Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - multiplexers PDIP 16

General Description

The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-pro-

tected multiplexers are pin compatible with the industry-

standard DG508/DG509. The MAX4708/MAX4709 are

similar to the MAX4508/MAX4509, but these devices do

not have clamp diodes to the supply rails on the switch

outputs. These multiplexers feature fault-protected

inputs, rail-to-rail signal-handling capability, and do not

require power-supply sequencing.

Both devices offer ±40V overvoltage protection with the

supplies off, ±36V protection with the supplies on, and

feature 400Ω (max) on-resistance with 15Ω (max)

matching between channels. The MAX4708/MAX4709

operate with dual supplies of ±4.5V to ±20V or a single

supply of +9V to +36V. All digital inputs have TTL logic-

compatible thresholds, ensuring both TTL and CMOS

logic compatibility when using a single +12V supply or

dual ±15V supplies.

For low-voltage applications requiring fault protection,

refer to the MAX4711/MAX4712/MAX4713 data sheet.

Applications

Data-Acquisition Systems

Industrial and Process Control

Avionics

Signal Routing

Redundancy/Backup Systems

ATE Systems

Hot Swap

Features

♦ No Power-Supply Sequencing Required

♦ All Channels Off with Power Off

♦ Rail-to-Rail Signal Handling

♦ 400Ω (max) On-Resistance

♦ ±40V Fault Protection with Power Off

♦ ±25V Fault Protection with ±15V Supplies

♦ 100ns Fault-Response Time

♦ ±4.5V to ±20V Dual Supplies

♦ +9V to +36V Single Supply

♦ TTL/CMOS-Compatible Logic Inputs

MAX4708/MAX4709

Fault-Protected, Single 8-to-1/

Dual 4-to-1 Multiplexers

________________________________________________________________

Maxim Integrated Products

Ordering Information

GND

V+

NO1

V-

TOP VIEW

MAX4708

NO5

NO6

NO7

NO8

COM

NO4

NO3

NO2

SO/DIP

LOGIC

GND

V+

NO1B

NO1A

V-

MAX4709

NO2B

NO3B

NO4B

COMB

COMA

NO4A

NO3A

NO2A

SO/DIP

LOGIC

Pin Configurations/Functional Diagrams

19-4804; Rev 1; 12/08

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART TEMP RANGE PIN-PACKAGE

MAX4708ESE -40°C to +85°C 16 Narrow SO

MAX4708EWE -40°C to +85°C 16 Wide SO

MAX4708EPE -40°C to +85°C 16 Plastic DIP

MAX4709ESE -40°C to +85°C 16 Narrow SO

MAX4709EWE -40°C to +85°C 16 Wide SO

MAX4709EPE -40°C to +85°C 16 Plastic DIP

Pin Configurations/Functional Diagrams continued at end of data sheet.

Summary of content (15 pages)

PAGE 1
9-4804; Rev 1; 12/08 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Features ♦ No Power-Supply Sequencing Required The MAX4708/MAX4709 8-to-1 and dual 4-to-1 fault-protected multiplexers are pin compatible with the industrystandard DG508/DG509. The MAX4708/MAX4709 are similar to the MAX4508/MAX4509, but these devices do not have clamp diodes to the supply rails on the switch outputs.
PAGE 2
MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers ABSOLUTE MAXIMUM RATINGS (All Voltages Referenced to GND) V+ ........................................................................-0.3V to +44.0V V- .........................................................................-44.0V to +0.3V V+ to V-................................................................-0.3V to +44.0V COM_, A_, EN (Note 1)........................ (V+ + 0.3V) to (V- - 0.3V) NO_.................................
PAGE 3
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers (V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers ELECTRICAL CHARACTERISTICS—Dual Supplies (continued) (V+ = +15V, V- = -15V, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 5
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers (V+ = +12V, V- = 0, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 6
ELECTRICAL CHARACTERISTICS—Single +12V Supply (continued) (V+ = +12V, V- = 0, VA_H = +2.4V, VA_L = +0.8V, VEN = +2.4V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 7
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers ON-RESISTANCE vs. VCOM AND TEMPERATURE (SINGLE SUPPLY) 600 400 200 TA = +25°C 4 6 MAX4708/09 toc06 MAX4708/09 toc05 INO_OFF 10 5 DUAL SUPPLIES: ±15V 0 SINGLE SUPPLY: +12V ICOM_OFF 1 -5 -10 0.1 2 0 8 10 12 -40 -15 35 10 60 85 -15 -10 -5 0 5 10 TEMPERATURE (°C) VCOM (V) ENABLE TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (DUAL SUPPLIES) ENABLE TURN-ON/OFF TIMES vs. SUPPLY VOLTAGE (SINGLE SUPPLY) ENABLE ON/OFF TIMES vs.
PAGE 8
Typical Operating Characteristics (continued) (V+ = +15V, V- = -15V, VEN = +2.4V, TA = +25°C, unless otherwise noted.) ICOM (μA) CROSSTALK OFF-ISOLATION -60 -80 50 0 0.01 0.1 1 10 100 1000 0 -50 -100 FOR 0V < VCOM < VSUPPLY, ICOM = VCOM / RL -150 -200 0.
PAGE 9
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers MAX4708 (Single 8-to-1 Mux) MAX4709 (Dual 4-to-1 Mux) PIN NAME PIN NAME 1 A0 Address Bit 0 1 A0 Address Bit 0 2 EN Mux Enable 2 EN Mux Enable 3 V- Negative Supply Voltage. Bypass to GND with a 0.1µF capacitor. 3 V- Negative Supply Voltage. Bypass to GND with a 0.1µF capacitor.
PAGE 10
MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Detailed Description Several unique features differentiate the MAX4708/ MAX4709 from traditional fault-protected multiplexers. First, instead of the three series FETs utilized in older designs, the MAX4708/MAX4709 design employs two parallel FETs for lower on-resistance and improved flatness. Second, older devices limited the range of signal amplitudes the switch could pass by as much as 3V below the supply rails.
PAGE 11
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Ground V+ and GND power the internal logic and logic-level translators. The logic-level translators convert the logic-level inputs to V+ and V- to drive the gates of the internal FETs. In this design, there is no galvanic connection inside the MAX4708/MAX4709 between the analog signal paths and GND. ESD-protection diodes connect A_ to V+ and V-.
PAGE 12
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers MAX4708/MAX4709 Test Circuits/Timing Diagrams V+ NO1 A2 A1 +10V NO2–NO7 A0 MAX4708 +2.4V NO8 EN -10V COM GND VOUT V- CL 50Ω LOGIC INPUT VA_ RL tR < 20ns tF < 20ns +3V 50% 0V VNO1 SWITCH OUTPUT VOUT V+ NO1B A1 +10V 90% 0V 90% A0 VNO8 NO1A–NO4A +2.4V NO4B MAX4709 EN -10V GND tTRANS tTRANS COMB V- ON VOUT CL 50Ω RL Figure 2.
PAGE 13
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers VEN +2.4V V+ EN NO1–NO8 A0 LOGIC INPUT VA +10V MAX4708 50% 0V +5V A1 VA tR < 20ns tF < 20ns +3V 80% A2 COM GND SWITCH OUTPUT VOUT VOUT V- 35pF tOPEN 0V 1kΩ 50Ω Figure 4. Break-Before-Make Interval RS NO VEN VS A0 CHANNEL SELECT V+ LOGIC INPUT VEN EN MAX4708 COM +3V OFF ON OFF 0V VOUT A1 A2 ΔVOUT 1nF GND VOUT V- ΔVOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF.
PAGE 14
MAX4708/MAX4709 Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers Test Circuits/Timing Diagrams (continued) CHANNEL SELECT VNO_ V+ A2 A1 VCOM_ A0 V- EN +15V 1MHz CAPACITANCE ANALYZER NO8 MAX4708 GND +25V NO1 -15V COM f = 1MHz -25V Figure 9. Transient Behavior of Fault Condition Figure 8.
PAGE 15
Fault-Protected, Single 8-to-1/ Dual 4-to-1 Multiplexers REVISION NUMBER REVISION DATE 0 9/02 Initial release 1 12/08 Added chip process and packaging information; changed fault conditions information DESCRIPTION PAGES CHANGED ⎯ 10, 11 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.