Datasheet PI3B162244, PI3B16244 Datasheet (PERICOM)

1

PS8170B 11/06/98

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Product Features

• Near-zero propagation delay

•5Ω switches connect inputs to outputs when enabled

• Fast Switching Speed - 4ns max.

• Permits Hot Insertion

• Pin compatible with 74 series16244

• Operating Vcc: 3.0V to 3.6V

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

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

Product Description

Pericom Semiconductor’s PI3B series of logic circuits are produced
using the Company’s advanced 0.35 micron CMOS technology.

The PI3B16244 and PI3B162244 are 16-bit, 4-port bus switches
that are pin compatible with the 74 series 16244 16-bit driver. Four
enable signals (nBE) turn the switches on similar to the enable
signals of the 16244. The bus switches create no additional
propagation delay or ground bounce noise.

The PI3B162244 device has a built-in 25-ohm series resistor to
reduce noise because of reflections, thus eliminating the need for
an external terminating resistor.

PI3B16244

PI3B162244 (25

ΩΩ

ΩΩ

Ω)

3.3V, Hot Insertion, 16-Bit, 4-Port BusSwitch

Logic Block Diagram

Product Pin Description

Function nBE nA0–7

Disconnect H Hi-Z
Connect L nB0–7

Truth Table

(1)

Note: 1. H = High Voltage Level

L = Low Voltage Level
Hi-Z = High Impedance

Pin Name I/O Description

nBE I Bus Output Enable

(Active LOW)
nA0-nA7 I/O Bus A
nB0-nB7 I/O Bus B

Product Pin Configuration

1B

0

1A

0

1B

1

1A

1

1B

2

1A

2

1B

3

1A

3

1

BE

2B

0

2A

0

2B

1

2A

1

2B

2

2A

2

2B

3

2A

3

2

BE

3B

0

3A

0

3B

1

3A

1

3B

2

3A

2

3B

3

3A

3

3

BE

4B

0

4A

0

4B

1

4A

1

4B

2

4A

2

4B

3

4A

3

4

BE

1

BE 1

1B0

2

1B1

3

GND 4

1B2

5

1B3

6

V

CC

7

2B0

8

2B1

9

GND 10

2B2

11

2B3

12

3B0

13

3B1

14

GND 15

3B2

16

3B3

17

V

CC

18

4B0

19

4B1

20

GND 21

4B2

22

4B3

23

4

BE 24

2

BE48

1A0

47

1A1

46

GND45

1A2

44

1A3

43

V

CC

42

2A0

41

2A1

40

GND39

2A2

38

2A3

37

3A0

36

3A1

35

GND34

3A2

33

3A3

32

V

CC

31

4A0

30

4A1

29

GND28

4A2

27

4A3

26

3

BE25

48-Pin

A, V

PI3B16244

PI3B162244 (25

ΩΩ

ΩΩ

Ω)

3.3V, Hot Insertion, 16-Bit, 4-Port BusSwitch

2

PS8170B 11/06/98

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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 ±1 µA
IIL Input LOW Current VCC = Max., VIN = GND ±1 µA
IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1 µA
VIK Clamp Diode Voltage VCC = Min., IIN = –18mA –0.7 –1.2 V
RON Switch On Resistance

(3)

VCC = Min., VIN = 0.0V, 16244 5 8 Ω
ION = 48mA 162244 20 28 40
VCC = Min., VIN = 2.4V, 16244 10 15 Ω
ION = 15mA 162244 20 35 48

Capacitance (TA = 25°C, f = 1 MHz)

Parameters

(4)

Description Test Conditions Typ. Units

CIN Input Capacitance VIN = 0V 3.0
COFF A/B Capacitance, Switch Off VIN = 0V 8.5 pF
CON A/B Capacitance, Switch On VIN = 0V 17.0

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

Ambient Temperature with Power Applied ....................–40°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

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.)

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.

PI3B16244

PI3B162244 (25

ΩΩ

ΩΩ

Ω)

3.3V, Hot Insertion, 16-Bit, 4-Port BusSwitch

3

PS8170B 11/06/98

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Com.

Parameters Description Conditions

(1)

Min. Max. Units

t

PLH Propagation Delay

(2,3)

CL = 50pF 16244 0.25

t

PHL Ax to Bx, Bx to Ax RL = 500Ω 162244 1.25

t

PZH Bus Enable Time CL = 50pF 1 4.5 ns

t

PZL BE to Ax or Bx RL = 500Ω,

t

PHZ Bus Disable Time R = 500Ω 1 5.0

t

PLZ BE to Ax or Bx

Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

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

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
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.

PI3B16244 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