PS395 데이터 시트보기 (PDF) - Pericom Semiconductor
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PS395 Datasheet PDF : 13 Pages
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PS395
Precision 8-Ch. 17V, SPST Switch
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8x1 Multiplexer
To use the PS395 as an 8x1 multiplexer, connect all common pins
together (COM0COM7) to form the mux output; the mux inputs
are NO0NO7.
The mux can be programmed normally, with only one channel se-
lected for every eight clock pulses, or it can be programmed in a
fast mode, where channel changing occurs on each clock pulse. In
this mode, the channels are selected by sending a single high
pulse (corresponding to the selected channel) at DIN, and a corre-
sponding CS low pulse for every eight clock pulses. As this is
clocked through the register by SCLK, each switch sequences one
channel at a time, starting with Channel 7.
Dual, Differential 4-Channel Multiplexer
To use the PS395 as a dual (4x2) mux, connect COM0COM3
together and connect COM4COM7 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 pulses, or it can be pro-
grammed 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 (corresponding 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 SCLK, each switch sequences one differential channel at a
time, starting with channel 7/0. After the first eight bits have been
sent, subsequent channel sequencing can occur by repeating this
sequence or, even faster, by sending only one DIN high pulse and
one CS low pulse for each four clock pulses.
SPDT Switches
To use the PS395 as a quad, single-pole/double-throw (SPDT)
switch, connect COM0 to NO1, COM2 to NO3, COM4 to NO5, and
COM6 to NO7, forming the four common pins. Program these
four switches with pairs of instructions, as shown in SPST Truth
Table.
Reset Function
RESET is the internal reset pin. It is usually connected to a logic
signal or V+. Drive RESET low to open all switches and set the
contents of the internal shift register to zero simultaneously. When
RESET is high, the part functions normally and DOUT is sourced
from V+. RESET must not be driven beyond V+ or GND.
SCLK
DIN
PS395
DOUT
CS
SK
SO
Microwire
SI Port
I/O
The DOUT-SI connection is not required for writing to
the PS395, but may be used for data-echo purposes.
Figure 2. Connections for Microwire
DOUT
DIN
PS395
SCLK
CS
MISO
MOSI
SPI
SCK Port
I/O
CPOL = 0, CPHA = 0
The DOUT-MISO connection is not required for writing to
the PS395, but may be used for data-echo purposes.
Figure 3. Connections for SPI and QSPI
SCLK
DIN
CS
SCLK
DIN
CS
SCLK
DIN
CS
To
Other
Serial
Devices
Figure 4. Daisy-Chained Connection
11
PS8462 02/22/00
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