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零件编号 | MAX4577 | ||
描述 | CMOS Analog Switches | ||
制造商 | Maxim Integrated | ||
LOGO | |||
1 Page
19-1762; Rev 0; 7/00
±15kV ESD-Protected, Low-Voltage, Dual, SPST,
CMOS Analog Switches
General Description
The MAX4575/MAX4576/MAX4577 are low-voltage,
high electrostatic discharge (ESD)-protected, dual sin-
gle-pole/single-throw (SPST) analog switches. The nor-
mally closed (NO) and normally open (NC) pins are
protected against ±15kV ESD without latchup or dam-
age. Each switch can handle Rail-to-Rail® analog sig-
nals. Off-leakage current is 0.5nA at +25°C. These
analog switches are suitable for low-distortion audio
applications and are the preferred solution over
mechanical relays in automated test equipment or
applications where current switching is required. They
have low power requirements (0.5µW), require less
board space, and are more reliable than mechanical
relays. Each device is controlled by TTL/CMOS input
voltage levels and is bilateral.
These switches feature guaranteed operation from a
single supply of +2V to +12V, making them ideal for
use in battery-powered applications. On-resistance is
70Ω (max), matched between switches to 0.5Ω (typ)
and flat (2Ω typ) over the specified signal range.
The MAX4575 has two NO switches, the MAX4576 has
two NC switches, and the MAX4577 has one NO and
one NC switch. These devices are available in 8-pin
µMAX and SO packages.
Applications
Battery-Powered Systems
Audio and Video Signal Routing
Low-Voltage Data-Acquisition Systems
Sample-and-Hold Circuits
Communications Circuits
Relay Replacement
PART
MAX4575 EUA
MAX4575ESA
MAX4576 EUA
MAX4576ESA
MAX4577 EUA
MAX4577ESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 µMAX
8 SO
8 µMAX
8 SO
8 µMAX
8 SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
____________________________Features
o ESD-Protected NO/NC Pins
±15kV (Human Body Model)
±15kV (IEC 1000-4-2 Air-Gap Discharge)
±8kV (IEC 1000-4-2 Contact Discharge)
o Pin Compatible with MAX4541/MAX4542/MAX4543
o Guaranteed On-Resistance
70Ω (max) at +5V
150Ω (max) at +3V
o On-Resistance Flatness
2Ω (typ) at +5V
6Ω (typ) at +3V
o On-Resistance Matching
0.5Ω (typ) at +5V
0.6Ω (typ) at +3V
o Guaranteed 0.5nA Leakage Current at TA = +25°C
o +2V to +12V Single-Supply Voltage
o TTL/CMOS-Logic Compatible
o Low Distortion: 0.015%
o -3dB Bandwidth >300MHz
o Rail-to-Rail Signal Range
Pin Configurations/
Functional Diagrams/Truth Tables
TOP VIEW
MAX4575
NO1 1
COM1 2
IN2 3
GND 4
8 V+
7 IN1
6 COM2
5 NO2
S O / µM A X
MAX4575
LOGIC
SWITCH
0 OFF
1 ON
SWITCHES SHOWN FOR LOGIC "0" INPUT
Pin Configurations/Functional Diagrams/Truth Tables
continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
±15kV ESD-Protected, Low-Voltage, Dual, SPST,
CMOS Analog Switches
MAX4575
MAX4576
MAX4577
RGEN COM
VGEN
GND
V+
V+
NO_/NC_
IN
Figure 3. Charge Injection
VIN
VOUT
CL
VOUT
OFF
IN
∆VOUT
ON
Q = (∆VOUT)(CL)
OFF
CAPACITANCE
METER
f = 1MHz
V+
10nF
V+
COM
NO_/NC_
GND
MAX4575
MAX4576
MAX4577
IN VIL OR
VIH
SIGNAL
GENERATOR 0dBm
0 OR 2.4V
ANALYZER
RL
10nF V+
V+
COM1
IN1
NO2/NC2
GND
MAX4575
MAX4576
MAX4577
NO1/NC1
50Ω
IN2
COM2
0 OR
2.4V
NC
Figure 4. Channel Off/On-Capacitance
Figure 5. Crosstalk
and bypass the surge safely to ground. This method is
superior to using diode clamps to the supplies
because, unless the supplies are very carefully decou-
pled through low-ESR capacitors, the ESD current
through the diode clamp could cause a significant
spike in the supplies. This may damage or compromise
the reliability of any other chip powered by those same
supplies.
There are diodes from NC/NO to the supplies in addi-
tion to the SCRs. There is a resistance in series with
each of these diodes to limit the current into the sup-
plies during an ESD strike. The diodes protect these
terminals from overvoltages that are not a result of ESD
strikes. These diodes also protect the device from
improper power-supply sequencing.
Once the SCR turns on because of an ESD strike, it
continues to be on until the current through it falls
below its “holding current.” The holding current is typi-
cally 110mA in the positive direction (current flowing
into the NC/NO terminal) at room temperature (see SCR
Holding Current vs. Temperature in the Typical
Operating Characteristics). Design the system so that
any sources connected to NC/NO are current limited to
a value below the holding current to ensure the SCR
8 _______________________________________________________________________________________
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页数 | 12 页 | ||
下载 | [ MAX4577.PDF 数据手册 ] |
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