Datasheet PI2BV3877L, PI2BV3877Q Datasheet (PERICOM)

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V

CC

B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

B

8

B

9

BE

1

1
2
3
4
5
6
7
8
9
10
11
12

24
23
22
21
20
19
18
17
16
15
14
13

BE

0

A

0

A

1

A

2

A

3

A

4

A

5

A

6

A

7

A

8

A

9

GND

PI2BV3877

2.5V, 10-Bit, 2-Port

266 MHz DDR BusSwitch

Product Features

 Used in X4 DDR modules
 Near zero propagation delay
 20 Ohm switches connect inputs to outputs
 Fast Switching Speed 3ns (max.)
 Low Off Capacitance (3pF)
 Pull-down on B output
 Pull-up on Switch Enable
 Packages available:

 24-pin 150 mil wide plastic QSOP (Q)
 24-pin 173 mil wide plastic TSSOP (L)

Logic Block Diagram

A

0

A

4

Vcc

Product Description

Pericom Semiconductors PI2B series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.

The PI2BV3877 is a 10-bit, 2.5 volt two-port bus switch designed with
a low ON resistance allowing inputs to be connected directly to
outputs. The bus switch creates no additional propagational delay
or additional ground bounce noise. The switches are turned ON by
the Bus Enable (BEN) input signals.

The PI2BV3877 switch is intended for 266 MHz DDR(X4) Memory
Module Applications.

Product Pin Configuration

B

0

B

4

24-Pin

Q, L

BE0

A

5

A

9

B

5

B

9

Vcc

Truth Table

BE1

Product Pin Description

Pin Name Description

BE0, BE1 Bus Enable Input (Active LOW)
A09 Bus A
B09 Bus B
GND Ground
V

CC

Power

Function BE0 A0A4

Disconnect H Hi-Z
Connect L B04

Function BE1 A5A9

Disconnect H Hi-Z
Connect L B5B9

Notes: 1. H = High Voltage Level

1

(1)

L = Low Voltage Level
Hi-Z = High Impedance

PS8472A 05/02/00

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 (Inputs & VCC Only) ........ 0.5V to +4.6V

Supply Voltage to Ground Potential (Outputs & D/O Only) ......0.5V to +4.6V

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

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

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

PI2BV3877

2.5V, 10-Bit, 2-Port

266 MHz DDR BusSwitch

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.

DC Electrical Characteristics (Over the Operating Range, T

Parameters Description Test Conditions

V
V
I
V

R

IH

IL

OZH

IK

ON

Input HIGH Voltage (BE0, BE1) Guaranteed Logic HIGH Level 1.6 VCC+ 0.3
Input LOW Voltage (BE0, BE1) Guaranteed Logic LOW Level 0.3 0.9
High Impedance Output Current B @ 2.5V 250 µA
Clamp Diode Voltage VCC = Min., IIN = 18mA 1.2 V

Switch On Resistance

(4)

VCC = Min., VIN = 0.9V, ION = 20mA 17 33

= 0°C to +85°C, VCC = 2.3V to 2.7V)

A

(1)

Min. Typ.

(2)

VCC = Min., VIN = 1.6V, ION = 15mA 22 30

R

PU

Capacitance (T

Parameters

C

IN

C

OFF

C

(A/B) A/B Capacitance, Switch On VIN = 0V 7

ON

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 = 2.5V, TA = 25°C ambient and maximum loading.

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

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

Pull-up Resistance 115 150 200

= 25°C, f = 1 MHz)

A

(4)

Description Test Conditions Typ. Un i ts

Input Capacitance VIN = 0V 3
A Capacitance, Switch Off VIN = 0V 3 pF

Max. Units

V

Ω

Power Supply Characteristics

Parameters Description Test Conditions

I

CC

Quiescent Power VCC = Max. VIN = V
Supply Current VIN = GND – 56 mA

Notes:

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

2. Typical values are at VCC = 2.5V, +25°C ambient.

3. Per TTL driven input (control input only); A and B pins do not contribute to ICC.

2

(1)

Min. Typ.

CC

(2)

Max. Units

–10µA

PS8472A 05/02/00

Switching Characteristics over Operating Range

t

PZL

Output

Control

(Low Level

Enabling)

0V

VCC/2

V

CC

/2

V

CC

/2

V

CC

/2
t

PLZ

t

PHZ

V

OL

V

OH

0V

t

PZH

+0.15V

-0.15V

Output

Waveform 1

S1 at 2xV

CC

(see Note 2)

Output

Waveform 2

S1 at GND

(see Note 2)

V

OH

V

OH

V

OL

VCC

sretemaraPnoitpircseDsnoitidnoC

t

HLP

t

LHP

)3,2(

yaleDnoitagaporP

xAotxB,xBotxA

PI2BV3877

2.5V, 10-Bit, 2-Port

266 MHz DDR BusSwitch

7783VB2IP

)3,2(

.moC

.niM.xaM

1

stinU

t

HZP

t

LZP

emiTelbanEsuB

xBroxAotEB

C

L

R

L

,Fp03=

005= ,Ω

R005= Ω

t

ZHP

t

ZLP

emiTelbasiDsuB

xBroxAotEB

13

15.3

13

18.3

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 time
constant for the switch alone is of the order of 1ns 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.

Parameter Measurements

2xV

From Output
Under Test

C

= 30pF

L

(See note 1)

500Ω

500Ω

S1

CC

Open

GND

tseT1S

t

DP

t

t/

ZLP

LZP

t

t/

ZHP

HZP

nepO

Vx2

CC

DNG

Notes:

1. CL includes probe and jig capacitance.

2. Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the output control.

3. All input pulses are supplied by generators having the following characteristics: PRR<10MHz, Z

4. The outputs are measured one at a time with one transition per measurement.

5. t

6. t

7. t

LOAD CIRCUIT

tPHL

V

CC

VCC

0V

VOH

/2VCC/2

VOL

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

= 50Ω, tR ≤ 2ns, tF ≤ 2ns.

O

3

PS8472A 05/02/00

Input

Output

t

PLH

V

/2

CC

VCC/2

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

Waveform 2 is for an output with internal conditions such that the output is HIGH except when disabled by the output control.

and t

PLZ

and t

PZL

PLH

and t

are the same as t

PHZ

are the same as tEN.

PZH

are the same as tPD.

PHL

DIS

.

24-pin QSOP (Q)

24

1

typical

.025

0.635

.033

0.84

.337
.344

8.56

8.74

.008
.012

0.203

0.305

.150
.157

.053
.069

.004
.010

3.81

3.99

1.35

1.75

0.101

0.254

SEATING
PLANE

.015 x 45˚

.016
.036

0.38

.228
.244

5.79

6.20

0.406

0.914

.005
.010

0.127

0.254

PI2BV3877

2.5V, 10-Bit, 2-Port

266 MHz DDR BusSwitch

X.XX

DENOTES DIMENSIONS

X.XX

IN MILLIMETERS

24-pin TSSOP (L)

24

1

.303
.311

7.7

7.9

.0256

BSC

0.65

X.XX

DENOTES CONTROLLING

X.XX

DIMENSIONS IN MILLIMETERS

.007
.012

0.19

0.30

.169
.177

.002
.006

.047

1.20

Max

4.3

4.5

0.05

0.15

SEATING
PLANE

0.45

0.75

.252
BSC

6.4

.018
.030

.004
.008

0.09

0.20

Ordering Information

traPegakcaP-niPerutarepmeT

Q7783VB2IP)Q(POSQ-42

C°58+otC°0

L7783VB2IP)L(POSST-42

Pericom Semiconductor Corporation

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

4

PS8472A 05/02/00