IDT IDT54FCT157T, IDT54FCT157AT, IDT54FCT157CT, IDT54FCT157DT, IDT54FCT257T User Manual

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FAST CMOS
QUAD 2-INPUT
MULTIPLEXER

Integrated Device Technology, Inc.

FEATURES:

• Common features:

– Low input and output leakage ≤1µA (max.)
– CMOS power levels
– True TTL input and output compatibility

– VOH = 3.3V (typ.)

– VOL = 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 IOH, 48mA IOL)

• Features for FCT2257T:

– Std., A, and C speed grades
– Resistor outputs (-15mA I

(-12mA IOH, 12mA IOL Mil.)

– Reduced system switching noise

OH, 12mA IOL Com.)

IDT54/74FCT157T/AT/CT/DT
IDT54/74FCT257T/AT/CT/DT

IDT54/74FCT2257T/AT/CT

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.

FUNCTIONAL BLOCK DIAGRAM

S

157 Only

1B–I1D

I

I0B–I

E

3 other multiplexers

0D

1A

I

0A

I

OE257 Only

Z B–Z D

A

Z

2537 drw 01

PIN CONFIGURATIONS

1

S
I
I

GND

2

0A
1A

Z

A

I

0B

I

1B

B

Z

3
4
5
6
7
8

P16-1,
D16-1,

SO16-1,

SO16-7

E16-1

DIP/SOIC/QSOP/CERPACK

TOP VIEW

INDEX

1A

I

ZA

NC NC

I0B
I1B

0A

I

32

4
5
6
7
8

10 11 12 13

9

ZB

LCC

&

NC

S

1

L20-2

NC

GND

Vcc

20 19

ZDI

16
15
14
13
12
11
10

9

E or OE*

18
17
16
15
14

1D

Vcc

E or OE*

I

0C

I

1C

Z

C

I

0D

I

1D

D

Z

I0C
I

1C

ZC
I

0D

2537 drw 02

2537 drw 03

TOP VIEW

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

* E for FCT157, OE for FCT257/FCT2257.

MILITARY AND COMMERCIAL TEMPERATURE RANGES JUNE 1996

1996 Integrated Device Technology, Inc. 6.6 2537/6

1

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

0A–I0D Source 0 Data Inputs

I

1A–I1D Source 1 Data Inputs

I

E
OE

S Select Input

A–ZD Outputs

Z

ABSOLUTE MAXIMUM RATINGS

Symbol Rating Commercial Military Unit

(2)

VTERM

(3)

VTERM

TA Operating

TBIAS Temperature

TSTG Storage

PT Power Dissipation 0.5 0.5 W
IOUT DC Output

NOTES:

1. Stresses greater than those listed under ABSOLUTE 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. No terminal voltage may exceed
V

CC by +0.5V unless otherwise noted.

2. Input and V

3. Outputs and I/O terminals only.

Enable Input (Active LOW)–FCT157T
Output Enable (Active LOW)–FCT257T/2257T

(1)

Terminal Voltage

–0.5 to +7.0 –0.5 to +7.0 V
with Respect to
GND

Terminal Voltage
with Respect to
GND

–0.5 to

CC +0.5

V

–0.5 to

VCC +0.5

0 to +70 –55 to +125 °C

Temperature

–55 to +125 –65 to +135 °C
Under Bias

–55 to +125 –65 to +150 °C
Temperature

–60 to +120 –60 to +120 mA
Current

CC terminals only.

2537 tbl 01

V

2537 lnk 03

FUNCTION TABLE

(1)

Inputs Output ZN

EE/

OE

OE

SI0 I1 157 257

HXXX L Z

LHXL L L
LHXH H H
LLLX L L
LLHX H H

NOTE: 2537 tbl 02

1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance

CAPACITANCE (TA = +25°C, f = 1.0MHz)

Symbol Parameter

C

IN

Input
Capacitance

C

OUT

Output
Capacitance

NOTE:

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

(1)

Conditions Typ. Max. Unit

VIN = 0V 6 10

V

OUT

= 0V 8 12

pF

pF

2537 lnk 04

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

DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE

Following Conditions Apply Unless Otherwise Specified:
Commercial: TA = 0°C to +70°C, VCC = 5.0V ± 5%; Military: TA = –55°C to +125°C, VCC = 5.0V ± 10%

Symbol Parameter Test Conditions

V

IH

V

IL

I

I H

I

I L

I

OZH

I

OZL

II Input HIGH Current
V

IK

V

H

I

CC

Input HIGH Level Guaranteed Logic HIGH Level 2.0 — — V
Input LOW Level Guaranteed Logic LOW Level — — 0.8 V
Input HIGH Current
Input LOW Current

(4)

(4)

VI = 0.5V — —

VCC = Max. VI = 2.7V — —

High Impedance Output Current VCC = Max. VO = 2.7V — —

(4)

(4)

VCC = Max., VI = V

—

CC

(Max.) — —

IN

= –18mA — –0.7 –1.2 V

(3-State Output pins)

Clamp Diode Voltage VCC = Min., I
Input Hysteresis
Quiescent Power Supply Current VCC = Max., VIN = GND or V

OUTPUT DRIVE CHARACTERISITICS FOR FCT157/257T

Symbol Parameter Test Conditions

V

V

I

OS

I

OFF

OH

OL

Output HIGH Voltage VCC = Min.

IN

= V

IH

or V

V

IL

Output LOW Voltage VCC = Min.

IN

= V

IH

or V

V

IL

Short Circuit Current VCC = Max., VO = GND
Input/Output Power Off Leakage

(5)

VCC = 0V, VIN or VO ≤ 4.5V — —

(3)

(1)

Min. Typ.

VO = 0.5V — —

— 200 — mV

CC

(1)

IOH = –6mA MIL.

OH

= –8mA COM'L.

I
IOH = –12mA MIL.

OH

= –15mA COM'L.

I
I

OL

= 32mA MIL.

OL

= 48mA COM'L.

I

— 0.01 1 mA

Min. Typ.

2.4 3.3 — V

2.0 3.0 — V

— 0.3 0.50 V

–60 –120 –225 mA

(2)

Max. Unit

±
±
±
±
±

(2)

Max. Unit

±

1
1
1
1
1

1

µ

A

µ

A

µ

A

2537 lnk 05

µ

A

2537 tbl 06

OUTPUT DRIVE CHARACTERISTICS FOR FCT2257T

Symbol Parameter Test Conditions

I

ODL

I

ODH

V

OH

V

OL

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 ±5µA at T

5. This parameter is guaranteed but not tested.

Output LOW Current VCC = 5V, V
Output HIGH Current VCC = 5V, V
Output HIGH Voltage VCC = Min.

IN

= V

IH

V

or V

Output LOW Voltage VCC = Min.

IN

= V

IH

V

A = –55°C.

or V

IN

= V

IH or VIL, VOUT

IN

= V

IH

IL

IL

or V

IL,VOUT

(1)

(3)

= 1.5V

(3)

= 1.5V

IOH = –12mA MIL.

OH

= –15mA COM'L.

I

Min. Typ.

16 48 — mA

–16 –48 — mA

2.4 3.3 — V

IOL = 12mA — 0.3 0.50 V

(2)

Max. Unit

2537 lnk 07

6.6 3