MAX9404 Maxim, MAX9404 Datasheet - Page 6

• Manufacturer Part Number: MAX9404
• Description: The MAX9401/MAX9404 are extremely fast and low-skew quad ECL/PECL differential buffers/receivers for data and clock signals
• Manufacturer: Maxim

cables. External termination is required. See the Output
Termination section.
Setting EN = high and EN = low enables the outputs.
Setting EN = low and EN = high forces the outputs to a
differential low when disabled. All changes on CLK,
SEL, and IN_ are ignored.
Setting SEL = high and SEL = low enables four chan-
nels to operate independently as a buffer/receiver
(CLK is ignored). In asynchronous mode, the CLK sig-
Quad ECL/PECL Differential
Buffers/Receivers
Figure 1. MAX9401/MAX9404 Input and Output Configurations
Figure 2. Input Bias Circuits for Unused Pins for MAX9401/MAX9404
6
_______________________________________________________________________________________
IN_
IN_
MAX9401
IN_
IN_
Asynchronous Operation
100Ω
1kΩ
MAX9401
MAX9404
IN_
IN_
V
V
V
OUT_
OUT_
CC
EE
CC
MAX9404
MAX9401
Enable
100Ω
nal should be set to either logic low or high state to min-
imize noise coupling.
Setting SEL = low and SEL = high enables all four
channels to operate in synchronous mode. In this
mode, buffered inputs are clocked into flip-flops simul-
taneously on every rising edge of the differential clock
input (CLK and CLK).
The maximum differential input signal magnitude is 3.0V.
For interfacing to differential PECL signals, the V
range is from +3.0V to +5.5V (with V
interfacing to differential ECL, the V
-5.5V (with V
enced to V
depending on the level of the V
Unused inputs should be biased to avoid noise cou-
pling that might cause toggling at the unused outputs.
See Figure 2 for the biasing network.
Terminate the outputs through 50Ω to V
an equivalent Thevenin termination. Use identical termi-
nations on each OUT for the lowest skew. When a sin-
gle-ended signal is taken from a differential output,
terminate both outputs. For example, if OUT_ is used as
a single-ended output, terminate both OUT_ and OUT_.
IN_
IN_
1kΩ
100Ω
CC
CC
V
V
Applications Information
CC
and are considered PECL or ECL,
EE
Differential Signal Input Limit
grounded). Output levels are refer-
MAX9404
Synchronous Operation
Output Termination
CC
supply.
Supply Voltages
EE
EE
range is -3.0V to
CC
grounded). For
Input Bias
- 3.3V or use
CC