DVI/HDMI 2:4 TMDS Fanout Switch and

Cable Driver

6

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Pin Description (continued)

PIN

NAME

FUNCTION

17, 20, 23,

27

IN2_A+,

IN2_B+,

IN2_C+,

IN2_D+

Noninverting TMDS, CML Input, Channel 2

18, 21, 24,

28

IN2_A-,

IN2_B-,

IN2_C-,

IN2_D-

Inverting TMDS, CML Input, Channel 2

30, 61, 65,

96

IN_SEL4,

IN_SEL3,

IN_SEL2,

IN_SEL1

Input Select, LVTTL Input. Force high to select input channel 1. Force low to select input channel 2.

Leave open to disable the output channel.

31, 62, 64,

95

PREEMPH4,

PREEMPH3,

PREEMPH2,

PREEMPH1

Preemphasis Select, LVTTL/LVCMOS Input. Force high for 6dB of output preemphasis. Leave open

for 3dB of output preemphasis. Force low for 0dB of output preemphasis (normal).

32, 46, 80,

94

HOTPLUG4,

HOTPLUG3,

HOTPLUG2,

HOTPLUG1

Hotplug Sense Input. Connect this pin to the display’s HOTPLUGx signal (buffered) to allow

automatic power-down of the associated output when the display is disconnected. A low-cost quad

5V, noninverting CMOS gate (74ACT32 series) is recommended to buffer the MAX3845 from the

33, 36, 39,

42, 45, 47,

50, 51, 54,

57, 60

GND2

Supply Ground. Ground connection for input channel 2 and output channels 3 and 4.

34, 37, 40,

43

OUT4_D-,

OUT4_C-,

OUT4_B-,

OUT4_A-

Inverting TMDS, CML Output, Channel 4

35, 38, 41,

44

OUT4_D+,

OUT4_C+,

OUT4_B+,

OUT4_A+

Noninverting TMDS, CML Output, Channel 4

48, 52, 55,

58

OUT3_D-,

OUT3_C-,

OUT3_B-,

OUT3_A-,

Inverting TMDS, CML Output, Channel 3

49, 53, 56,

59

OUT3_D+,

OUT3_C+,

OUT3_B+,

OUT3_A+,

Noninverting TMDS, CML Output, Channel 3