Datasheet

MAX3845
DVI/HDMI 2:4 TMDS Fanout Switch and
Cable Driver
6 _______________________________________________________________________________________
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
HOTPLUGx pin to match HOTPLUG level specifications. If this feature is not used, connect to V
CC
.
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