Datasheet PI3B162861, PI3B16861 Datasheet (PERICOM)

1

PS8175B 11/06/98

PI3B16861/PI3B162861

3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch

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Product Description

Pericom Semiconductor’s PI3B series of Bus Switch circuits are
produced in the Company’s advanced 0.35 micron CMOS
technology, achieving industry leading speed.

The PI3B16861 is configured as a 3.3 volt, hot insertion, 20-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 switch is turned ON by the Bus Enable
(BEx) input signal.

The PI3B162861 device has a built-in 25-ohm series resistor to
reduce noise resulting from reflections, thus eliminating the need
for an external terminating resistor.

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Function BEX A19-A0

Disconnect H Hi-Z
Connect L B19-B0

Truth Table

(1)

Note:

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

Pin Name Description

BEx Bus Enable Inputs (Active LOW)
A19-A0 Bus A
B19-B0 Bus B

Product Pin Description

Product Pin Configuration

PI3B16861

PI3B162861 (25

ΩΩ

ΩΩ

Ω)

3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch

Product Features

• Near-zero propagation delay

•5Ω or 25Ω switches connect inputs to outputs

• Fast Switching Speed - 5ns (max.)

• Direct bus connection when switches are ON

• Permits Hot Insertion

• 32X384 function with flow through pinout make board
layout easier

• Vcc Operating Range: 3.0V to 3.6V

• Industrial operating temperature: –40°C to +85°C

• Packages available:
– 48-pin 240-mil wide plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
– 48-pin 150-mil wide plastic BQSOP (B)

Logic Block Diagram

BE

1

A

9

A

0

B

9

B

0

BE

2

A

19

A

10

B

19

B

10

NC

A

0

A

1

A

2

A

3

A

4

A

5

A

6

A

7

A

8

A

9

GND

NC

A

10

A

11

A

12

A

13

A

14

A

15

A

16

A

17

A

18

A

19

GND

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

VCC
BE

1

B

0

B

1

B

2

B

3

B

4

B

5

B

6

B

7

B

8

B

9

VCC
BE

2

B

10

B

11

B

12

B

13

B

14

B

15

B

16

B

17

B

18

B

19

48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25

2

PS8175B 11/06/98

PI3B16861/PI3B162861

3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch

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DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, V

CC

= 3.0V to 3.6V)

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

VIH Input HIGH Voltage Guaranteed Logic HIGH Level 2.0 — — V
VIL Input LOW Voltage Guaranteed Logic LOW Level –0.5 — 0.8 V
IIH Input HIGH Current VCC = Max., VIN = VCC ——±1µA
IIL Input LOW Current VCC = Max., VIN = GND — — ±1 µA
IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ——±1µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA — –0.7 –1.2 V
RON Switch On Resistance

(3)

VCC = Min., VIN = 0.0V, 16861 — 5 8 Ω
ION = 48mA 162861 20 28 40
VCC = Min., VIN = 2.4V, 16861 — 10 15 Ω
ION = 15mA 162861 20 35 48

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

Ambient Temperature with Power Applied .................................. –0°C to +85°C

Supply Voltage Range..................................................................–0.5V to +4.6V

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

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

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

Maximum Ratings

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

Capacitance (TA = 25°C, f = 1 MHz)

Parameters

(4)

Description Test Conditions Typ Units

CIN Input Capacitance VIN = 0V 3.0 pF

COFF A/B Capacitance, Switch Off VIN = 0V 8.5 pF

CON A/B Capacitance, Switch On VIN = 0V 17.0 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 = 3.3V, 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.

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 o t h e r 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.

3

PS8175B 11/06/98

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PI3B16861/PI3B162861

3.3V, Hot Insertion, 20-Bit, 2-Port BusSwitch

PI3B16861/PI3B162861

Com.

Parameters Description Conditions

(1)

Min. Max. Units

tPLH Propagation Delay

(2,3)

CL = 50pF 16861 — 0.25

tPHL Ax to Bx, Bx to Ax RL = 500Ω 162861 — 1.25
t

PZH Bus Enable Time C L = 50pF, 1 4.5 ns

t

PZL BE to Ax or Bx RL = 500Ω,

t

PHZ Bus Disable Time R = 500Ω 1 5

t

PLZ BE to Ax or Bx

Switching Characteristics over Operating Range

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

Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

ICC Quiescent Power VCC = Max. VIN = GND or VCC 10 µA

Supply Current

∆ICC Supply Current per VCC = Max. VIN = 3.0V

(3)

750 µA

Input @ TTL HIGH

ICCD 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 = 3.3V, +25°C ambient.

3. Per TTL driven input (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.