54AC158.pdf

July 1998

54AC158 • 54ACT158

Quad 2-Input Multiplexer

General Description

The ’AC/’ACT158 is a high-speed quad 2-input multiplexer. It

selects four bits of data from two sources using the common

Select and Enable inputs. The four buffered outputs present

the selected data in the inverted form. The ’AC/’ACT158 can

also be used as a function generator.

n Outputs source/sink 24 mA

n ’ACT158 has TTL-compatible inputs

n Standard Microcircuit Drawing (SMD)

— ’AC158: 5962-89729

— ’ACT158: 5962-88755

Features

n I CC reduced by 50%

Logic Symbols

Connection Diagrams

Pin Assignment

for DIP and Flatpak

DS100273-1

IEE/IEC

DS100273-3

Pin Assignment

for LCC

DS100273-2

DS100273-4

Pin Names

Description

I 0a –I 0d

Source 0 Data Inputs

I 1 a –I 1d

Source 1 Data Inputs

Enable Input

Select Input

Z a –Z d

Inverted Outputs

FACT ™ is a trademark of Fairchild Semiconductor Corporation.

www.national.com

DS100273

Functional Description

The ’AC/’ACT158 quad 2-input multiplexer selects four bits

of data from two sources under the control of a common Se-

lect input (S) and presents the data in inverted form at the

four outputs. The Enable i nput (E) is active-LOW. When E is

HIGH, all of the outputs (Z) are forced HIGH regardless of all

other inputs. The ’AC/’ACT158 is the logic implementation of

a 4-pole, 2-position switch where the position of the switch is

determined by the logic levels supplied to the Select input.

A common use of the ’AC/’ACT158 is the moving of data

from two groups of registers to four common output busses.

The particular register from which the data comes is deter-

mined by the state of the Select input. A less obvious use is

as a function generator. The ’AC/’ACT158 can generate four

functions of two variables with one variable common. This is

useful for implementing gating functions.

Truth Table

Inputs

Out p uts

I 0

I 1

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Logic Diagram

DS100273-5

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (V CC )

Recommended Operating

Conditions

Supply Voltage (V CC )

’AC

2.0V to 6.0V

−0.5V to +7.0V

’ACT

4.5V to 5.5V

DC Input Diode Current (I IK )

V I = −0.5V

Input Voltage (V I )

0VtoV CC

−20 mA

Output Voltage (V O )

0VtoV CC

V I = V CC + 0.5V

+20 mA

Operating Temperature (T A )

54AC/ACT

DC Input Voltage (V I )

−0.5V to V CC + 0.5V

−55˚C to +125˚C

DC Output Diode Current (I OK )

V O = −0.5V

Minimum Input Edge Rate (

−20 mA

’AC Devices

V IN from 30% to 70% of V CC

V CC @ 3.3V, 4.5V, 5.5V

V O = V CC + 0.5V

+20 mA

DC Output Voltage (V O )

−0.5V to V CC + 0.5V

125 mV/ns

DC Output Source

or Sink Current (I O )

Minimum Input Edge Rate (

± 50 mA

’ACT Devices

V IN from 0.8V to 2.0V

V CC @ 4.5V, 5.5V 125 mV/ns

Note 1: Absolute maximum ratings are those values beyond which damage

to the device may occur. The databook specifications should be met, without

exception, to ensure that the system design is reliable over its power supply,

temperature, and output/input loading variables. National does not recom-

mend operation of FACT ™ circuits outside databook specifications.

DC Characteristics for ’AC Family Devices

DC V CC or Ground Current

per Output Pin (I CC or I GND )

± 50 mA

Storage Temperature (T STG )

−65˚C to +150˚C

Junction Temperature (T J )

CDIP

175˚C

54AC

T A =

Symbol

Parameter

V CC

Units

Conditions

(V)

−55˚C to +125˚C

Guaranteed

Limits

V OUT = 0.1V

V IH

Minimum High Level

3.0

2.1

Input Voltage

4.5

3.15

or V CC − 0.1V

5.5

3.85

V OUT = 0.1V

V IL

Maximum Low Level

3.0

0.9

Input Voltage

4.5

1.35

or V CC − 0.1V

5.5

1.65

I OUT = −50 µA

V OH

Minimum High Level

3.0

2.9

Output Voltage

4.5

4.4

5.5

5.4

(Note 2)

V IN = V IL or V IH

3.0

2.4

I OH = −12 mA

4.5

3.7

I OH = −24 mA

5.5

4.7

I OH = −24 mA

I OUT = 50 µA

V OL

Maximum Low Level

3.0

0.1

Output Voltage

4.5

0.1

5.5

0.1

(Note 2)

V IN = V IL or V IH

3.0

0.50

I OL =12mA

4.5

0.50

I OL =24mA

5.5

0.50

I OL =24mA

± 1.0

V I = V CC , GND

I IN

Maximum Input

5.5

µA

Leakage Current

www.national.com

DC Characteristics for ’AC Family Devices (Continued)

54AC

T A =

Symbol

Parameter

V CC

Units

Conditions

(V)

−55˚C to +125˚C

Guaranteed

Limits

V OLD = 1.65V Max

I OLD

Minimum Dynamic

Output Current (Note 3)

5.5

V OHD = 3.85V Min

I OHD

5.5

−50

V IN = V CC

I CC

Maximum Quiescent

5.5

80.0

µA

Supply Current

or GND

Note 2: All outputs loaded; thresholds on input associated with output under test.

Note 3: Maximum test duration 2.0 ms, one output loaded at a time.

Note 4: I IN and I CC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V V CC .

I CC for 54AC @ 25˚C is identical to 74AC @ 25˚C.

DC Characteristics for ’ACT Family Devices

54ACT

Symbol

Parameter

V CC

T A =

Units

Conditions

(V)

−55˚C to +125˚C

Guaranteed

Limits

V IH

Minimum High Level

4.5

2.0

V OUT = 0.1V

Input Voltage

5.5

2.0

or V CC − 0.1V

V IL

Maximum Low Level

4.5

0.8

V OUT = 0.1V

Input Voltage

5.5

0.8

or V CC − 0.1V

V OH

Minimum High Level

4.5

4.4

I OUT = −50 µA

Output Voltage

5.5

5.4

(Note 5)

V IN = V IL or V IH

4.5

3.70

I OH = −24 mA

5.5

4.70

I OH = −24 mA

V OL

Maximum Low Level

4.5

0.1

I OUT = 50 µA

Output Voltage

5.5

0.1

(Note 5)

V IN = V IL or V IH

4.5

0.50

I OL =24mA

5.5

0.50

I OL =24mA

± 1.0

V I = V CC , GND

I IN

Maximum Input

5.5

µA

Leakage Current

V I = V CC − 2.1V

I CCT

Maximum

5.5

1.6

I CC /Input

V OLD = 1.65V Max

I OLD

Minimum Dynamic

Output Current (Note 6)

5.5

I OHD

5.5

−50

V OHD = 3.85V Min

I CC

Maximum Quiescent

5.5

80.0

µA

V IN = V CC

Supply Current

or GND

Note 5: All outputs loaded; thresholds on input associated with output under test.

Note 6: Maximum test duration 2.0 ms, one output loaded at a time.

Note 7: I CC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.

www.national.com

AC Electrical Characteristics

54AC

T A = −55˚C

V CC

Fig.

Symbol

Parameter

(V)

to +125˚C

Units

No.

C L = 50 pF

(Note 8)

Min

Max

t PLH

Prop ag ation Delay

3.3

1.0

14.0

StoZ n

5.0

1.0

11.0

t PHL

Prop ag ation Delay

3.3

1.0

14.0

StoZ n

5.0

1.0

11.0

t PLH

Propagation Delay

3.3

1.0

15.0

EtoZ n

5.0

1.0

12.0

t PHL

Propagation Delay

3.3

1.0

14.0

EtoZ n

5.0

1.0

10.0

t PLH

Prop ag ation Delay

3.3

1.0

11.0

I n to Z n

5.0

1.0

8.5

t PHL

Prop ag ation Delay

3.3

1.0

10.0

I n to Z n

5.0

1.0

7.5

Note 8: Voltage Range 3.3 is 3.3V ± 0.3V

Voltage Range 5.0 is 5.0V ± 0.5V

AC Electrical Characteristics

54ACT

V CC

T A = −55˚C

Fig.

Symbol

Parameter

(V)

to +125˚C

Units

No.

(Note 9)

C L = 50 pF

Min

Max

t PLH

Prop ag ation Delay

5.0

1.0

12.0

StoZ n

t PHL

Prop ag ation Delay

5.0

1.0

11.5

StoZ n

t PLH

Propagation Delay

5.0

1.0

11.0

EtoZ n

t PHL

Propagation Delay

5.0

1.0

11.0

EtoZ n

t PLH

Prop ag ation Delay

5.0

1.0

9.5

I n to Z n

t PHL

Prop ag ation Delay

5.0

1.0

8.0

I n to Z n

Note 9: Voltage Range 5.0 is 5.0V ± 0.5V

Capacitance

Symbol

Parameter

Typ

Units

Conditions

V CC = OPEN

C IN

Input Capacitance

4.5

V CC = 5.0V

C PD

Power Dissipation

45.0

Capacitance

www.national.com

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: