Datasheet

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_______________General Description

The MAX354/MAX355 fault-protected multiplexers

(muxes) use a series N-channel, P-channel, N-channel

structure that protects the devices from overvoltage up

to 40V beyond the supply rails during power-up, power-

down, and fault conditions. The MAX354/MAX355 also

protect sensitive circuit components against voltages

near or beyond the normal supplies.

The MAX354 single 8-channel mux and the MAX355

dual 4-channel mux protect analog signals while oper-

ating from a single 4.5V to 36V supply or ±4.5V to ±18V

dual supplies. These muxes have 350Ω on-resistance

and can be used for demultiplexing as well as multi-

plexing. Input leakage current is less than 0.5nA at

+25°C and less than 5nA at +85°C.

All digital inputs have 0.8V and 2.4V logic thresholds,

ensuring both TTL and CMOS logic compatibility with-

out pull-up resistors. Break-before-make operation is

guaranteed and power consumption is less than

1.5mW.

________________________Applications

Data-Acquisition Systems

Industrial and Process Control

Avionics

ATE Equipment

Signal Routing

Redundant/Backup Systems

____________________________Features

♦ 350Ω Max On-Resistance

♦ Improved 2nd Source for MAX358/MAX359 and

DG458/DG459

♦ Pin Compatible with ADG508F/ADG509F

♦ All Switches Off with Supplies Off

♦ On Switch Turns Off with Overvoltage

♦ Output Clamps at 1.5V Below Supply Rails

♦ 0.5nA Max Input Leakage at +25°C (5nA at +85°C)

♦ No Power-Up Sequencing Required

♦ TTL and CMOS-Logic Compatibility

______________Ordering Information

* Dice are tested at T

= +25°C only.

** Contact factory for availability.

________________________________________________________________

Maxim Integrated Products

GND

V+

NO1

V-

TOP VIEW

MAX354

NO5

NO6

NO7

NO8

COM

NO4

NO3

NO2

DIP/SO

LOGIC

GND

V+

NO1B

NO1A

V-

MAX355

NO2B

NO3B

NO4B

COMB

COMA

NO4A

NO3A

NO2A

DIP/SO

LOGIC

__________________________________________________________Pin Configurations

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

PART

MAX354CPE

MAX354CWE

MAX354C/D 0°C to +70°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

16 Plastic DIP

16 Wide SO

Dice*

MAX354EPE

MAX354EWE -40°C to +85°C

-40°C to +85°C 16 Plastic DIP

16 Wide SO

MAX354MJE -55°C to +125°C 16 CERDIP**

19-0389; Rev. 2; 9/96

MAX355CPE

MAX355CWE

MAX355C/D 0°C to +70°C

0°C to +70°C

0°C to +70°C 16 Plastic DIP

16 Wide SO

Dice*

MAX355EPE

MAX355EWE -40°C to +85°C

-40°C to +85°C 16 Plastic DIP

16 Wide SO

MAX355MJE -55°C to +125°C 16 CERDIP**

MAX354/MAX355

Fault-Protected Analog Multiplexers

Summary of content (12 pages)

PAGE 1
9-0389; Rev. 2; 9/96 Fault-Protected Analog Multiplexers ____________________________Features The MAX354/MAX355 fault-protected multiplexers (muxes) use a series N-channel, P-channel, N-channel structure that protects the devices from overvoltage up to 40V beyond the supply rails during power-up, powerdown, and fault conditions. The MAX354/MAX355 also protect sensitive circuit components against voltages near or beyond the normal supplies.
PAGE 2
ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND, unless otherwise noted.) V+ ...........................................................................-0.3V to +44V V- ............................................................................+0.3V to -44V V+ to V-...................................................................-0.3V to +44V Digital Inputs.........................................(V+ + 0.3V) to (V- - 0.3V) Input Overvoltage with Mux Power On V+ = +15V ...............................
PAGE 3
Fault-Protected Analog Multiplexers (V+ = +15V, V- = -15V, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP TA = +25°C -5 0.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (V+ = +15V, V- = -15V, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V, TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DYNAMIC (cont’d) COM-Off Capacitance CCOM(OFF) f = 1MHz, Figure 7, MAX354 TA = +25°C VEN = VD = 0V MAX355 11 COM-On Capacitance CCOM(ON) f = 1MHz, Figure 7, MAX354 TA = +25°C VEN = VD = 0V MAX355 28 Setting Time (Note 5) tSETT 0.1% pF 14 1 TA = +25°C 0.01% pF 5 µs 2.
PAGE 5
Fault-Protected Analog Multiplexers FAULT CURRENT vs. FAULT VOLTAGE SUPPLY CURRENT vs. TEMPERATURE I+ (VA_ = 5V) 1m FAULT CURRENT (A) I+, I- (µA) 100 V+ = +15V V- = -15V VEN = +5V 10m MAX354-6 1000 I+ (VA_ = 0V) 10 1 V+ = V- = 0V 100µ 10µ 1µ V+ = +15V V- = -15V 100m 10n 1n 100p I0.
PAGE 6
MAX354/MAX355 Fault-Protected Analog Multiplexers ______________________________________________Test Circuits/Timing Diagrams +15V V+ NO1 A2 A1 +10V NO2-NO7 A0 MAX354 VEN NO8 EN -10V COM GND VOUT V- 35pF 50Ω LOGIC INPUT VEN 300Ω -15V 50% 0V VNO1 +15V SWITCH OUTPUT VOUT V+ NO1B A1 +10V 90% 0V 90% A0 VNO8 NO1A-NO4A VEN tR < 20ns tF < 20ns +3V NO4B MAX355 EN -10V GND ON VOUT 50Ω tTRANS tTRANS COMB V35pF 300Ω -15V Figure 1.
PAGE 7
Fault-Protected Analog Multiplexers +15V VEN +2.4V V+ EN NO1–NO8 A0 +10V 50% 0V MAX354 +5V A1 VA tR < 20ns tF < 20ns +3V LOGIC INPUT VA 80% A2 COM GND SWITCH OUTPUT VOUT VOUT V- 35pF tOPEN 0V 300Ω 50Ω -15V Figure 3. Break-Before-Make Interval +15V RS V+ NO VEN VS CHANNEL SELECT LOGIC INPUT VEN EN A0 MAX354 COM A1 +3V OFF ON OFF 0V VOUT A2 CL = 1000nF GND V- ∆VOUT VOUT ∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER ERROR VCTE WHEN THE CHANNEL TURNS OFF.
PAGE 8
MAX354/MAX355 Fault-Protected Analog Multiplexers _________________________________Test Circuits/Timing Diagrams (continued) +15V NO1 VIN RS = 50Ω +15V 10nF NO1 V+ NO8 R = 1kΩ VIN COM A0 A1 A2 GND EN V- VOUT V+ NO2 NO8 MAX354 MAX354 A0 RG = 50Ω RL 1k 10nF COM A1 A2 GND EN V- VOUT RL 1k 10nF 10nF -15V -15V OFF ISOLATION = 20log VOUT CROSSTALK = 20log VIN Figure 5. Off Isolation VOUT VIN Figure 6.
PAGE 9
Fault-Protected Analog Multiplexers Q1 -25V OVERVOLTAGE S -25V Q2 D N-CHANNEL MOSFET IS TURNED ON BECAUSE VGS = +25V S S D G G P-CHANNEL MOSFET IS OFF Figure 8. -25V Overvoltage with Multiplexer Power Off -15V -25V OVERVOLTAGE N-CHANNEL MOSFET IS TURNED ON BECAUSE VGS = +10V Q1 -15V FROM DRIVERS +15V Q2 +15V FROM DRIVERS Table 1 shows typical charge injection levels versus power-supply voltages and analog input voltage.
PAGE 10
MAX354/MAX355 Fault-Protected Analog Multiplexers The channel-to-channel switching time is typically 180ns, with about 100ns of break-before-make delay. This 100ns break-before-make delay prevents the input-to-input short that would occur if two input channels were simultaneously connected to the output. In a typical data acquisition system, the dominant delay is not the switching time of the multiplexer, but is the settling time of the amplifiers and S/H.
PAGE 11
Fault-Protected Analog Multiplexers Frequency 100kHz 1MHz One Channel Driven 100dB 80dB Table 2b. Typical Crosstalk Rejection Ratio Test Conditions: V IN = 20Vp-p at the tabulated frequency, RL = 1.5kΩ between OUT and ground, EN = 0V. 20Vp-p VISO = 20log ————— VOUT (p-p) Frequency 100kHz 1MHz RL = 1.5kΩ 92dB 72dB RL = 10kΩ 76dB 56dB Test Conditions: Specified RL connected from OUT to ground, EN = +5V, A0 = A1 = A2 = +5V (Channel 1 selected).
PAGE 12
MAX354/MAX355 Fault-Protected Analog Multiplexers __________________________________________________________Chip Topographies MAX354 EN A0 A1 A2 MAX355 EN GND A0 A1 GND V- V- V+ N.C. V+ N01 N01A N05 N01B 0.130" (3.30mm) 0.130" (3.30mm) N02 N06 N03 N.C. N04 COM N08 N02A N02B N03A N03B N04A N07 COMA COMB N04B 0.115" (2.92mm) 0.115" (2.