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Integrated Device Technology, Inc.

DESCRIPTION:

The FCT157T, FCT257T/FCT2257T are high-speed quad

2-input multiplexers built using an advanced dual metal CMOS

technology.  Four bits of data from two sources can be

selected using the common select input.  The four buffered

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

form.

The FCT157T has a common, active-LOW, enable input.

When the enable input is not active, all four outputs are held

LOW.  A common application of ‘FCT157T is to move data

from two different groups of registers to a common bus.

Another application is as a function generator.  The ‘FCT157T

can generate any four of the 16 different functions of two

variables with one variable common.

The FCT257T/FCT2257T have 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.

The FCT2257T has balanced output drive with current

limiting resistors.  This offers low ground bounce, minimal

undershoot and controlled output fall times-reducing the need

for external series terminating resistors.  FCT2xxxT parts are

plug-in replacements for FCTxxxT parts.

FAST CMOS

QUAD 2-INPUT

MULTIPLEXER

IDT54/74FCT157T/AT/CT/DT

IDT54/74FCT257T/AT/CT/DT

IDT54/74FCT2257T/AT/CT

MILITARY AND COMMERCIAL TEMPERATURE RANGES

JUNE 1996

1

©

1996 Integrated Device Technology, Inc.

     6.6

                    2537/6

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FEATURES:

• Common features:

Low input and output leakage 

1

µ

A (max.)

CMOS power levels

True TTL input and output compatibility

– V

OH

 = 3.3V (typ.)

– V

OL

 = 0.3V (typ.)

Meets or exceeds JEDEC standard 18 specifications

Product available in Radiation Tolerant and Radiation

Enhanced versions

Military product compliant to MIL-STD-883, Class B

and DESC listed (dual marked)

Available in DIP, SOIC, SSOP, QSOP, CERPACK

and LCC packages

• Features for FCT157T/257T:

Std., A, C and D speed grades

High drive outputs (-15mA I

OH

, 48mA I

OL

)

• Features for FCT2257T:

Std., A, and C speed grades

Resistor outputs

(-15mA I

OH

, 12mA I

OL

 Com.)

(-12mA I

OH

, 12mA I

OL

 Mil.)

Reduced system switching noise

E

157 Only

3 other multiplexers

OE

257 Only

Z

A

Z

B

–Z

D

S

I

1B

–I

1D

I

0B

–I

0D

I

1A

I

0A

2537 drw 01

2537 drw 02

2537 drw 03

FUNCTIONAL BLOCK DIAGRAM

PIN CONFIGURATIONS

LCC

TOP VIEW

4

5

6

7

8

L20-2

18

17

16

15

14

9 10 11 12 13

3

2

1

20 19

INDEX

GND

NC

Vcc

E or OE*

NC

NC

NC

S

I

0A

I

1A

Z

A

I

0B

I

1B

Z

B

Z

D

I

1D

I

0C

I

1C

Z

C

I

0D

DIP/SOIC/QSOP/CERPACK

TOP VIEW

5

6

7

8

S

I

0A

1

2

3

4

16

15

14

13

12

11

10

9

Vcc

P16-1,

D16-1,

SO16-1,

SO16-7

&

E16-1

I

1A

Z

A

I

0B

I

1B

GND

Z

E or OE*

I

0C

I

1C

Z

C

I

0D

I

Z

D

B

1D

*  

E

 for FCT157, 

OE

 for FCT257/FCT2257.

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6.6

2

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

PIN DESCRIPTION

Pin Names

Description

I

0A

–I

0D

Source 0 Data Inputs

I

1A

–I

1D

Source 1 Data Inputs

E

Enable Input (Active LOW)–FCT157T

OE

Output Enable (Active LOW)–FCT257T/2257T

S

Select Input

Z

A

–Z

D

Outputs

2537 tbl 01

FUNCTION TABLE

(1)

Inputs

Output Z

N

EE

/

OE

OE

S

I

0

I

1

157

257

H

X

X

X

L

Z

L

H

X

L

L

L

L

H

X

H

H

H

L

L

L

X

L

L

L

L

H

X

H

H

NOTE:

2537 tbl 02

1. H = HIGH Voltage Level

L = LOW Voltage Level

X = Don’t Care

Z = High Impedance

ABSOLUTE MAXIMUM RATINGS

(1)

CAPACITANCE 

(T

A

 = +25

°

C, f = 1.0MHz)

Symbol

Rating

Commercial

Military

Unit

V

TERM(2)

Terminal Voltage

with Respect to

GND

–0.5 to +7.0

–0.5 to +7.0

V

V

TERM(3)

Terminal Voltage

with Respect to

GND

–0.5 to

V

CC 

+0.5

–0.5 to

V

CC 

+0.5

V

T

A

Operating

Temperature

0 to +70

–55 to +125

°

C

T

BIAS

Temperature

Under Bias

–55 to +125

–65 to +135

°

C

T

STG

Storage

Temperature

–55 to +125

–65 to +150

°

C

P

T

Power Dissipation

0.5

0.5

W

I

OUT

DC Output

Current

–60 to +120    –60 to +120    mA

NOTES:

1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-

INGS 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.  No terminal voltage may exceed

V

CC

 by +0.5V unless otherwise noted.

2. Input and V

CC

 terminals only.

3. Outputs and I/O terminals only.

Symbol

Parameter

(1)

Conditions

Typ.

Max. Unit

C

IN

Input  

Capacitance

V

IN

  = 0V

6

10

pF

C

OUT

Output  

Capacitance

V

OUT 

= 0V

8

12

pF

NOTE:

1. This parameter is measured at characterization but not tested.

2537 lnk 03

2537 lnk 04

background image

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.6

3

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:

Commercial:  T

A

 = 0

°

C to +70

°

C, V

CC

 = 5.0V 

±

 5%; Military:  T

A

 = –55

°

C to +125

°

C, V

CC

 = 5.0V 

±

 10%

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

 

Unit

V

OH

Output HIGH Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OH

 = –6mA MIL.

I

OH

 = –8mA COM'L.  

2.4

3.3

V

I

OH

 = –12mA MIL.

I

OH

 = –15mA COM'L.

2.0

3.0

V

V

OL

Output LOW Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OL 

= 32mA MIL.

I

OL 

= 48mA COM'L.

0.3

0.50

V

I

OS

Short Circuit Current

V

CC

 = Max., V

O

 = GND

(3)

–60

–120

–225

mA

I

OFF

Input/Output Power Off Leakage

(5)

V

CC

 = 0V, V

IN

 or V

O

 

 4.5V

±

1

µ

A

OUTPUT DRIVE CHARACTERISITICS FOR FCT157/257T

2537 tbl 06

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

 

Unit

I

ODL

Output LOW Current

V

CC

 = 5V, V

IN 

= V

IH 

or

 

V

IL,  

V

OUT 

= 1.5V

(3)

16

48

mA

I

ODH

Output HIGH Current

V

CC

 = 5V, V

IN 

= V

IH 

or V

   IL,

V

OUT 

= 1.5V

(3)

–16

–48

mA

V

OH

Output HIGH Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or 

 

V

IL

I

OH

 = –12mA MIL.

I

OH

 = –15mA COM'L.

2.4

3.3

V

V

OL

Output LOW Voltage

V

CC

 = Min.

V

IN

 = V

IH 

or V

IL

I

OL

 = 12mA

0.3

0.50

V

OUTPUT DRIVE CHARACTERISTICS FOR FCT2257T

2537 lnk 07

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at Vcc = 5.0V, +25

°

C ambient.

3. Not more than one output should be shorted at one time.  Duration of the short circuit test should not exceed one second.

4. The test limit for this parameter is 

±

5

µ

A at T

A

 = –55

°

C.

5. This parameter is guaranteed but not tested.

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

Unit

V

IH

Input HIGH Level

Guaranteed Logic HIGH Level

2.0

V

V

IL

Input LOW Level

Guaranteed Logic LOW Level

0.8

V

I

I H

Input HIGH Current

(4)

V

CC

 = Max.

V

I

 = 2.7V

±

1

µ

A

I

I L

Input LOW Current

(4)

  

V

I

 = 0.5V

±

1

I

OZH

High Impedance Output Current

V

CC

 = Max.

V

= 2.7V

±

1

µ

A

I

OZL

(3-State Output pins)

(4)

V

O

 = 0.5V

±

1

I

 

Input HIGH Current

(4)

V

CC

 = Max., V

= V

CC 

(Max.)

±

1

µ

A

V

IK

Clamp Diode Voltage

V

CC

 = Min., I

IN  

= –18mA

–0.7

–1.2

V

V

H

Input Hysteresis

                                         —

200

mV

I

CC

Quiescent Power Supply Current

V

CC

 = Max., V

IN

 = GND or V

CC

0.01

1

mA

2537 lnk 05

background image

6.6

4

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

POWER SUPPLY CHARACTERISTICS

Symbol

Parameter

Test Conditions

(1)

Min.

Typ.

(2)

Max.

 

Unit

I

CC

Quiescent Power Supply Current

TTL Inputs HIGH

V

CC

 = Max.

V

IN

 = 3.4

(3)

0.5

2.0

mA

I

CCD

Dynamic Power Supply Current

(4)

V

CC

 = Max.

Outputs Open

E

 or 

OE

 = GND

V

IN

 = V

CC

V

IN

 = GND

FCTxxxT

0.15

0.25

mA/

MHz

One Bit Toggling

50% Duty Cycle

FCT2xxxT

0.06

0.12

I

C

Total Power Supply Current

(6)

V

CC

 = Max.

V

IN

 = V

CC

FCTxxxT

1.5

3.5

mA

Outputs Open

V

IN

 = GND

FCT2xxxT

0.6

2.2

f

O

 = 10MHz

50% Duty Cycle

V

IN

 = 3.4

FCTxxxT

1.8

4.5

E

 or 

OE

 = GND

One Bit Toggling

V

IN

 = GND

FCT2xxxT

0.9

3.2

V

CC

 = Max.

V

IN

 = V

CC

FCTxxxT

1.5

3.5

(5)

Outputs Open

V

IN

 = GND

FCT2xxxT

0.6

2.2

(5)

f

O

 = 2.5MHz

50% Duty Cycle

V

IN

 = 3.4

FCTxxxT

2.5

7.5

(5)

E

 or 

OE

 = GND

Four Bits Toggling

V

IN

 = GND

FCT2xxxT

1.6

6.2

(5)

NOTES:

1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device type.

2. Typical values are at V

CC

 = 5.0V, +25

°

C ambient.

3. Per TTL driven input (V

IN

 = 3.4V); all other inputs at V

CC

 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 I

CC

 formula.  These limits are guaranteed but not tested.

6. I

C

 = I

QUIESCENT

 + I

INPUTS 

+ I

DYNAMIC

I

C

 = I

CC

 + 

I

CC

 D

H

N

T

 + I

CCD

 (f

o

N

o

)

I

CC

 = Quiescent Current

I

CC

 = Power Supply Current for a TTL High Input (V

IN

 = 3.4V)

D

H

 = Duty Cycle for TTL Inputs High

N

= Number of TTL Inputs at D

H

I

CCD 

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

f

o

 = Output Frequency

N

o

 = Number of Outputs at f

o

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

2537 tbl 06

background image

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.6

5

SWITCHING CHARACTERISTICS OVER OPERATING RANGE - FCT157T

SWITCHING CHARACTERISTICS OVER OPERATING RANGE – FCT257/2257T

2537 tbl 07

2537 tbl 08

2537 tbl 09

NOTES:

2537 tbl 10

1. See test circuits and waveforms.

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

FCT257/2257T

FCT257/2257AT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay I

N

 to Z

N

C

L

 = 50pF

R

L

 = 500

1.5

6.0

1.5

7.0

1.5

5.0

1.5

5.8

ns

t

PLH

t

PHL

Propagation Delay S to Z

N

1.5

10.5

1.5

12.0

1.5

7.0

1.5

8.1

ns

t

PZH

t

PZL

Output Enable Time

1.5

8.5

1.5

10.0

1.5

7.0

1.5

8.0

ns

t

PHZ

t

PLZ

Output Disable Time

1.5

6.0

1.5

8.0

1.5

5.5

1.5

5.8

ns

FCT257/2257CT

FCT257DT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay I

N

 to Z

N

C

L

 = 50pF

R

L

 = 500

1.5

4.3

1.5

5.0

1.5

3.9

ns

t

PLH

t

PHL

Propagation Delay S to Z

N

1.5

5.2

1.5

6.0

1.5

4.4

ns

t

PZH

t

PZL

Output Enable Time

1.5

6.0

1.5

6.8

1.5

4.4

ns

t

PHZ

t

PLZ

Output Disable Time

1.5

5.0

1.5

5.3

1.5

4.4

ns

FCT157T

FCT157AT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay I

N

 to Z

N

C

L

 = 50pF

R

L

 = 500

1.5

6.0

1.5

7.0

1.5

5.0

1.5

5.8

ns

t

PLH

t

PHL

Propagation Delay 

to Z

N

1.5

10.5

1.5

12.0

1.5

6.0

1.5

7.4

ns

t

PLH

t

PHL

Propagation Delay S to Z

N

1.5

10.5

1.5

12.0

1.5

7.0

1.5

8.1

ns

FCT157CT

FCT157DT

Com'l.

Mil.

Com'l.

Mil.

Symbol

Parameter

Condition

(1)

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Min.

(2)

Max.

Unit

t

PLH

t

PHL

Propagation Delay I

N

 to Z

N

C

L

 = 50pF

R

L

 = 500

1.5

4.3

1.5

5.0

1.5

3.9

ns

t

PLH

t

PHL

Propagation Delay 

E

 to Z

N

1.5

4.8

1.5

5.9

1.5

4.4

ns

t

PLH

t

PHL

Propagation Delay S to Z

N

1.5

5.2

1.5

6.0

1.5

4.6

ns

background image

6.6

6

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT- 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

ENABLE AND DISABLE TIMES

PROPAGATION DELAY

SET-UP, HOLD AND RELEASE TIMES

PULSE WIDTH

SWITCH POSITION

Pulse

Generator

R

T

D.U.T.

V

CC

V

IN

C

L

V

OUT

50pF

500

500

7.0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

DATA

INPUT

TIMING 

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

t

SU

t

H

t

REM

t

SU

t

H

HIGH-LOW-HIGH

PULSE

LOW-HIGH-LOW

PULSE

t

W

1.5V

1.5V

SAME PHASE

INPUT TRANSITION

3V

1.5V

0V

1.5V

V

OH

t

PLH

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

3V

1.5V

0V

t

PLH

t

PHL

t

PHL

V

OL

CONTROL

INPUT

3V

1.5V

0V

3.5V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

CLOSED

SWITCH

OPEN

V

OL

0.3V

0.3V

t

PLZ

t

PZL

t

PZH

t

PHZ

3.5V

0V

1.5V

1.5V

ENABLE

DISABLE

V

OH

PRESET

CLEAR

CLOCK ENABLE

ETC.

Test

Switch

Disable Low

Enable Low

Closed

All Other Tests

Open

Open Drain

DEFINITIONS:

C

L

=

Load capacitance: includes jig and probe capacitance.

R

=

Termination resistance: should be equal to Z

OUT 

of the Pulse

Generator.

2537 drw 04

2537 drw 05

2537 drw 06

2537 drw 07

NOTES:

1. Diagram shown for input Control Enable-LOW and input Control Disable-

HIGH

2. Pulse Generator for All Pulses: Rate 

 1.0MHz; t

F

 

 2.5ns; t

R

 

 2.5ns

2537 drw 08

2537 lnk 11

background image

IDT54/74FCT157T/AT/CT/DT, IDT54/74FCT257T/AT/CT/DT - 2257T/AT/CT

FAST CMOS QUAD 2-INPUT MULTIPLEXER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.6

7

ORDERING INFORMATION

2537 drw 09

X

Package

X

Process

Blank

B

Commercial 

MIL-STD-883, Class B

P

D

SO

L

E

Q

Plastic DIP

CERDIP

Small Outline IC

Leadless Chip Carrier

CERPACK

Quarter-size Small Outline Package

157T

257T

157AT

257AT

157CT

257CT

157DT

257DT

Quad 2-Input Multiplexer

Quad 2-Input Multiplexer (3-state)

XXXX

Device

Type

–55

°

C to +125

°

C

0

°

C to +70

°

C

54

74

XX

Temperature

Range

FCT

IDT

High Drive

Balanced Drive

Blank

2

X

Family