
MAX3981
3.125Gbps XAUI Quad Cable Equalizer
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5
Pin Description
PIN
NAME
FUNCTION
1, 5, 9, 13,
23, 27, 31, 35
VCC
+3.3V Supply Voltage
4, 8, 12, 16,
26, 30, 34, 38
GND
Supply Ground
2
IN1+
Positive Equalizer Input Channel 1, CML
3
IN1-
Negative Equalizer Input Channel 1, CML
6
IN2+
Positive Equalizer Input Channel 2, CML
7
IN2-
Negative Equalizer Input Channel 2, CML
10
IN3+
Positive Equalizer Input Channel 3, CML
11
IN3-
Negative Equalizer Input Channel 3, CML
14
IN4+
Positive Equalizer Input Channel 4, CML
15
IN4-
Negative Equalizer Input Channel 4, CML
17–22, 39–42
N.C.
No Connection. Leave unconnected.
24
OUT4-
Negative Equalizer Output Channel 4, CML
25
OUT4+
Positive Equalizer Output Channel 4, CML
28
OUT3-
Negative Equalizer Output Channel 3, CML
29
OUT3+
Positive Equalizer Output Channel 3, CML
32
OUT2-
Negative Equalizer Output Channel 2, CML
33
OUT2+
Positive Equalizer Output Channel 2, CML
36
OUT1-
Negative Equalizer Output Channel 1, CML
37
OUT1+
Positive Equalizer Output Channel 1, CML
43
EN
Enable Equalizer Input. A TTL high selects normal operation. A TTL low selects low-power standby
mode.
44
SDET
Signal Detect Output for Channel 1. Produces a TTL high output when a signal is detected.
—
EP
Exposed Pad. The exposed pad must be soldered to the circuit board ground plane for proper
thermal and electrical performance.