Datasheet 74f251a DATASHEETS (Philips)

Philips Semiconductors Product specification

74F251A8-input multiplexer (3-State)

FEA TURES

•High speed 8-to-1 multiplexing

•On chip decoding

•Multifunction capability

•Inverting and Non-Inverting outputs

•Both outputs are 3-State for further multiplexer expansion

DESCRIPTION

The 74F251A is a logic implementation of a single 8-position switch with the switch position controlled by the state of three Select (S0, S1, S2) inputs. True (Y) and complementary (Y provided. The output enable (OE

) is active Low. When OE is High, both outputs are in High impedance state, allowing multiple output connections to a common bus without driving nor loading the bus significantly . All but one device must be in High impedance state to avoid high currents that would exceed the maximum ratings when the outputs of the 3-State devices are tied together. When the output of more than one device is tied together the user must ensure that there is no overlap in the active Low portion of the output enable voltages.

) outputs are both

PIN CONFIGURA TION

1

I3

2

I2 I1

3

I0

4

Y

5 6

Y

OE

TYPICAL

TYPE

PROPAGATION

DELA Y

74F251A 4.5ns 19mA

16

V

CC

15

I4

14

I5

13

I6

12

I7

11

S0

107

S1

98GND S2

TYPICAL

SUPPLY CURRENT

(TOTAL)

ORDERING INFORMATION

ORDER CODE

DESCRIPTION

16-pin plastic DIP N74F251AN SOT38-4

16-pin plastic SO N74F251AD SOT162-1

COMMERCIAL RANGE

= 5V ±10%,

V

CC

= 0°C to +70°C

T

amb

SF00778

PKG

DWG #

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW

I0–I7 Data inputs 1.0/1.0 20µA/0.6mA

S0–S2 Select inputs 1.0/1.0 20µA/0.6mA

OE Output Enable input (active Low) 1.0/1.0 20µA/0.6mA

Y, Y Data outputs 150/40 3mA/24mA

NOTE:

One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

LOGIC SYMBOL

11 10

9 7

V

= Pin 16

CC

GND = Pin 8

4 12131415

I0 I1 I2 I3 I4 I5 I6 I7 S0 S1

S2

OE

123

YY

65

SF00779

IEC/IEEE SYMBOL

7 11 10 9 4 3 2 1 15 14 13 12

EN

MUX

0

G

7

2

5

6

SF00780

1996 Jan 05 853–0358 16191

1

Philips Semiconductors Product specification

74F251A8-input multiplexer (3-State)

LOGIC DIAGRAM

I0 I1 I2 I3 I4 I5 I6 I7

4 3 2 1 15 14 13 12

OE

11

S0

10

S1

9

S2

7

V

= Pin 16

CC

GND = Pin 8

FUNCTION TABLE

INPUTS OUTPUTS

S2 S1 S0 OE Y Y

X X X H Z Z L L L L I0 I0 L L H L I1 I1 L H L L I2 I2 L H H L I3 I3 H L L L I4 I4 H L H L I5 I5 H H L L I6 I6 H H H L I7 I7

NOTES:

H = High voltage level L = Low voltage level X = Don’t care Z = High impedance “off” state

56

YY

SF00781

1996 Jan 05

2

Philips Semiconductors Product specification

SYMBOL

PARAMETER

UNIT

SYMBOL

PARAMETER

TEST CONDITIONS

1

UNIT

VOHHigh-l

VCC MIN, VIL MAX,

VOLL

VCC MIN, VIL MAX,

CC

pp y ( )

CC

74F251A8-input multiplexer (3-State)

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.)

SYMBOL

V V I

IN

V I

OUT

T T

CC IN

OUT

amb stg

Supply voltage –0.5 to +7.0 V Input voltage –0.5 to +7.0 V Input current –30 to +5 mA Voltage applied to output in High output state –0.5 to V Current applied to output in Low output state 48 mA Operating free-air temperature range 0 to +70 °C Storage temperature –65 to +150 °C

RECOMMENDED OPERATING CONDITIONS

V V V I I I T

CC IH

IL IK OH OL

amb

Supply voltage 4.5 5.0 5.5 V High-level input voltage 2.0 V Low-level input voltage 0.8 V Input clamp current –18 mA High-level output current –3 mA Low-level output current 24 mA Operating free-air temperature range 0 70 °C

PARAMETER RATING UNIT

CC

V

LIMITS

MIN NOM MAX

DC ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temperature range unless otherwise noted.)

1

±10%V

±5%V

±10%V

±5%V

CC

V I

I

IH

I

IL

I

OZH

I

OZL

I

OS

I

CC

evel output voltage

ow-level output voltage

IK

Input clamp voltage VCC = MIN, II = I Input current at maximum input

voltage

VCC = MIN, VIL = MAX, VIH = MIN, I

OH

= MAX

VCC = MIN, VIL = MAX, VIH = MIN, I

OL

= MAX

IK

VCC = MAX, VI = 7.0V 100 µA

High-level input current VCC = MAX, VI = 2.7V 20 µA Low-level input current VCC = MAX, VI = 0.5V –0.6 mA Off-state output current

High-level voltage applied Off-state output current

Low-level voltage applied Short-circuit output current

Supply current (total)

3

I

CCH

I

CCL

I

CCZ

VCC = MAX, VI = 2.7V 50 µA

VCC = MAX, VI = 0.5V –50 mA VCC = MAX –60 –150 mA

VCC = MAX

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.

2. All typical values are at V

3. Not more than one output should be shorted at a time. For testing I

= 5V, T

CC

techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting

amb

= 25°C.

, the use of high-speed test apparatus and/or sample-and-hold

OS

of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, I

tests should be performed last.

OS

LIMITS

MIN TYP2MAX

2.4 V

2.7 3.3 V

0.35 0.50 V

–0.73 –1.2 V

20 27 mA 17 24 mA 21 29 mA

1996 Jan 05

3

Philips Semiconductors Product specification

74F251A8-input multiplexer (3-State)

AC ELECTRICAL CHARACTERISTICS

LIMITS

SYMBOL PARAMETER

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

t

PZH

t

PZL

t

PHZ

t

PLZ

Propagation delay In to Y

Propagation delay Sn to Y

Output Enable time OE to Y

Output Disable time

to Y

OE Output Enable time

to Y

OE Output Disable time

to Y

OE

TEST

CONDITION

Waveform 2

Waveform 1 Waveform 1

Waveform 2 Waveform 1

Waveform 2 Waveform 3

Waveform 4 Waveform 3

Waveform 4

VCC = +5V

= +25°C

T

amb

= 50pF

C

L

= 500Ω

R

L

MIN TYP MAX MIN MAX

3.0

2.5

1.0

4.5

4.0

3.5

2.5

3.5

2.5

1.0

2.5

3.5

1.0

5.0

4.5

2.5

6.5

5.5

6.0

4.5

5.5

5.0

4.0

5.0

2.0

7.0

5.0

10.0

9.0

7.0

7.5

6.5

6.0

6.5

7.5

4.5

VCC = +5V ± 10%

= 0°C to +70°C

T

amb

= 50pF

C

L

= 500Ω

R

L

2.5

3.0

2.0

1.0

4.0

3.5

2.5

3.0

2.0

1.0

2.0

2.5

3.0

1.0

8.0

7.5

5.0

11.5

9.5

7.5

8.5

8.0

7.0

6.5

7.0

8.0

4.5

UNIT

ns

AC WAVEFORMS

For all waveforms, VM = 1.5V

V

IN

V

OUT

Waveform 1. For Inverting Outputs

OE

Y, Y

Waveform 3. 3-State Output Enable Time to High Level and

Output Disable Time from High Level

V

M

t

PHL

V

M

t

PZH

V

M

t

PLH

t

V

PHZ

V

M

SF00782

M

VOH –0.3V

SF00784

V

M

V

M

V

IN

V

OUT

V

M

t

PLH

V

M

t

PHL

V

M

V

M

SF00092

Waveform 2. For Non-Inverting Outputs

OE

0V

Y, Y

V

M

t

PZL

V

M

t

PLZ

M

VOL +0.3V

SF00785

Waveform 4. 3-State Output Enable Time to Low Level and

Output Disable Time from Low Level

1996 Jan 05

4

Philips Semiconductors Product specification

74F251A8-input multiplexer (3-State)

TEST CIRCUIT AND WAVEFORMS

V

PULSE

GENERATOR

IN

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST SWITCH

t t

PLZ PZL

closed closed

All other open

CC

R

V

D.U.T.

R

T

OUT

L

R

C

L

7.0V NEGATIVE

PULSE

POSITIVE PULSE

90%

10%

V

M

10%

t

THL (tf

t

TLH (tr

90%

V

M

Input Pulse Definition

t

w

V

M

10%

)

t

w

t

TLH (tr

t

THL (tf

)

90%

V

M

90%

10%

AMP (V)

0V

AMP (V)

0V

DEFINITIONS:

= Load resistor;

R

L

see AC electrical characteristics for value.

= Load capacitance includes jig and probe capacitance;

C

L

see AC electrical characteristics for value.

= Termination resistance should be equal to Z

R

T

pulse generators.

OUT

of

family

74F

INPUT PULSE REQUIREMENTS

V

amplitude

3.0V

M

1.5V

rep. rate

1MHz 500ns

t

w

t

TLH

t

THL

2.5ns 2.5ns

SF00777

1996 Jan 05

5