MAX395 Maxim, MAX395 Datasheet - Page 13

• Manufacturer Part Number: MAX395
• Description: The MAX395 8-channel, serially controlled, single-pole/single-throw (SPST) analog switch offers eight separately controlled switches
• Manufacturer: Maxim

To use the MAX395 as an 8x1 multiplexer, connect all
common pins together (COM0–COM7) to form the mux
output; the mux inputs are NO0–NO7.
The mux can be programmed normally, with only one
channel selected for every eight clock pulses, or it can
be programmed in a fast mode, where channel chang-
ing occurs on each clock pulse. In this mode, the chan-
nels are selected by sending a single high pulse
(corresponding to the selected channel) at DIN, and a
corresponding CS low pulse for every eight clock puls-
es. As this is clocked through the register by SCLK,
each switch sequences one channel at a time, starting
with Channel 7.
Figure 3. Connections for Microwire
Figure 5. Daisy-Chained Connection
THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE
MAX395, BUT MAY BE USED FOR DATA-ECHO PURPOSES.
SCLK
DIN
CS
MAX395
DOUT
SCLK
______________________________________________________________________________________
DIN
CS
SCLK
DIN
CS
MAX395
SK
SO
SI
I/O
DOUT
8x1 Multiplexer
Serially Controlled, Low-Voltage,
MICROWIRE
PORT
SCLK
DIN
CS
MAX395
8-Channel SPST Switch
DOUT
To use the MAX395 as a dual (4x2) mux, connect
COM0–COM3 together and connect COM4–COM7
together, forming the two outputs. The mux input pairs
become NO0/NO4, NO1/NO5, NO2/NO6, and NO3/NO7.
The mux can be programmed normally, with only one
differential channel selected for every eight clock puls-
es, or it can be programmed in a fast mode, where
channel changing occurs on each clock pulse.
In fast mode, the channels are selected by sending two
high pulses spaced four clock pulses apart (corre-
sponding to the two selected channels) at DIN, and a
corresponding CS low pulse for each of the first eight
clock pulses. As this is clocked through the register by
Figure 4. Connections for SPI and QSPI
Dual, Differential 4-Channel Multiplexer
THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE
MAX395, BUT MAY BE USED FOR DATA-ECHO PURPOSES.
MAX395
SCLK
DIN
CS
DOUT
SCLK
MAX395
DIN
CS
DOUT
CPOL = 0, CPHA = 0
MISO
MOSI
SCK
I/O
TO OTHER
SERIAL DEVICES
PORT
SPI
13