Datasheet CY74FCT257TQCT, CY74FCT257TQC, CY74FCT257CTSOCT, CY74FCT257CTSOC, CY74FCT257CTQCT Datasheet (Texas Instruments)

Quad 2-Input Multiplexe

r

CY74FCT257T

SCCS019 - May 1994 - Revised February 2000

Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.

Copyright © 2000, Texas Instruments Incorporated

Features

• Function, pinout, and drive compatible with FCT and

F logic

• FCT-C speed at 4.3 ns max.

FCT-A speed at 5.0 ns max.

• Reduced V

OH

(typically = 3.3V) versions of equivalent

FCT functions

• Edge-rate control circuitry for significantly improved

noise characteristics

• Power-off disable feature

• Matched rise and fall times

• Fully compatible with TTL input and output logic levels

• ESD > 2000V

• Extended commercial range of −40˚C to +85˚C

• Sink current 64 mA
Source current 32 mA

Functional Description

The FCT257T has four identical two-input multiplexers which
select four bits of data from two sources under the control of a
commondataSelectinput(S).The I

0

inputsareselectedwhen

the Select input is LOW and the I

1

inputs are selected when
the Select input is HIGH. Data appears at the output in true
non-inverted form for the FCT257T.

The FCT257T is a logic implementation of a four-pole, two
position switch where the position of the switch is determined
by the logic levels supplied to the select input. Outputs are
forced to a high-impedance “OFF” state when the Output
Enable input (

OE) is HIGH.

All but one device must be in the high-impedance state to
avoid currents exceeding the maximum ratings if outputs are
tiedtogether.Design of theOutputEnablesignals must ensure
that there is no overlap when outputs of three-state devices
are tied together.

The outputs are designed with a power-off disable feature to
allow for liv e insertion of boards.

Logic Block Diagram Pin Configurations

I

0a

SI

1a

I

0b

I

1b

I

0c

I

1c

I

0dI1d

Y

a

Y

b

Y

c

Y

d

OE

1
2
3
4
5
6
7
8

V

CC

GND

Top View

SOIC/QSOP

16
15
14
13
12
11

10

9

Y

a

S

I

1a

I

0a

I

1c

I

0c

OE

Y

b

I

1b

I

0b

I

1d

I

0d

Y

c

Y

d

Y

a

S

I

1a

I

0a

I1dI

0d

Y

b

I1bI

0b

I1cI

0c

Y

c

Y

d

OE

LogicSymbol

Pin Description

Name Description

I Data Inputs
S Common Select Input
OE Enable Inputs (Active LOW)
Y Data Outputs

Function Table

[1]

Inputs Outputs

OE S I

0

I

1

Y

H

L
L
L
L

X
H
H
L
L

X
X
X
L
H

X

L
H
X
X

H
L
H
L
H

Note:

1. H = HIGH Voltage Level, L = LOW Voltage Level, X = Don’t Care,
Z = High impedance (OFF) state.

CY74FCT257T

2

Maximum Ratings

[2,3]

(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..................................................−65°C to +135°C

Supply Voltage to Ground Potential..................−0.5V to +7.0V

DC Input Voltage .................................................−0.5V to +7.0V

DC Output Voltage ..............................................−0.5V to +7.0V

DC Output Current (Maximum Sink Current/Pin) ......120 mA

Power Dissipation..........................................................0.5W

Static Discharge Voltage............................................>2001V

(per MIL-STD-883, Method 3015)

Operating Range

Range Range

Ambient

Temperature V

CC

Commercial All −40°C to +85°C 5V ± 5%

Electrical Characteristics Over the Operating Range

Parameter Description Test Conditions Min. Typ.

[4]

Max. Unit

V

OH

Output HIGH Voltage VCC=Min., IOH=−32 mA 2.0 V

V

OL

Output LOW Voltage VCC=Min., IOL=64 mA 0.3 0.55 V

V

IH

Input HIGH Voltage 2.0 V

V

IL

Input LOW Voltage 0.8 V

V

H

Hysteresis

[5]

All inputs 0.2 V

V

IK

Input Clamp Diode Voltage VCC=Min., IIN=−18 mA −0.7 −1.2 V

I

I

Input HIGH Current VCC=Max., VIN=V

CC

5 µA

I

IH

Input HIGH Current VCC=Max., VIN=2.7V ±1 µA

I

IL

Input LOW Current VCC=Max., VIN=0.5V ±1 µA

I

OZH

Off State HIGH-Level Output Current VCC= Max., V

OUT

= 2.7V 10 µA

I

OZL

Off State LOW-Level
Output Current

VCC = Max., V

OUT

= 0.5V −10 µA

I

OS

Output Short Circuit Current

[6]

VCC=Max., V

OUT

=0.0V −60 −120 −225 mA

I

OFF

Power-Off Disable VCC=0V, V

OUT

=4.5V ±1 µA

Capacitance

[5]

Parameter Description Typ.

[4]

Max. Unit

C

IN

Input Capacitance 5 10 pF

C

OUT

Output Capacitance 9 12 pF

Notes:

2. Unless otherwise noted, these limits are over the operating free-air temperature range.

3. Unused inputs must always be connected to an appropriate logic voltage level, preferably either V

CC

or ground.

4. Typical values are at V

CC

=5.0V, TA=+25˚C ambient.

5. This parameter is specified but not tested.

6. Not morethanone output should beshorted ata time. Duration ofshort should notexceed one second. Theuse of high-speed test apparatusand/or sample
and holdtechniques are preferableinorder to minimize internalchipheating and more accuratelyreflect operational values.Otherwise prolonged shorting of
a high output mayraise the chip temperature well above normal and therebycauseinvalid readings in other parametric tests. In anysequence of parameter
tests, I

OS

tests should be performed last.

CY74FCT257T

3

Document #: 38−00289−B

Power Supply Characteristics

Parameter Description Test Conditions Typ.

[4]

Max. Unit

I

CC

Quiescent Power Supply Current VCC=Max., VIN≤0.2V, VIN≥VCC−0.2V 0.1 0.2 mA

∆I

CC

Quiescent Power Supply Current
(TTL inputs HIGH)

VCC=Max., VIN=3.4V, f1=0, Outputs Open

[7]

0.5 2.0 mA

I

CCD

Dynamic Power Supply Current

[8]

VCC=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
OE=GND, VIN≤0.2V or VIN≥VCC−0.2V

0.06 0.12 mA/MHz

I

C

Total Power Supply Current

[9]

VCC=Max., 50% Duty Cycle, Outputs Open,
One Inputt Toggling at f

1

=10 MHz,

OE=GND, VIN≤0.2V or VIN≥VCC−0.2V

0.7 1.4 mA

VCC=Max.,50% Duty Cycle, Outputs Open,
One Input Toggling at f

1

=10 MHz,

OE=GND, VIN=3.4V or VIN=GND

1.0 2.4 mA

VCC=Max., 50% Duty Cycle, Outputs Open,
Four Bits Toggling at f

1

=2.5 MHz,

OE=GND, VIN≤0.2V or VIN≥VCC−0.2V

0.7 1.4

[10]

mA

VCC=Max., 50% Duty Cycle, Outputs Open,
Four Bits Toggling at f

1

=2.5 MHz,

OE=GND, VIN=3.4V or VIN=GND

1.7 5.4

[10]

mA

Switching Characteristics Over the Operating Range

Parameter Description

CY74FCT257T CY74FCT257AT CY74FCT257CT

Unit Fig. No.

[12]

Min.

[11]

Max. Min.

[11]

Max. Min.

[11]

Max.

t

PLH

t

PHL

Propagation Delay I to Y 1.5 6.0 1.5 5.0 1.5 4.3 ns 1, 3

t

PLH

t

PHL

Propagation Delay S to O 1.5 10.5 1.5 7.0 1.5 5.2 ns 1, 3

t

PZH

t

PZL

Output Enable Time 1.5 8.5 1.5 7.0 1.5 6.0 ns 1, 7, 8

t

PHZ

t

PLZ

Output Disable Time 1.5 6.0 1.5 5.5 1.5 5.0 ns 1, 7, 8

Ordering Information

Speed

(ns) Ordering Code

Package

Name Package Type

Operating

Range

4.3 CY74FCT257CTQCT Q1 16-Lead (150-Mil) QSOP Commercial
CY74FCT257CTSOC/SOCT S1 16-Lead (300-Mil) Molded SOIC

5.0 CY74FCT257ATQCT Q1 16-Lead (150-Mil) QSOP Commercial

6.0 CY74FCT257TQCT Q1 16-Lead (150-Mil) QSOP Commercial

Notes:

7. Per TTL driven input (V

IN

=3.4V); all other inputs at VCC or GND.

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

9. I

C

=I

QUIESCENT

+ I

INPUTS

+ I

DYNAMIC

IC=ICC+∆ICCDHNT+I

CCD(f0

/2 + f1N1)

I

CC

= Quiescent Current with CMOS input levels

∆I

CC

= Power Supply Current for a TTL HIGH input (VIN=3.4V)

D

H

= Duty Cycle for TTL inputs HIGH

N

T

= Number of TTL inputs at D

H

I

CCD

= Dynamic Current caused by an input transition pair (HLH or LHL)

f

0

= Clock frequency for registered devices, otherwise zero

f

1

= Input signal frequency

N

1

= Number of inputs changing at f

1

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

10. Values for these conditions are examples of the ICC formula. These limits are specified but not tested.

11. Minimum limits are specified but not tested on Propagation Delays.

12. See “Parameter Measurement Information” in the General Information section.

CY74FCT257T

4

Package Diagrams

16-Lead Quarter Size Outline Q1

16-Lead Molded SOIC

S1

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