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Serial Controlled, 8-Channel SPST Switch
_______________General Description
The MAX335 analog switch with serial digital interface
offers eight separately controlled single-pole-single-
throw (SPST) switches. All switches conduct equally in
either direction, and on-resistance (100W) is constant
over the analog signal range.
These CMOS switches can operate continuously with
power supplies ranging from
±4.5V
to
±20V
and handle
rail-to-rail analog signals. Upon power-up, all switches are
off, and the internal serial and parallel shift registers are
reset to zero. The MAX335 is equivalent to two DG211
quad switches but controlled by a serial interface.
The interface is compatible with the Motorola SPI inter-
face standard. Functioning as a shift register, this serial
interface allows data (at DIN) to be locked in synchro-
nous with the rising edge of clock (SCLK). The shift reg-
ister's output (DOUT) enables several MAX335s to be
daisy chained.
____________________________Features
o
8 Separately Controlled SPST Switches
o
SPI-Compatible Serial Interface
o
Accepts
±15V
Analog Swings
o
Multiple Devices Can Be Daisy Chained
MAX335
______________Ordering Information
PART
MAX335CNG
MAX335CWG
MAX335C/D
MAX335ENG
MAX335EUG
MAX335EWG
MAX335MRG
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
24 Narrow Plastic DIP
24 Wide SO
Dice*
24 Narrow Plastic DIP
24 TSSOP
24 Wide SO
24 Narrow CERDIP**
________________________Applications
Serial Data Acquisition and Process Control
Avionics
Signal Routing
Networking
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883.
__________________Pin Configuration
TOP VIEW
NO0
NO7
SCLK
V+
DIN
1
2
3
4
5
6
7
8
9
24 CS
23 VL
22 DOUT
COM0
COM7
GND
NO0
MAX335
21 V-
20 NO7
19 COM7
18 NO6
17 COM6
16 NO5
15 COM5
14 NO4
13 COM4
PARALLEL REGISTER AND TRANSLATOR
COM0
DOUT
NO1
COM1
NO2
D
IN
8-BIT SHIFT REGISTER
V
L
+5V TRANSLATOR
COM2 10
MAX335
SCLK
CLOCK TRANSLATOR
LATCH
CS
CS TRANSLATOR
NO3 11
COM3 12
DIP/SO
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Serial Controlled, 8-Channel SPST Switch
MAX335
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to V-
V+...........................................................................................44V
GND .......................................................................................25V
V
L
.....................................................(GND - 0.3V) to (V+ + 0.3V)
SCLK,
CS,
DIN, DOUT, NO_, COM_ ...............V- -2V to V+ +2V
or 30mA, whichever occurs first
Continuous Current (any terminal) .......................................30mA
Peak Current, NO or COM
(pulsed at 1ms, 10% duty cycle MAX) ...............................00mA
Note 1:
All leads are soldered or welded to PC boards.
Continuous Power Dissipation (T
A
= +70°C) (Note 1)
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
TSSOP (derate 12.2mW/°C above +70°C)...........................30mA
Operating Temperature Ranges
MAX335C_ _ ............................................................0°C to +70°C
MAX335E_ _ .........................................................-40°C to +85°C
MAX335MRG.......................................................-55°C to +125°C
Storage Temperature Range ..............................-65°C to +160°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
(V
L
= +5V ±10%, V+ = 15V, V- = -15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SWITCH
Analog Signal Range
On-Resistance
V
ANALOG
R
ON
T
A
= T
MIN
to T
MAX
V
COM
= ±10V,
INO = 1mA
V
COM
= -14V,
V
NO
= +14V
V
COM
= -14V,
V
NO
= +14V
V
COM
= -14V,
V
NO
= +14V
V
COM
= -14V,
V
NO
= +14V
V
COM
= V
NO
= +14V
COM On-Leakage Current
I
COM(ON)
V
COM
= V
NO
= -14V
DIGITAL I/O
DIN, SCLK,
CS
Input Logic
Threshold High
–
DIN, SCLK,
CS
Input Logic
Threshold Low
DIN, SCLK,
CS
Input Current
Logic High
–
DIN, SCLK,
CS
Input Current
Logic Low
DOUT Output Voltage
Logic High
V
IH
V
IL
I
INH
I
INL
V
DOUT
V
L
= +5V
V
L
= +15V
V
L
= +5V
V
L
= +15V
V
DIN
, V
SCLK
, V
CS
= 2.4V
—
–
V
L
= +15V, V
DIN
, V
SCLK
, V
– S
= 11V
C
SYMBOL
CONDITIONS
MIN
-15
TYP
MAX
15
UNITS
V
Ω
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
-1
-20
-1
-20
-1
-20
-1
-20
-2
-40
-2
-40
2.4
11
100
0.002
0.002
0.002
0.002
0.01
0.01
150
200
1
20
1
20
1
20
1
20
2
40
2
40
NO Off-Leakage Current
I
NO(OFF)
nA
COM Off-Leakage Current
I
COM(OFF)
nA
nA
V
0.8
3
V
µA
µA
V
-1
-1
-1
-1
3.5
0.03
0.03
0.03
0.03
1
1
1
1
V
L
V
DIN
, V
SCLK
, V
CS
= 0.8V
––
—
V
L
= +15V, V
DIN
, V
SCLK
, V
CS
= 3V
I
DOUT
= 0.8mA
2
_______________________________________________________________________________________
Serial Controlled, 8-Channel SPST Switch
ELECTRICAL CHARACTERISTICS (continued)
(V
L
= +5V ±10%, V+ = 15V, V- = -15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
DIGITAL I/O
DOUT Output Voltage
Logic Low
V
L
RESET Voltage
V
L
RESET Voltage
SCLK Input Hysteresis
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX335
V
DOUT
V
LL
V
LH
SCLK
HYST
I
DOUT
= -1.6mA
(Note 2)
T
A
= +25°C
T
A
= +25°C
From rising edge of
CS
From rising edge of
CS
V
S
= GND, f = 1MHz
V
D
= V
S
= GND,
f = 1MHz
R
L
= 100Ω, C
L
= 15pF,
V
S
= 1V
RMS
, f = 100kHz
R
L
= 50Ω, C
L
= 15pF,
V
S
= 1V
RMS
, f = 100kHz
D
LOAD
= S
LOAD
=
75Ω, measured
at S and D
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
25
T
A
= +25°C
100
200
90
2
2
8
90
100
15
0.8
0.4
V
V
2.4
V
mV
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time
Turn-Off Time
NO Off-Capacitance
COM Off-Capacitance
Channel On-Capacitance
Off Isolation
Channel-to-Channel Crosstalk
Break-Before-Make Delay
Clock Feedthrough at S, D
(Note 3)
POWER SUPPLIES
Power-Supply Voltage Range
V
L
Power-Supply Voltage Range
V+ Supply Current
V- Supply Current
V
L
Supply Current
V+/V-
V
L
I+
I-
I
L
DIN =
CS
= SCLK =
0V/5V
DIN =
CS
= SCLK =
0V/5V
DIN =
CS
= SCLK =
0V/5V
T
A
= +25°C
T
A
= +25°C
T
A
= +25°C
±4.5
4.5
150
0.01
50
±20
V+
300
500
10
10
100
200
V
V
µA
µA
µA
t
ON
t
OFF
C
NO(OFF)
400
500
400
500
ns
ns
pF
pF
pF
dB
dB
ns
100
nV-sec
C
COM(OFF)
V
D
= GND, f = 1MHz
C
COM(ON)
OIRR
CCRR
T
BBM
ESCLK
Note 2:
When V
L
falls below this voltage, all switches are set off and the internal shift register is cleared (all zero).
Note 3:
Guaranteed, not production tested.
_______________________________________________________________________________________
3
Serial Controlled, 8-Channel SPST Switch
MAX335
TIMING CHARACTERISTICS OF SERIAL DIGITAL INTERFACE
(Figure 1)
(V
L
= +5V ±10%, V+ = +15V, V- = -15V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
PARAMETER
SCLK Maximum Frequency
Cycle Time
CS
Lead Time
CS
Lag Time
SCLK High Time
SCLK Low Time
Data-Setup Time
Data-Hold Time
DOUT Data Valid After
Falling SCLK
DOUT Data-Hold Time After Rising
SCLK (Note 4)
Rise Time of DOUT (Note 3)
Allowable Rise Time at DIN,
SCLK,
CS
(Note 3)
Fall Time of DOUT (Note 3)
Allowable Fall Time at DIN,
SCLK,
CS
(Note 3)
SYMBOL
f
SCLK
t
CH +
t
CL
t
CSS
t
CSH2
t
CH
t
CL
t
DS
t
DH
t
DO
50% of SCLK to 10% of
DOUT CL = 10pF
C
L
= 10pF
20% V
L
to 70% V
L
, C
L
= 10pF
20% V
L
to 70% V
L
, C
L
= 10pF
70% V
L
to 20% V
L
, C
L
= 10pF
70% V
L
to 20% V
L
, C
L
= 10pF
T
A
= +25°C
CONDITIONS
MIN
2.1
480
240
240
190
190
200
0
240
ns
400
0
100
2
100
2
ns
ns
µs
ns
µs
TYP
MAX
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
Note 4:
This specification guarantees that data at D
OUT
never appears before SCLK's falling edge.
4
_______________________________________________________________________________________
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