Datasheet

ULN2003LV
IN3
IN4
OUT1
OUT2
OUT3
OUT4
IN5
IN6
IN7
GND
OUT5
OUT6
OUT7
COM
IN1
IN2
Logic Inputs
(1.8V to 5V)
VSUP_MAX
VSUP1
VSUP2
VSUP3
VSUP _MAX
VSUP_MAX = Max of {VSUP1, VSUP2, VSUP3} – VF
VF = Diode forward drop@ Total ground-pin current
ULN2003LV
www.ti.com SLRS059A –APRIL 2012–REVISED APRIL 2012
Max Supply Selector
The Figure 4 implements a max supply selector along with a 4-channel logic level shifter using a single
ULN20003LV. This setup configures ULN2003LV’s channel clamp diodes OUT5 – OUT7 in a diode-OR
configuration and thus the maximum supply among VSUP1, VSUP2 and VSUP3 becomes available at the COM
pin. The maximum supply is then used as a pull-up voltage for level shifters. Limit the net GND pin current to
less than 100mA DC to ensure reliability of the conducting diode. The unconnected inputs IN5-IN7 are pulled to
GND potential through 300kΩ internal pull-down resistor.
Figure 4. ULN2003LV as Max Supply Selector
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Product Folder Link(s): ULN2003LV