
1
PS8462
02/22/00
Features
 Low On-Resistance (100 typ.)
Minimizes Distortion and Error Voltages
 Single Supply Operation (±2.7V to ±8V)
 Improved Second Source for MAX395
 SPI/QSI, Microwire-Compatible Serial Interface
 Split-Supply Operation (+3V to +8V)
 On-Resistance Flatness: 10 Max.
 On-Resistance Matching Between Channels: 5 Max.
 TTL/CMOS Logic Compatible (w/+5V or ±5V supplies)
 Fast Switching Speed
 Break-Before-Make action eliminates momentary crosstalk
 Rail-to-Rail Analog Signal Range
 Low Power Consumption
 Narrow SOIC and QSOP Packages Minimize Board Area
 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 max.) is matched between switches to 5 max. and is
flat (10 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
e
m
a
Nn
o
it
c
n
u
F
K
L
Ct
u
p
n
I
l
a
ti
g
i
D
k
c
o
l
C
l
ai
r
e
S
+
Vt
u
p
n
I
e
g
a
tl
o
V
y
l
p
u
S
g
o
l
a
n
A
e
v
it
i
s
o
P
A
T
A
D
N
I
t
u
p
n
I
l
a
ti
g
i
D
a
t
a
D
l
ai
r
e
S
D
N
Gd
n
u
o
r
G
O
N 0 O
N
7
0
s
e
h
c
ti
w
S
g
o
l
a
n
A
n
e
p
O
y
ll
a
m
r
o
N
M
O
C
0
M
O
C
7
0
s
e
h
c
ti
w
S
g
o
l
a
n
A
n
o
m
o
C
Vt
u
p
n
I
e
g
a
tl
o
V
y
l
p
u
S
g
o
l
a
n
A
e
v
it
a
g
e
N
A
T
A
D
T
U
O
t
u
p
t
u
O
l
a
ti
g
i
D
a
t
a
D
l
ai
r
e
S
Rt
u
p
n
I
t
e
s
e
R
)
T
E
S
E
R
(
S
Ct
u
p
n
I
l
a
ti
g
i
D
t
c
el
e
S
-
p
i
h
C
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-Ch. 17V, SPST Switch
w/8-Bit Serial Decoded 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