MAX3841 Maxim, MAX3841 Datasheet - Page 4

• Manufacturer Part Number: MAX3841
• Description: The MAX3841 is a low-power, 12
• Manufacturer: Maxim

12.5Gbps CML 2 × 2 Crosspoint Switch
The MAX3841 contains a pair of CML inputs that drive
two 2:1 multiplexers, with separate select inputs SEL1
and SEL2, providing a 2 × 2 crosspoint data path. The
outputs of the multiplexers each drive a high-perfor-
mance CML output that can be disabled (powered
down) using the ENO1/ENO2 inputs. All of the data
paths are fully differential to minimize jitter, crosstalk,
and signal skew. See Figure 1 for the functional diagram.
The MAX3841 input and output buffers are terminated
with 50Ω to independent supply lines, and are also com-
patible with 100Ω differential terminations. (See Figures 3
and 4.) Separate power-supply connections are provided
for the core, input buffers, and output buffers to allow DC-
coupling to 1.8V, 2.5V, or 3.3V CML ICs. If desired, the
CML inputs and outputs can be AC-coupled.
4
_______________________________________________________________________________________
13, 24
14, 17
20, 23
1, 12
8, 11
PIN
2, 5
10
15
16
18
19
21
22
—
3
4
6
7
9
VCC1OUT
VCC2OUT
VCC1IN
VCC2IN
OUT1+
OUT2+
NAME
OUT1-
OUT2-
ENO1
ENO2
SEL1
SEL2
CML Input and Output Buffers
IN1+
IN2+
GND
IN1-
IN2-
V
EP
CC
Detailed Description
+3.3V Core Supply Voltage
Supply Voltage for CML Input IN1. Connect to 1.8V, 2.5V, or 3.3V.
Positive Serial Data Input 1, CML
Negative Serial Data Input 1, CML
Output 1 Select, LVCMOS Input. See Table 1.
Output 2 Select, LVCMOS Input. See Table 1.
Supply Voltage for CML Input IN2. Connect to 1.8V, 2.5V, or 3.3V.
Positive Serial Data Input 2, CML
Negative Serial Data Input 2, CML
Supply Ground
Supply Voltage for CML Output OUT1. Connect to 1.8V, 2.5V, or 3.3V.
Negative Serial Data Output 1, CML
Positive Serial Data Output 1, CML
Output 1 Enable, LVCMOS Input. See Table 1.
Output 2 Enable, LVCMOS Input. See Table 1.
Supply Voltage for CML Output OUT2. Connect to 1.8V, 2.5V, or 3.3V.
Negative Serial Data Output 2, CML
Positive Serial Data Output 2, CML
Exposed Pad. The exposed pad must be soldered to the circuit board ground for proper thermal and
electrical performance.
The CML inputs accept serial NRZ data with differential
amplitude from 150mV
The CML outputs provide 500mV
swing, resulting in low power consumption.
Figure 1. Functional Diagram
FUNCTION
IN1
IN2
2
2
MAX3841
CML
CML
P-P
to 1200mV
1
0
1
0
Pin Description
P-P
CML
CML
nominal differential
P-P
(see Figure 2).
2
2
OUT1
ENO1
SEL1
OUT2
ENO2
SEL2