Datasheet PI5C16244V, PI5C16244A, PI5C16244B, PI5C162244A, PI5C162244B Datasheet (PERICOM)

PI5C16244/162244

16-BIT BUS SWITCH BUFFER

122

PS7024B 09/17/96

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Product Features:

• Near-zero propagation delay

•5Ω switches connect inputs to outputs when enabled

• Direct bus connection when switches are ON

• Ultra-low quiescent power (0.2 µA typical)
– Ideally suited for notebook applications

• Pin compatible with 74 series16244

• 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)
– 48-pin 150 mil wide plastic BQSOP (B)

Product Description:

Pericom Semiconductor’s PI5C series of logic circuits are pro­duced in the Company’s advanced 0.6 micron CMOS technology.

The PI5C16244 and PI5C162244 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 switch creates no additional propagation
delay or ground bounce noise.

The PI5C162244 device has a built-in 25-ohm series resistor to
reduce noise because of reflections, thus eliminating the need for an
external terminating resistor.

PI5C16244

PI5C162244 (25

ΩΩ

ΩΩ

Ω)

16-Bit 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

1B01A0

1B11A1

1B21A2

1B31A3

1BE

2B02A0

2B12A1

2B22A2

2B32A3

2BE

3B03A0

3B13A1

3B23A2

3B33A3

3BE

4B04A0

4B14A1

4B24A2

4B34A3

4BE

1BE 1

1B0 2
1B1 3

GND 4

1B2 5
1B3 6

VCC 7

2B0 8
2B1 9

GND 10

2B2 11
2B3 12
3B0 13
3B1 14

GND 15

3B2 16
3B3 17

VCC 18

4B0 19
4B1 20

GND 21

4B2 22
4B3 23

4BE 24

2BE48
1A047
1A146

GND45

1A244
1A343

VCC42

2A041
2A140

GND39

2A238
2A337
3A036
3A135

GND34

3A233
3A332

VCC31

4A030
4A129

GND28

4A227
4A326
3BE25

48-PIN

A,V,B

PI5C16244/162244

16-BIT BUS SWITCH BUFFER

123

PS7024B 09/17/96

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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, TA = –40°C to +85°C, VCC = 5V ±10%)

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 = –18 mA — –0.7 –1.2 V
IOS Short Circuit Current

(3)

A (B) = 0V, B (A) = VCC 100 — — mA
VH Input Hysteresis at Control Pins — 150 — mV
RON Switch On Resistance

(4)

VCC = Min., VIN = 0.0V, 16244 — 5 7 Ω

ION = 48 mA 162244 20 28 40

VCC = Min., VIN = 2.4V, 16244 — 10 15 Ω

ION = 15 mA 162244 20 35 48

Capacitance (TA = 25°C, f = 1 MHz)

Parameters

(5)

Description Test Conditions Typ. Max. Units

CIN Input Capacitance VIN = 0V — 6 pF
COFF A/B Capacitance, Switch Off VIN = 0V — 6 pF

CON 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.

PI5C16244/162244

16-BIT BUS SWITCH BUFFER

124

PS7024B 09/17/96

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Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Max. Units

ICC Quiescent Power VCC = Max. VIN = GND or VCC — 0.1 3.0 µA

Supply Current

∆ICC Supply Current per VCC = Max. VIN = 3.4V

(3)

— — 2.5 mA

Input @ TTL HIGH

ICCD Supply Current per VCC = Max., — — 0.25 mA/

Input per MHz

(4)

A and B Pins Open MHz
nBE = 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.

PI5C16244 Switching Characteristics over Operating Range

PI5C16244

Com.

Parameters Description Conditions

(1)

Min Max Unit

t

PLH

Propagation Delay

(2,3)

CL = 50 pF — 0.25 ns

t

PHL

xAx to xBx RL = 500Ω

t

PZH

Bus Enable Time 1.5 5. 6 ns

t

PZL X

BE to xAx or xBx

t

PHZ

Bus Disable Time 1.5 5. 2 ns

t

PLZ X

BE to xAx or xBx

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 0.25 ns for 50 pF 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.

PI5C162244 Switching Characteristics over Operating Range

PI5C162244

Com.

Parameters Description Conditions

(1)

Min Max Unit

t

PLH

Propagation Delay

(2,3)

CL = 50 pF — 1.25 ns

t

PHL

xAx to xBx RL = 500Ω

t

PZH

Bus Enable Time 1.5 5. 6 ns

t

PZL X

BE to xAx or xBx

t

PHZ

Bus Disable Time 1.5 5. 2 ns

t

PLZ X

BE to xAx or xBx

Pericom Semiconductor Corporation

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