MAX6974/MAX6975
24-Output PWM LED Drivers
for Message Boards
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Pin Description
PIN NAME FUNCTION
1 MUX0 Multiplex 0 Active-Low, Open-Drain Output. Use MUX0 to drive a pnp transistor.
2 CLKI+ PWM and Serial-Interface Noninverting Clock LVDS Input
3 CLKI- PWM and Serial-Interface Inverting Clock LVDS Input
4 DIN+ Serial-Interface Noninverting Data LVDS Input
5 DIN- Serial-Interface Inverting Data LVDS Input
6 LOADI Serial-Interface Load CMOS Input
7 I.C. Internally Connected. Connect to GND.
8–15 R0–R7 Red LED Drive Outputs. R0 to R7 are open-drain, constant-current sinks.
16–23 G0–G7 Green LED Drive Outputs. G0–G7 are open-drain, constant-current sinks.
24, 40 V
DD
Positive Supply Voltage. Bypass V
DD
to GND with a 0.1µF ceramic capacitor.
25 LOADO Serial-Interface Load CMOS Output
26 DOUT- Serial-Interface Inverting Data LVDS Output
27 DOUT+ Serial-Interface Noninverting Data LVDS Output
28 CLKO- PWM and Serial-Interface Inverting Clock LVDS Output
29 CLKO+ PWM and Serial-Interface Noninverting Clock LVDS Output
30 MUX1 Multiplex 1 Active-Low, Open-Drain Output. Use MUX1 to drive a pnp transistor.
31 AGND Analog Ground. Connect to GND.
32–39 B7–B0 Blue LED Drive Outputs. B0 to B7 are open-drain, constant-current sinks.
EP GND Power Ground. Exposed pad on package underside must be connected to GND.
