PI74FCT157TS [ETC]

2-Input Digital Multiplexer ; 2 ，输入数字多路复用器\n


型号：	PI74FCT157TS
厂家：	ETC
描述：	2-Input Digital Multiplexer 2 ，输入数字多路复用器\n 复用器逻辑集成电路光电二极管
文件：	总5页 (文件大小：184K)
中文：	中文翻译
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PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

Fast CMOS

Quad 2-Input Multiplexer

ProductFeatures:

Product Description:

PI74FCT157/257/2157/2257Tispincompatiblewithbipolar

FAST Series at a higher speed and lower power

consumption

25Ω series resistor on all outputs (FCT2XXX only)

TTL input and output levels

Low ground bounce outputs (25Ω series only)

Extremelylowstaticpower

Hysteresis on all inputs

Pericom Semiconductors PI74FCT series of logic circuits are pro-

duced in the Companys advanced 0.8 micron CMOS technology,

achievingindustryleadingspeedgrades.AllPI74FCT2XXXdevices

have a built-in 25-ohm series resistor on all outputs to reduce noise

because of reflections, thus eliminating the need for an external

terminating resistor.

The PI74FCT157T/257T and PI74FCT2157T/2257T are high-

speed quad 2-input multiplexers. The common select input can be

used to select four bits of data from two sources. The four buffered

outputs present the selected data in the true (non-inverting) form.

Industrial operating temperature range: 40°C to +85°C

Packagesavailable:

16-pin150milwideplasticQSOP(Q)

16-pin300milwideplasticSOIC(S)

16-pin150milwideplasticSOIC(W)

The PI74FCT157T/2157T has a common, active-LOW, Enable

input (E). When E is inactive, all four outputs are held LOW. The

PI74FCT157T/2157T can generate any four of the 16 different

funtions of two variables with one common variable. The

PI74FCT157T/2157T can be used as a function generator or to

move data from two different groups of registers to a common bus.

The PI74FCT257/2257T has a common Output Enable (OE) input.

When OE is HIGH, all outputs are switched to a high-impedance

state allowing the outputs to interface directly with bus-oriented

systems.

Logic Block Diagram

157

ONLY

3 OTHER MULTIPLEXERS

B-I

B-ZD

0B-I

257

ONLY

PS2010A 03/09/96

PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

Product Pin Description

Truth Table⁽¹⁾

Inputs

Outputs ZN

Pin Name

I0A-I0D

I1A-I1D

Description

E/OE

157/2157 257/2257

Source 0 Data Inputs

Source 1 Data Inputs

Enable Input (Active LOW) FCT157/2157

Output Enable (Active LOW) FCT257/2257

Select Input

Outputs

Ground

ZA-ZD

GND

VCC

NOTE:

Power

1. H = High Voltage Level

X = Don't Care

L = Low Voltage Level

Z = High Impedance

PI74FCT157/2157T Product Pin Configuration

I0A

I1A

I0B

I1B

16 Vcc

I0C

I1C

I0D

I1D

16-PIN

Q16

S16

W16

GND

PI74FCT257/2257T Product Pin Configuration

16 Vcc

15 OE

16-PIN

Q16

S16

W16

GND

PS2010A 03/09/96

PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

Maximum Ratings

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

Note:

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

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.

DCElectricalCharacteristics(OvertheOperatingRange, TA =40°Cto+85°C, VCC =5.0V±5%)

Parameters Description

TestConditions⁽¹⁾Min. Typ⁽²⁾Max. Units

OutputHIGHVoltage VCC =Min., VIN =VIH orVIL

VOH

VOL

VIH

VIL

IIH

IOH =15.0mA

2.4

3.0

0.3

Output LOW Current

InputHIGHVoltage

Input LOW Voltage

InputHIGHCurrent

Input LOW Current

HighImpedance

VCC =Min., VIN =VIH orVIL

GuaranteedLogicHIGHLevel

GuaranteedLogicLOWLevel

VCC =Max.

IOL = 48 mA

0.50

IOL =12mA(25ΩSeries)

2.0

0.8

VIN =VCC

µA

IIL

VCC =Max.

VIN=GND

VOUT=2.7V

VOUT =0.5V

IOZH

IOZL

VIK

IOFF

IOS

VCC =MAX.

Output Current

ClampDiodeVoltage

PowerDownDisable

ShortCircuitCurrent

Input Hysteresis

VCC =Min., IIN =18mA

VCC =GND,VOUT =4.5V

VCC =Max.⁽³⁾,VOUT = GND

0.7 1.2

100

µA

60 120

200

Capacitance (TA = 25°C, f = 1 MHz)

Parameters⁽⁴⁾

Description

Test Conditions

VIN = 0V

Typ

Max.

Units

CIN

Input Capacitance

Output Capacitance

COUT

VOUT = 0V

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, +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. This parameter is determined by device characterization but is not production tested.

PS2010A 03/09/96

PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

Power Supply Characteristics

Parameters Description

Test Conditions⁽¹⁾

Min. Typ⁽²⁾Max. Units

ICC

Quiescent Power

Supply Current

VCC = Max.

VIN = GND or VCC

0.1

500

µA

∆ICC

ICCD

Supply Current per

Input @ TTL HIGH

VCC = Max.

VIN = 3.4V⁽³⁾

0.5

2.5

Supply Current per

Input per MHz⁽⁴⁾

VCC = Max.,

Outputs Open

VIN = VCC

VIN = GND

0.15

0.25

mA/

MHz

E or OE = GND

One Bit Toggling

50% Duty Cycle

Total Power Supply

Current⁽⁶⁾

VCC = Max.,

Outputs Open

fI = 10 MHZ

50% Duty Cycle

E or OE = GND

One Bit Toggling

VIN = VCC

VIN = GND

1.5

1.8

3.5⁽⁵⁾

4.5⁽⁵⁾

VIN = 3.4V

VIN = GND

V^CC= Max.,

Outputs Open

fI = 2.5 MHZ

50% Duty Cycle

E or OE = GND

Four Bits Toggling

VIN = VCC

VIN = GND

1.5

2.5

3.5⁽⁵⁾

7.5⁽⁵⁾

VIN = 3.4V

VIN = GND

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 (V^IN= 3.4V); all other inputs at Vcc or GND.

4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.

5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.

6. I^C=IQUIESCENT + IINPUTS + IDYNAMIC

IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)

ICC = Quiescent Current

∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)

DH = Duty Cycle for TTL Inputs High

NT = Number of TTL Inputs at DH

ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)

fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)

fI = Input Frequency

NI = Number of Inputs at fI

All currents are in milliamps and all frequencies are in megahertz.

PS2010A 03/09/96

PI74FCT157T/257T

(25Ω Series)PI74FCT2157T/2257T

QUAD 2-INPUT MULTIPLEXER

PI74FCT157/2157T Switching Characteristics over Operating Range

157T/2157T 157AT/2157AT 157CT/2157CT

Com. Com. Com.

157DT

Com.

Parameters Description

Conditions⁽¹⁾

Min

Max

Min

Max

Min

Max

Min Max Unit

PLH

PHL

PLH

PHL

PLH

PHL

Propagation Delay

to Z

Propagation Delay

E to Z

Propagation Delay

S to Z

= 50 pF

= 500Ω

1.5

6.0

1.5

5.0

1.5

4.3

1.5

3.9

4.4

4.6

10.5

6.0

7.0

4.8

5.2

PI74FCT257/2257T Switching Characteristics over Operating Range

257T/2257T 257AT/2257AT 257CT/2257CT

Com. Com. Com.

Parameters Description

Conditions⁽¹⁾

Min

Max

Min

Max

Min

Max

Unit

PLH

PHL

PLH

PHL

PZH

PZL

PZH

PZL

Propagation Delay

to Z

Propagation Delay

S to Z

Output Enable Time

OE to Z

Output Disable Time

OE to Z

= 50 pF

= 500Ω

1.5

6.0

1.5

5.0

1.5

4.3

10.5

8.5

7.0

5.5

5.2

6.0

5.0

(3)

6.0

Notes:

1. See test circuit and wave forms.

2. Minimum limits are guaranteed but not tested on Propagation Delays.

3. This parameter guaranteed but not production tested.

Pericom Semiconductor Corporation

2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com

PS2010A 03/09/96

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