Datasheet

MAX395
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
12 ______________________________________________________________________________________
Addressable Serial Interface
When several serial devices are configured as slaves,
addressable by the processor, DIN pins of each
decode logic individually control CS of each slave
device. When a slave is selected, its CS pin is driven
low, data is shifted in, and CS is driven high to latch the
data. Typically, only one slave is addressed at a time.
DOUT is not used.
__________Applications Information
Multiplexers
The MAX395 can be used as a multiplexer, but to
obtain the same electrical performance with slightly
improved programming speed, use the MAX349 8-
channel mux or the MAX350 dual 4-channel mux, both
in 18-pin packages.
D7 D6 D5 D4 D3 D2 D1 D0
DATA BITS FROM PREVIOUS DATA INPUT
D7 D6 D5 D4 D3 D2 D1 D0
DOUT
DIN
SCLK
SWITCHES
UPDATED

CS
D0
DATA BITS
Figure 2. Three-Wire Interface Timing
RESET
X0
01
X1
11
Switch 7 open (off)
Switch 6 open (off)
Switch 7 closed (on)
All switches open, D7–D0 = 0
FUNCTION
X1
X1
X1
X1
Switch 5 open (off)
Switch 4 open (off)
Switch 5 closed (on)
Switch 6 closed (on)
X1
X1
X1
X1
Switch 3 open (off)
Switch 2 open (off)
Switch 3 closed (on)
Switch 4 closed (on)
X1
X1
X1
X1
Switch 1 open (off)
Switch 0 open (off)
Switch 1 closed (on)
Switch 2 closed (on)
D7
X
0
X
X
X
X
X
1
X
X
X
X
X
X
X
X
D6
X X
XX
X
X
X
X
0
X
X
X
X
X
1
X
X
X
X
D4
X
0
X
1
X
X
X
X
X
X
X
X
X
D5
X X
XX
X
X
X
X
X
X
X
X
0
X
X
X
X
X
1
D2
X X
XX
X
X
X
DATA BITS
X
X
X
X
X
X
X
X
X
X
X
0
X
X
X
D0
X
X
X
X
X
X
X
X
X
X
0
X
1
X
D1
X
0
X
1
X
X
X
X
X
D3
X XX XX1 1X Switch 0 closed (on)X
Table 1. Serial-Interface Switch Programming