General Description

The MAX4644 is a single-pole/double-throw (SPDT)switch that operates from a single supply ranging from +1.8V to +5.5V. It provides low 4?on-resistance (R ON )as well as 1?R ON flatness over the entire analog signal range. The MAX4644 offers fast switching times of less than 20ns while ensuring break-before-make operation.It typically consumes only 0.01μW of quiescent power,making it suitable for use in low-power, portable appli-cations.

The MAX4644’s features include low leakage currents over the entire temperature range, TTL/CMOS-compati-ble digital logic, and excellent AC characteristics. I t is packaged in either a small 8-pin μMAX or a tiny 6-pin SOT23.

________________________Applications

Battery-Operated Equipment Audio and Video Signal Routing Low-Voltage Data-Acquisition Systems Sample-and-Hold Circuits Communications Circuits

Features

o +1.8V to +5.5V Single-Supply Operation o Rail-to-Rail ?Analog Signal Range o Guaranteed R ON

4?max (+5V supply)8?max (+3V supply)o +1.8V Operation

R ON 30?typ Over Temperature t ON 18ns typ, t OFF 12ns typ

o Guaranteed R ON Flatness: 0.75?typ (+5V supply)o Guaranteed R ON Match Between Channels: 0.1?typ (+5V supply)

o Low Leakage (<0.35nA) Over Entire Temperature Range

o Excellent AC Characteristics

Low Crosstalk: -82dB at 1MHz High Off-Isolation: -80dB at 1MHz 0.018% Total Harmonic Distortion o Low Power Consumption: < 0.01μW

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

________________________________________________________________Maxim Integrated Products 1

Pin Configurations/Functional Diagrams/Truth Table

19-1657; Rev 0; 3/00

For free samples and the latest literature, visit http://www.wendangku.net/doc/9c4f389bdaef5ef7ba0d3cc1.html or phone 1-800-998-8800.For small orders, phone 1-800-835-8769.

Ordering Information

Rail-to-Rail is a trademark of Nippon Motorola, Ltd.

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch 2_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS —Single +5V Supply

(V+ = +4.5V to +5.5V, V INH = 2.4V, V INL = 0.8V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°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.

All Voltages Referenced to GND

V+.............................................................................-0.3V to +6V IN, COM, NO, NC (Note 1)...........................-0.3V to (V+ + 0.3V)Continuous Current (any terminal)....................................±20mA Continuous Current (NO, NC, and COM).........................±50mA Peak Current (NO, NC, and COM, pulsed at 1ms,

10% duty cycle).........................................................±100mA

Continuous Power Dissipation (T A = +70°C)

6-Pin SOT23 (derate 8.70mW/°C above +70°C)........696mW 8-Pin μMAX (derate 4.5mW/°C above +70°C)...........362mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature......................................................+150°C Storage Temperature Range.............................-65°C to +150°C Lead Temperature (soldering, 10s)................................+300°C

Note 1:Signals on NO, NC, COM, or IN exceeding V+ or GND are clamped by internal diodes. Limit forward-diode current to maximum

current rating.

ABSOLUTE MAXIMUM RATINGS

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

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ELECTRICAL CHARACTERISTICS —Single +5V Supply (continued)

(V+ = +4.5V to +5.5V, V INH = 2.4V, V INL = 0.8V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)

ELECTRICAL CHARACTERISTICS —Single +3V Supply

(V+ = +2.7V to +3.3V, V INH = 2.0V, V INL = 0.4V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch 4_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS —Single +3V Supply (continued)

(V+ = +2.7V to +3.3V, V INH = 2.0V, V INL = 0.4V, T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C.)

Note 2:?R ON = R ON(MAX)- R ON(MIN).

Note 3:R ON flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the

specified analog signal range.

Note 4:Guaranteed by design.

Note 5:On-Leakage performed with voltage applied to COM, with NO and NC left floating.

Note 6:Off-Isolation = 20log 10(V O / V I ), where V O is V COM and V I is either V NC or V NO from the network analyzer.Note 7:Crosstalk is measured between the two switches.

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

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1401201008060402000

21345

CHARGE INJECTION vs. V COM

V COM (V)

C H A R G E I N J E C T I O N (p C )

20

1510

5

00

21

3

4

5

ON-RESISTANCE vs. V COM

V COM (V)

R O N (?)

R O N (?)

5

4

3

2

1-40

10

-15

35

60

85

ON-RESISTANCE vs. TEMPERATURE

TEMPERATURE (°C)

1-40

85

35

60

-15

10

ON-/OFF-LEAKAGE CURRENT

vs. TEMPERATURE

1000

10

100

TEMPERATURE (°C)

L E A K A G E (p A

)

04020

8060120100140SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

S U P P L Y C U R R E N T (n A )

1.8

2.8

3.8

4.8

5.8300250200

150100500

-4010-1535

6085

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

S U P P L Y C U R R E N T (n A )

2.01.5

1.0

0.5

01.8

3.4

2.6

4.2

5.0

5.8

LOGIC THRESHOLD vs. SUPPLY VOLTAGE

M A X 4644-07

SUPPLY VOLTAGE (V)

L O G I C T H R E S H O L D (V )

03

9

6

1215SWITCHING TIMES vs. SUPPLY VOLTAGE

8

SUPPLY VOLTAGE (V)

S W I T C H I N G T I M E S (n s )

2

4

3

5

02

6

4

8

10

SWITCHING TIMES vs. TEMPERATURE

TEMPERATURE (°C)

S W I T C H I N G T I M E S (n s )

-40

35

60

10

-15

85

Typical Operating Characteristics

(V+ = +5V or +3V, V INH = V+, V INL = GND, T A = +25°C, unless otherwise noted.)

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch 6_______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = +5V or +3V, V INH = V+, V INL = GND, T A = +25°C, unless otherwise noted.)

Pin Description

00.01

0.1

1

10

100

1000

-10-40-50-30-20-60-70-80-90FREQUENCY RESPONSE

FREQUENCY (MHz)

(d B /d i v )

0.05

0.011

100.1100

TOTAL HARMONIC DISTORTION

vs. FREQUENCY

FREQUENCY (kHz)

T H D (%)

00.010.02

0.030.04

Note:The switches are bidirectional, which means that a signal can be passed through either side of the on switch. However,

the typical off-capacitances differ as shown in the Electrical Characteristics.

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

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Applications Information

The MAX4644 operates from a single supply ranging from +1.8V to +5.5V. The device is guaranteed to be functional over that supply range, but TTL/CMOS com-patibility is only valid for operation using a +5V supply.All voltage levels are referenced to GND. Positive and negative DC analog inputs or AC signals can be accommodated by shifting V+ and GND.

ESD-protection diodes are internally connected between each analog-signal pin and both V+ and GND.One of these diodes conducts if any analog signal exceeds V+ or GND (Figure 1). Virtually all of the ana-log leakage current comes from the ESD diodes to V+or GND. 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 GND and the analog signal. This means their leakages will vary as the signal varies. The difference in the two diode leakages to the V+ and GND pins consti-tutes the analog-signal-path leakage current. All analog leakage current flows between each pin and one of the supply terminals, not to the other switch terminal. This is why both sides of a given switch can show leakage cur-rents of the same or opposite polarity.

There is no normal current path between the analog-signal paths and V+ or GND. V+ and GND also power the internal logic and logic-level translators. The logic-level translators convert the logic level into switched V+and GND signals to drive the analog signal gates.

Figure 1. Overvoltage Protection Using External Blocking Diodes

Chip Information

TRANSISTOR COUNT: 105

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch 8_______________________________________________________________________________________

Figure 2. Switching Times

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

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9

Figure 5. NO, NC, and COM Capacitance

Figure 3. Off-Isolation and On-Loss

Figure 4. Charge Injection

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch 10______________________________________________________________________________________

Package Information

MAX4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch

______________________________________________________________________________________11

Package Information (continued)

M A X 4644

High-Speed, Low-Voltage, 4?, SPDT CMOS Analog Switch Ma xim ca nnot a ssume responsibility for use of a ny circuitry other tha n circuitry entirely embodied in a Ma xim product. No circuit pa tent licenses a re implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

12____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600?2000 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

NOTES