Datasheet

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General Description

The MAX4645/MAX4646 single-pole, single-throw (SPST)

analog switches feature a 2.5Ω typical on-resistance

) from a +5V supply. R

is flat (0.4Ω max) over the

specified signal range. Each switch can handle Rail-to-

Rail

analog signals. Off-leakage current is 0.25nA max at

+25°C. These analog switches are ideal in low-distortion

applications and are the preferred solution over mechani-

cal relays in automated test equipment or applications

where current switching is required. They have low power

requirements, require less board space, and are more

reliable than mechanical relays.

These switches operate from a +1.8V to +5V single sup-

ply, making them ideal for use in battery-powered applica-

tions. The MAX4645/MAX4646 have fast switching speeds

of 12ns turn-on time (t

) and 8ns turn-off time (t

OFF

The MAX4645 is a normally open (NO) switch, and the

MAX4646 is a normally closed (NC) switch. Both are

available in 5-pin SOT23, 6-pin SOT23, and 8-pin µMAX

packages.

________________________Applications

Battery-Powered Systems

Audio and Video Signal Routing

Low-Voltage Data-Acquisition Systems

Sample-and-Hold Circuits

Communications Circuits

Relay Replacement

____________________________Features

♦ +1.8V to +5V Single-Supply Operation

♦ Guaranteed R

2.5Ω max (5V supply)

3.5Ω max (3V supply)

♦ 1.8V Operation

30Ω typ Over Temperature

40ns typ, t

OFF

20ns typ

♦ Low R

Flatness: 0.4Ω max

♦ Guaranteed Low Leakage Currents

±0.25nA at +25°C

♦ Rail-to-Rail Output Capability

♦ TTL/CMOS-Logic Compatible

♦ -75dB Off-Isolation at 1MHz

♦ Low Distortion: 0.014% typ

MAX4645/MAX4646

Fast, Low-Voltage, 2.5Ω, SPST,

CMOS Analog Switches

________________________________________________________________ Maxim Integrated Products 1

19-1653; Rev 2; 2/04

Ordering Information

Pin Configurations/Functional Diagrams/Truth Tables

µMAX/SO/DIP

PIN 5

XYZA

123

NOTE: SOT23-5 PACKAGE

HAS LETTERING NEAREST PIN 5.

TOP VIEW

GND

V+

COM

MAX4645

SOT23-5

INPUT

SWITCH STATE

MAX4645

OFF

MAX4646

OFF

SWITCHES SHOWN FOR LOGIC 0 INPUT.

µMAX/SO/DIP

GND

V+

COM

MAX4646

SOT23-5

MAX4645EUT-T -40°C to +85°C

PART TEMP RANGE

MAX4645EUK-T

-40°C to +85°C

MAX4646EUK-T

-40°C to +85°C

MAX4646EUT-T -40°C to +85°C

MAX4646EUA -40°C to +85°C

MAX4645EUA -40°C to +85°C

8 µMAX

6 SOT23-6

5 SOT23-5

8 µMAX

6 SOT23-6

5 SOT23-5

PIN-

PACKAGE

—

AAHM

ADOC

—

AAHL

ADOB

TOP

MARK

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

Pin Configurations/Functional Diagrams/

Truth Tables continued at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Summary of content (11 pages)

PAGE 1
9-1653; Rev 2; 2/04 Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches The MAX4645/MAX4646 single-pole, single-throw (SPST) analog switches feature a 2.5Ω typical on-resistance (RON) from a +5V supply. RON is flat (0.4Ω max) over the specified signal range. Each switch can handle Rail-toRail® analog signals. Off-leakage current is 0.25nA max at +25°C.
PAGE 2
MAX4645/MAX4646 Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches ABSOLUTE MAXIMUM RATINGS V+, VIN to GND ...........................................................-0.3 to +6V COM, NO, NC to GND (Note 1)....................-0.3V to (V+ + 0.3V) Continuous Current (any terminal)....................................±50mA Peak Current COM, NO, NC (pulsed at 1ms 10% duty cycle)................................±100mA Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23 (derate 7.1mW/°C above+70°C)............
PAGE 3
Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches (V+ = 4.5V to 5.5V, VIH = 2.4V, VIL = 0.8V, TA = TMIN to TMAX, unless otherwise specified.) (Notes 2, 3) PARAMETER Charge Injection SYMBOL Q CONDITIONS MIN TYP MAX UNITS VGEN = 2V, CL = 1.
PAGE 4
MAX4645/MAX4646 Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches ELECTRICAL CHARACTERISTICS—Single +3V Supply (continued) (V+ = 2.7V to 3.3V, VIH = 2.0V, VIL = 0.4V, TA = TMIN to TMAX, unless otherwise specified.) (Notes 2, 3) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUT Input Logic High VIH Input Logic Low VIL Logic Input Current IIN 2.0 -1 VIN_ = 0.4V or 2.0V V 0.4 V 0.
PAGE 5
Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches ON-RESISTANCE vs. VCOM AND SUPPLY VOLTAGE ON-RESISTANCE vs. VCOM AND TEMPERATURE 2.0 TA = +85°C RON (Ω) 6 TA = +25°C 1.0 V+ = 2.5V 4 1.5 TA = -40°C V+ = 3V OFF-LEAKAGE V+ = 4.5V V+ = 5V 0 1 2 3 4 5 V+ = 5.5V 0.01 0 0 0 1 2 3 4 -40 5 -20 0 20 40 60 80 VCOM (V) VCOM (V) TEMPERATURE (°C) SUPPLY CURRENT vs. SUPPLY VOLTAGE AND TEMPERATURE TURN-ON/TURN-OFF TIME vs. TEMPERATURE TURN-ON/TURN-OFF TIME vs.
PAGE 6
MAX4645/MAX4646 Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches Pin Description PIN MAX4645 MAX4646 NAME SOT23-5 SOT23-6 µMAX SOT23-5 SOT23-6 µMAX 1 1 1 1 1 1 COM FUNCTION Analog Switch Common Terminal 2 2 8 — — — NO Analog Switch Normally Open Terminal — — — 2 2 8 NC Analog Switch Normally Closed Terminal 3 3 7 3 3 7 GND 4 4 6 4 4 6 IN — 5 2, 3, 5 — 5 2, 3, 5 N.C. 5 6 4 5 6 4 V+ Ground Logic Control Input No Connection.
PAGE 7
Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches MAX4645 MAX4646 V+ V+ SWITCH V INPUT COM NO COM LOGIC INPUT SWITCH OUTPUT 50% 0 VOUT RL 300Ω CL 35pF t OFF IN VOUT GND LOGIC INPUT SWITCH OUTPUT 0.9 × V0UT 0.9 × VOUT 0 t ON CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL VOUT = VCOM RL + RON ( t r < 5ns t f < 5ns V+ LOGIC INPUT WAVEFORMS INVERTED FOR SWITCHES THAT HAVE THE OPPOSITE LOGIC SENSE. ) Figure 2.
PAGE 8
MAX4645/MAX4646 Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches _________________________________Test Circuits/Timing Diagrams (continued) 10nF V+ 10nF MAX4645 MAX4646 V+ MAX4645 MAX4646 V+ SIGNAL GENERATOR 0dBm COM COM V+ IN ANALYZER VIL OR VIH IN CAPACITANCE METER NO NC OR NO f = 1MHz VIL OR VIH GND GND RL Figure 4. Off-Isolation/On-Channel Bandwidth Figure 5.
PAGE 9
Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches SOT-23 5L .EPS PACKAGE OUTLINE, SOT-23, 5L 21-0057 E 1 1 _______________________________________________________________________________________ 9 MAX4645/MAX4646 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.
PAGE 10
g ( ) Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) 6LSOT.EPS MAX4645/MAX4646 Fast, Low-Voltage, 2.
PAGE 11
Fast, Low-Voltage, 2.5Ω, SPST, CMOS Analog Switches E ÿ 0.50±0.1 8 INCHES DIM A A1 A2 b H c D e E H 0.6±0.1 1 L 1 α 0.6±0.1 S BOTTOM VIEW D MIN 0.002 0.030 MAX 0.043 0.006 0.037 0.014 0.010 0.007 0.005 0.120 0.116 0.0256 BSC 0.120 0.116 0.198 0.188 0.026 0.016 6∞ 0∞ 0.0207 BSC 8LUMAXD.EPS 4X S 8 MILLIMETERS MAX MIN 0.05 0.75 1.10 0.15 0.95 0.25 0.36 0.13 0.18 2.95 3.05 0.65 BSC 2.95 3.05 4.78 5.03 0.41 0.66 0∞ 6∞ 0.