Datasheet PI3B3257L, PI3B3257Q, PI3B3257W Datasheet (PERICOM)

PI3B3257

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3.3V, Quad 2:1

Mux/Demux Bus Switch

Product Features

 Near zero propagation delay

 5-ohm switches connect inputs to outputs

 Fast Switching Speed: 4.8ns max.

 Ultra-Low Quiescent Power: 0.1µA typical

 Ideally suited for notebook applications

 Pin compatible with 74 series 257 logic devices

 Packages available:

 16-pin 150 mil wide plastic QSOP (Q)
 16-pin 150 mil wide plastic SOIC (W)
 16-pin 173 mil wide plastic TSSOP (L)

Logic Block Diagram

IA1IB0IB1IC0IC1ID0ID

IA

0

E

S

Product Description

Pericom Semiconductors PI3B series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.

The PI3B3257 is a 3.3 Volt, Quad 2:1 multiplexer/demultiplexer with
three-state outputs that is pinout and function compatible with the
PI74FCT257T, 74F257, and 74ALS/AS/LS257. Inputs can be
connected to outputs with low ON resistance (5 ohms) with no
additional ground bounce noise or propagation delay.

16-Pin Product Configuration

1

IA0
IA1

YA

IB0

IB1

YB

GND

S

1
2
3
4
5
6
7
8

16-Pin

Q, W, L

16
15
14
13
12
11

10

9

V

CC

E
ID0
ID1
YD
IC0
IC1
YC

Product Pin Description

YA YB YC YD

Truth Table

(1)

ES AYBYCYDYnoitcnuF

HX Z-iHZ-iHZ-iHZ-iHelbasiD

LL 0AI0BI0CI0DI0=S

LH 1AI1BI1CI1DI1=S

Note: 1. H = High Voltage Level

L = Low Voltage Level

1

emaNniPnoitpircseD

nDI-nAIstupnIataD

SstupnItceleS

EelbanE

DY-AYstuptuOataD

DNGdnuorG

ccVrewoP

CNtcennoCoN

PS8151F 05/07/01

Maximum Ratings

(Above which the useful life may be impaired. For user guidelines, not tested.)

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

Ambient Temperature with Power Applied ..................................... 40°C to +85°C

Supply Voltage to Ground Potential ................................................. 0.5V to +4.6V

DC Input Voltage .............................................................................. 0.5V to +4.6V

DC Output Current ....................................................................................... 120mA

Power Dissipation ............................................................................................ 0.5W

Note:

Stresses greater than those listed under MAXIMUM RATINGS may cause permanent
damage to the device. This is a stress rating only and functional operation of the device
at these or any other conditions above those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect reliability.

PI3B3257

3.3V, Quad 2:1

Mux/Demux Bus Switch

DC Electrical Characteristics (Over the Operating Range, T

sretemaraPnoitpircseDsnoitidnoCtseT

V

HI

V

LI

I

HI

LI

I

HZO

V

KI

R

NO

Capacitance (T

= 25°C, f = 1 MHz)

A

egatloVHGIHtupnIleveLHGIHcigoLdeetnarauG0.2

egatloVWOLtupnIleveLWOLcigoLdeetnarauG5.08.0

tnerruCHGIHtupnIV

tnerruCWOLtupnIV

egatloVedoiDpmalCV

)3(

ecnatsiseRNOhctiwS

tnerruCtuptuOecnadepmIhgiH0≤ I

V
V

CC

CC

NY,N

CC

CC

CC

= 40°C to +85°C, VCC =3.3V ±10%)

A

)1(

V,.xaM=

V=

NI

CC

≤ V

I,.niM=

V,.niM=
V,.niM=

V,.xaM=

NI

NI

NI

NI

DNG=1±

CC

Am81=2.1V

I,V0.0=

NO

I,V4.2=

NO

Am51=

.niM.pyT

)2(

.xaMstinU

1±

1±

Am46roAm84=

5

01

8

71

sretemaraPnoitpircseDsnoitidnoCtseTlacipyTstinU

C

NI

C

NYFFO

C

NIFFO

C

NO

Y

I

N

INY/

N

N

ecnaticapaCtupnIV

ffOhctiwS,ecnaticapaCV

ffOhctiwS,ecnaticapaCV

nOhctiwS,ecnaticapaCV

V0=0.3

NI

V0=0.71

NI

V0=5.8

NI

V0=0.52

NI

Notes:

1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at VCC = 3.3V, TA = 25°C ambient and maximum loading.

3. Measured by the voltage drop between I and Y pin at indicated current through the switch. ON resistance is determined by the
lower of the voltages on the two (I,Y) pins.

4. This parameter is determined by device characterization but is not production tested.

V

AµI

Ω

Fp

2

PS8151F 05/07/01

Power Supply Characteristics

sretemaraPnoitpircseDsnoitidnoCtseT

PI3B3257

3.3V, Quad 2:1

Mux/Demux Bus Switch

)1(

.niMpyT

)2(

.xaMstinU

∆I

I

CC

CC

tnerruCylppuSrewoPtnecseiuQV

)4,3(

HGIHLTT@tupnIreptnerruCylppuS

CC

V

CC

.xaM=VNIroDNG=V

.xaM=V

=V0.3057

NI

CC

1.00.3

Notes:

1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.

2. Typical values are at VCC = 3.3V, +25°C ambient.

3. Per TTL driven input (control inputs only); I and Y pins do not contribute to ICC.

4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified
frequency. The I and Y inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is
guaranteed by design.

Switching Characteristics over Operating Range

7523B3IP

sretemaraPnoitpircseDsnoitidnoC

t

YI

t

YS

t

HZP

t

LZP

t

ZHP

t

ZLP

)3,2(

nYotnIyaleDnoitagaporP

nYotnS,emiTtceleSsuB15.4

nYotE,emiTelbanEsuB15.4

nYotE,emiTelbasiDsuB18.4

C

L

R

L

)1(

.niM.xaM

52.0

Fp05=

005= Ω

Aµ

stinU.moC

sn

Notes:

1. See test circuit and waveforms.

2. This parameter is guaranteed but not tested on Propagation Delays.

3. The bus switch contributes no propagational delay other than the RC delay of the ON resistance of the switch and the load capacitance.
The switchs time constant alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times
of typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in
a system is determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.

3

PS8151F 05/07/01

16-Pin QSOP (Q) Package

16

1

.189
.197

4.80

5.00

.150
.157

3.81

3.99

Guage Plane

.010

0.254

Detail A

.016
.035

0.41

0.89

.041

1.04
REF

.015 x 45°

.008

0.20
MIN.

0.38

.008
.013

0.20

0.33

PI3B3257

3.3V, Quad 2:1

Mux/Demux Bus Switch

0˚-6˚

.008

0.203

.025

BSC

0.635

16-Pin SOIC (W) Package

16

1

.0155
.0260

0.393

0.660

REF

REF

.008
.012

0.203

0.305

.386
.393

9.80

10.00

.053
.069

.004
.010

1.35

1.75

SEATING
PLANE

0.101

0.254

DENOTES DIMENSIONS

X.XX

IN MILLIMETERS

X.XX

3.78

.149

3.99

.157

1.35

.053

1.75

.068

SEATING PLANE

0-8˚

0.41

1.27

.228
.244

5.79

6.19

0.41

1.27

.2284
.2440

.016
.050

.0099
.0196

5.80

6.20

.016
.050

0.25

0.50

Detail A

x 45˚

.007
.010

.0075
.0098

0.19

0.25

0.178

0.254

.050
BSC

1.27

.013
.020

0.330

0.508

.0040
.0098

0.10

0.25

X.XX

DENOTES DIMENSIONS

X.XX

IN MILLIMETERS

4

PS8151F 05/07/01

16-Pin TSSOP (L) Package

16

PI3B3257

3.3V, Quad 2:1

Mux/Demux Bus Switch

1

.193
.201

4.9

5.1

.0256

BSC

0.65

Ordering Information

.007
.012

0.19

0.30

.169
.177

.002
.006

4.3

4.5

.047
max.

1.20

0.05

0.15

SEATING
PLANE

0.45

0.75
.252

BSC

6.4

X.XX

DENOTES CONTROLLING

X.XX

DIMENSIONS IN MILLIMETERS

.018
.030

.004
.008

0.09

0.20

traPegakcaP-niPhtdiW

Q7523B3IP)Q(POSQ-61lim-051

W7523B3IP)W(CIOS-61lim-051

L7523B3IP)L(POSST-61lim-371

Pericom Semiconductor Corporation

2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax [phone] • http://www.pericom.com

5

PS8151F 05/07/01