1
PS8462B
01/12/01
Features
Low On-Resistance (100 ohm typ.)
Minimizes Distortion and Error Voltages
Dual Supply Operation (±2.7V to ±8V)
Second Source for MAX395
SPI/QSI, Microwire-Compatible Serial Interface
Single-Supply Operation (+2.7V to +16V)
On-Resistance Flatness: 10 ohm Max.
On-Resistance Matching Between Channels: 5 ohm Max.
TTL/CMOS Logic Compatible (w/+5V or ±5V supplies)
Fast Switching Speed
Break-Before-Make action eliminates momentary crosstalk
Rail-to-RailAnalog Signal Range
Low Power Consumption
Narrow SOIC and QSOP Packages Minimize BoardArea
Asynchonous Reset (RS) Input
Applications
Data Acquisition Systems
Audio Switching and Routing
Test Equipment
PBX, PABX
Telecommunication Systems
Battery-Powered Systems
Description
The PS395 eight-channel, serially controlled, single-pole/single-
throw (SPST) analog switch offers eight separately controlled
switches that conduct equally well in either direction. ON-resis-
tance (100 ohm max.) is matched between switches to 5 ohm max.
and is flat (10 ohm max.) over the specified signal range.
These CMOS devices can operate continuously with dual power
supplies ranging from ±2.7V to ±8V or a single supply between
+2.7V and +16V. Each switch can handle rail-to-rail analog signals.
The off leakage current is only 0.1nA at +25°C or 5nA at +85°C.
Upon power-up, all switches are off, and the internal shift registers
are reset to zero. The PS395 is electrically equivalent to two PS391
quad switches controlled by a serial interface, and is pin compat-
ible with the PS335.
The serial interface is compatible with SPI/QSPI and
Microwire. Functioning as a shift register, it allows data (at DIN)
to be clocked-in synchronously with the rising edge of clock
(SCLK). The shift registers output (DOUT) enables several PS395s
to be daisy chained.
All digital inputs have 0.8V to 2.4V logic thresholds, ensuring both
TTL- and CMOS-logic compatibility when using ±5V supplies or a
single +5V supply.
Pin Configurations
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Pin Description
Note:
NO and COM pins are identical and interchangeble. Either may
be considered as an input or an output; signals pass equally
well in either direction.
PS395
Precision 8-Channel 17V,
SPST Switch w/ Serial Control
12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012
16
15
14
13
8
1
2
3
4
5
6
7
9
10
11
12
17
24
23
22
21
20
19
18
CLK
V+
DATAIN
GND
NO0
COM0
NO1
COM1
NO2
COM2
NO3
COM3
DIP/SO
EN
RS
DATAOUT
V–
NO7
COM7
NO6
COM6
NO5
COM5
NO4
COM4
8-Bit
Decoding
Logic
SPI & QSPI are trademarks of Motorola, Inc. Microwire is a trademark
of National Semiconductor Corporation
Top View
PS395