Datasheet PI5C3245L, PI5C3245P, PI5C3245Q, PI5C3245S Datasheet (PERICOM)

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PS7015A 06/28/99

Function BE A0–7

Disconnect H Hi-Z
Connect L B0–7

Truth Table

(1)

Note:

1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance

Logic Block Diagram

Product Pin Description

Pin Name Description

BE Bus Enable Input (Active LOW)
A0–7 Bus A
B0–7 Bus B
GND Ground
VCC Power

Product Pin Configuration

PI5C3245

8-Bit, 2-Port Bus Switch

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Product Features

 Near zero propagation delay
5Ω switches connect inputs to outputs
 Direct bus connection when switches are on
 Ultra Low Quiescent Power (0.2µA Typical)

 Ideally suited for notebook applications
 Pin compatible with 74 series 245 logic devices
 Packages available:

 20-pin 173 mil wide plastic TSSOP (L)

 20-pin 300 mil wide plastic PDIP (P)

 20-pin 150 mil wide plastic QSOP (Q)

 20-pin 300 mil wide plastic SOIC (S)

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 PI5C3245 is a 8-bit, 2-port bus switch designed with a low ON
resistance (5Ω) 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
(BE) input signal. The pinout is compatible with PI74FCT245T
(Octal Bidirectional Transceiver).

BE

A

7

A

0

B

7

B

0

V

CC

NC 1 20

BEA

0

219

B

0

A

1

318

B

1

A

2

417

B

2

A

3

516

B

3

A

4

615

B

4

A

5

714

B

5

A

6

813

B

6

A

7

912

B

7

GND 10 11

20-Pin

L20
P20
Q20
S20

PI5C3245

8-Bit, 2-Port Bus Switch

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PS7015A 06/28/99

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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 +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 ................................................................................... 120 mA

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.

DC Electrical Characteristics (Over the Operating Range, T

A

= –40°C to +85°C, VCC =5V ±5%)

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

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 µA

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 = –18mA –0.7 –1.2 V

I

OS

Short Circuit Current

(3)

A (B) = 0V, B (A) = V

CC

100 mA

V

H

Input Hysteresis at Control Pins 150 mV

R

ON

Switch On Resistance

(4)

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

Capacitance (T

A

= 25°C, f = 1 MHz)

Parameters

(5)

Description Test Conditions Max. Units

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.

PI5C3245

8-Bit, 2-Port Bus Switch

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PS7015A 06/28/99

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1
2

3

4
5

6

7
8
9
10
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12
13
14
15

Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

I

CC

Quiescent Power VCC = Max. VIN = GND or V

CC

0.1 3.0 µA

Supply Current

∆I

CC

Supply Current per V

CC

= Max. VIN = 3.4V

(3)

2.5 mA

Input @ TTL HIGH

I

CCD

Supply Current per VCC = Max., 0.25 mA/
Input per MHz

(4)

A and B Pins Open MHz
BE = GND
Control Input Toggling
50% Duty Cycle

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.

Switching Characteristics over Operating Range

PI5C3245

Com.

Parameters Description Conditions

(1)

Min. Max. Units

t

PLH

Propagation Delay

(2,3)

CL = 50pF 0.25

t

PHL

Ax to Bx, Bx to Ax R

L

= 500Ω

t

PZH

Bus Enable Time 1.5 6.5 ns

t

PZL

BE to Ax or Bx

t

PHZ

Bus Disable Time 1.5 5.5

t

PLZ

BE to Ax or Bx

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 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.

Pericom Semiconductor Corporation

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

N/PegakcaPhtdiW

5IPQ5423C)02Q(POSQ-02lim-051

5IPS5423C)02Q(CIOS-02lim-003

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