Datasheet PI5C3244L, PI5C3244P, PI5C3244Q, PI5C3244S Datasheet (PERICOM)

PI5C3244

8-BIT, 2-PORT BUSSWITCH

140

PS7014A 03/13/96

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

Product Description:

Pericom Semiconductor’s PI5C series of logic circuits are pro­duced in the Company’s advanced 0.8 micron CMOS technology,
achieving industry leading performance.

The PI5C3244 features a set of eight bus switches which is pinout
and function compatible with the PI74FCT244T, 74F244, and
74ALS/AS/LS 244 8-bit drivers. Two enable signals (BEn) turn the
switches on similar to the enable signals of the 244. The bus switch
creates no additional propagation delay or ground bounce noise.

BE1 BE2 1A, 1B 2A, 2B

H H Disconnect Disconnect
L H 1A = 1 B Disconnect
H L Disconnect 2A = 2B
L L 1A = 1B 2A = 2B

Truth Table

(1)

Logic Block Diagram

Product Pin Description

Pin Name Description

BEn Bus Output Enable (Active LOW)
A0-A3 Bus A
B0-B3 Bus B
GND Ground
VCC Power

Product Pin Configuration

PI5C3244

8-Bit, 2-Port BusSwitch

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

Product Features:

• Near zero propagation delay

•5Ωswitches connect inputs to outputs when enabled

• Direct bus connection when switches are ON

• Ultra Low Quiescent Power (0.2µA Typical)
– Ideally suited for notebook applications

• Pin compatible with 74 Series 244 logic devices

• Packages available:
– 20-pin 173 mil wide plastic TSSOP (L)
– 20-pin 300 mil wide plastic DIP (P)
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 300 +mil wide plastic SOIC (S)

Note: 1. H = High Voltage Level

L = Low Voltage Level

1B

0

1A

0

1B

1

1A

1

1B

2

1A

2

1B

3

1A

3

BE

1

2B

0

2A

0

2B

1

2A

1

2B

2

2A

2

2B

3

2A

3

BE

2

V

CC

BE

1

120

BE

2

219

1B0

1

A

0

318

2A3

2

B

3

417

1B1

1

A

1

516

2A2

2

B

2

615

1B2

1

A

2

714

2A1

2

B

1

813

1B3

1

A

3

912

2A0

2

B

0

10 11

GND

20-PIN

L20
P20
Q20
S20

PI5C3244

8-BIT, 2-PORT BUSSWITCH

141

PS7014A 03/13/96

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

1
2

3

4
5

6

7
8
9
10
11
12
13
14
15

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 ±5%)

Parameters Description Test Conditions

(1)

Min. Ty p

(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 µ A
IOZH High Impedance Output Current 0 ≤ A, B ≤ VCC ±1 µA
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 m A
VH Input Hysteresis at Control Pins 15 0 mV
RON Switch On Resistance

(4)

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

VCC = Min., VIN = 2.4V, ION = 15 mA 10 15

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.

PI5C3244

8-BIT, 2-PORT BUSSWITCH

142

PS7014A 03/13/96

12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012

Power Supply Characteristics

Parameters Description Test Conditions

(1)

Min. Typ

(2)

Ma x. 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
BE1 or BE2 = GND
Control Input Toggling
50% Duty Cycle

Notes:

1 . For conditions shown as Max. or Min., 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

PI5C3244

Com.

Parameters Description Conditions

(1)

Min Max Unit

t

PLH

Propagation Delay

(2,3)

CL = 50 pF 0.25 ns

t

PHL

Ax to Bx RL = 500

Ω

t

PZH

Bus Enable Time 1.5 5.6 ns

t

PZL

BEX to Ax or Bx

t

PHZ

Bus Disable Time 1.5 5.2 ns

t

PLZ

BEX to Ax or Bx

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.

Pericom Semiconductor Corporation

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