The DS3658 quad peripheral driver is designed for those applications where low operating
power, high breakdown voltage, high output current and low output ON voltage are required. A unique
input circuit combines TTL compatibility with high impedance. In fact, its extreme low input
current allows it to be driven directly by a CMOS device.
The outputs are capable of sinking 600 mA each and offer a 70V breakdown. However, for
inductive loads the output should be clamped to 35V or less to avoid latch-up during turn off
(inductive fly back protection—refer to AN-213 'SNOA610'). An on-chip clamp diode capable of handling 800 mA is provided at
each output for this purpose. In addition, the DS3658 incorporates circuitry that specifies
glitch-free power up or down operation and a fail-safe feature which puts the output in a high
impedance state when the input is open.
The PDIP package is specifically constructed to allow increased power dissipation over
conventional packages. The four ground pins are directly connected to the device chip with a
special cooper lead frame. When the quad driver is soldered into a PC board, the power rating of
the device improves significantly.
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