General Description
The MAX349/MAX350 are 8-channel and dual 4-channel
serially controlled multiplexers (muxes). These muxes
conduct equally well in either direction. On-resistance
(100
max) is matched between switches to 16
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 sin-
gle supply between +2.7V and +16V. Each mux can
handle rail-to-rail analog signals. The off-leakage current
is only 0.1nA at +25C or 5nA at +85C.
Upon power-up, all switches are off and the internal
shift registers are reset to zero.
The serial interface is compatible with SPITM/QSPITM
and MICROWIRETM. 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 MAX349s or MAX350s
to be daisy chained.
All digital inputs have 0.8V or 2.4V logic thresholds,
ensuring both TTL and CMOS-logic compatibility when
using 5V supplies or a single +5V supply.
________________________Applications
Serial Data-Acquisition
Industrial and Process-
Systems
Control Systems
Avionics
ATE Equipment
Audio Signal Routing
Networking
____________________________Features
o
SPI/QSPI, MICROWIRE-Compatible Serial
Interface
o
8 Separately Controlled SPST Switches
o
Single 8-to-1 Mux (MAX349)
Dual 4-to-1 Mux (MAX350)
o
100
Signal Paths with 5V Supplies
o
Rail-to-Rail
Signal Handling
o
Asynchronous
RESET
Input
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)
MAX349/MAX350
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
________________________________________________________________
Maxim Integrated Products
1
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
CS
RESET
DOUT
V-
GND
DIN
V+
SCLK
TOP VIEW
N.C.
NO7
NO6
NO5
NO2
NO1
NO0
COM
10
9
NO4
NO3
DIP/SO
MAX349
LOGIC
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
CS
RESET
DOUT
V-
GND
DIN
V+
SCLK
COMB
NO0B
NO1B
NO2B
NO2A
NO1A
NO0A
COMA
10
9
NO3B
NO3A
DIP/SO
MAX350
LOGIC
N.C. = NOT INTERNALLY
CONNECTED
Pin Configurations/Functional Diagrams
19-0451; Rev 1; 10/98
PART
MAX349
CPN
MAX349CWN
MAX349CAP
0C to +70C
0C to +70C
0C to +70C
TEMP. RANGE
PIN-PACKAGE
18 Plastic DIP
18 Wide SO
20 SSOP
Ordering Information
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
MAX349C/D
0C to +70C
Dice*
Pin Configurations continued at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX349/MAX350
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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
= +25C.)
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.
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
= +70C)
18-Pin Plastic DIP (derate 11.11mW/C above +70C) ..889mW
18-Pin SO (derate 9.52mW/C above +70C)...............762mW
20-Pin SSOP (derate 8.00mW/C above +70C) ..........640mW
18-Pin CERDIP (derate 10.53mW/C above +70C).....842mW
Operating Temperature Ranges
MAX349C_ _, MAX350C_ _ .................................0C to +70C
MAX349E_ _, MAX350E_ _ ...............................-40C to +85C
MAX349M_ _, MAX350M_ _ ...........................-55C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
CONDITIONS
UNITS
MIN
TYP
MAX
(Note 1)
SYMBOL
PARAMETER
60
100
V
V-
V+
V
COM
, V
NO
Analog Signal Range
V+ = 5V, V- = -5V,
V
COM
= 3V, I
NO
= 1mA
125
R
ON
COM-NO On-Resistance
C, E, M
T
A
= +25C
C, E, M
T
A
= +25C
16
C, E, M
V+ = 5V, V- = -5V,
V
COM
= 3V, I
NO
= 1mA
20
R
ON
COM-NO On-Resistance Match
Between Channels (Note 2)
T
A
= +25C
10
C, E, M
V+ = 5V, V- = -5V, I
NO
= 1mA,
V
COM
= -3V, 0V, 3V
15
R
FLAT(ON)
COM-NO On-Resistance
Flatness (Note 2)
T
A
= +25C
-0.1
0.002
0.1
ANALOG SWITCH
C, E
-5
5
V+ = 5.5V, V- = -5.5V,
V
COM
= -4.5V, V
NO
= 4.5V
M
-10
10
T
A
= +25C
-0.1
0.002
0.1
C, E
-5
5
NO Off-Leakage Current
(Note 3)
I
NO(OFF)
V+ = 5.5V, V- = -5.5V,
V
COM
= 4.5V, V
NO
= -4.5V
M
-10
10
nA
T
A
= +25C
-0.1
0.002
0.1
C, E
-10
10
M
-100
100
T
A
= +25C
-0.1
0.002
0.1
C, E
-5
5
V+ = 5.5V,
V- = -5.5V,
V
COM
=
4.5V,
V
NO
= 4.5V
M
-50
50
T
A
= +25C
-0.2
0.002
0.2
C, E
-10
10
M
-100
100
T
A
= +25C
-0.2
0.002
0.2
C, E
-5
5
COM Off-Leakage Current
(Note 3)
I
COM(OFF)
V+ = 5.5V,
V- = -5.5V,
V
COM
=
-4.5V,
V
NO
= 4.5V
M
-50
50
nA
MAX349
MAX349
MAX350
MAX350
MAX349/MAX350
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
_______________________________________________________________________________________
3
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
= +25C.)
V
2.4
C, E, M
V
IH
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold High
MAX350
nA
-50
50
M
V+ = 5.5V,
V- = -5.5V,
V
COM
= V
NO
=
4.5V
COM On-Leakage Current
(Note 3)
I
COM(ON)
-5
5
C, E
MAX349
-0.2
0.02
0.2
T
A
= +25C
-100
100
M
-10
10
C, E
DOUT Output Voltage Logic Low
V
DOUT
V
I
DOUT
= -1.6mA
0
0.4
C, E, M
mV
100
C, E, M
DOUT Output Voltage Logic High
V
DOUT
SCLK
HYST
V
I
DOUT
= 0.8mA
SCLK Input Hysteresis
2.8
V+
C, E, M
A
-1
0.03
1
C, E, M
V
DIN
, V
SCLK
,
V
CS
= 0.8V or 2.4V
I
IH,
I
IL
DIN, SCLK, CS, RESET Input
Current Logic High or Low
V
0.8
C, E, M
V
IL
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold Low
-0.2
0.001
0.2
T
A
= +25C
Turn-On Time
t
ON
400
ns
From rising edge of CS
C, E, M
200
275
T
A
= +25C
-2
2
30
C, E, M
C, E, M
R
L
= 50
, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
Off-Isolation
V
ISO
dB
pC
pF
pF
Charge Injection (Note 4)
NO Off-Capacitance
COM Off-Capacitance
V
CTE
C
NO(OFF)
C
COM(OFF)
V
COM
= GND, f = 1MHz
C
L
= 1nF, V
NO
= 0V, R
S
= 0
Break-Before-Make Delay
t
BBM
2
ns
V
NO
= GND, f = 1MHz
T
A
= +25C
2
T
A
= +25C
1
10
From rising edge of CS
T
A
= +25C
5
40
T
A
= +25C
PARAMETER
SYMBOL
MIN
TYP
MAX
(Note 1)
UNITS
V+ Supply Current
I+
7
20
A
V- Supply Current
I-
-1
0.1
1
A
Turn-Off Time
t
OFF
300
ns
From rising edge of CS
C, E, M
90
150
T
A
= +25C
DIN = CS = SCLK = 0V or V+,
RESET = 0V or V+
DIN = CS = SCLK = 0V or V+,
RESET = 0V or V+
Channel-to-Channel Crosstalk
V
CT
dB
< -90
R
L
= 50
, C
L
= 15pF,
V
NO
= 1V
RMS
, f = 100kHz
T
A
= +25C
Switch On-Capacitance
C
(ON)
> 90
C, E, M
T
A
= +25C
pF
Power-Supply Range
V+, V-
3
8
V
T
A
= +25C
8
CONDITIONS
V
COM
= V
NO
= GND,
f = 1MHz
T
A
= +25C
T
A
= +25C
DIGITAL I/O
SWITCH DYNAMIC CHARACTERISTICS
POWER SUPPLY
MAX349/MAX350
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
4
_______________________________________________________________________________________
SCLK Frequency
f
SCLK
RESET Minimum Pulse Width
t
RW
70
ns
T
A
= +25C
Fall Time of DOUT (Note 4)
t
DF
100
ns
20% of V+ to 70% of V+,
C
L
= 10pF
C, E, M
Allowable Fall Time at DIN, SCLK
(Note 4)
t
SCF
2
s
20% of V+ to 70% of V+,
C
L
= 10pF
C, E, M
Allowable Rise Time at DIN, SCLK
(Note 4)
t
SCR
2
s
20% of V+ to 70% of V+,
C
L
= 10pF
C, E, M
Rise Time of DOUT (Note 4)
t
DR
100
ns
20% of V+ to 70% of V+,
C
L
= 10pF
C, E, M
DIN Data Valid after Falling SCLK
(Note 4)
t
DO
400
ns
Data Hold Time
Minimum Data Setup Time
t
DS
17
100
ns
t
DH
0
-17
85
50% of SCLK to 10% of DOUT,
C
L
= 10pF
SCLK Low Time
ns
t
CL
C, E, M
190
ns
T
A
= +25C
C, E, M
C, E, M
PARAMETER
SYMBOL
MIN
TYP
MAX
(Note 1)
UNITS
C, E, M
SCLK High Time
CS Lag Time
t
CSH2
240
ns
t
CH
190
CS Lead Time
Cycle Time
ns
t
CH
+ t
CL
480
t
CSS
240
ns
C, E, M
0
2.1
ns
MHz
C, E, M
C, E, M
C, E, M
C, E, M
CONDITIONS
SERIAL DIGITAL INTERFACE
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
= +25C.)
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.
MAX349/MAX350
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
_______________________________________________________________________________________
5
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
= +25C.)
T
A
= +25C
C, E, M
125
175
C, E, M
V
V-
V+
V
COM
, V
NO
Analog Signal Range
T
A
= +25C
-0.1
0.002
0.1
T
A
= +25C
-0.2
0.002
0.2
C, E
C, E
CONDITIONS
-10
10
-10
10
V+ = 5V, V
COM
= 3.5V,
I
NO
= 1mA
M
-100
100
T
A
= +25C
M
-100
100
T
A
= +25C
-0.2
0.002
0.2
MAX349
C, E
-5
5
M
225
R
ON
COM-NO On-Resistance
-50
50
-0.1
0.002
0.1
nA
V+ = 5.5V,
V
COM
= 0V,
V
NO
= 4.5V
MAX350
I
COM(OFF)
COM Off-Leakage Current
(Notes 4, 5)
T
A
= +25C
-0.2
0.01
0.2
C, E
-10
10
M
-100
100
T
A
= +25C
-0.2
0.02
0.2
MAX349
C, E
-5
5
M
MAX349
-50
50
C, E
-5
5
M
-50
50
V+ = 5.5V,
V
COM
= V
NO
=
4.5V
nA
MAX350
V+ = 5.5V,
V
COM
= 4.5V,
V
NO
= 0V
I
COM(ON)
COM On-Leakage Current
(Notes 4, 5)
MAX350
UNITS
MIN
TYP
MAX
(Note 1)
SYMBOL
PARAMETER
T
A
= +25C
-0.1
0.002
0.1
C, E
-5
5
M
V+ = 5.5V, V
COM
= 4.5V,
V
NO
= 0V
-10
10
C, E, M
2.4
C, E, M
0.8
V
IL
V
IH
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold Low
DIN, SCLK, CS, RESET Input
Voltage Logic Threshold High
V
V
C, E, M
-1
0.03
1
C, E, M
2.8
V+
C, E, M
0
0.4
I
DOUT
= -1.6mA
I
DOUT
= 0.8mA
V
DIN
, V
SCLK
,
V
CS
= 0.8V or 2.4V
V
DOUT
V
DOUT
I
IH
, I
IL
DOUT Output Voltage Logic Low
DOUT Output Voltage Logic High
DIN, SCLK, CS, RESET Input
Current Logic High or Low
V
V
A
C, E, M
100
SCLK
HYST
SCLK Input Hysteresis
mV
T
A
= +25C
7
20
C, E, M
30
DIN = CS = SCLK = 0V or V+,
RESET = 0V or V+
I+
V+ Supply Current
A
T
A
= +25C
-0.1
0.002
0.1
C, E
-5
5
M
V+ = 5.5V, V
COM
= 0V,
V
NO
= 4.5V
nA
-10
10
I
NO(OFF)
NO Off-Leakage Current
(Notes 4, 5)
DIGITAL I/O
ANALOG SWITCH
POWER SUPPLY
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