19-0451; Rev 1; 10/98
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
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
(100Ω max) is matched between switches to 16Ω 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 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 +25°C or 5nA at +85°C.
Upon power-up, all switches are off and the internal
shift registers are reset to zero.
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 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.
____________________________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
100Ω 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
Ordering Information
PART
MAX349CPN
MAX349CWN
MAX349CAP
MAX349C/D
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
18 Plastic DIP
18 Wide SO
20 SSOP
Dice*
________________________Applications
Serial Data-Acquisition
Systems
Avionics
Audio Signal Routing
Industrial and Process-
Control Systems
ATE Equipment
Networking
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
Pin Configurations/Functional Diagrams
TOP VIEW
SCLK 1
V+ 2
DIN 3
GND 4
COM 5
NO0 6
NO1 7
NO2 8
NO3 9
LOGIC
MAX349
18 CS
17 RESET
16 DOUT
15 V-
14 N.C.
13 NO7
12 NO6
11 NO5
10 NO4
SCLK 1
V+ 2
DIN 3
GND 4
COMA 5
NO0A 6
NO1A 7
NO2A 8
NO3A 9
MAX350
18 CS
17 RESET
LOGIC
16 DOUT
15 V-
14 COMB
13 NO0B
12 NO1B
11 NO2B
10 NO3B
N.C. = NOT INTERNALLY
CONNECTED
DIP/SO
DIP/SO
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.
________________________________________________________________
Maxim Integrated Products
1
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.
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
MAX349/MAX350
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)
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C) ..889mW
18-Pin SO (derate 9.52mW/°C above +70°C)...............762mW
20-Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW
Operating Temperature Ranges
MAX349C_ _, MAX350C_ _ .................................0°C to +70°C
MAX349E_ _, MAX350E_ _ ...............................-40°C to +85°C
MAX349M_ _, MAX350M_ _ ...........................-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)
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
NO Off-Leakage Current
(Note 3)
I
NO(OFF)
V+ = 5.5V, V- = -5.5V,
V
COM
= 4.5V, 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
V+ = 5.5V,
V- = -5.5V,
V
COM
=
±4.5V,
V
NO
= ±4.5V
COM Off-Leakage Current
(Note 3)
I
COM(OFF)
V+ = 5.5V,
V- = -5.5V,
V
COM
=
-4.5V,
V
NO
= 4.5V
MAX349
MAX349
C, E
M
T
A
= +25°C
MAX350
C, E
M
T
A
= +25°C
C, E
M
T
A
= +25°C
MAX350
C, E
M
2
-0.1
-5
-10
-0.1
-5
-10
-0.1
-10
-100
-0.1
-5
-50
-0.2
-10
-100
-0.2
-5
-50
0.002
0.002
0.002
0.002
0.002
0.002
V-
60
V+
100
125
16
20
10
15
0.1
5
10
0.1
5
10
0.1
10
100
0.1
5
50
0.2
10
100
0.2
5
50
nA
nA
V
Ω
Ω
Ω
SYMBOL
CONDITIONS
MIN
TYP
(Note 1)
MAX
UNITS
_______________________________________________________________________________________
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
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
T
A
= +25°C
C, E
M
T
A
= +25°C
C, E
M
MIN
-0.2
-10
-100
-0.2
-5
-50
TYP
(Note 1)
0.001
MAX
0.2
10
100
0.2
5
50
UNITS
MAX349/MAX350
COM On-Leakage Current
(Note 3)
I
COM(ON)
V+ = 5.5V,
V- = -5.5V,
V
COM
= V
NO
=
±4.5V
MAX349
0.02
nA
MAX350
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
V
IH
V
IL
I
IH,
I
IL
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
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
-1
2.8
0
100
200
90
5
40
1
2
2
8
> 90
< -90
275
400
150
300
10
0.03
2.4
0.8
1
V+
0.4
V
V
µA
V
V
mV
DOUT Output Voltage Logic High
V
DOUT
DOUT Output Voltage Logic Low
V
DOUT
SCLK Input Hysteresis
SCLK
HYST
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-
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
ns
ns
ns
pC
pF
pF
pF
dB
dB
DIN =
CS
= SCLK = 0V or V+,
RESET
= 0V or V+
DIN =
CS
= SCLK = 0V or V+,
RESET
= 0V or V+
±8
20
30
1
2
V
µA
µA
_______________________________________________________________________________________
3
Serially Controlled, Low-Voltage,
8-Channel/Dual 4-Channel Multiplexers
MAX349/MAX350
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
Minimum 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
0
17
-17
85
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
µs
ns
100
400
100
2
100
2
70
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/Dual 4-Channel Multiplexers
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
NO Off-Leakage Current
(Notes 4, 5)
I
NO(OFF)
V+ = 5.5V, V
COM
= 0V,
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
MAX349
V+ = 5.5V,
V
COM
= 4.5V,
V
NO
= 0V
MAX350
COM Off-Leakage Current
(Notes 4, 5)
I
COM(OFF)
MAX349
V+ = 5.5V,
V
COM
= 0V,
V
NO
= 4.5V
MAX350
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
MAX349
COM On-Leakage Current
(Notes 4, 5)
I
COM(ON)
V+ = 5.5V,
V
COM
= V
NO
=
±4.5V
MAX350
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
POWER SUPPLY
V+ Supply Current
I+
DIN =
CS
= SCLK = 0V or V+, T
A
= +25°C
RESET
= 0V or V+
C, E, M
7
20
30
µA
5
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
-1
2.8
0
100
0.03
2.4
0.8
1
V+
0.4
V
V
µA
V
V
mV
C, E
M
T
A
= +25°C
C, E
M
-0.1
-5
-10
-0.1
-5
-10
-0.1
-10
-100
-0.1
-5
-50
-0.2
-10
-100
-0.2
-5
-50
-0.2
-10
-100
-0.2
-5
-50
0.02
0.01
0.002
0.002
0.002
0.002
0.002
0.002
V-
125
V+
175
225
0.1
5
10
0.1
5
10
0.1
10
100
0.1
5
50
0.2
10
100
0.2
5
50
0.2
10
100
0.2
5
50
nA
nA
nA
V
Ω
SYMBOL
CONDITIONS
MIN
TYP
(Note 1)
MAX
UNITS
MAX349/MAX350
_______________________________________________________________________________________
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