MAX6974/MAX6975
24-Output PWM LED Drivers
for Message Boards
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
(All voltages with respect to GND.)
V
DD
........................................................................-0.3V to +4.0V
R0–R7, G0–G7, B0–B7, MUX0, and MUX1 ...........-0.3V to +8.0V
All Other Pins..............................................-0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
40-Pin TQFN (derate 37mW/°C over +70°C) .............2963mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage V
DD
3.0 3.6 V
LEDs Anode Voltage
(R0–R7, G0–G7, B0–B7, MUX0,
and MUX1)
V
O
7V
f
CLKI
= 0Hz; CLKO_, DOUT_ loaded 200Ω;
calibration DACs set to 0x01
28 52
f
CLKI
= 0Hz; CLKO_, DOUT_ loaded 200Ω;
calibration DACs set to 0xFF
51 72
Supply Current I
DD
f
CLKI
= 32MHz; CLKO_, DOUT_ loaded 200Ω;
calibration DACs set to 0xFF
54 77
mA
Input High Voltage LOADI V
IHC
0.7
x V
DD
V
Input Low Voltage LOADI V
ILC
0.3
x V
DD
V
Differential Input Voltage Range
CLKI_, DIN_
V
ID
±0.15 ±1.20 V
Common-Mode Input Voltage
CLKI_, DIN_
V
CM
| V
I D
/ 2| 2.4 V
Differential Input High Threshold VDIFF
TH
8 100 mV
Differential Input Low Threshold VDIFF
TL
-100 -8 mV
Differential Output Voltage
CLKO_, DOUT_
V
OD
Termination 200Ω at receiver _+ and _- inputs ±190 ±550 mV
Differential Output Offset
CLKO_, DOUT_
V
OS
Termination 200Ω at receiver _+ and _- inputs 1.125 1.25 1.375 V
Input Leakage Current
CLKI_, DIN_, LOADI
I
IH
, I
IL
-1 +1 µA
Input Capacitance
CLKI_, DIN_, LOADI
10 pF
Output Low Voltage LOADO V
OLC
I
SINK
= 5mA 0.05 0.25 V
Output High Voltage LOADO V
OHC
I
SOURCE
= 5mA
V
DD
- 0.5
V
DD
- 0.2
V
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.0V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
DD
= 3.3V, T
A
= +85°C.) (Note 1)
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