Datasheet 74lvc257a DATASHEETS (Philips)

INTEGRATED CIRCUITS

74LVC257A

Quad 2-input multiplexer with 5 Volt
tolerant inputs/outputs (3-State)

Product specification
Superceded data of 1997 Sep 26
IC24 Data Handbook

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1998 Jul 29

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

FEA TURES

•Wide supply voltage range of 1.2 to 3.6 V

•In accordance with JEDEC standard no. 8-1A

•CMOS lower power consumption

•Direct interface with TTL levels

•Output drive capability 50  transmission lines at 85°C

•5 Volt tolerant inputs/outputs, for interfacing with 5 Volt logic

QUICK REFERENCE DATA

GND = 0 V; T

= 25°C; tr =t

amb

SYMBOL

Propagation delay

t

PHL/tPLH

C

I

C

PD

nl0, nl1 to nY
S to nY

Input capacitance 5.0 pF
Power dissipation capacitance per channel VI = GND to V

NOTE:

is used to determine the dynamic power dissipation (PD in µW)

1. C

PD

P

= CPD × V

D

2

× fi  (CL × V

CC

fi = input frequency in MHz; CL = output load capacitance in pF;

= output frequency in MHz; VCC = supply voltage in V;

f

o

 (C

L

2

× V

× fo) = sum of the outputs.

CC

≤ 2.5 ns

f

PARAMETER CONDITIONS TYPICAL UNIT

2

× fo) where:

CC

CL = 50 pF;
VCC = 3.3 V

DESCRIPTION

The 74LVC257A is a high-performance, low-power, low-voltage,
Si-gate CMOS device and superior to most advanced CMOS
compatible TTL families.

Inputs can be driven from either 3.3V or 5.0V devices. In 3-State
operation, outputs can handle 5V. This feature allows the use of
these devices as translators in a mixed 3.3V/5V environment.

The 74LVC257A is a quad 2-input multiplexer with 3-state outputs,
which select 4 bits of data from two sources and are controlled by a
common data select input (S). The data inputs from source 0 (1l
4l

) are selected when input S is LOW and the data inputs from

0

source 1 (1l
outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.
The 74LVC257A is the logic implementation of a 4-pole, 2-position
switch, where the position of the switch is determined by the logic
levels applied to S. The outputs are forced to a high impedance
OFF-state when OE

1

CC

74L VC257A

to

0

to 4l1) are selected when S in HIGH. Data appears at the

1

is HIGH.

3.9

3.5

30 pF

ns

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #

16-Pin Plastic SO –40°C to +85°C 74LVC257A D 74LVC257A D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +85°C 74LVC257A DB 74LVC257A DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +85°C 74LVC257A PW 74LVC257APW DH SOT403-1

PIN CONFIGURATION

1

S

2

1I

0

3

1I

1

4

IY

5

2l

0

6

2l

1

7

2Y

8

GND

1998 Jul 29 853-2101 19802

16

15

14

13

12

11

10

9

SV00636

V

OE

4l

4l

4Y

3l

3l

3Y

CC

0

1

0

1

LOGIC SYMBOL

2

2

35

6

10

1411

13

1I

2I

3I

11I2I

0

0

1

1
15

S
OE

1Y

2Y

4

7

4I

3I

0

3Y

9

4I

0

1

1

4Y

12

SV00637

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

PIN DESCRIPTION

PIN

NUMBER

1 S Common data select input
2, 5, 11, 14 1l0 to 4l0Data inputs from source 0
3, 6, 10, 13 1l1 to 4l1Data outputs from source 1
4, 7, 9, 12 1Y to 4Y 3-State multiplexer outputs
8 GND Ground (0 V)

15 OE
16 V

LOGIC SYMBOL (IEEE/IEC)

SYMBOL FUNCTION

3-State output enable input (active
LOW)

CC

1

15

2

3

5

6

11

10

14

13

Positive supply voltage

G1

EN

MUX

1

1

SV00638

4

7

9

12

74LVC257A

FUNCTION TABLE

INPUTS OUTPUTS

OE S nl

0

H X X X Z

L H X L L
L H X H H
L L L X L
L L H X H

NOTES:

H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state

LOGIC DIAGRAM

1I

1

1I0

2I

1

2I

0

3I

1

3I

0

4I

1

4I

0

OE

nl

1

nY

1Y

2Y

3Y

4Y

FUNCTIONAL DIAGRAM

2

1I

0

3

1I

1

5

2I

0

6

2I

1

11
10

14
13

1998 Jul 29

3I
3I

4I
4I

SELECTOR

0
1

0

1

S

115

3–STATE

MULTIPLEXER

OUTPUTS

OE

1Y

2Y

3Y

4Y

SV00639

S

SV00640

4

7

9

12

3

Philips Semiconductors Product specification

SYMBOL

PARAMETER

CONDITIONS

UNIT

V

V

V

V

V

V

mW

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

RECOMMENDED OPERATING CONDITIONS

MIN MAX

DC supply voltage (for max. speed performance) 2.7 3.6

CC

DC supply voltage (for low-voltage applications) 1.2 3.6

V

T

amb

tr, t

ABSOLUTE MAXIMUM RATINGS

In accordance with the Absolute Maximum Rating System (IEC 134); Voltages are referenced to GND (ground = 0V)

SYMBOL

V

CC

I

IK

V

I

OK

I

I

GND

T

stg

P

TOT

NOTES:

1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability .

2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

DC input voltage range 0 5.5 V

I

DC input voltage range; output HIGH or LOW state 0 V

O

DC output voltage range; output 3-State 0 5.5
Operating free-air temperature range –40 +85 °C

Input rise and fall times

f

VCC = 1.2 to 2.7V
VCC = 2.7 to 3.6V

0
0

1

PARAMETER CONDITIONS RATING UNIT

DC supply voltage –0.5 to +6.5 V
DC input diode current VIt 0 –50 mA
DC input voltage Note 2 –0.5 to +5.5 V

I

DC output diode current V

uVCC or VO t 0

O

DC output voltage; output HIGH or LOW Note 2 –0.5 to VCC +0.5

O

DC output voltage; output 3-State Note 2 –0.5 to 6.5
DC output source or sink current VO = 0 to V

O

, I

DC VCC or GND current

CC

CC

Storage temperature range –65 to +150 °C
Power dissipation per package

– plastic mini-pack (SO) above +70°C derate linearly with 8 mW/K 500
– plastic shrink mini-pack (SSOP and TSSOP) above +60°C derate linearly with 5.5 mW/K 500

74LVC257A

LIMITS

CC

20
10

"50

"50

"100

ns/V

mA

mA
mA

1998 Jul 29

4

Philips Semiconductors Product specification

VIHHIGH level Input voltage

V

VILLOW level Input voltage

V

VOHHIGH level output voltage

V

IIInput leakage current

V

V

GND

"0.1

"5

A

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

DC ELECTRICAL CHARACTERISTICS

Over recommended operating conditions voltages are referenced to GND (ground = 0V)

SYMBOL PARAMETER TEST CONDITIONS Temp = -40°C to +85°C UNIT

MIN TYP1MAX

V

LOW level output voltage

OL

p

I

∆I

I

OZ

OFF

I

CC

3-State output OFF-state current VCC = 3.6V; VI = VIH or VIL; VO = VCC or GND 0.1
Power off leakage current VCC = 0.0V; VI or VO = 5.5V 0.1
Quiescent supply current VCC = 3.6V; VI = VCC or GND; IO = 0 0.1 10 µA
Additional quiescent supply current per

CC

input pin

NOTES:

1. All typical values are at V

p

p

p

= 3.3V and T

CC

amb

= 25°C.

VCC = 1.2V V
VCC = 2.7 to 3.6V 2.0
VCC = 1.2V GND
VCC = 2.7 to 3.6V 0.8
VCC = 2.7V; VI = VIH or VIL; IO = –12mA VCC*0.5
VCC = 3.0V; VI = VIH or VIL; IO = –100µA VCC*0.2 V
VCC = 3.0V; VI = VIH or V
VCC = 3.0V; VI = VIH or V

IO = –18mA VCC*0.6

IL;

IO = –24mA VCC*0.8

IL;

VCC = 2.7V; VI = VIH or VIL; IO = 12mA 0.40
VCC = 3.0V; VI = VIH or VIL; IO = 100µA GND 0.20
VCC = 3.0V; VI = VIH or V

;

= 3.6V;

CC

= 5.5V or

I

IO = 24mA 0.55

IL;

VCC = 2.7V to 3.6V; VI = VCC –0.6V; IO = 0 5 500 µA

CC

74LVC257A

LIMITS

CC

"5

"10

V

µ
µA
µA

AC CHARACTERISTICS

GND = 0 V; tr = tf v 2.5 ns; CL = 50 pF; RL = 500; T

SYMBOL PARAMETER WAVEFORM VCC = 3.3V ±0.3V VCC = 2.7V VCC = 1.2V UNIT

Propagation delay

t

PHL/tPLH

t

PHL/tPLH

t

PZH/tPZL

t

PHZ/tPLZ

nl0 to nY
nl1 to nY

Propagation delay
S to nY

3-state output enable time

OE to nY

3-state output disable time

OE to nY

Figures 1, 3 1.5 3.9 5.1 1.5 3.3 6.1 11 ns

Figures 1, 3 1.5 3.5 6.4 1.5 4.3 7.5 14 ns

Figures 2, 3 1.5 3.7 6.5 1.5 4.6 7.5 15 ns

Figures 2, 3 1.5 3.2 5.2 1.5 3.5 6.2 12 ns

NOTE:

1. These typical values are at V

= 3.3V and T

CC

amb

= –40C to +85C

amb

= 25°C.

LIMITS

MIN TYP1MAX MIN TYP1MAX TYP

1998 Jul 29

5

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

AC WAVEFORMS

V

INPUTS

GND

V

V

at VCC < 2.7 V

CC

CC

CC

1

t

PHL

OH

OL

at V

CC

< 2.7 V

V

M

V

t

PLH

M

SV00641

VM = 0.5 × V

= 1.5 V at VCC ≥ 2.7 V

V

M

V

= VOL + 0.3 V at VCC ≥ 2.7 V

X

= VOL + 0.1 ×V

V

X

V

= VOH – 0.3 V at VCC ≥ 2.7V

Y

V

= VOH – 0.1 × VCC at VCC < 2.7 V

Y

V

and VOH are the typical output voltage drop that occur with the

OL

output load.

S, nI0, nI

nY OUTPUT

Figure 1. Input (S, nl0, nl1) to output (nY) propagation delays.

TEST CIRCUIT

PULSE

GENERATOR

V

V

CC

 2.7V V

2.7V – 3.6V 2.7V

Figure 3. Load circuitry for switching times.

74LVC257A

S

1

2 x V

V

CC

50pF

Open

2 x V

GND

500Ω

500Ω

1

CC

I

R

T

V

CC

D.U.T.

I

V

O

C

L

t

PLH/tPHL

t

PLZ/tPZL

t

PHZ/tPZH

Test S

Open
GND

SY00003

CC

OE INPUT

GND

V

OUTPUT

LOW-to-OFF
OFF-to-LOW

V

V

OUTPUT

HIGH-to-OFF
OFF-to-HIGH

GND

V

I

V

M

outputs

disabled

t

PZL

t

PZH

t

outputs

enabled

PLZ

t

PHZ

V

X

V

Y

CC

OL

OH

Figure 2. 3-state enable and disable times.

V

M

V

M

outputs

enabled

SV00642

1998 Jul 29

6

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

74LVC257A

1998 Jul 29

7

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1

74LVC257A

1998 Jul 29

8

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1

74LVC257A

1998 Jul 29

9

Philips Semiconductors Product specification

Quad 2-input multiplexer with 5 Volt tolerant
inputs/outputs (3-State)

Data sheet status

Data sheet
status

Objective
specification

Preliminary
specification

Product
specification

Product
status

Development

Qualification

Production

Definition

This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.

This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.

[1]

74LVC257A

[1] Please consult the most recently issued datasheet before initiating or completing a design.

Definitions

Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For

detailed information see the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one

or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.

Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.

Disclaimers

Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can

reasonably be expected to result in personal injury . Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.

Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone [phone]

 Copyright Philips Electronics North America Corporation 1998

All rights reserved. Printed in U.S.A.

print code Date of release: 08-98
Document order number: 9397-750-04504

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