Datasheet 74LVX257 Datasheet (ST)

74LVX257

LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER

(3-STATE) WITH 5V TOLERANT INPUTS

■ HIGH SPEED:

t

=5.8ns (TY P.) at VCC = 3.3V

PD

■ 5V TOLERANT INPUTS

■ POWER-DOWN PROTECTION ON INPUTS

■ INPUT VOLTAGE LEVEL:

V

= 0.8V, VIH = 2V at VCC =3V

IL

■ LOW POWER DISSIPATION:

I

= 4 µA (MAX.) at TA=25°C

CC

■ LOW NOISE:

V

= 0.3V (TYP.) at VCC =3.3V

OLP

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

| = IOL = 4 mA (MIN) at VCC =3V

OH

■ BALANCED PROPAGATION DELAYS:

t

≅ t

PLH

PHL

■ OPERATING VOLTAGE RANGE:

V

(OPR) = 2V to 3.6V (1.2V Data Retention)

CC

■ PIN AND FUNCTION COMPATIBLE WITH

74 SERIES 257

■ IMPROVED LATCH-UP IMMUNITY

DESCRIPTION

The 74LVX257 i s a low voltage CMOS QUAD 2
CHANNEL MULTIPLEXER (3-STATE) fabricated
with sub-micron silicon gate and double-layer
metal wiring C

2

MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
It is composed of four independent 2-channel
multiplexers with common SELECT and ENA BLE
(OE

) INPUT. The 74LVX257 is a non-inverting

TSSOPSOP

Table 1: Order Codes

PACKAGE T & R

SOP 74LVX257MTR

TSSOP 74LVX257TTR

multiplexer. When the ENABLE INPUT is held
"High", all outputs become in high impedance
state. If SELECT INPUT is held "Low", "A" dat a is
selected, when SELECT INPUT is "High", "B" data
is chosen.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V. It
combines high speed performance with the true
CMOS low power consumption.
All inputs and outputs are equipped with
protection circuits against static disc harge, giving
them 2KV ESD immunity and transient excess
voltage.

Figure 1: Pin C onnection And IEC Logic Symbol s

Rev. 3

1/13August 2004

74LVX257

Figure 2: Input Equivalent Circuit Table 2: Pin Description

PIN N° SYMBOL NAME AND FUNCTION

1 SELECT Common Data Select

Inputs

2, 5, 11, 14 1A to 4A Data Inputs From Source

A

3, 6, 10, 13 1B to 4B Data Inputs From Source

B

Table 3: Truth Table

4, 7, 9, 12 1Y to 4Y 3 State Multiplexer

15 OE

8 GND Ground (0V)

16 V

INPUTS OUTPUT

CC

Outputs
3 State Output Enable

Inputs (Active LOW)

Positive Supply Voltage

OE

HXXXZ

LLLXL
LLHXH
LHXLL
LHXHH

X :Don‘t Care
Z : High Impedance

Figure 3: Logic Diagram

SELECT A B Y

This logi c di agram has not be used to est i m ate propagation delays

2/13

74LVX257

Table 4: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

V

V

I

I

OK

I

or I

I

CC

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied

Table 5: Recommended Operating Conditions

Symbol Parameter Value Unit

V

V
V
T

dt/dv

Supply Voltage

CC

DC Input Voltage

I

DC Output Voltage -0.5 to VCC + 0.5

O

DC Input Diode Current

IK

DC Output Diode Current
DC Output Current

O

DC VCC or Ground Current

GND

Storage Temperature

stg

Lead Temperature (10 sec)

L

Supply Voltage (note 1)

CC

Input Voltage

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time (note 2) (V

CC

= 3V)

-0.5 to +7.0 V

-0.5 to +7.0 V

- 20 mA

± 20 mA
± 25 mA
± 50 mA

-65 to +150 °C
300 °C

2 to 3.6 V
0 to 5.5 V

CC

-55 to 125 °C
0 to 100 ns/V

V

V

1) Truth T abl e guarante ed: 1.2V to 3.6V

2) V

from 0.8V to 2.0V

IN

Table 6: DC Specifications

Symbol Parameter

V

V

V

High Level Input

IH

Voltage

V

Low Level Input

IL

Voltage

High Level Output

OH

Voltage

Low Level Output

OL

Voltage

High Impedance

I

OZ

Output Leakage
Current

I

Input Leakage

I

Current

I

Quiescent Supply

CC

Current

Test Condition Value

V

(V)

CC

T

A

Min. Typ. Max. Min. Max. Min. Max.

-40 to 85°C -55 to 125°C

= 25°C

2.0 1.5 1.5 1.5

2.0 2.0 2.0

3.6

2.4 2.4 2.4

2.0 0.5 0.5 0.5

3.6 0.8 0.8 0.8

2.0

3.0

2.0

3.0

3.6

3.6

3.6

IO=-50 µA

=-50 µA

I

O

=-4 mA

I

O

IO=50 µA
I

=50 µA

O

=4 mA

I

O

= VIH or V

V

I

IL

VO = VCC or GND

= 5.5V or GND

V

I

= VCC or GND

V

I

1.9 2.0 1.9 1.9

2.9 3.0 2.9 2.9

2.58 2.48 2.4

0.0 0.1 0.1 0.1

0.0 0.1 0.1 0.1

0.36 0.44 0.55

±0.25 ± 2.5 ± 5 µA

± 0.1 ± 1 ± 1 µA

44040µA

Unit

V3.0

V3.0 0.8 0.8 0.8

V3.0

V3.0

3/13

74LVX257

Table 7: Dynamic Switching Characteristics

Test Condition Value

= 25°C

Symbol Parameter

V
V

Dynamic Low

OLP

Voltage Quiet

OLV

Output (note 1, 2)

V

CC

(V)

3.3

T

A

Min. Typ. Max. Min. Max. Min. Max.

0.3 0.5

-0.5 -0.3

Dynamic High

V

IHD

Voltage Input

3.3 2.0

= 50 pF

C

L

(note 1, 3)
Dynamic Low

V

ILD

Voltage Input

3.3 0.8

(note 1, 3)

1) Worst case package.

2) Max number of outp ut s defined as (n). Data inp ut s are driven 0V to 3.3V, (n-1) outputs switc hi ng and one out put at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V
(V

), f=1MHz.

IHD

Table 8: AC Electrical Characteristics (Input tr = tf = 3ns)

Test Condition Value

-40 to 85°C -55 to 125°C

ILD

Unit

V

), 0V to thresho l d

= 25°C

Symbol Parameter

t

Propagation Delay

PLH

t

t
t

t
t

t
t

t

OSLH

t

OSHL

1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch­ing in the sa m e di rection, ei ther HIGH or LOW

2) Param eter guaran teed by design
(*) Voltage range is 3.3V ±

Time

PHL

A, B, to Y

Propagation Delay

PLH

Time

PHL

SELECT to Y

Output Enable

PZL

Time

PZH

Output Disable

PLZ

Time

PHZ

Output to Output
Skew Time (note
1,2)

0.3V

V

C

CC

(V)

L

(pF)

2.7 15 7.0 13.0 1.0 15.4 1.0 16.4

2.7 50 9.5 18.0 1.0 20.3 1.0 21.3

(*)

3.3

3.3

15 5.8 9.3 1.0 11.0 1.0 12.0

(*)

50 8.3 12.8 1.0 14.5 1.0 15.5

2.7 15 8.5 15.4 1.0 18.2 1.0 20.0

2.7 50 10.5 20.3 1.0 23.1 1.0 24.5

(*)

3.3

3.3

15 7.0 11.0 1.0 13.0 1.0 14.0

(*)

50 9.5 14.5 1.0 16.5 1.0 18.0

2.7 15 8.0 14.7 1.0 17.5 1.0 18.5

2.7 50 10.5 19.6 1.0 22.4 1.0 24.0

(*)

3.3

3.3

15 6.7 10.5 1.0 12.5 1.0 13.5

(*)

50 9.2 14.0 1.0 16.0 1.0 17.0

2.7 50 9.5 16.8 1.0 18.9 1.0 20.0

(*)

3.3

50 8.6 12.0 1.0 13.5 1.0 15.0

2.7 50 0.5 1.0 1.5 1.5

(*)

3.3

50 0.5 1.0 1.5 1.5

T

A

-40 to 85°C -55 to 125°C

Min. Typ. Max. Min. Max. Min. Max.

Unit

ns

ns

ns

ns

ns

4/13

Table 9: Capacitive Characteristics

Test Condition Value

Symbol Parameter

C

C

C

Input Capacitance

IN

Output

OUT

Capacitance
Power Dissipation

PD

Capacitance
(note 1)

V

CC

(V)

3.3 4 10 10 10 pF

3.3 6 pF

3.3 23 pF

74LVX257

= 25°C

T

A

Min. Typ. Max. Min. Max. Min. Max.

-40 to 85°C -55 to 125°C

Unit

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (R ef er to Test Circ ui t). Averag e operatin g current can be obtained by t he following equation. I
channel)

= CPD x VCC x fIN + ICC/4 (per

CC(opr)

Figure 4: Test Circuit

TEST SWITCH

, t

t

PLH

t

PZL

t

PZH

PHL

, t

PLZ

, t

PHZ

Open

V

CC

GND

CL =15/50pF or equivalent (i ncludes jig an d probe capac i tance)

= R1 = 1KΩ or equivalen t

R

L

= Z

R

of pulse generator (typically 50Ω)

T

OUT

5/13

74LVX257

Figure 5: Waveform - Propagation Delays For Inverting Conditions (f=1MHz; 50% duty cyc le)

Figure 6: Waveform - Propagation Delays For Non-inverting Conditions (f=1MHz; 50% duty cycle)

6/13

74LVX257

Figure 7: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)

7/13

74LVX257

SO-16 MECHANICAL DATA

DIM.

A 1.75 0.068
a1 0.1 0.25 0.004 0.010
a2 1.64 0.063

b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010

C 0.5 0.019
c1 45° (typ.)

D 9.8 10 0.385 0.393

E 5.8 6.2 0.228 0.244

e 1.27 0.050
e3 8.89 0.350

F 3.8 4.0 0.149 0.157

G 4.6 5.3 0.181 0.208

L 0.5 1.27 0.019 0.050

M 0.62 0.024

S8° (max.)

MIN. TYP MAX. MIN. TYP. MAX.

mm. inch

8/13

0016020D

74LVX257

TSSOP16 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c 0.09 0.20 0.004 0.0079

D 4.9 5 5.1 0.193 0.197 0.201

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0˚ 8˚0˚ 8˚

L 0.45 0.60 0.75 0.018 0.024 0.030

A2

A

A1

b

e

c

K

L

E

D

E1

PIN 1 IDENTIFICATION

1

0080338D

9/13

74LVX257

Tape & Reel SO-16 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 330 12.992

C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362

T 22.4 0.882

Ao 6.45 6.65 0.254 0.262
Bo 10.3 10.5 0.406 0.414
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161

P 7.9 8.1 0.311 0.319

10/13

74LVX257

Tape & Reel TSSOP16 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 330 12.992

C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362

T 22.4 0.882

Ao 6.7 6.9 0.264 0.272
Bo 5.3 5.5 0.209 0.217
Ko 1.6 1.8 0.063 0.071
Po 3.9 4.1 0.153 0.161

P 7.9 8.1 0.311 0.319

11/13

74LVX257

Table 10: Revision History

Date Revision Description of Change s

27-Aug-2004 3 Ordering Codes Revision - pag. 1.

12/13

74LVX257

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