Rainbow-electronics MAX6975 Manual do Utilizador descarregar pdf (Página 3)

MAX6974/MAX6975

24-Output PWM LED Drivers

for Message Boards

_______________________________________________________________________________________ 3

Note 1: All parameters tested at T

= +85°C. Specifications over temperature are guaranteed by design.

Note 2: Specification limits apply to devices at the same T

for T

= T

MIN

to T

MAX

Note 3: Guaranteed by design.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Output Slew Time LOADO 20% to 80%, 80% to 20%, load = 10pF 3 ns

Output Low Voltage MUX_ V

OLM

SINK

= 40mA 0.4 V

Open-Circuit Detection V

OCD

200 mV

Output Voltage Slew Time

R0–R7, G0–G7, B0–B7

80% to 20%, load = 50pF,

calibration DACs set to 0xFF

100 ns

= +85°C 28 30 32

Full-Scale Port Output Current

R0–R7, G0–G7, B0–B7

SINKFS

= 3.3V, V

= 1.2V,

calibration DACs set to 0xFF

= T

MIN

to T

MAX

26 34

= +125°C

(Note 3)

±0.7 2.7

= +85°C ±0.7 2

Port-to-Port Current Matching

R0–R7, G0–G7, B0–B7

ΔI

SINK

= 3.3V, V

= 1.2V,

calibration DACs set to 0xFF

SINK

= 30mA (Note 2)

= -40°C

(Note 3)

±0.9 3.3

= +85°C 0.3 1.15

Output Load Regulation ΔI

OLR

D D

= 3.3V , V

= 1.2V to 3.0V ,

calibration DACs set to 0x80,

SINK

= 18mA

= T

MIN

to T

MAX

1.5

mA/V

= +85°C 0.6 1.7

Output Power-Supply Rejection ΔI

OPSR

D D

= 3.0 V to 3.6V , V

= 1.2V ,

calibration DACs set to 0x80,

SINK

= 18mA

= T

MIN

to T

MAX

2.0

mA/V

ELECTRICAL CHARACTERISTICS (continued)

= 3.0V to 3.6V, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V

= 3.3V, T

= +85°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CLKI_ Input Frequency f

CLKI

33 MHz

CLKI_ Duty Cycle 40 60 %

CLKO_ Output Delay t

PD-CLKO

16 ns

DIN_ Setup Time t

SU-DIN

0.5 ns

DIN_ Hold Time t

HD-DIN

5ns

DOUT_ Output Delay t

PD-DOUT

15 ns

LOADO Output Delay t

PD-LOADO

18 ns

LOADI Hold Time t

HD-LOADI

8ns

Watchdog Period When enabled 40 125 300 ms

TIMING CHARACTERISTICS

= 3.0V to 3.6V, T

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at 3.3V, T

= +85°C.) (Note 1)

1 2 3 4 5 6 7 8 ... 22 23

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