIC and QSOP packages.