Datasheet 74VHC157 Datasheet (ST)

74VHC157

QUAD 2 CHANNEL MULTIPLEXER

■ HIGH SPEED: t

■ LOW POWER DISSIPATION:

I

= 4 µA (MAX.) at TA=25°C

CC

■ HIGH NOISE IMMUNITY:

V

= V

NIH

■ POWER DOWN PROTECTION ON INPUTS

■ SYMMETRICAL OUTPUT IMPEDANCE:

|I

OH

■ BALANCED PROPAGATION DELAYS:

t

PLH

■ OPERATING VOLTAGE RANGE:

V

CC

■ PIN AND FUNCTION COMPATIBLE WITH

NIL

| = IOL = 8 mA (MIN)

≅ t

PHL

(OPR) = 2V to 5.5V

= 4.1 ns (TYP.) at VCC = 5V

PD

= 28% VCC (MIN.)

74 SERIES 157

■ IMPROVED LATCH-UP IMMUNITY

■ LOW NOISE: V

= 0.8V (MAX.)

OLP

DESCRIPTION

The 74VHC157 is an advanced high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER fabricated with sub-micron silicon gate and double-layer metal wiring C

2

MOS technology. It consists of fo ur 2-input digital multiplexer with common select and strobe inputs. It is a non-inverting multiplexer. When the STROBE

TSSOPSOP

Table 1: Order Codes

PACKAGE T & R

SOP 74VHC157MTR

TSSOP 74VHC157TTR

input is held high selection of data is inhibited and all the outputs become low. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs. 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 t o 3V. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.

Figure 1: Pin Connection And IEC Logic Symbols

Rev. 4

1/12November 2004

74VHC157

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

4, 7, 9, 12 1Y to 4Y Multiplexer Outputs

15 STROBE Strobe Input

8 GND Ground (0V)

Positive Supply Voltage

Table 3: Truth Table

16 V

INPUTS OUTPUT

CC

STROBE

HXXXL

LLLXL LLHXH LHXLL LHXHH

X : Don’t ca re

Figure 3: Logic Diagram

SELECT A B Y

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74VHC157

Table 4: Absolute Maximum Ratings

Symbol Parameter Value Unit

V

I

OK

I

or I

I

CC

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

CC

Input Voltage

I

Output Voltage 0 to V

O

Operating Temperature

op

Input Rise and Fall Time (note 1) (V (V

= 3.3 ± 0.3V)

CC

= 5.0 ± 0.5V)

CC

-0.5 to +7.0 V

- 20 mA

± 20 mA ± 25 mA ± 50 mA

-65 to +150 °C 300 °C

2 to 5.5 V 0 to 5.5 V

CC

-55 to 125 °C 0 to 100

0 to 20

ns/V

V

1) VIN from 30 % t o 70% of V

CC

3/12

74VHC157

Table 6: DC Specifications

Symbol Parameter

V

High Level Input

IH

Voltage

V

Low Level Input

IL

Voltage

High Level Output

OH

Voltage

Low Level Output

OL

Voltage

Input Leakage

I

Current Quiescent Supply

I

CC

Current

V

3.0 to

0 to

Test Condition Value

= 25°C

(V)

CC

T

A

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

-40 to 85°C -55 to 125°C

2.0 1.5 1.5 1.5

5.5

0.7V

CC

0.7V

CC

0.7V

CC

2.0 0.5 0.5 0.5

5.5

2.0

3.0

4.5

3.0

4.5

2.0

3.0

4.5

3.0

4.5

5.5

=-50 µA

I

O

=-50 µA

I

O

=-50 µA

I

O

I

=-4 mA

O

=-8 mA

I

O

=50 µA

I

O

=50 µA

I

O

I

=50 µA

O

=4 mA

I

O

=8 mA

I

O

V

= 5.5V or GND

I

= VCC or GND

V

I

0.3V

CC

1.9 2.0 1.9 1.9

2.9 3.0 2.9 2.9

4.4 4.5 4.4 4.4

2.58 2.48 2.4

3.94 3.8 3.7

0.0 0.1 0.1 0.1

0.36 0.44 0.55

± 0.1 ± 1 ± 1 µA

44040µA

0.3V

CC

0.3V

CC

Unit

V

Table 7: AC Electrical Characteristics (Input t

Test Condition Value

Symbol Parameter

t

Propagation Delay

PLH

t

t t

(*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5.0V ±

Time

PHL

A, B to Y

Propagation Delay

PLH

Time

PHL

SELECT to Y

Propagation Delay

PLH

Time STROBE

PHL

0.5V

to Y

V

3.3

5.0

3.3

5.0

3.3

5.0

C

CC

(V)

L

(pF)

(*)

15 6.2 9.7 1.0 11.5 1.0 11.5

(*)

50 8.7 13.2 1.0 15.0 1.0 15.0

(**)

15 4.1 6.4 1.0 7.5 1.0 7.5

(**)

50 5.6 8.4 1.0 9.5 1.0 9.5

(*)

15 8.4 13.2 1.0 15.5 1.0 15.5

(*)

50 10.9 16.7 1.0 19.0 1.0 19.0

(**)

15 5.3 8.1 1.0 9.5 1.0 9.5

(**)

50 6.8 10.1 1.0 11.5 1.0 11.5

(*)

15 8.7 13.6 1.0 16.0 1.0 16.0

(*)

50 11.2 17.1 1.0 19.5 1.0 19.5

(**)

15 5.6 8.6 1.0 10.0 1.0 10.0

(**)

50 7.1 10.6 1.0 12.0 1.0 12.0

= tf = 3ns)

r

= 25°C

T

A

-40 to 85°C -55 to 125°C

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

Unit

ns

4/12

Table 8: Capacitive Characteristics

Test Condition Value

Symbol Parameter

C

Input Capacitance

IN

Power Dissipation

PD

Capacitance (note 1)

74VHC157

= 25°C

T

A

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

610 10 10pF

18 pF

-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 operating current can be obtained by t he following equation. I channel)

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

CC(opr)

Table 9: Dynamic Switching Characteristics

Test Condition Value

Symbol Parameter

V V

Dynamic Low

OLP

Voltage Quiet

OLV

Output (note 1, 2)

V

CC

(V)

5.0

T

A

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

0.3 0.8

-0.8 -0.3

-40 to 85°C -55 to 125°C

Unit

V

= 25°C

Dynamic High

V

IHD

Voltage Input

5.0 3.5 V

= 50 pF

C

L

(note 1, 3) Dynamic Low

V

ILD

Voltage Input

5.0 1.5 V

(note 1, 3)

1) Worst case package.

2) Max number of outp ut s defined as (n). Data inpu t s are driven 0V to 5.0V, (n-1) outputs switc hi ng and one output at GND.

3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (V (V

), f=1MHz.

IHD

), 0V to thresho l d

ILD

Figure 4: Test Circuit

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

= Z

R

of pulse generator (typically 50Ω)

T

OUT

5/12

74VHC157

Figure 5: Waveform - Propagation Delays For Inverting Conditions

Figure 6: Waveform - Propagation Delays For Non-inverting Conditions

6/12

SO-16 MECHANICAL DATA

74VHC157

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

0016020D

7/12

74VHC157

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

8/12

1

0080338D

74VHC157

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

9/12

74VHC157

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

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Table 10: Revision History

Date Revision Description of Change s

12-Nov-2004 4 Order Codes Revision - pag. 1.

74VHC157

11/12

74VHC157

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