PS398CSEEX - Pericom Semiconductor Corp.

PS398/PS399

Precision 8-Ch, Diff. 4-Ch,

17V Analog Multiplexers

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1PS8185F 09/28/04

Features

•Low On-Resistance (60-ohm typ.) Minimizes Distortion

and Error Voltages

•Low Glitching Reduces Step Errors and Improves

Settling Times. Charge Injection: <5pC

•Split-Supply Operation (+3V to +8V)

•Improved Second Sources for MAX398/MAX399

•On-Resistance Matching Between Channels: <6Ohm

•On-Resistance Flatness: <11-ohm

•Low Off-Channel Leakage,

INO(OFF) < 1nA @ +85oC, ICOM(ON), <2.5nA @ +85oC

•TTL/CMOS Logic Compatible

•Fast Switching Speed, tTRANS <250ns

•Break-Before-Make action eliminates momentary crosstalk

•Rail-to-Rail Analog Signal Range

•Low Power Consumption, <300µW

•Packaging (Pb-free & Green available):

- 16-pin SOIC (W)

Applications

•Data Acquisition Systems

•Audio Switching and Routing

•Test Equipment

•PBX, PABX

•Telecommunication Systems

•Battery-Powered Systems

Description

The PS398/PS399 are improved high precision analog multiplexers.

The PS398, an 8-channel single-ended mux, selects one of eight

inputs to a common output as determined by a 3-bit address

A0-A2. An EN (enable) pin when low disables all switches, use-

ful when stacking several devices. The PS399 is a 4-channel

differential multiplexer. It selects one of four differential inputs to

a common differential output as determined by a 2-bit address A0,

A1. An EN pin may be driven low to disable all switches.

These multiplexers operate with dual supplies from +3V to +8V.

Single-supply operation is possible from +3V to +15V.

With +5V power supplies, the PS398/PS399 guarantee <100-ohm

on-resistance. On-Resistance matching between channels is within

6-ohm. On-Resistance flatness is less than 11-ohm over the speci-

fied signal range.

Each switch conducts current equally well in either direction when

on. In the off state each switch blocks voltages up to the power-

supply rails.

Both devices guarantee low leakage currents (<2.5nA at +85oC)

and fast switching speeds (tTRANS <250ns). Break-before-make

switching action protects against momentary crosstalk between

channels.

Block Diagrams and Pin Configurations

Decoders/Drivers

V-

NO1

NO2

NO3

NO4

COM

GND

V+

NO5

NO6

NO7

NO8

Decoders/Drivers

V-

NO1A

NO2A

NO3A

NO4A

COMA

GND

V+

NO1B

NO2B

NO3B

NO4B

COMB

PS398 PS399

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

PS398

A2 A1 A0 EN On Switch

X X X 0 None

0 0 0 1 1

0 0 1 1 2

0 1 0 1 3

0 1 1 1 4

1 0 0 1 5

1 0 1 1 6

1 1 0 1 7

1 1 1 1 8

Caution: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating

and operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied.

Thermal Information

Continuous Power Dissipation

SOIC (derate 8.7mW/ °C above +70°C) ........................... 650mW

Storage Temperature ........................................ –65°C to +150°C

Lead Temperature (soldering, 10s) .................................. +300°C

Note 1: Signals on NO, COM, or logic inputs exceeding V+ or V- are

clamped by internal diodes. Limit forward diode current to 30mA.

Absolute Maximum Ratings

Voltages Referenced to V-

V+ ....................................................................... -0.3V to + 17V

GND .................................................................... -0.3V to + 17V

GND ........................................................... -0.3V to ( V+) + 0.3V

VIN, VCOM, VNO (Note 1) ................... (V-) -2V to (V+) + 2V

or 30mA, whichever occurs first

Current (any terminal ) ......................................................... 30mA

Peak Current, COM, NO, NC

(pulsed at 1ms, 10% duty cycle) ..................................... 100mA

ESD per method 3015.7 .................................................. > 2000V

Truth Tables

993SP

1A0ANEhctiwSNO

XX 0 enoN

001 1

011 2

10 1 3

111 4

Logic “0”, VAL ≤ 0.8V

Logic “1”, VAH ≥ 2.4V

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Electrical Specifications - Dual Supplies (V± = ±5V ± 10%, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V)

retemaraPlobmySsnoitidnoC)C°(.pmeT.niM

)2(

.pyT

)1(

.xaM

)2(

stinU

hctiwSgolanA

egnaRlangiSgolanA

)3(

GOLANA

lluF-V+VV

ecnatsiseRnO R

,V5.4-=-V,V5.4=+V

MOC

V5.3±=

,Am1=

5206001

mhO

lluF521

hctaMecnatsiseR-nO

slennahCneewteB

)4(

∆R

MOC

Vro

,V5.3±=

,Am1=

V5-=-V,V5=+V

526

lluF8

ecnatsiseR-nO

ssentalF

)5(

)NO(TALF

,V5-=-V,V5=+V

V,Am1=

MOC

V0,V3±=

5211

lluF41

egakaeLffOON

tnerruC

)6(

)FFO(ON

,V5.5-=-V,V5.5=+V

MOC

,V5.4±=

V5.4±=

521.0-1.0

lluF0.1-0.1

egakaeLffO-MOC

tnerruC

)6(

)FFO(MOC

-V,V5.5=+VV5.5-=

MOC

,V5.4±=

V5.4+/-=

893SP

522.0-05

lluF5.2-001

993SP

521.0-05

lluF5.1-001

egakaeLnOMOC

tnerruC

)7(

)NO(MOC

-V,V5.5=+VV5.5-=

MOC

V5.4±=

V5.4=

893SP

524.0-4.0

lluF5-5

993SP

522.0-2.0

lluF5.2-5.2

tupnIcigoL

tupnIhgiHcigoL

egatloV

,HA

HNE

lluF

4.2

tupnIwoLcigoL

egatloV

LNE

8.0

tupnIhtiwtnerruCtupnI

hgiHegatloV I

HNE

V4.2=1.0-1.0

µA

tupnIhtiwtnerruCtupnI

woLegatloV I

,LA

LNE

V8.0=1.0-1.0

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

retemaraPlobmySsnoitidnoCpmeT )C°( .niM )1( .pyT )2( .xaM )1( stinU

cimanyD

emiTnoitisnarTt

SNART 1erugiF051

ekaM-erofeB-kaerB

yaleDemiT tNEPO erugiF3 0 04

emiTnO-nruTelbanEt

)NE(NO erugiF2

5227051

lluF052

emiTffO-nruTelbanEt

)NE(FFO erugiF2

5255051

lluF002

noitcejnIegrahC )3( QC

L=,Fn1V

SR,V0= SmhO0=,

8.25Cp

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NE =0 R,V L=f,mhOk1=zHk001101-

klatssorCX

KLAT RL=k1=f,mhOzHk001,erugiF6 29-

ecnaticapaCtupnIcigoLC

NI zHM1=f5.2

ecnaticapaCffOONC

)FFO(ON zHM1=fV,NE V= ON =V06.3

ecnaticapaCffOMOCC

)FFO(MOC zHM1=f,

VNE V= MOC =V0

893SP13

993SP41

ecnaticapaCnOMOC C)NO(MOC zHM1=fV,MOC =V0

893SP53

993SP02

ylppuS

egnaRylppuS-rewoP

lluF

3±8±V

tnerruCylppuSevitisoP+I

VNE V= A,+VroV0=

V+ V5.5-=-V,V5.5=

1-1

µAtnerruCylppuSevitageN-I1-1

tnerruCdnuorGI

DNG 1-1

Notes:

1. Algebraic convention, where the most negative value is a minimum and the most positive is a maximum, is used in this data sheet.

2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.

3. Guaranteed by design.

4. ∆RON = RON max - RON min.

5. Flatness is defined as the difference between the maximum and minimum values of on-resistance measured.

6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25ºC.

7. Off Isolation = 20log10 VCOM / VNO. See Figure 5.

Electrical Specifications - Dual Supplies (V± = ±5V ± 10%, GND = 0V, VAH = VENH = 2.4V, VAL = VENL = 0.8V)

(continued)

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

retemaraPlobmySsnoitidnoCpmeT )C°( .niM )1( .pyT )2( .xaM )1( stinU

hctiwS

egnaRlangiSgolanA )3( V,MOC VON lluF0 +VV

ecnatsiseRnOR

NO ION V,Am1= MOC ,V5.3=

V5.4=+V

52001522

mhO

lluF082

RNO neewteBgnihctaM

slennahC )4( ∆RNO ION V,Am1= MOC ,V5.3=

V5.4=+V

5211

lluF31

ssentalFecnatsiseR-nOR

TALF ION V,Am1= MOC ,V5.2,V5.1=

V5=+V,V5.3

5281

lluF22

egakaeLffO-ON

tnerruC )8( I)FFO(ON VON V,V5.4= MOC =,V0

V5.5=+V

521.0-1.0

nΑ

lluF0.1-0.1

egakaeLffO-MOC

tnerruC )8( I)FFO(MOC

VMOC V,V5.4= ON

,V0=

V5.5=+V

893SP

522.0-05

lluF5.2-001

993SP

522.0-05

lluF5.1-001

egakaeLnO-MOC

tnerruC )8( I)NO(MOC

VMOC V,V5.4= ON

,V5.4=

V5.5=+V

893SP

524.0-4.0

lluF5-5

993SP

522.0-2.0

lluF5.2-5.2

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egatloVtupnIhgiHcigoLV

HA V, HNE

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4.2

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HA V, NEL 8.0

tupnIhtiwtnerruCtupnI

hgiHegatloV IHA ,I NEH VA=V NE V4.2=1.0-1.0

µA

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ylppuS

egnaRylppuS-rewoP+V

lluF

351V

tnerruCylppuS-evitisoP+I

VNE V0ro+V=,V

AV0=,

V5.5=+V,V0=-V

0.1-0.1 Αµ

tnerruCylppuS-evitageN-I0.1-0.1

tnerruCdnuorGI

DNG 0.1-0.1

Electrical Characteristics - Single 5V Supply

(V+ = + 5V ± 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL = +0.8V)

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Electrical Characteristics - Single 5V

(V+ = +5V ± 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL= +0.8V (continued)

Electrical Characteristics - Single 3V Supply

(V+ = +3V ± 10%, V- = 0V, GND = 0V, VAH = VENH = +2.4, VAL = VENL = +0.8V)

Notes:

1. The algebraic convention, where the most negative value is a minimum and the most positive is a maximum,

is used in this data sheet.

2. Typical values are for DESIGN AID ONLY, not guaranteed or subject to production testing.

3. Guaranteed by design

4. ∆RΟΝ = RΟΝ max - RΟΝ min

5. Flatness is defined as the difference between the maximum and minimum value of on-resistance measured.

6. Leakage parameters are 100% tested at maximum rated hot temperature and guaranteed by correlation at +25ºC.

7. Worst-case isolation is on channel 4 because of its proximity to the COM pin.

Off isolation = 20log VCOM/VNO, VCOM = output, VNO = input to off switch

8. Leakage testing at single supply is guaranteed by testing with dual supplies.

retemaraPlobmySsnoitidnoCpmeT )C°( .niM )1( .pyT )2( .xaM )1( stinU

cimanyD

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011002

lluF572

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)NE(FFO

5256521

lluF002

noitcejnIegrahC )3( QC

LV,Fn1= SR,V0= SmhO0=528.25Cp

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hctiwS

egnaRlangiSgolanA )3( VGOLANA lluF0 +VV

ecnatsiseR-nOR

NO ION V,Am1= MOC ,V5.1=

V3=+V

52061573

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lluF524

cimanyD

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V1ON V,V5.1= 8ON V0=

002575

snemiTnO-nruTelbanE )3( t)NE(NO V,2erugiF HNI V4.2=

VLNI V,V0= 1ON V5.1= 002005

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VLNI V,V0= 1ON V5.1= 29004

noitcejnIegrahC )3( QC

LV,Fn01= SR,V0= SmhO0=25Cp

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Test Circuits/Timing Diagrams

Figure 1. Transition Time

Figure 2. Enable Switching Time

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Figure 3. Break-Before-Make Interval

Figure 4. Charge Injection

IS THE MEASURED VOLTAGE DUE TO CHARGE

TRANSFER WHEN THE CHANNEL TURNS OFF.

V+

+5V

COM

GND

-5V

V-

C =1000pF

OUT VEN

VOUT

Logic

Input

0FF 0FF

+3V ON

PS398

Channel

Select

L∆VOUT

∆V

OUT

OUT x C

X C X C

Figure 5. Off Isolation Figure 6. CrossTalk

∆

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Figure 8. NO/COM Capacitance

Figure 9. Overvoltage protection is accomplished using two

external blocking diodes or two current limiting resistors.

V+

Positive Supply

COMNO

V-

Applications

Overvoltage Protection

Proper power-supply sequencing is recommended for all CMOS

devices. Do not exceed the absolute maximum ratings, because

stresses beyond the listed ratings may cause permanent damage to

the devices. Always sequence V+ on first, followed by V-, and then

logic inputs. If power-supply sequencing is not possible, add two

small signal diodes or two current limiting resistors in series with

the supply pins for overvoltage protection (Figure 9). Adding

diodes reduces the analog signal range, but low switch resistance

and low leakage characteristics are unaffected.

Maximum Sampling Rate

From the sampling theorem, the sampling frequency needed to

properly recover the original signal should be more than twice

its maximum component frequency. In real applications,

sampling at three or four times the maximum signal frequency is

customary.

The maximum sampling rate of a multiplexer is determined by its

transition time (tTRANS), the number of channels being multiplexed,

and the settling time (tSETTLING) of the sampled signal at the out-

put. The maximum sampling rate is:

_______________ (1)

n (tTRANS + tSETTLING)

Where n = number of channels scanned: 8 for PS398,

4 for PS399. tTRANS is given on the specification table: 150 ns max.

Settling time is the time needed for the output to stabilize within

the desired accuracy band of +1 LSB (least significant bit).

Other factors determining settling time are: signal source imped-

ance, capacitive load at the output. Figure 10 illustrates the steady

state model. To figure out what the settling time due to the multi-

plexer is, we can assume that RS = 0Ω, and CL = 0. In real life, the

effects of RS and CL should be taken into account when perform-

ing these calculations.

fS =

V+

+5V

-5V

COM

GND V-

N01

N08

EN f

PS398

=1MHz

Channel

Select 1MHz

Capacitance

Analyzer

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

The table below shows how many time constants (mτ) are

needed to reach an accuracy of one LSB. τ = RON x CCOM(ON)

Bits Accuracy (%) m

8 0.25 6

12 0.012 9

15 0.0017 11

Now, let’s calculate what the maximum sampling rate for the

PS398. Assume a 12-bit accuracy and room temperature

operation.

Figure 10. Equivalent model of one multiplexer channel

COM

(ON)

In equation (1) above, n = 8, tTRANS = 150ns, tSETTLING = 9τ,

τ = 100ohm x 54pF

_______________________ ,

8 [150ns + 9(100ohm x 54pF)]

or fS = 630kHz.

Assuming a x4 oversampling rate, the maximum sampling speed

for the PS398 would be 630÷4 = 157kHz.

fS = 1

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PS398/PS399

Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers

Packaging Mechanical: 16-pin SOIC (W)

SEATING PLANE

.050

BSC

0-8˚

.149

.157

X.XX

X.XX DENOTES DIMENSIONS

IN MILLIMETERS

3.78

3.99

.386

.393

9.80

10.00

1.27

.053

.068 1.35

1.75 .2284

.2440

5.80

6.20

.0040

.0098 0.10

0.25

.013

.020

.0155

.0260

0.330

0.508

0.393

0.660

.0075

.0098

0.25

0.50

.0099

.0196 x 45˚

0.19

0.25

.016

.050

0.41

1.27

REF

Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com

Notes:

1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/

Ordering Information

Ordering Code Package Code Package Type

PS398CSE W 16-pin SOIC

PS398CSEE W Pb-free & Green, 16-pin SOIC

PS398ESE W 16-pin SOIC

PS398ESEE W Pb-free & Green, 16-pin SOIC

PS399CSE W 16-pin SOIC

PS399CSEE W Pb-free & Green, 16-pin SOIC

PS399ESE W 16-pin SOIC

PS399ESEE W Pb-free & Green, 16-pin SOIC