19-0448; Rev 0; 11/95
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
_______________General Description
The MAX395 8-channel, serially controlled, single-pole/sin-
gle-throw (SPST) analog switch offers eight separately
controlled switches. The switches conduct equally well in
either direction. On-resistance (100Ω max) is matched
between switches to 5Ω max and is flat (10Ω 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 MAX395 is electrically
equivalent to two MAX391 quad switches controlled by a
serial interface, and is pin compatible with the MAX335.
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 register’s output (DOUT)
enables several MAX395s to be daisy chained.
All digital inputs have 0.8V to 2.4V logic thresholds, ensur-
ing both TTL- and CMOS-logic compatibility when using
±5V supplies or a single +5V supply.
____________________________Features
o
SPI™/QSPI™, Microwire™-Compatible Serial
Interface
o
8 Separately Controlled SPST Switches
o
100Ω Signal Paths with ±5V Supplies
o
Rail-to-Rail Signal Handling
o
Asynchronous RESET Input
o
Pin Compatible with Industry-Standard MAX335
o
±2.7V to ±8V Dual Supplies
+2.7V to +16V Single Supply
o
>2kV ESD Protection per Method 3015.7
o
TTL/CMOS-Compatible Inputs (with +5V or
±5V Supplies)
MAX395
______________Ordering Information
PART
MAX395CNG
MAX395CWG
MAX395C/D
MAX395ENG
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
24 Narrow Plastic DIP
24 Wide SO
Dice*
24 Narrow Plastic DIP
________________________Applications
Serial Data-Acquisition
Systems
Avionics
Audio Signal Routing
Industrial and Process-
Control Systems
ATE Equipment
Networking
MAX395EWG
-40°C to +85°C
24 Wide SO
MAX395MRG
-55°C to +125°C
24 Narrow CERDIP**
* Contact factory for dice specifications.
** Contact factory for availability.
__________________Pin Configuration
TOP VIEW
SCLK
V+
DIN
GND
NO0
COM0
NO1
COM1
NO2
1
2
3
4
5
6
7
8
9
LOGIC
________________Functional Diagram
NO0
NO7
MAX395
24 CS
23 RESET
22 DOUT
21 V-
20 NO7
19 COM7
18 NO6
17 COM6
16 NO5
15 COM5
14 NO4
13 COM4
COM0
COM7
PARALLEL REGISTER AND TRANSLATOR
DIN
8-BIT SHIFT REGISTER
DOUT
RESET
COM2 10
NO3 11
COM3 12
MAX395
SCLK
CLOCK TRANSLATOR
LATCH
CS
CS TRANSLATOR
DIP/SO
SPI and QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corp.
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
MAX395
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
V+ ...........................................................................-0.3V, +17V
V- ............................................................................-17V, +0.3V
V+ to V-...................................................................-0.3V, +17V
SCLK, CS, DIN, DOUT, RESET .................-0.3V to (V+ + 0.3V)
NO, COM .................................................(V- - 2V) to (V+ + 2V)
Continuous Current into Any Terminal..............................±30mA
Peak Current, NO_ or COM_
(pulsed at 1ms,10% duty cycle)..................................±100mA
Continuous Power Dissipation (T
A
= +70°C)
Narrow Plastic DIP (derate 13.33mW/°C above +70°C)...1067mW
Wide SO (derate 11.76mW/°C above +70°C)...............941mW
Narrow CERDIP (derate 12.50mW/°C above +70°C)....1000mW
Operating Temperature Ranges
MAX395C_ G .......................................................0°C to +70°C
MAX395E_ G ....................................................-40°C to +85°C
MAX395MRG ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ANALOG SWITCH
Analog Signal Range
COM, NO On-Resistance
COM, NO On-Resistance Match
Between Channels (Note 2)
COM, NO On-Resistance
Flatness (Note 2)
NO Off Leakage Current
(Note 3)
V
COM
, V
NO
R
ON
∆R
ON
R
FLAT(ON)
V+ = 5V, V- = -5V,
V
COM
= ±3V, I
NO
= 1mA
V+ = 5V, V- = -5V,
V
COM
= ±3V, I
NO
= 1mA
V+ = 5V, V- = -5V, I
NO
= 1mA,
V
COM
= -3V, 0V, 3V
V+ = 5.5V, V- = -5.5V,
V
COM
= -4.5V, V
NO
= 4.5V
V+ = 5.5V, V- = -5.5V,
V
COM
= 4.5V, V
NO
= -4.5V
V+ = 5.5V, V- = -5.5V,
V
COM
= -4.5V, V
NO
= 4.5V
V+ = 5.5V, V- = -5.5V,
V
COM
= 4.5V, V
NO
= -4.5V
V+ = 5.5V, V- = -5.5V,
V
COM
= V
NO
= ±4.5V
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
-0.1
-10
-0.1
-10
-0.1
-10
0.1
-10
-0.2
-20
0.01
0.002
0.002
0.002
0.002
V-
60
V+
100
125
5
10
10
15
0.1
10
0.1
10
0.1
10
0.1
10
0.2
20
nA
nA
nA
V
Ω
Ω
Ω
SYMBOL
CONDITIONS
MIN
TYP
(Note 1)
MAX
UNITS
I
NO(OFF)
COM Off Leakage Current
(Note 3)
COM On Leakage Current
(Note 3)
DIGITAL I/O
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold High
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold Low
DIN, SCLK, CS, RESET Input
Current Logic High or Low
DOUT Output Voltage Logic High
DOUT Output Voltage Logic Low
SCLK Input Hysteresis
I
COM(OFF)
I
COM(ON)
V
IH
V
IL
I
IH,
I
IL
V
DOUT
V
DOUT
SCLK
HYST
V
DIN
, V
SCLK
,
V
CS
= 0.8V or 2.4V
I
DOUT
= 0.8mA
I
DOUT
= -1.6mA
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
2.4
0.8
-1
2.8
0
100
0.03
1
V+
0.4
V
V
µA
V
V
mV
2
_______________________________________________________________________________________
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
(Note 1)
200
90
5
15
2
2
2
8
-90
<-90
MAX
UNITS
MAX395
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time
Turn-Off Time
Break-Before-Make Delay
Charge Injection (Note 4)
NO Off Capacitance
COM Off Capacitance
Switch On Capacitance
Off Isolation
Channel-to-Channel Crosstalk
POWER SUPPLY
Power-Supply Range
V+ Supply Current
V- Supply Current
t
ON
t
OFF
t
BBM
V
CTE
C
NO(OFF)
C
COM(OFF)
C
(ON)
V
ISO
V
CT
V+, V-
I+
I-
DIN = CS = SCLK = 0V or V+,
RESET = 0V or V+
DIN = CS = SCLK = 0V or V+,
RESET = 0V or V+
From rising edge of CS
From rising edge of CS
From rising edge of CS
C
L
= 1nF, V
NO
= 0V, R
S
= 0Ω
V
NO
= GND, f = 1MHz
V
COM
= GND, f = 1MHz
V
COM
= V
NO
= GND,
f = 1MHz
R
L
= 50Ω, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
R
L
= 50Ω, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
±3
7
-1
-2
0.1
400
500
400
500
10
ns
ns
ns
pC
pF
pF
pF
dB
dB
±8
20
30
1
2
V
µA
µA
_______________________________________________________________________________________
3
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
MAX395
TIMING CHARACTERISTICS—Dual Supplies (Figure 1)
(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SERIAL DIGITAL INTERFACE
SCLK Frequency
Cycle Time
CS Lead Time
CS Lag Time
SCLK High Time
SCLK Low Time
Data Setup Time
Data Hold Time
DIN Data Valid after Falling SCLK
(Note 4)
Rise Time of DOUT (Note 4)
Allowable Rise Time at DIN, SCLK
(Note 4)
Fall Time of DOUT (Note 4)
Allowable Fall Time at DIN, SCLK
(Note 4)
RESET Minimum Pulse Width
SYMBOL
CONDITIONS
MIN
TYP
MAX
(Note 1)
2.1
UNITS
f
SCLK
t
CH
+ t
CL
t
CSS
t
CSH2
t
CH
t
CL
t
DS
t
DH
t
DO
t
DR
t
SCR
t
DF
t
SCF
t
RW
50% of SCLK to 10% of DOUT,
C
L
= 10pF
20% of V+ to 70% of V+,
C
L
= 10pF
20% of V+ to 70% of V+,
C
L
= 10pF
20% of V+ to 70% of V+,
C
L
= 10pF
20% of V+ to 70% of V+,
C
L
= 10pF
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
T
A
= +25°C
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
T
A
= +25°C
0
480
240
240
190
190
200
0
MHz
ns
ns
ns
ns
ns
ns
ns
17
-17
85
400
100
2
100
2
70
ns
ns
µs
ns
µs
ns
Note 1:
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Note 2:
∆R
ON
= R
ON(max)
- R
ON(min)
. On-resistance match between channels and on-resistance flatness are guaranteed only with
specified voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as
measured over the specified analog signal range.
Note 3:
Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at room temp.
Note 4:
Guaranteed by design.
Note 5:
Leakage testing at single supply is guaranteed by testing with dual supplies.
Note 6:
See Figure 6. Off isolation = 20log
10
V
COM
/V
NO
, V
COM
= output. NO = input to off switch.
Note 7:
Between any two switches. See Figure 3.
4
_______________________________________________________________________________________
Serially Controlled, Low-Voltage,
8-Channel SPST Switch
ELECTRICAL CHARACTERISTICS—Single +5V Supply
(V+ = +4.5V to +5.5V, V- = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
ANALOG SWITCH
Analog Signal Range
COM, NO On-Resistance
V
COM
, V
NO
R
ON
V+ = 5V, V
COM
= 3.5V,
I
NO
= 1mA
V+ = 5.5V, V
COM
= 4.5V,
V
NO
= 0V
V+ = 5.5V, V
COM
= 0V,
V
NO
= 4.5V
V+ = 5.5V, V
COM
= 4.5V,
V
NO
= 0V
V+ = 5.5V, V
COM
= 0V,
V
NO
= 4.5V
V+ = 5.5V,
V
COM
= V
NO
= 4.5V
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
-0.1
-10
-0.1
-10
-0.1
-10
-0.1
-10
-0.2
-20
0.002
0.002
0.002
0.002
0.002
V-
125
V+
175
225
0.1
10
0.1
10
0.1
10
0.1
10
0.2
20
nA
nA
nA
V
Ω
SYMBOL
CONDITIONS
MIN
TYP
(Note 2)
MAX
UNITS
MAX395
NO Off Leakage Current
(Notes 4, 5)
I
NO(OFF)
COM Off Leakage Current
(Notes 4, 5)
COM On Leakage Current
(Notes 4, 5)
DIGITAL I/O
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold High
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold Low
DIN, SCLK, CS, RESET Input
Current Logic High or Low
DOUT Output Voltage Logic High
DOUT Output Voltage Logic Low
SCLK Input Hysteresis
I
COM(OFF)
I
COM(ON)
V
IH
V
IL
I
IH
, I
IL
V
DOUT
V
DOUT
SCLK
HYST
V
DIN
, V
SCLK
,
V
CS
= 0.8V or 2.4V
I
DOUT
= -0.8mA
I
DOUT
= 1.6mA
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
C, E, M
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
2.4
0.8
-1
2.8
0
100
200
90
15
2
-90
<-90
10
400
500
400
500
0.03
1
V+
0.4
V
V
µA
V
V
mV
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time
Turn-Off Time
Break-Before-Make Delay
Charge Injection (Note 4)
Off Isolation (Note 6)
Channel-to-Channel Crosstalk
(Note 7)
POWER SUPPLY
V+, V- Supply Current
I+
DIN = CS = SCLK = 0V or
V+, RESET = 0V or V+
T
A
= +25°C
C, E, M
7
20
30
µA
t
ON
t
OFF
t
BBM
V
CTE
V
ISO
V
CT
From rising edge of CS
From rising edge of CS
From rising edge of CS
C
L
= 1nF, V
NO
= 0V, R
S
= 0Ω
R
L
= 50Ω, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
R
L
= 50Ω, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
ns
ns
ns
pC
dB
dB
_______________________________________________________________________________________
5
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