Maxim MAX4555EPE Force-sense switch Datasheet

19-1358; Rev 0; 4/98
Force-Sense Switches
All digital inputs have +0.8V and +2.4V logic thresholds, ensuring both TTL- and CMOS-logic compatibility.
Applications
Features
♦ 6Ω Force Signal Paths (±15V Supplies)
1Ω Force Signal Matching (±15V Supplies)
♦ 60Ω Sense-Guard Signal Paths (±15V Supplies)
8Ω Sense-Guard Signal Matching (±15V Supplies)
♦ Rail-to-Rail Signal Handling
♦ Break-Before-Make Switching (MAX4556)
♦ tON and tOFF = 275ns (±15V Supplies)
♦ Low 1µA Power Consumption
♦ >2kV ESD Protection per Method 3015.7
♦ TTL/CMOS-Compatible Inputs
Ordering Information
TEMP. RANGE
PART
0°C to +70°C
MAX4554CPE
PIN-PACKAGE
16 Plastic DIP
MAX4554CSE
0°C to +70°C
16 Narrow SO
MAX4554C/D
MAX4554EPE
MAX4554ESE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
Dice*
16 Plastic DIP
16 Narrow SO
Ordering Information continued at end of data sheet.
*Contact factory for availability.
Automated Test Equipment (ATE)
Calibrators
Precision Power Supplies
Automatic Calibration Circuits
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
Asymmetric Digital Subscriber Line (ADSL)
with Loopback
Pin Configurations/Functional Diagrams/Truth Tables
TOP VIEW
MAX4554
NOG1 1
16 COMG
NOS1 2
15 COMS
NOF1* 3
14 COMF*
V- 4
13 V+
EN
1
0
0
0
0
GND 5
12 VL
NOF2* 6
11 IN1
NOS2 7
10 IN2
NOG2 8
9 EN
DIP/SO
IN1
X
0
0
1
1
MAX4554
IN2 COMG
X
OFF
0
OFF
1
NOG2
0
NOG1
NOG1
1
&
NOG2
COMS
OFF
OFF
NOS2
NOS1
NOS1
&
NOS2
COMF*
OFF
OFF
NOF2*
NOF1*
NOF1*
&
NOF2*
NOTE: SWITCH POSITIONS SHOWN WITH IN_ = LOW
*INDICATES HIGH-CURRENT, LOW-RESISTANCE FORCE SWITCH
X = DON’T CARE
MAX4555/MAX4556 shown at end of data sheet.
________________________________________________________________ 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 408-737-7600 ext. 3468.
MAX4554/MAX4555/MAX4556
General Description
The MAX4554/MAX4555/MAX4556 are CMOS analog ICs
configured as force-sense switches for Kelvin sensing in
automated test equipment (ATE). Each part contains
high-current, low-resistance switches for forcing current,
and higher resistance switches for sensing a voltage or
switching guard signals. The MAX4554 contains two
force switches, two sense switches, and two guard
switches configured as two triple-pole/single-throw
(3PST) normally open (NO) switches. The MAX4555 contains four independent single-pole/single-throw (SPST)
normally closed (NC) switches, two force switches, and
two sense switches. The MAX4556 contains three independent single-pole/double-throw (SPDT) switches, of
which one is a force switch and two are sense switches.
These devices operate from a single supply of +9V to
+40V or dual supplies of ±4.5V to ±20V. On-resistance
(6Ω max) is matched between switches to 1Ω max.
Each switch can handle Rail-to-Rail® analog signals.
The off-leakage current is only 0.25nA at +25°C and
2.5nA at +85°C. The MAX4554 is also fully specified for
+20V and -10V operation.
ABSOLUTE MAXIMUM RATINGS
(Voltages referenced to GND)
V+ ...........................................................................-0.3V to +44V
V- ............................................................................-25V to +0.3V
V+ to V-...................................................................-0.3V to +44V
All Other Pins (Note 1) ..........................(V- - 0.3V) to (V+ + 0.3V)
Continuous Current into Force Terminals .......................±100mA
Continuous Current into Any Other Terminal....................±30mA
Peak Current into Force Terminals
(pulsed at 1ms, 10% duty cycle).................................±300mA
Peak Current into Any Other Terminal
(pulsed at 1ms, 10% duty cycle).................................±100mA
ESD per Method 3015.7 ..................................................>2000V
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C) ...........842mW
Narrow SO (derate 8.7mW/°C above +70°C) ...............696mW
Operating Temperature Ranges
MAX455_C_ E ......................................................0°C to +70°C
MAX455_E_ E ...................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
Note 1: Signals on analog or digital pins exceeding V+ or V- are clamped by internal diodes. Limit forward diode current to maximum current rating.
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—MAX4554 (+20V, -10V Supplies)
(V+ = +20V, V- = -10V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
6Ω ANALOG SWITCH (FORCE)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
VCOMF,
VNOF_
(Note 3)
C, E
RON
VCOMF = 10V, ICOMF = 10mA
∆RON
VCOMF = 10V, ICOMF = 10mA
V-
+25°C
3.5
C, E
+25°C
0.4
C, E
V
6
Ω
1
1.5
RFLAT(ON)
VCOMF = +5V, 0V, -5V;
ICOMF = 10mA
+25°C
NOF_ Off-Leakage Current
INOF_(OFF)
V+ = 22V, V- = -11V,
VCOMF = ±10V, VNOF_ = 10V
+25°C
-0.25
C, E
-2.5
COMF Off-Leakage Current
ICOMF(OFF)
V+ = 22V, V- = -11V,
VCOMF = ±10V, VNOF_ = 10V
COMF On-Leakage Current
ICOMF(ON)
Q
0.5
C, E
1.5
2.0
+25°C
-0.5
C, E
-2.5
V+ = 22V, V- = -11V,
VCOMF = ±10V
+25°C
-0.5
C, E
-10
VCOMF = 0, Figure 13
C, E
(Note 3)
C, E
±
Charge Injection
V+
7
On-Resistance Flatness
(Note 5)
±
MAX4554/MAX4555/MAX4556
Force-Sense Switches
0.03
0.25
2.5
0.03
0.5
2.5
0.06
0.5
10
80
Ω
Ω
nA
nA
nA
pC
60Ω ANALOG SWITCH (SENSE-GUARD)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
2
VCOMS,
VCOMG,
VNOS_,
VNOG_
RON
VCOM_ = 10V, ICOM_ = 1mA
∆RON
VCOM_ = 10V, ICOM_ = 1mA
+25°C
V-
34
C, E
+25°C
V+
V
60
Ω
70
5
C, E
_______________________________________________________________________________________
8
10
Ω
Force-Sense Switches
(V+ = +20V, V- = -10V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
On-Resistance Flatness
(Note 5)
RFLAT(ON)
VCOM_ = +5V, 0V, -5V;
ICOM_ = 10mA
NOS_, NOG_ Off-Leakage
Current
INOS_(OFF),
INOG_(OFF)
V+ = 22V; V- = -11V; VCOM_ = ±10V;
VNOS_, VNOG_ = ±10V
COMS, COMG Off-Leakage
Current
ICOMS(OFF),
ICOMG(OFF)
V+ = 22V; V- = -11V; VCOM_ = ±10V;
VNOS_, VNOG_ = ±10V
COMS, COMG On-Leakage
Current
ICOMS(ON),
ICOMG(ON)
V+ = 22V, V- = -11V, VCOM_ = ±10V
Charge Injection
Q
VCOM_ = 0, Figure 13
TA
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
MIN
-0.25
-2.5
-0.25
-2.5
-0.5
-5.0
TYP
(Note 2)
MAX
3.5
9
10
0.25
2.5
0.25
2.5
0.5
5.0
0.02
0.02
0.04
6
UNITS
Ω
nA
nA
nA
pC
LOGIC INPUT
IN_, EN Input Logic
Threshold High
VIN_H,
V ENH
C, E
IN_, EN Input Logic
Threshold Low
VIN_L,
V ENL
C, E
0.8
1.6
VIN_ = V EN = 0 or VL
C, E
-0.5
0.03
0.5
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
150
300
350
300
350
300
350
300
350
500
600
275
350
22
pF
IN_, EN Input Current Logic
High or Low
IIN_H, IIN_L,
I ENH , I ENL
1.6
2.4
V
V
µA
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time (Force)
tON
VCOMF = 3V, RL = 300Ω,
Figure 10
Turn-On Time
(Sense-Guard)
tON
VCOMS, VCOMG = 10V; RL = 1kΩ;
Figure 10
Turn-Off Time (Force)
tOFF
VCOMF = 3V, RL = 300Ω,
Figure 10
Turn-Off Time
(Sense-Guard)
tOFF
VCOMS, VCOMG = 10V; RL = 1kΩ;
Figure 10
Enable Time On
tEN
VCOM_ = 10V, Figure 11
Enable Time Off
tEN
VCOM_ = 10V, Figure 11
NOF_ Off-Capacitance
150
130
130
375
170
ns
ns
ns
ns
ns
ns
COFF
VNOF = GND, f = 1MHz, Figure 14
NOS_, NOG_
Off-Capacitance
COFF
VNOS_, VNOG_ = GND; f = 1MHz;
Figure 14
+25°C
7
pF
COMF Off-Capacitance
COFF
VCOMF = GND, f = 1MHz, Figure 14
+25°C
50
pF
COMS, COMG
Off-Capacitance
COFF
VCOMS, VCOMG = GND; f = 1MHz;
Figure 14
+25°C
15
pF
COMF On-Capacitance
CON
VCOMF = GND, f = 1MHz, Figure 14
+25°C
130
pF
COMS, COMG
On-Capacitance
CON
VCOMS, VCOMG = GND; f = 1MHz;
Figure 14
+25°C
30
pF
Total Harmonic Distortion
(Force)
THD
+25°C
0.007
%
Off Isolation (Force)
VISO
+25°C
-30
dB
RIN_ = 50Ω, ROUT = 50Ω, f = 1MHz,
VCOM_ = 100mVRMS, Figure 15
_______________________________________________________________________________________
3
MAX4554/MAX4555/MAX4556
ELECTRICAL CHARACTERISTICS—MAX4554 (+20V, -10V Supplies) (continued)
ELECTRICAL CHARACTERISTICS—MAX4554 (+20V, -10V Supplies) (continued)
(V+ = +20V, V- = -10V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
POWER SUPPLY
Power-Supply Range
V+, VL, V-
VL ≥ 4.5V
C, E
±4.5
±20
+25°C
-1.0
1.0
C, E
-5.0
5.0
V+ Supply Current
I+
V+ = 22V; V- = -11V;
V EN, V IN_ = 0 or VL
V- Supply Current
I-
V+ = 22V; V- = -11V;
V EN, V IN_ = 0 or VL
+25°C
-1.0
1.0
C, E
-5.0
5.0
VL Supply Current
IL+
V+ = 22V; V- = -11V;
V EN, V IN_ = 0 or VL
+25°C
-1.0
1.0
C, E
-5.0
5.0
IGND
V+ = 22V; V- = -11V;
V EN, V IN_ = 0 or VL
+25°C
-1.0
1.0
C, E
-5.0
5.0
Ground Current
V
µA
µA
µA
µA
ELECTRICAL CHARACTERISTICS—MAX4554 (±15V Supplies)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
6Ω ANALOG SWITCH (FORCE)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
VCOMF,
VNOF_
(Note 3)
RON
VCOMF = ±10V, ICOMF = 10mA
∆RON
VCOMF = ±10V, ICOMF = 10mA
On-Resistance Flatness
(Note 5)
RFLAT(ON)
VCOMF = +5V, 0V, -5V;
ICOMF = 10mA
NOF_ Off-Leakage Current
INOF_(OFF)
V+ = 16.5V, V- = -16.5V,
VCOMF = ±10V, VNOF_ =
COMF Off-Leakage Current
ICOMF(OFF)
V+ = 16.5V, V- = -16.5V,
VCOMF = ±10V, VNOF_ =
COMF On-Leakage Current
ICOMF(ON)
Q
V-
+25°C
4
C, E
V+
V
6
Ω
7
+25°C
0.5
C, E
1
1.5
+25°C
0.1
C, E
1
1.5
+25°C
-0.25
10V
C, E
-2.5
+25°C
-0.5
±
Charge Injection
C, E
±
MAX4554/MAX4555/MAX4556
Force-Sense Switches
10V
C, E
-5.0
V+ = 16.5V, V- = -16.5V,
VCOMF = ±10V
+25°C
-0.5
C, E
-10
VCOMF = 0, Figure 13
+25°C
(Note 3)
C, E
0.03
0.25
2.5
0.03
0.5
5.0
0.06
0.5
10
100
Ω
Ω
nA
nA
nA
pC
60Ω ANALOG SWITCH (SENSE-GUARD)
Analog Signal Range
On-Resistance
4
VCOMS,
VCOMG,
VNOS_,
VNOG_
RON
VCOM_ = ±10V, ICOM_ = 1mA
+25°C
V-
38
C, E
_______________________________________________________________________________________
V+
V
60
Ω
70
Force-Sense Switches
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
On-Resistance Match
(Note 4)
SYMBOL
∆RON
CONDITIONS
TA
+25°C
VCOM_ = ±10V, ICOM_ = 1mA
RFLAT(ON)
VCOM_ = +5V, 0V, -5V; ICOM_ = 1mA
NOS_, NOG Off-Leakage
Current
INOS_(OFF),
INOG_(OFF)
V+ = 16.5V; V- = -16.5V;
VCOM_ = ±10V; VNOS_, VNOG_ =
COMS, COMG Off-Leakage
Current
ICOMS(OFF),
ICOMG(OFF)
V+ = 16.5V; V- = -16.5V;
VCOM_ = ±10V; VNOS_, VNOG_ =
COMS, COMG On-Leakage
Current
ICOMS(ON),
ICOMG(ON)
5
MAX
9
10
+25°C
1.5
C, E
5
6
+25°C
-0.25
±
10V
C, E
-2.5
+25°C
-0.25
±
Q
TYP
(Note 2)
C, E
On-Resistance Flatness
(Note 5)
Charge Injection
MIN
10V
C, E
-2.5
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V
+25°C
-0.5
C, E
-5.0
VCOM_ = 0, Figure 13
+25°C
0.01
0.25
2.5
0.01
0.25
2.5
0.02
0.5
5.0
4
UNITS
Ω
Ω
nA
nA
nA
pC
LOGIC INPUT
IN_, EN Input Logic
Threshold High
VIN_H,
V ENH
C, E
IN_, EN Input Logic
Threshold Low
VIN_L,
V ENL
C, E
0.8
1.6
V EN = 0 or VL
C, E
-0.5
0.03
0.5
135
275
IN_, EN Input Current Logic
High or Low
IIN_H, IIN_L,
I ENH , I ENL
1.6
2.4
V
V
µA
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time (Force)
tON
VCOM_ = ±10V, RL = 300Ω,
Figure 10
+25°C
Turn-On Time
(Sense-Guard)
tON
VCOM_ = ±10V, RL = 1kΩ,
Figure 10
+25°C
Turn-Off Time (Force)
tOFF
VCOM_ = ±10V, RL = 300Ω,
Figure 10
+25°C
Turn-Off Time
(Sense-Guard)
tOFF
VCOM_ = ±10V, RL = 1kΩ,
Figure 10
+25°C
Enable Time On
tEN
VCOM_ = ±10V, RL = 300Ω,
Figure 11
+25°C
Enable Time Off
tEN
VCOM_ = ±10V, RL = 300Ω,
Figure 11
+25°C
C, E
325
135
C, E
225
275
170
C, E
275
325
135
C, E
225
275
310
C, E
500
600
170
C, E
300
400
ns
ns
ns
ns
ns
ns
NOF_ Off-Capacitance
COFF
VNOF = GND, f = 1MHz, Figure 14
+25°C
22
pF
NOS_, NOG_
Off-Capacitance
COFF
VNOS_, VNOG_ = GND; f = 1MHz;
Figure 14
+25°C
9
pF
COMF Off-Capacitance
COFF
VCOMF = GND, f = 1MHz, Figure 14
+25°C
29
pF
COMS, COMG
Off-Capacitance
COFF
VCOMS_, VCOMG _= GND; f = 1MHz;
Figure 14
+25°C
9
pF
_______________________________________________________________________________________
5
MAX4554/MAX4555/MAX4556
ELECTRICAL CHARACTERISTICS—MAX4554 (±15V Supplies) (continued)
ELECTRICAL CHARACTERISTICS—MAX4554 (±15V Supplies) (continued)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
COMF On-Capacitance
CON
VCOMF = GND, f = 1MHz,
Figure 14
+25°C
107
pF
COMS, COMG
On-Capacitance
CON
VCOMS, VCOMG_ = GND; f = 1MHz;
Figure 14
+25°C
29
pF
Total Harmonic Distortion
(Force)
THD
+25°C
0.007
%
Off Isolation (Force)
VISO
+25°C
-30
dB
POWER SUPPLY
Power-Supply Range
V+, VL, V-
RIN_ = 50Ω, ROUT = 50Ω, f = 1MHz,
VCOM_ = 100mVRMS, Figure 15
VL ≥ 4.5V
V+ Supply Current
I+
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
V- Supply Current
I-
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
VL Supply Current
IL+
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
IGND
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
Ground Current
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
±4.5
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
0.001
0.001
0.001
±20
1.0
5.0
1.0
5.0
1.0
5.0
1.0
5.0
V
µA
µA
µA
µA
ELECTRICAL CHARACTERISTICS—MAX4555 (±15V Supplies)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
6Ω ANALOG SWITCH (FORCE)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
VCOM_, VNO_ (Note 3)
C, E
RON
VCOM_ = ±10V, ICOM_ = 10mA
∆RON
VCOM_ = ±10V, ICOM_ = 10mA
V-
+25°C
3.8
C, E
+25°C
0.3
C, E
VCOM_ = +5V, 0V, -5V;
ICOM_ = 10mA
+25°C
NC_ Off-Leakage Current
INC_(OFF)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V, VNO_ = 10V
+25°C
-0.25
C, E
-2.5
COM_ Off-Leakage Current
ICOM_(OFF)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V, VNO_ = 10V
+25°C
-0.5
C, E
-5.0
COM_ On-Leakage Current
ICOM_(ON)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V
+25°C
-0.5
C, E
-10
VCOM_ = 0, Figure 13
+25°C
0.05
C, E
±
6
Q
V
6
Ω
1
1.5
RFLAT(ON)
Charge Injection
V+
7
On-Resistance Flatness
(Note 5)
±
MAX4554/MAX4555/MAX4556
Force-Sense Switches
1
1.5
0.03
0.25
2.5
0.03
0.5
5.0
0.06
0.5
10
100
_______________________________________________________________________________________
Ω
Ω
nA
nA
nA
pC
Force-Sense Switches
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
30Ω ANALOG SWITCH (SENSE-GUARD)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
VCOM_, VNO_ (Note 3)
C, E
RON
VCOM_ = ±10V, ICOM_ = 10mA
∆RON
VCOM_ = ±10V, ICOM_ = 10mA
V-
+25°C
15
C, E
+25°C
0.6
C, E
Ω
4
5
RFLAT(ON)
VCOM_ = +5V, 0V, -5V;
ICOM_ = 10mA
+25°C
NC_ Off-Leakage Current
INC_(OFF)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V, VNO_ = 10V
+25°C
-0.3
C, E
-2.5
COM_ Off-Leakage Current
ICOM_(OFF)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V, VNO_ = 10V
+25°C
-0.3
C, E
-2.5
COM_ On-Leakage Current
INC_(ON)
V+ = 16.5V, V- = -16.5V,
VNC_ = ±10V
+25°C
-0.6
C, E
-5.0
VCOM_ = 0, Figure 13
+25°C
0.6
C, E
±
±
Q
V
30
45
On-Resistance Flatness
(Note 5)
Charge Injection
V+
5
6
0.01
0.3
2.5
0.01
0.3
2.5
0.02
0.6
5.0
4
Ω
Ω
nA
nA
nA
pC
LOGIC INPUT
IN_ Input Logic Threshold
High
VIN_H
C, E
IN_ Input Logic Threshold
Low
VIN_L
C, E
0.8
1.6
IN_ Input Current Logic
High or Low
IIN_H,
IIN_L
VIN_ = 0.8V or 2.4V
C, E
-0.5
0.03
1.6
2.4
V
V
0.5
µA
SWITCH DYNAMIC CHARACTERISTICS
Turn-On Time (Force)
tON
VCOM_ = ±3V, RL = 300Ω,
Figure 10
+25°C
155
Turn-On Time
(Sense-Guard)
tON
VCOM_ = ±10V, RL = 1kΩ,
Figure 10
+25°C
Turn-Off Time (Force)
tOFF
VCOM_ = ±3V, RL = 300Ω,
Figure 10
+25°C
Turn-Off Time
(Sense-Guard)
tOFF
VCOM_ = ±10V, RL = 1kΩ,
Figure 10
+25°C
COM_ Off-Capacitance
(Force)
COFF
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
29
pF
COM_ On-Capacitance
(Sense-Guard)
CON
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
9
pF
COM_ On-Capacitance
(Force)
CON
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
107
pF
COM_ Off-Capacitance
(Sense-Guard)
COFF
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
29
pF
C, E
275
325
125
C, E
225
275
190
C, E
275
325
125
C, E
225
275
ns
ns
ns
ns
_______________________________________________________________________________________
7
MAX4554/MAX4555/MAX4556
ELECTRICAL CHARACTERISTICS—MAX4555 (±15V Supplies) (continued)
ELECTRICAL CHARACTERISTICS—MAX4555 (±15V Supplies) (continued)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
NC_ Off-Capacitance
(Force)
COFF
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
22
pF
NC_ Off-Capacitance
(Sense-Guard)
COFF
VCOM_, VNO_ = GND; f = 1MHz;
Figure 14
+25°C
9
pF
Total Harmonic Distortion
(Force)
THD
+25°C
0.007
%
Off Isolation (Force)
(Note 6)
VISO
+25°C
-38
dB
POWER SUPPLY
Power-Supply Range
RIN = 50Ω, ROUT = 50Ω, f = 1MHz,
VCOM_ = 100mVRMS, Figure 15
V+, VL, V-
V+ Supply Current
I+
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
V- Supply Current
I-
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
VL Supply Current
IL+
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
IGND
V+ = 16.5V; V- = -16.5V;
V EN, V IN_ = 0 or V+
Ground Current
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
±4.5
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
0.001
0.001
0.001
0.001
±20
1.0
5.0
1.0
5.0
1.0
5.0
1.0
5.0
V
µA
µA
µA
µA
ELECTRICAL CHARACTERISTICS—MAX4556 (±15V Supplies)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
6Ω ANALOG SWITCH (FORCE)
Analog Signal Range
On-Resistance
On-Resistance Match
(Note 4)
VCOM1,
VNO1, VNC1
(Note 3)
C, E
RON
VCOM1 = ±10V, ICOM1 = 10mA
∆RON
VCOM1 = ±10V, ICOM1 = 10mA
RFLAT(ON)
VCOM1 = +5V, 0V, -5V;
ICOM1 = 10mA
NO1, NC1 Off-Leakage
Current
INO1(OFF),
INC1(OFF)
V+ = 16.5V; V- = -16.5V;
VCOM1 = ±10V; VNO1, VNC1 =
COM1 Off-Leakage Current
ICOM1(OFF)
V+ = 16.5V, V- = -16.5V,
VCOM1 = ±10V, VNO1 = 10V
COM1 On-Leakage Current
ICOM1(ON)
8
Q
+25°C
3.8
C, E
+25°C
0.3
C, E
10V
V+
V
6
Ω
7
1
1.5
0.05
C, E
1
1.5
+25°C
-0.25
C, E
-2.5
+25°C
-0.5
C, E
-5.0
V+ = 16.5V, V- = -16.5V,
VCOM1 = ±10V
+25°C
-0.5
C, E
-10
VCOM1 = 0, Figure 13
+25°C
±
Charge Injection
V-
+25°C
On-Resistance Flatness
(Note 5)
±
MAX4554/MAX4555/MAX4556
Force-Sense Switches
0.03
0.25
2.5
0.03
0.5
5.0
0.06
0.5
10
100
_______________________________________________________________________________________
Ω
Ω
nA
nA
nA
pC
Force-Sense Switches
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
TA
MIN
TYP
(Note 2)
MAX
UNITS
60Ω ANALOG SWITCH (SENSE-GUARD)
Analog Signal Range
VCOM_,
VNO_, VNC_
(Note 3)
C, E
On-Resistance Flatness
(Note 5)
RFLAT(ON)
VCOM_ = +5V, 0V, -5V;
ICOM_ = 10mA
NO_, NC Off-Leakage
Current
INO_(OFF),
INC_(OFF)
V+ = 16.5V; V- = -16.5V;
VCOM_ = ±10V; VNO_, VNC_ =
±
COM_ Off-Leakage Current
ICOM_(OFF)
V+ = 16.5V; V- = -16.5V;
VCOM_ = ±10V; VNO_, VNC_ =
±
COM_ On-Leakage Current
ICOM_(ON)
V+ = 16.5V, V- = -16.5V,
VCOM_ = ±10V
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
VCOM_ = 0, Figure 13
+25°C
On-Resistance
On-Resistance Match
(Note 4)
Charge Injection
RON
VCOM_ = ±10V, ICOM_ = 10mA
∆RON
VCOM_ = ±10V, ICOM_ = 10mA
Q
10V
10V
V36
5
0.6
-0.25
-2.5
-0.25
-2.5
-0.5
-5.0
0.01
0.01
0.02
V+
V
60
70
9
10
5
6
0.25
2.5
0.25
2.5
0.5
5.0
Ω
5
Ω
Ω
nA
nA
nA
pC
LOGIC INPUT
IN_ Input Logic Threshold
High
VIN_H
C, E
IN_ Input Logic Threshold
Low
VIN_L
C, E
0.8
1.6
IN_ Input Current Logic
High or Low
IIN_H,
IIN_L
C, E
-0.5
0.03
0.5
150
250
125
300
225
275
VIN_ = 0 or VL
1.6
2.4
V
V
µA
SWITCH DYNAMIC CHARACTERISTICS
+25°C
Transition Time (Force)
tTRANS
VCOM_ = ±10V, RL = 300Ω,
Figure 10
Transition Time
(Sense-Guard)
tTRANS
VCOM_ = ±10V, RL = 1kΩ,
Figure 10
C, E
+25°C
C, E
Break-Before-Make Time
tBBM
VCOM_ = ±10V, RL = 1kΩ, Figure 12
+25°C
NO1, NC1 Off-Capacitance
(Force)
COFF
VNO1, VNC1 = GND; f = 1MHz;
Figure 14
COM1 On-Capacitance
(Force)
CON
NO_, NC_ Off-Capacitance
(Sense-Guard)
ns
15
ns
+25°C
21
pF
VCOM1 = GND, f = 1MHz,
Figure 14
+25°C
137
pF
COFF
VNO_, VNC_ = GND; f = 1MHz;
Figure 14
+25°C
7
pF
COM_ On-Capacitance
(Sense-Guard)
CON
VCOM_ = GND, f = 1MHz,
Figure 14
+25°C
30
pF
Total Harmonic Distortion
(Force)
THD
+25°C
0.007
%
Off Isolation (Force)
VISO
+25°C
-30
dB
RIN = 50Ω, ROUT = 50Ω, f = 1MHz,
VCOM_ = 100mVRMS, Figure 15
1
ns
_______________________________________________________________________________________
9
MAX4554/MAX4555/MAX4556
ELECTRICAL CHARACTERISTICS—MAX4556 (±15V Supplies) (continued)
MAX4554/MAX4555/MAX4556
Force-Sense Switches
ELECTRICAL CHARACTERISTICS—MAX4556 (±15V Supplies) (continued)
(V+ = +15V, V- = -15V, VL = 5V, GND = 0V, VIN_H = 2.4V, VIN_L = 0.8V, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
POWER SUPPLY
Power-Supply Range
V+, VL, V-
CONDITIONS
VL ≥ 4.5V
V+ Supply Current
I+
V+ = 16.5V, V- = -16.5V,
VIN_ = 0 or VL
V- Supply Current
I-
V+ = 16.5V, V- = -16.5V,
VIN_ = 0 or VL
VL Supply Current
IL+
V+ = 16.5V, V- = -16.5V,
VIN_ = 0 or VL
IGND
V+ = 16.5V, V- = -16.5V,
VIN_ = 0 or VL
Ground Current
Note 2:
Note 3:
Note 4:
Note 5:
10
TA
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
+25°C
C, E
MIN
±4.5
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
-1.0
-5.0
TYP
(Note 2)
0.001
0.001
0.001
0.001
MAX
±20
1.0
5.0
1.0
5.0
1.0
5.0
1.0
5.0
The algebraic convention is used in this data sheet; the most negative value is shown in the minimum column.
Guaranteed by design.
∆RON = ∆RON(MAX) - ∆RON(MIN).
Resistance flatness is defined as the difference between the maximum and the minimum value of on-resistance as
measured over the specified analog signal range.
______________________________________________________________________________________
UNITS
V
µA
µA
µA
µA
Force-Sense Switches
MAX4554
FORCE SWITCH ON-RESISTANCE
vs. VCOM AND TEMPERATURE
RDS(ON) (Ω)
25
5
20
MAX4555 SENSE
15
55
50
TA = +85°C
4
3
TA = +25°C
2
0
5
10
15
-10
VCOM (V)
-5
0
5
10
15
-15
20
-5
5
10
15
ON-LEAKAGE CURRENT
vs. TEMPERATURE
100
MAX4554/5/6-04
100
MAX4555 SENSE
V+ = 15V,
V- = -15V,
VCOM = 10V
10
ON-LEAKAGE (nA)
MAX4554/MAX4556
SENSE & GUARD
10
0
VCOM (V)
SWITCH ON-RESISTANCE vs. VCOM
(SINGLE +15V SUPPLY)
SWITCH ON-RESISTANCE (Ω)
-10
VCOM (V)
MAX4554/5/6-05
-5
TA = -40°C
10
0
-10
30
15
0
-15
TA = +25°C
35
20
1
FORCE
5
40
25
TA = -40°C
10
TA = +85°C
45
RDS(ON) (Ω)
30
MAX4554/5/6-02
MAX4554/MAX4556
SENSE & GUARD
60
±
FORCE
1
0.1
SENSE & GUARD
0.01
FORCE
0.001
0.0001
1
-50
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
75
100
MAX4554
CHARGE INJECTION vs. VCOM
(+20V, -10V SUPPLIES)
60
1
FORCE
0.1
FORCE
80
125
MAX4554/5/6-07
100
Q (pC)
OFF-LEAKAGE (nA)
50
OFF-LEAKAGE CURRENT
vs. TEMPERATURE
V+ = 15V,
V- = -15V,
VNC OR VNO = ±10V
VCOM = 10V
10
25
0
TEMPERATURE (°C)
MAX4554/5/6-06
100
-25
VCOM (V)
±
SWITCH ON-RESISTANCE (Ω)
35
6
MAX4554/5/6-01
40
SENSE/GUARD SWITCH ON-RESISTANCE
vs. VCOM AND TEMPERATURE
MAX4554/5/6-03
SWITCH ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
40
20
0.01
SENSE & GUARD
0.001
SENSE & GUARD
0
-20
-40
0.0001
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
-10
-5
0
5
10
15
20
VCOM (V)
______________________________________________________________________________________
11
MAX4554/MAX4555/MAX4556
__________________________________________Typical Operating Characteristics
(V+ = +15V, V- = -15V, GND = 0V, TA = +25°C, unless otherwise noted.)
____________________________________Typical Operating Characteristics (continued)
(V+ = +15V, V- = -15V, GND = 0V, TA = +25°C, unless otherwise noted.)
FORCE
450
tEN(ON)
400
60
180
MAX4554/5/6-09
500
MAX4554/5/6-08
100
80
MAX4555/4556
ON/OFF/TRANSITION TIMES vs.
TEMPERATURE (+20V/-10V SUPPLIES)
MAX4554
ON/OFF/ENABLE TIMES vs.
TEMPERATURE (+20V, -10V SUPPLIES)
160
0
120
300
250
TIME (ns)
TIME (ns)
20
tEN(OFF)
200
100
-20
80
40
tON
20
tOFF
50
-40
0
-15
-10
-5
0
5
10
15
0
-40
-15
VCOM (V)
10
35
60
-40
85
-15
TEMPERATURE (°C)
35
60
LOGIC-LEVEL THRESHOLD
vs. LOAD VOLTAGE
5
LOGIC-LEVEL THRESHOLD (V)
A: I+ = 16.5V
B: I- = -16.5V
10 C: IL = 5.5V
1
0.1
A
B
MAX4554/5/6-12
6
MAX4554/5/6-11
100
0.01
10
TEMPERATURE (°C)
SUPPLY CURRENT
vs. TEMPERATURE
I+, I-, IL (µA)
MAX4556 tTRANS
100
60
150
SENSE & GUARD
MAX4555 tON/tOFF
140
350
40
MAX4554/5/6-10
MAX4555/MAX4556
CHARGE INJECTION vs. VCOM
(+15V SUPPLIES)
Q (pC)
4
3
2
1
0.001
C
0.0001
-75 -55 -50 -25
0
25
0
50
75
5
10
15
20
FORCE SWITCH FREQUENCY RESPONSE
FORCE SWITCH TOTAL HARMONIC
DISTORTION vs. FREQUENCY
120
90
60
30
OFF LOSS
-60
-70
-80
0
-30
-60
ON PHASE
-90
-120
-150
-120
-180
0.1
1
10
FREQUENCY (MHz)
100
1000
V+ = +15V
V- = -15V
5Vp-p, 600Ω IN & OUT
10
THD (%)
-20
-30
-40
-50
100
180
150
PHASE (degrees)
MAX4554/5/6-13
ON LOSS
25
MAX4554/5/6-14
VL (V)
-90
-100
-110
12
0
85 100
TEMPERATURE (°C)
0
-10
SWITCH LOSS (dB)
MAX4554/MAX4555/MAX4556
Force-Sense Switches
1
0.1
0.01
0.001
10
100
1k
10k
FREQUENCY (Hz)
______________________________________________________________________________________
100k
85
Force-Sense Switches
PIN
NAME
FUNCTION
MAX4554
MAX4555
MAX4556
1
—
—
NOG1
—
—
1, 2
NO3, NO2
2
—
—
NOS1
—
2, 15*,
10*, 7
14*, 15, 16
COM1, COM2
COM3, COM4
3*
—
—
NOF1*
—
3, 14, 11, 6
—
NC1, NC2,
NC3, NC4
—
—
3*
NO1*
4
4
4
V-
Negative Analog Supply Voltage Input. Connect to GND for singlesupply operation.
5
5
5
GND
Ground. Connect to digital ground. (Analog signals have no ground
reference; they are limited to V+ and V-.)
Analog Guard Channel 1 Normally Open Terminal
Analog Signal Normally Open Terminals
Analog Sense Channel 1 Normally Open Terminal
Analog Signal Common Terminals. COM2 and COM3 are low-resistance (force) switches on the MAX4555. COM1 is a low-resistance
(force) switch on the MAX4556.
Analog Force Channel 1 Normally Open Terminal
Analog Signal Normally Closed Pins. NC2 and NC3 are low-resistance
(force) switches.
Analog Force Signal Normally Open Terminal
6*
—
—
NOF2*
—
—
6*
NC1*
Analog Force Channel 2 Normally Open Terminal
Analog Force Signal Normally Closed Terminal
7
—
—
NOS2
Analog Sense Channel 2 Normally Open Terminal
—
—
7, 8
NC2, NC3
8
—
—
NOG2
9
—
—
EN
11, 10
1, 16, 9, 8
9, 10, 11
IN1, IN2,
IN3, IN4
12
12
12
VL
Logic-Level Positive Supply Input. Connect to logic (+5V) supply. Can
be connected to V+ for single-supply operation.
13
13
13
V+
Positive Analog Supply Voltage Input. Internally connected to substrate.
14*
—
—
COMF*
Analog Force Channel Common Terminal
15
—
—
COMS
Analog Sense Channel Common Terminal
16
—
—
COMG
Analog Guard Channel Common Terminal
Analog Signal Normally Closed Terminal
Analog Guard Channel 2 Normally Open Terminal
Enable Logic-Level Digital Input. Connect to GND to enable all switches.
Logic-Level Digital Inputs. See Truth Tables.
* Indicates high-current, low-resistance (force) switch terminal.
Note: NO_, NC_, and COM_ pins are identical and interchangeable. Any may be considered as an input or output; signals pass
equally well in either direction.
______________________________________________________________________________________
13
MAX4554/MAX4555/MAX4556
Pin Description
MAX4554/MAX4555/MAX4556
Force-Sense Switches
______________Force-Sense Philosophy
When a precise voltage must be applied to a load that
draws appreciable current, the resistance of the conductors connecting the source and the load can
degrade the load voltage. The resistance of the conductors forms a voltage divider with the load, so that
the load voltage is lower than the source voltage. The
greater the distance between the source and the load,
and the greater the current or conductor resistance, the
greater the degradation. The resulting signal reduction
can be overcome and the signal at the load guaranteed
by using a 4-wire technique known as Kelvin sensing,
or force-sense.
The basic idea behind the force-sense philosophy is to
use four wires, forcing a voltage or current through two
high-current wires to the load, and measuring (sensing)
the voltage with two separate wires that carry very low
or negligible current. One of two basic configurations is
used, depending on whether or not feedback is employed:
1) The sensed voltage can be completely independent
of the forced voltage or current, as in the case of a
4-wire ohmmeter, where a constant current is forced
through one pair of wires and the voltage at the
resistor is measured by another pair.
2) The sensed voltage can be part of a feedback circuit to force the load voltage to the desired value,
as in the case of a 4-wire power supply. (In rare
cases, this method is also used to measure resistance; the source is forced to produce a desired
voltage in the resistor, and the source current
required to achieve this voltage is measured.)
In all cases, the resistance of the high-current conductors can be ignored and the sensed voltage is an accurate measure of the load (or resistor’s) voltage, despite
appreciable voltage loss in the wires connecting the
source and load.
There are two limitations to this scheme. First, the maximum source voltage (compliance) must be able to
overcome the combined voltage loss of the load and
the connecting wires. In other words, the conductors in
the force circuit can have significant resistance, but
there is a limit. Second, the impedance of the sensing
circuit (typically a voltmeter, A/D converter, or feedback
amplifier) must be very high compared to the load
resistance and the sense wire resistance. These limitations are usually simple to overcome. The source compliance is usually required to be only a volt more than
the load voltage, and the sense circuit usually has a
multimegohm impedance. Typical 4-wire force-sense
configurations are shown in Figure 1.
14
4-WIRE RESISTANCE MEASUREMENT (CONSTANT CURRENT)
FORCE CURRENT
VOLTAGE
MEASUREMENT
SENSE VOLTAGE
MEASURED
RESISTANCE
V
SENSE VOLTAGE
FORCE CURRENT
CURRENT SOURCE
WIRE AND TERMINAL RESISTANCE
4-WIRE POWER SUPPLY
FORCE CURRENT
VOLTAGE
MEASUREMENT
FEEDBACK
V
SENSE VOLTAGE
LOAD
SENSE VOLTAGE
FORCE CURRENT
CURRENT SOURCE
WIRE AND TERMINAL RESISTANCE
4-WIRE RESISTANCE MEASUREMENT (CONSTANT VOLTAGE)
V
FORCE VOLTAGE
SENSE VOLTAGE
FEEDBACK
MEASURED
RESISTANCE
V
SENSE VOLTAGE
VOLTAGE
MEASUREMENT
FORCE VOLTAGE
VOLTAGE SOURCE
WIRE AND TERMINAL RESISTANCE
ARROWS INDICATE SIGNAL DIRECTION, NOT POLARITY
Figure 1. 4-Wire Force-Sense Measurements
______________________________________________________________________________________
Force-Sense Switches
When measuring a precise voltage from a high-resistance source, or when measuring a very small current
or forcing it into a load, unwanted leakage currents can
degrade the results. These leakage currents may exist
in the insulation of wires connecting the source and the
measuring device. Higher source voltages, higher
source impedances, longer wires, lower currents, and
higher temperatures further degrade the measurement.
The effect has both DC and low-frequency AC components; AC signals are generally capacitively coupled
into the high-impedance source and wiring. The AC
and DC effects are hard to separate, and are generally
grouped under the designation “low-frequency noise.”
This signal degradation can be overcome and the measured signal guaranteed by using a 3-wire technique
known as guarding.
A “guard,” “guard channel,” or “driven guard” is formed
by adding a third wire to a 2-wire measurement. It consists of a physical barrier (generally the surrounding
shield of a coaxial cable) that is actively forced to the
same voltage as is being measured on its inner conductor. The forcing of the driven guard is from the output of
a low-impedance buffer amplifier whose high-impedance input is connected to the source. The idea is not
just to buffer or shield the signal with a low-impedance
source but, by forcing the shield to the same potential
as the signal, to also force the leakage currents
between the signal and the outside world to extremely
small values. Any unwanted leakage current from the
source must first go through the coaxial-cable insulation
to the shield. Since the shield is at the same potential,
there is virtually no unwanted leakage current, regardless of the insulation resistance. The shield itself can
have significant leakage currents to the outside world,
but it is separated from the measured signal.
The physical positioning of the guard around the signal
is extremely important in maintaining low leakage.
Since the guard can be at potentials far from ground,
conventional coaxial cable is often replaced by triaxial
cable (i.e., cable with a center conductor and two separate inner and outer shields). The signal is the center
conductor, the inner shield is the guard, and the outer
shield is the chassis ground. The outer shield isolates
the inner driven guard from ground, physically protects
the driven guard, and acts as a secondary Faraday
shield for external noise.
The physical guard must be maintained continuously
from the source to the measuring device, including
paths on printed circuit boards, where the guard
becomes extra traces surrounding the signal traces on
both sides (and above and below the signal traces on
multilevel boards.) This is one case where a ground
plane is not appropriate. In extreme cases, such as
with nano-voltmeters and femto-ammeters, printed circuit boards cannot be adequately shielded and are
eliminated from the guarded signal paths altogether.
Figure 2 shows both the basic 3-wire guarded measurement and a 5-wire variation, used for balanced signals that are elevated from ground potential. The 5-wire
configuration is really two 3-wire circuits sharing a common ground. Figure 2 also shows the configuration
using triaxial cable.
____Force-Sense-Guard Philosophy
Force-sense measurements are combined with guarded measurements when a wide range of voltages and
currents are encountered, or when voltage and current
must be accurately measured or controlled simultaneously. This frequently occurs in automatic test equipment (ATE) and in some critical physical or chemical
sensor applications where voltage and/or current measurements can span many decades. Two techniques
are used: 8-wire and 12-wire.
8-Wire Measurements
Figure 3 shows an 8-wire guarded force-sense power
supply. A precise voltage is forced to the load, and
load current is sensed without interacting with the output voltage, and without unwanted leakage currents.
Separate twin-axial, or “twinax” cable is used for each
of the positive and negative wires. Each cable has a
twisted-pair of wires surrounded by a common shield,
which is connected as the driven guard. Since the
force and sense wires are at approximately the same
potential, they can be protected by the same driven
guard. In critical applications, two special 4-wire cables
and connectors are substituted for the two twinax
cables and separate ground wire. These cables add a
second shield, which replaces the chassis-to-chassis
ground wire and reduces noise.
Figure 3 shows current sensing with a fixed precision
resistor and voltmeter, but other methods (such as op
amps with feedback) are frequently employed, particularly if current limiting is required. One of the advantages
of Figure 3’s circuit is that leakage in the current-sensing
path has no effect on the output voltage.
The two diodes in the force-sense feedback path protect the force-sense amplifier from operating open loop
if either the force or sense wires are disconnected from
the load. These diodes must have both lower forward
voltage and lower reverse leakage than the current
being measured.
______________________________________________________________________________________
15
MAX4554/MAX4555/MAX4556
__________________Guard Philosophy
MAX4554/MAX4555/MAX4556
Force-Sense Switches
BALANCED 5-WIRE GUARD CIRCUIT
BASIC 3-WIRE GUARD CIRCUIT
DRIVEN GUARD
(COAX CABLE SHIELD)
DRIVEN GUARD
(COAX CABLE SHIELD)
GUARD AMPLIFIER
GUARD AMPLIFIER
SENSE
VOLTAGE OR
CURRENT
LEAKAGE
CURRENT
VOLTAGE OR
CURRENT SOURCE
LEAKAGE
CURRENT
LEAKAGE
CURRENT
VOLTAGE OR
CURRENT SOURCE
3-WIRE GUARD CIRCUIT USING TRIAX
TRIAX CABLE
GUARD AMPLIFIER
SIGNAL
GUARD
GROUND
GUARD AMPLIFIER
SENSE
VOLTAGE OR
CURRENT
DRIVEN GUARD
(COAX CABLE SHIELD)
LEAKAGE
CURRENT
TRIAX CABLE/CONNECTOR
VOLTAGE OR
CURRENT SOURCE
CENTER WIRE
INNER SHEILD
OUTER SHEILD
Figure 2. 3-Wire and 5-Wire Guarded Measurements
16
______________________________________________________________________________________
SENSE
VOLTAGE
OR CURRENT
Force-Sense Switches
MAX4554/MAX4555/MAX4556
8-WIRE PRECISION SOURCE-MONITOR
FORCE-SENSE AMPLIFIER
V+
CURRENT SENSE
+FORCE
+SENSE
+DRIVEN GUARD
V
TWINAX CABLE
VV+
GUARD AMPLIFIER
VV+
LEAKAGE CURRENT
VOLTAGE SOURCE
LOAD
LEAKAGE CURRENT
V+
V-
GUARD AMPLIFIER
V+V
V
-DRIVEN GUARD
-SENSE
-FORCE
TWINAX CABLE
CURRENT SENSE
VFORCE-SENSE AMPLIFIER
Figure 3. 8-Wire Guarded Force-Sense Measurements
Note that although the positive and negative circuits are
identical, they are not redundant. Both are always used,
even when one side of the load is grounded, because
maintaining a precision output voltage requires losses in
the ground leads to be corrected by a force-sense
amplifier. If more than one power supply and load are
operated together, and they have a common connection, this requirement becomes even more critical.
Separate 8-wire connections prevent current changes in
one load from changing voltage in the other load.
12-Wire Measurements
Figure 4 shows a 12-wire circuit, which is an elaboration of the 8-wire system using separate driven guards
for the force and sense wires. Four sets of triaxial
cables and connectors are used. The extra wires are
used for two reasons: 1) They provide better shielding
by having separate chassis grounds on each cable,
rather than separate ground wires external to the signal
cables; 2) In test equipment, where connection
changes are frequent, it is very convenient to use four
triax connectors or two quadrax (dual triax) connectors
for each load.
In addition, this method is slightly better for power supplies or measurements that switch between constant
voltage and constant current, since separate driven
guards reduce circuit capacitance. Also, when troubleshooting, it is convenient to be able to interchange
force and sense leads.
______________________________________________________________________________________
17
MAX4554/MAX4555/MAX4556
Force-Sense Switches
12-WIRE PRECISION SOURCE-MONITOR
+ FORCE-SENSE AMPLIFIER
V+
CURRENT SENSE
V
TRIAX CABLE
+FORCE
+GUARD
GROUND
VV+
LEAKAGE CURRENT
VTRIAX CABLE
+SENSE
+GUARD
GROUND
+ FORCE-GUARD AMPLIFIER
V+
+SENSE
GUARD AMPLIFIER
V-
LEAKAGE CURRENT
V+
VOLTAGE SOURCE
LOAD
(OPTIONAL GROUND)
VLEAKAGE CURRENT
V+
- SENSE-GUARD AMPLIFIER
V- FORCE-GUARD AMPLIFIER
V+
GROUND
- GUARD
-SENSE
TRIAX CABLE
LEAKAGE CURRENT
V+
V-
GROUND
- GUARD
- FORCE
+V
V
CURRENT SENSE
V-
- FORCE-SENSE AMPLIFIER
TRIAX CABLE
TRIAX CABLE/CONNECTOR
CENTER WIRE (FORCE/SENSE)
INNER SHEILD (GUARD)
OUTER SHEILD (GROUND)
Figure 4. 12-Wire Guarded Force-Sense Measurements
18
______________________________________________________________________________________
Force-Sense Switches
When a precision source or measurement must be connected sequentially to several circuits, all sense and
guard connections must be switched simultaneously,
and at least one of the force connections must be
switched. To maintain safety and low noise levels, the
ground (or chassis) connection should never be disconnected.
The force circuit switch should have low-resistance,
high-current capability, but the sense and guard circuit
switches require only moderate resistance and current
capability. The sense and guard switches should have
lower leakage than the lowest measured current.
CMOS switches should also be operated from power
supplies higher than the highest circuit voltage to be
switched.
_______________Detailed Description
The MAX4554/MAX4555/MAX4556 are CMOS analog
ICs configured as force-sense switches. Each part contains low-resistance switches for forcing current, and
higher resistance switches for sensing a voltage or driving guard wires. Analog signals on the force, sense, or
guard circuits can range from V- to V+. Each switch is
completely symmetrical and signals are bidirectional;
any switch terminal can be an input or output. The
switches’ open or closed states are controlled by
TTL/CMOS-compatible input (IN_) pins.
The MAX4555 and MAX4556 are characterized and
guaranteed only with ±15V supplies, but they can operate from a single supply up to +44V or non-symmetrical
supplies with a voltage totaling less than +44V. The
MAX4554 is fully characterized for operation from ±15V
supplies, and it is also fully specified for operation with
+20V and -10V supplies. A separate logic supply pin,
VL, allows operation with +5V or +3V logic, even with
unusual V+ values. The negative supply pin, V-, must
be connected to GND for single-supply operation.
The MAX4554 contains two force switches, two sense
switches, and two guard switches configured as two
3PST switches. The two switches operate independently of one another, but they have a common connection,
allowing one source to be connected simultaneously to
two loads, or two sources to be connected to one load.
An enable pin, EN, turns all switches off when driven to
logic high. The MAX4554 is also fully specified for operation with +20V and -10V supplies. The MAX4555 contains four independent SPDT, NC switches; two are
force switches and two are sense switches. The
MAX4556 contains three independent SPDT switches;
one is a force switch and two are sense switches.
Switch Resistances
Each IC contains four internal switches: four low-current
sense-guard switches and two high-current force
switches. Each sense-guard switch has an on-resistance of approximately 60Ω, while each force switch
has an on-resistance of approximately 6Ω. The
MAX4555’s two low-current sense-guard switches are
connected in parallel to produce lower on-resistance
and allow higher current.
Power-Supply Considerations
Overview
The MAX4554/MAX4555/MAX4556’s construction is typical of most CMOS analog switches. They have four supply pins: V+, V-, VL, and GND. V+ and V- are used to
drive the internal CMOS switches and set the analog voltage limits on any switch. Reverse ESD protection diodes
are internally connected between each analog and digital
signal pin and both V+ and V-. If any signal exceeds V+
or V-, one of these diodes will conduct. During normal
operation these reverse-biased ESD diodes leak, forming
the only current drawn from the signal paths.
Virtually all the analog leakage current comes through
the ESD diodes to V+ or V-. Although the ESD diodes on
a given signal pin are identical, and therefore fairly well
balanced, they are reverse biased differently. Each is
biased by either V+ or V- and the analog signal. This
means their leakages vary as the signal varies. The difference in the two diode leakages from the signal path
to the V+ and V- pins constitutes the analog-signal-path
leakage current. All analog leakage current flows to the
supply terminals, not to the other switch terminal. This
explains how both sides of a given switch can show
leakage currents of either the same or opposite polarity.
There is no connection between the analog signal
paths and GND or VL. The analog signal paths consist
of an N-channel and P-channel MOSFET with their
sources and drains paralleled, and their gates driven
out of phase to V+ and V- by the logic-level translators.
VL and GND power the internal logic and logic-level
translator and set the input logic threshold. The logiclevel translator converts the logic levels to switched V+
and V- signals for driving the gates of the analog
switches. This drive signal is the only connection
between GND and the analog supplies. V+ and V- have
ESD-protection diodes to GND. The logic-level inputs
(IN_, and EN) have ESD protection to V+ and V-, but
not to GND; therefore, the logic signal can go below
GND (as low as V-) when bipolar supplies are used.
The logic-level threshold VIN is CMOS and TTL compatible when VL is between 4.5V and 36V (see Typical
Operating Characteristics).
______________________________________________________________________________________
19
MAX4554/MAX4555/MAX4556
Switching Guarded and
Force-Sense Signals
MAX4554/MAX4555/MAX4556
Force-Sense Switches
Increasing V- has no effect on the logic-level thresholds, but it does increase the drive to the internal Pchannel switches, reducing the overall switch
on-resistance. V- also sets the negative limit of the analog signal voltage.
Bipolar-Supply Operation
The MAX4554/MAX4555/MAX4556 operate with bipolar
supplies between ±4.5V and ±18V. However, since all
factory characterization is done with ±15V supplies
(and +20V, -10V for MAX4554), operation at other supplies is not guaranteed. The V+ and V- supplies need
not be symmetrical, but their sum cannot exceed the
absolute maximum rating of 44V (see Absolute Maximum Ratings). VL must not exceed V+.
Single-Supply Operation
The MAX4554/MAX4555/MAX4556 operate from a single supply between +4.5V and +44V when V- is con-
nected to GND. All of the bipolar precautions must be
observed.
__________Applications Information
Switching 4-Wire
Force-Sense Circuits
Figure 5 shows how to switch a single voltage or current source between two loads using two MAX4555s. A
single CMOS inverter ensures that only one switch is on
at a time. On each MAX4555, switches 2 and 3 are the
high-current switches, so they should be used for force
circuits. By interchanging loads and sources, the circuit
can be reversed to switch two sources to a single load.
Additional MAX4555s and loads or sources can be
added to expand the circuit, but additional IN_ address
decoding must be incorporated.
V+
FORCE
COM2
SENSE
COM1
V-
VL
MAX4555
NC2
NC1
FEEDBACK
V
SENSE
FORCE
LOAD1
COM4
NC4
COM3
NC3
IN2
VOLTAGE/CURRENT SOURCE
IN1
LOGIC
IN
LOAD
0
1
CMOS INVERTER
IN
GND
IN4
IN3
2
1
V+
COM2
V-
VL
MAX4555
NC2
COM1
NC1
COM4
NC4
COM3
NC3
LOAD2
IN2
IN1
GND
IN4
IN3
Figure 5. Using the MAX4555 to Switch 4-Wire Force-Sense Circuits from One Source to Two Loads
20
______________________________________________________________________________________
Force-Sense Switches
would be close to (but not exactly equal to) the desired
value; this would not cause any damage to the device.
Switching 3-Wire Guarded Circuits
Figure 7 shows how to switch a single guarded voltage
or current source between two loads using the
MAX4554 or MAX4556. By interchanging loads and
sources, the circuits can be reversed to switch two
sources to a single load. If the loads have a common
connection, the switch to that node can be eliminated.
Note that these circuits use sense (high-resistance)
switches to switch the common wire. This is permissible
only if the load currents are very low. If the currents are
high, the common connection should not be switched
unless another force switch is substituted.
V+
V-
VL
MAX4556
FORCE
COM1
SENSE
COM2
SENSE
COM3
NC1
NO1
NC2
NO2
FEEDBACK
V
NC3
LOAD1
LOAD2
LOAD1
NO3
FORCE
IN1
VOLTAGE/CURRENT SOURCE
GND
IN2
LOGIC
IN
LOAD
0
1
1
2
IN
IN3
V+
V-
VL
MAX4554
NOF1
FORCE
FCOM
NOF2
SENSE
SCOM
NOS1
NOS2
SENSE
GCOM
FEEDBACK
V
LOAD2
NOG2
FORCE
NOG1
IN1
VOLTAGE/CURRENT SOURCE
LOGIC
IN
LOAD
0
1
1
2
GND
EN
IN2
IN
CMOS INVERTER
Figure 6. Using the MAX4554/MAX4556 to Switch 4-Wire Force-Sense Circuits from One Source to Two Loads
______________________________________________________________________________________
21
MAX4554/MAX4555/MAX4556
Figure 6 shows how to switch a single voltage or current source between two loads using the MAX4554 or
MAX4556. By interchanging loads and sources, the circuits can be reversed so that they switch two sources
to a single load. The two loads are electrically connected together at one point, but may be physically separated. This means that one force wire does not need to
be switched, but the corresponding sense wires do.
The MAX4554 has independent 3PST, NO switches driven out of phase by an external CMOS inverter, so that
one switch is on while the other is off. If both switches
were turned on at the same time, both loads would be
connected, and the resulting voltage at either load
MAX4554/MAX4555/MAX4556
Force-Sense Switches
V+
V-
VL
MAX4556
NC1
NO1
NC2
NO2
COM1
GUARD AMPLIFIER
COM2
NC3
COM3
LOAD2
LOAD1
LOAD2
LOAD1
NO3
IN1
GND
IN2
VOLTAGE OR
CURRENT SOURCE
IN
0
1
IN
IN3
LOGIC
LOAD
1
2
V+
V-
MAX4554
GUARD AMPLIFIER
VL
NOG1
GCOM
NOG2
FCOM
NOF1
NOF2
SCOM
NOS1
NOS2
IN1
GND
EN
VOLTAGE OR
CURRENT SOURCE
IN
0
1
LOGIC
LOAD
1
2
IN
IN2
CMOS INVERTER
Figure 7. Using the MAX4554/MAX4556 to Switch 3-Wire Guarded Circuits from One Source to Two Loads
22
______________________________________________________________________________________
Force-Sense Switches
Switching 8-Wire Guarded Circuits
Figure 9 shows how to switch a single 8-wire guarded
force-sense voltage or current source between two
loads using two MAX4556s or two MAX4554s. By interchanging loads and sources, the circuits can be
reversed so that they switch two sources to a single
load. The two loads are shown isolated from each
another, but if they have a common connection then the
circuit must remain as shown in order to maintain accurate load voltage.
High-Frequency Performance
Although switching speed is restricted, once a switch is
in a steady state it exhibits good RF performance. In
50Ω systems, signal response is reasonably flat up to
50MHz (see Typical Operating Characteristics). The
force switches have lower on-resistance, so their insertion loss in 50Ω systems is lower. Above 20MHz, the
on-response has several minor peaks that are highly
layout dependent. The problem with high-frequency
operation is not turning the switches on, but turning
them off. The off-state switches act like capacitors and
pass higher frequencies with less attenuation. At
10MHz, off-isolation between input or output signals is
approximately -30dB in 50Ω systems, degrading
(approximately 20dB per decade) as frequency
increases. Higher circuit impedances also degrade offisolation.
V+
COM1
GUARD AMPLIFIER
COM2
V-
VL
MAX4555
NC1
NC2
LOAD2
COM3
COM4
IN1
IN2
NC3
NC4
GND
LOAD1
IN3
VOLTAGE OR
CURRENT SOURCE
IN
0
1
IN
IN4
LOGIC
LOAD
2
1
Figure 8. Using the MAX4555 to Switch 3-Wire Guarded Circuits from One Source to Two Loads
______________________________________________________________________________________
23
MAX4554/MAX4555/MAX4556
Figure 8 shows how to switch a single guarded voltage
or current source between two grounded loads using a
MAX4555. By interchanging loads and sources, the circuits can be reversed so that two sources are switched
to a single load.
MAX4554/MAX4555/MAX4556
Force-Sense Switches
FORCE-SENSE AMPLIFIER
V+
V+
V-
VL
CURRENT SENSE
NC1
NC2
NC3
NO1
NO2
NO3
GND
MAX4556
V-
V+
V
VL
VCOM1
COM2
COM3
V+
MAX4556
NC1
NO1
COM1
IN1
NC2
COM2
NO2
NC3
COM3
NO3
GUARD AMPLIFIER
V-
IN2
V+
IN3
INA
V+
LEAKAGE
CURRENT
V-
LEAKAGE
CURRENT
VVL
VOLTAGE SOURCE
IN1
TWINAX CABLE
+FORCE
+SENSE
+DRIVEN GUARD
V+
LOAD 1
LOAD 2
IN2
GUARD AMPLIFIER
GND
IN
IN3
MAX4556
NC1
NC2
NC3
NO1
NO2
NO3
GND
COM1
COM2
COM3
VV+
V
CURRENT SENSE
VFORCE-SENSE
AMPLIFIER
V+
LOGIC
IN A,B LOAD
0
1
1
2
IN1
IN2
IN3
INA
V+
V-
VL
CURRENT SENSE
MAX4554
V
VV+
V-
VL
COMF
COMS
COMG
V+
MAX4554
NOG1
COMG
GUARD AMPLIFIER
NOG2
NOF1
COMF
NOF2
V-
IN
LEAKAGE
CURRENT
V-
LEAKAGE
CURRENT
V+
GUARD AMPLIFIER
EN
GND
IN2
CMOS INVERTER
CURRENT SENSE
V-
LOGIC
IN A,B LOAD
0
2
1
1
LOAD 1
VL
IN1
NOG1
NOS1
NOF1
NOG2
NOS2
NOF2
EN
GND
IN2
-DRIVEN GUARD
-SENSE
-FORCE
TWINAX CABLE
INB
Figure 9. Switching 8-Wire Guarded Force-Sense Measurements from One Precision Source-Monitor to Two Loads
24
LOAD 2
MAX4554
V
FORCE-SENSE
AMPLIFIER
V-
COMG
COMS
COMF
VV+
LOGIC
IN A,B LOAD
0
2
1
1
IN2
V+
NOS1
NOS2
IN1
TWINAX CABLE
+FORCE
+SENSE
+DRIVEN GUARD
INB
VOLTAGE SOURCE
V+
COMS
IN1
NC1
NC2
NC3
NO1
NO2
NO3
EN
GND
-DRIVEN GUARD
-SENSE
-FORCE
TWINAX CABLE
______________________________________________________________________________________
Force-Sense Switches
V+
VL
V+
VL
VL
NO_ OR NC_
V+
50%
VIN_
0V
VIN_
MAX4554
MAX4555
MAX4556 COM_
IN_
50Ω
GND
EN
V-
V+
VOUT
300Ω
90%
35pF
VOUT
V-
90%
0V
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
tOFF
tON
Figure 10. Address Transition Time
VL
V+
VL
V+
VL
VL
NO_
ADDRESS
SELECT
V+
50%
VEN
0V
IN_
MAX4554
COM_
VEN
GND
EN
V-
50Ω
V+
VOUT
300Ω
90%
35pF
VOUT
V-
90%
0V
tTRANS
tTRANS
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 11. Enable Transition Time
VIN_
IN_
50Ω
V+
VL
V+
VL
VIN_
NO_
VNO_, NC_
80%
VOUT
COM_
V-
50%
0V
V+
NC_
MAX4556
GND
t R < 5ns
t F < 5ns
V+
VOUT
300Ω
V-
35pF
0V
tOPEN
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 12. Break-Before-Make Interval
______________________________________________________________________________________
25
MAX4554/MAX4555/MAX4556
______________________________________________Test Circuits/Timing Diagrams
MAX4554/MAX4555/MAX4556
Force-Sense Switches
_________________________________Test Circuits/Timing Diagrams (continued)
VIN_
IN_
V+
VL
V+
VL
VL
VIN
NO_ OR NC_
50Ω
0V
MAX4554
MAX4555
MAX4556 COM_
GND
EN
VOUT
V-
∆VOUT
VOUT
CL
1000pF
∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
V-
Q = ∆VOUT x CL
V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 13. Charge Injection
VL
V+
VL
MAX4554
MAX4555
MAX4556
VL
ADDRESS
SELECT
V+
NO_
NC_
1MHz
CAPACITANCE
ANALYZER
COM_
IN_
GND
EN
VV-
Figure 14. COM_, NO_, NC_ Capacitance
V+ 10nF
VL 10nF
V+
VL
COM_
NETWORK
ANALYZER
VIN
50Ω
MAX4554
MAX4555
MAX4556
VL
ADDRESS
SELECT
IN_
EN
GND
VOUT
VOUT
VIN
ON LOSS = 20 log
VOUT
VIN
CROSSTALK = 20 log
VOUT
VIN
50Ω
MEAS.
REF
NO_, NC_
V50Ω
OFF ISOLATION = 20 log
50Ω
10nF
VMEASUREMENTS ARE STANDARDIZED AGAINST SHORT AT SOCKET TERMINALS. OFF ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINALS.
ON LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINALS. CROSSTALK IS MEASURED BETWEEN COM_ TERMINALS WITH ALL SWITCHES ON.
SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. V- IS CONNECTED TO GND (0V) FOR SINGLE-SUPPLY OPERATION.
Figure 15. Frequency Response, Off-Isolation, and Crosstalk
26
______________________________________________________________________________________
Force-Sense Switches
TOP VIEW
MAX4555
MAX4556
16 IN2
IN1 1
15 COM2*
COM1 2
14 NC2*
NC1 3
NO3 1
16 COM3
N02 2
15 COM2
NO1* 3
14 COM1*
V- 4
13 V+
V- 4
13 V+
GND 5
12 VL
GND 5
12 VL
NC4 6
11 NC3*
NC1* 6
11 IN1
10 COM3
NC2 7
10 IN2
9 IN3
NC3 8
9 IN3
COM4 7
IN4 8
DIP/SO
DIP/SO
MAX4555
IN_
SWITCH
MAX4556
IN_
COM_
0
1
ON
OFF
0
1
NC_
NO_
SWITCH POSITIONS SHOWN WITH IN_ = LOW
*INDICATES HIGH-CURRENT, LOW-RESISTANCE FORCE SWITCH
Ordering Information (continued)
PART
TEMP. RANGE
PIN-PACKAGE
MAX4555CPE
0°C to +70°C
16 Plastic DIP
MAX4555CSE
0°C to +70°C
16 Narrow SO
MAX4555C/D
MAX4555EPE
MAX4555ESE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
Dice*
16 Plastic DIP
16 Narrow SO
MAX4556CPE
0°C to +70°C
16 Plastic DIP
MAX4556CSE
0°C to +70°C
16 Narrow SO
MAX4556C/D
MAX4556EPE
MAX4556ESE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
Dice*
16 Plastic DIP
16 Narrow SO
*Contact factory for availability.
______________________________________________________________________________________
27
MAX4554/MAX4555/MAX4556
__________Pin Configurations/Functional Diagrams/Truth Tables (continued)
MAX4554/MAX4555/MAX4556
Force-Sense Switches
_________________________________________________________________________Chip Topographies
MAX4554
NOG1
MAX4555
IN1
COMG
NOS1
COM1
COMS
NOF1
IN2
COM2
NC1
NC2
COMF
V+
V-
0.190"
(4.83mm)
GND
V+
V-
0.190"
(4.83mm)
GND
VL
VL
NC3
IN1
COM3
NC4
IN2
NOF2
COM4
NOS2
NOG2
IN4
EN
0.086"
(2.18mm)
IN3
0.086"
(2.18mm)
MAX4556
NO3
COM3
NO2
COM2
NO1
COM1
V+
V-
0.190"
(4.83mm)
GND
VL
IN1
IN2
NC1
NC2
NC3
IN3
0.086"
(2.18mm)
TRANSISTOR COUNT: 197
SUBSTRATE IS INTERNALLY CONNECTED TO V+
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.

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