Datasheet PI5C3126CW, PI5C3125CL, PI5C3125CQ, PI5C3125CW, PI5C3126CL Datasheet (PERICOM)

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PS8512 03/14/01

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4-Bit BusSwitch with

2V Undershoot Protection

Product Description

Pericom Semiconductors PI5C series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.

The PI5C3125C and PI5C3126C are 5V, 4-bit, 2-port bus switches.
They are intended for PCI Hot-Plug applications. Industry leading
advantages include a propagation delay of 250ps, resulting from its
5-ohm channel resistance and low I/O capacitance. The A-ports
switch data to B outputs and are bidirectional. The PI5C3125C
device has active LOW enables, and the PI5C3126C has active HIGH
enables.

The A-port can handle up to 2V undershoot when the switch is
disabled.

Product Features

R

ON

is 5ohm typical
 Undershoot protection on A port only: 2V
 Direct bus connection when switches are ON
 Industrial Operation Temperature: 40°C to +85°C
 Near zero propagation delay
 Low Channel ON Capacitance: 14pF max.
 Packages available:

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

PI5C3125C Logic Block Diagram PI5C3126C Logic Block Diagram

BE0

A0

B0

BE1

A1

B1

BE2

A2

B2

BE3

A3

B3

BE0

A0

B0

BE1

A1

B1

BE2

A2

B2

BE3

A3

B3

PI5C3125C
PI5C3126C

Applications

 PCI Hot Plugging for live insertion
 Memory bank sharing

2

PS8512 03/14/01

PI5C3125C/3126C

4-Bit Bus Switch with

2V Undershoot Protection

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PI5C3125C PI5C3126C

BEn BEn An Bn V

CC

Function

X* X Hi-Z Hi-Z GND Disconnect

H L Hi-Z Hi-Z V

CC

Disconnect

LHBnAnV

CC

Connect

PI5C3125 14-Pin Configuration

PI5C3126 14-Pin Configuration

PI5C3125 16-Pin Configuration PI5C3126 16-Pin Configuration

Product Pin Description

Pin Name Description

BEn Switch Enable (PI5C3125C)
BEn Switch Enable (PI5C3126C)
A3-A0 Bus A
B3-B0 Bu s B
V

CC

Power

GND Ground

Truth Table

(1)

Notes:

1. H = High Voltage Level, L = Low Voltage Level
HI-Z = High Impedance, X = Dont Care

* A pull-up resistor should be provided for power-up protection.

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 +7.0V

Supply Voltage to Ground Potential (Outputs & D/O Only) .... 0.5V to +7.0V

DC Input Voltage ................................................................... 0.5V to +7.0V

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.

Maximum Ratings

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

14-Pin

L,W

1
2
3
4
5
6
7

14
13
12
11
10

9
8

Vcc
BE3
A3
B3
BE2
A2
B2

BE0

A0
B0

BE1

A1
B1

GND

1
2
3
4
5
6
7

14
13
12
11
10

9
8

Vcc
BE3
A3
B3
BE2
A2
B2

BE0

A0
B0

BE1

A1
B1

GND

14-Pin

L,W

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

Vcc
BE3
A3
B3
BE2
A2
B2
NC

NC

BE0

A0
B0

BE1

A1
B1

GND

16-Pin

Q

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

Vcc
BE3
A3
B3
BE2
A2
B2
NC

NC

BE0

A0
B0

BE1

A1
B1

GND

16-Pin

Q

PI5C3125C/3126C

4-Bit Bus Switch with

2V Undershoot Protection

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PS8512 03/14/01

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Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. T yp

(2)

Max. Un i t s

I

CC

Quiescent Power VCC = Max. VIN = GND or V

CC

100 µ A

Supply Current

∆I

CC

Supply Current per VCC = Max. VIN = 3.4V

(3)

2.5 mA

Input @ TTL HIGH

DC Electrical Characteristics (Over the Operating Range, T

A

= 40°C to +85°C, VCC = 5V ± 10%)

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Un i t s

V

IH

Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 V

V

IL

Input LOW Voltage Guaranteed Logic LOW Level 0.5 0.8 V

I

IH

Input HIGH Current VCC = Max., VIN = V

CC

±1 µ A

I

IL

Input LOW Current VCC = Max., VIN = GND ±1 µA

I

OZH

High Impedance Output Current 0 ≤ A, B ≤ V

CC

±1 µA

V

IK

Clamp Diode Voltage VCC = Min., IIN =  18m A 1.8 V

V

UP

Undershoot Protection Voltage

(3)

Max Inputs, Undershoot Pulse 2.0 V
Duration <25ns

R

ON

Switch On Resistance

(4)

VCC = Min., VIN = 0.0V, ION = 48mA 5 7 ohm
VCC = Min., VIN = 2.4V, ION = 15mA 10 15

Notes:

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

2. Typical values are at VCC = 5.0V, +25°C ambient.

3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B 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 A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed
by design.

Capacitance (T

A

= 25°C, f = 1 MHz)

Parameters

(5)

Description Test Conditions Typ. Max. Un i t s

C

IN

Input Capacitance VIN = 0V 6 pF

C

OFF

A/B Capacitance, Switch Off VIN = 0V 6 pF

C

ON

A/B Capacitance, Switch On VIN = 0V 8 pF

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 = 5.0V, TA = 25°C ambient and maximum loading.

3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.

4. 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.

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

4

PS8512 03/14/01

PI5C3125C/3126C

4-Bit Bus Switch with

2V Undershoot Protection

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PI5C3125C Switching Characteristics over Operating Range

Notes:

1. See test circuit and wave forms.

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 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.

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.niM.xaM

t

HLP

t

LHP

yaleDnoitagaporP

)3,2(

AotB,BotA

C

L

Fp05=

R

L

mho005=

52.0

sn

t

HZP

t

LZP

emiTelbanEsuB5.06.6

t

ZHP

t

ZLP

emiTelbasiDsuB5.00.6

PI5C3126C Switching Characteristics over Operating Range

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t

HLP

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LHP

yaleDnoitagaporP

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mho005=

52.0

sn

t

HZP

t

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emiTelbanEsuB5.06.6

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emiTelbasiDsuB5.00.6

Applications Information

Logic Inputs

The logic control inputs can be driven up to +5.5V regardless of the
supply voltage. For example, given a +5.0V supply, BE, maybe driven
LOW to 0V and HIGH to 5.5V. Driving BE Rail-to-Rail minimizes
power consumption.

Power-Supply Sequencing

Proper power-supply sequencing is recommended for all CMOS
devices. Always apply Vcc before applying signals to the input/
output or control pins.



Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.

PI5C3125C/3126C

4-Bit Bus Switch with

2V Undershoot Protection

5

PS8512 03/14/01

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.189
.197

.053
.069

.004
.010

SEATING
PLANE

.025
BSC

.007
.010

.228
.244

1

16

.150
.157

.016
.050

X.XX
X.XX

DENOTES DIMENSIONS
IN MILLIMETERS

0.635

4.80

5.00

1.35

1.75

5.79

6.19

0.101

0.254

.008
.012

0.203

0.305

3.81

3.99

0.178

0.254

0.38

0.41

1.27

.008

0.203

.015 x 45°

REF

SEATING PLANE

.050

BSC

1

14

x 45˚

0-8˚

.149
.157

X.XX
X.XX

DENOTES DIMENSIONS
IN MILLIMETERS

3.78

3.99

.336
.344

8.55

8.75

.0155

.026

0.393

0.660

1.27

.053
.068

1.35

1.75
.2284

.2440

5.80

6.20

.013
.020

0.330

0.508

.0040
.0098

0.10

0.25

.0099
.0196

0.25

0.50

.0075
.0098

0.19

0.25

.016
.050

0.41

1.27

REF

14-Pin SOIC (W)

16-Pin QSOP (Q)

6

PS8512 03/14/01

PI5C3125C/3126C

4-Bit Bus Switch with

2V Undershoot Protection

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14-Pin TSSOP (L)

0.193

0.201

0.047

0.002

0.006

SEATING
PLANE

0.0256
typical

0.018

0.030

0.004

0.008

0.240

0.264

1

14

0.169

0.177

X.XX
X.XX

DENOTES DIMENSIONS
IN MILLIMETERS

0.05

0.15

6.1

6.7

0.45

0.75

0.09

0.20

4.3

4.5

1.20

max.

4.90

5.10

0.65

0.19

0.30

0.007

0.012

Pericom Semiconductor Corporation

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