Philips 74LV251PW, 74LV251N, 74LV251DB, 74LV251D Datasheet

INTEGRATED CIRCUITS

74LV251

8-input multiplexer (3-State)

Product specification Supersedes data of 1997 Apr 10 IC24 Data Handbook

 

1998 May 20

Philips Semiconductors Product specification

74L V2518-input multiplexer (3-State)

FEA TURES

•Optimized for low voltage applications: 1.0 to 3.6 V

•Accepts TTL input levels between V

•Typical V

T

amb

•Typical V

T

amb

(output ground bounce) < 0.8 V at V

OLP

= 25°C

(output VOH undershoot) > 2 V at V

OHV

= 25°C

= 2.7 V and V

CC

= 3.3 V,

•True and complement outputs

•Both outputs are 3-State for further multiplexer expansion

•Multifunction capability

•Permits multiplexing from n-lines to one line

•Output capability: standard

•I

category: MSI

CC

QUICK REFERENCE DATA

GND = 0 V; T

SYMBOL

t

PHL/tPLH

C

I

C

PD

NOTE:

1. C

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

PD

= CPD × V

P

D

f

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

i

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

f

o

 (C

L

= 25°C; tr = t

amb

Propagation delay In to Y In to Y Sn to Y S

to Y

n

Input capacitance 3.5 pF Power dissipation capacitance per gate

2

× fi  (CL × V

CC

2

× V

× fo) = sum of the outputs.

CC

≤ 2.5 ns

f

PARAMETER CONDITIONS TYPICAL UNIT

2

× fo) where:

CC

= 3.6 V

CL = 15 pF; VCC = 3.3 V

VCC = 3.3 V VI = GND to V

DESCRIPTION

The 74LV251 is a low-voltage Si-gate CMOS device and is pin and function compatible with 74HC/HCT251.

The 74LV251 is an 8-input multiplexer with 8 binary inputs (I output enable input (OE the eight binary inputs is selected by the select inputs and is routed to the outputs (Y, Y). Both outputs are in the high impedance OFF-state (Z) when the output enable input is HIGH, allowing multiplexer expansion by tying the outputs.

1

CC

) and three select inputs (S0, S1, S2). One of

14 16 19 20

44 pF

to I7), an

0

ns

ORDERING INFORMATION

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

16-Pin Plastic DIL –40°C to +125°C 74LV251 N 74LV251 N SOT38-4 16-Pin Plastic SO –40°C to +125°C 74LV251 D 74LV251 D SOT109-1 16-Pin Plastic SSOP Type II –40°C to +125°C 74L V251 DB 74LV251 DB SOT338-1 16-Pin Plastic TSSOP Type I –40°C to +125°C 74LV251 PW 74LV251PW DH SOT403-1

1998 May 20 853–1967 19420

2

Philips Semiconductors Product specification

74LV2518-input multiplexer (3-State)

PIN CONFIGURATION

1

I

3

2

I

2

3

I

1

4

I

0

5

Y

6

Y

7

QE

8

GND

LOGIC SYMBOL

S0 S1 S2

4

3

2

1

15

14

13

12

I

0

I

1

I

2

I

3

I

4

I

5

I

6

I

7

11 10 9

OE

7

Y

16

15

14

13

12

11

10

9

SV00629

SV00630

PIN DESCRIPTION

V

CC

I

4

I

5

I

6

I

7

S

0

S

1

S

2

NUMBER

4, 3, 2, 1, 15, 14, 13, 12

5 Y Multiplexer output 6 Y Complementary multiplexer output

7 OE 8 GND Ground (0 V)

11, 10, 9 S0 to S2Select inputs 16 V

SYMBOL FUNCTION

I0 to I

Multiplexer inputs

7

3-State output enable input (active LOW)

CC

Positive supply voltage

LOGIC SYMBOL (IEEE/IEC)

MUX

7

EN

11

10

5

6

15

14 13

12

0

G 9 4 3 2 1

7

2 0 1 2 3

4

5

6 7

5

6

SV00631

FUNCTIONAL DIAGRAM

4 3 2 1 15 14 13 12

I1I2I3I4I5I6I

I

0

S

11

0

S

10

S

9

OE

7

1998 May 20

1

2

MULTIPLEXER

7

Y

6

Y

5

SV00632

3

Philips Semiconductors Product specification

74LV2518-input multiplexer (3-State)

FUNCTION TABLE

INPUTS OUTPUTS

OE S

2

H X X X X X X X X X X X Z Z

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

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

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

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

NOTES:

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

S

1

S

0

I

0

I

1

I

2

I

3

I

4

I

5

I

6

I

7

Y Y

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT

V

T

amb

tr, t

NOTE:

1. The LV is guaranteed to function down to V

DC supply voltage See Note 1 1.0 3.3 3.6 V

CC

Input voltage 0 – V

I

Output voltage 0 – V

O

Operating ambient temperature range in free air

Input rise and fall times

f

CC

See DC and AC

characteristics

VCC = 1.0V to 2.0V VCC = 2.0V to 2.7V VCC = 2.7V to 3.6V

= 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.

–40 –40

– – –

CC CC

+85

+125

500 200 100

ns/V

V V

°C

1998 May 20

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