54ACT244.pdf , 데이터시트 , 데이타시트

No Preview Available !

www.DataSheet4U.com

August 1998

54AC244 • 54ACT244

Octal Buffer/Line Driver with TRI-STATE® Outputs

General Description

The ’AC/’ACT244 is an octal buffer and line driver designed

to be employed as a memory address driver, clock driver and

bus-oriented transmitter/receiver which provides improved

PC board density.

Features

n ICC and IOZ reduced by 50%

n TRI-STATE outputs drive bus lines or buffer memory

address registers

n Outputs source/sink 24 mA

n ’ACT244 has TTL-compatible inputs

n Standard Microcircuit Drawing (SMD)

— ’AC244: 5962-87552

— ’ACT244: 5962-87760

Logic Symbol

IEEE/IEC

Pin Names

OE1, OE2

I0– I7

O0– O7

Description

TRI-STATE Output Enable Inputs

Inputs

Outputs

DS100282-1

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

FACT® is a registered trademark of Fairchild Semiconductor Corporation.

www.national.com

No Preview Available !

Connection Diagrams

Pin Assignment for DIP

and Flatpak

DS100282-2

Pin Assignment for LCC

Truth Tables

Inputs

Outputs

OE1

(Pins 12, 14, 16, 18)

H = HIGH Voltage Level

L = LOW Voltage Level

Inputs

Outputs

OE2

(Pins 3, 5, 7, 9)

X = Immaterial

Z = High Impedance

DS100282-3

www.national.com

No Preview Available !

Absolute Maximum Ratings (Note 1)

Recommended Operating

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Supply Voltage (VCC)

DC Input Diode Current (IIK)

VI = −0.5V

VI = VCC + 0.5V

DC Input Voltage (VI)

DC Output Diode Current (IOK)

VO = −0.5V

VO = VCC + 0.5V

DC Output Voltage (VO)

DC Output Source

or Sink Current (IO)

DC VCC or Ground Current

per Output Pin (ICC or IGND)

Storage Temperature (TSTG)

Junction Temperature (TJ)

CDIP

−0.5V to +7.0V

−20 mA

+20 mA

−0.5V to VCC + 0.5V

−20 mA

+20 mA

−0.5V to VCC + 0.5V

±50 mA

−65˚C to +150˚C

175˚C

Conditions

Supply Voltage (VCC)

’AC

2.0V to 6.0V

’ACT

4.5V to 5.5V

Input Voltage (VI)

Output Voltage (VO)

Operating Temperature (TA)

54AC/ACT

0V to VCC

−55˚C to +125˚C

Minimum Input Edge Rate (∆V/∆t)

’AC Devices

VIN from 30% to 70% of VCC

VCC @ 3.3V, 4.5V, 5.5V

Minimum Input Edge Rate (∆V/∆t)

125 mV/ns

’ACT Devices

VIN from 0.8V to 2.0V

VCC @ 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

Symbol

Parameter

VIH Minimum High

Level Input

Voltage

VIL Maximum Low

Level Input

Voltage

VOH Minimum High

Level Output

Voltage

VOL Maximum Low

Level Output

Voltage

IIN Maximum Input

Leakage Current

54AC

VCC

TA =

Units

Conditions

(V) −55˚C to +125˚C

Guaranteed Limits

3.0 2.1

4.5 3.15

5.5 3.85

VOUT = 0.1V

V or VCC − 0.1V

3.0 0.9

4.5 1.35

5.5 1.65

VOUT = 0.1V

V or VCC − 0.1V

3.0 2.9

4.5 4.4

IOUT = −50 µA

5.5 5.4

3.0 2.4

(Note 2)

VIN = VIL or VIH

−12 mA

4.5 3.7

5.5 4.7

V IOH −24 mA

−24 mA

3.0 0.1

4.5 0.1

IOUT = 50 µA

5.5 0.1

3.0 0.50

(Note 2)

VIN = VIL or VIH

12 mA

4.5 0.50

5.5 0.50

V IOL 24 mA

24 mA

5.5 ±1.0 µA VI = VCC, GND

3 www.national.com

No Preview Available !

DC Characteristics for ’AC Family Devices (Continued)

Symbol

Parameter

IOZ

IOLD

IOHD

ICC

Maximum

TRI-STATE

Current

(Note 3) Minimum

Dynamic Output

Current

Maximum Quiescent

Supply Current

54AC

VCC

TA =

(V) −55˚C to +125˚C

Guaranteed Limits

5.5 ±5.0

5.5 50

5.5 −50

5.5 80.0

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: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC.

Note 5: ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C.

DC Characteristics for ’ACT Family Devices

Symbol

Parameter

VIH Minimum High Level

Input Voltage

VIL Maximum Low Level

Input Voltage

VOH Minimum High Level

Output Voltage

54ACT

VCC

TA =

(V) −55˚C to +125˚C

Guaranteed Limits

4.5 2.0

5.5 2.0

4.5 0.8

5.5 0.8

4.5 4.4

5.5 5.4

4.5 3.70

5.5 4.70

VOL Maximum Low Level

Output Voltage

4.5

5.5

0.1

IIN

IOZ

ICCT

IOLD

IOHD

ICC

Maximum Input Leakage Current

Maximum TRI-STATE

Current

Maximum ICC/Input

(Note 7) Minimum

Dynamic Output

Current

Maximum Quiescent

Supply Current

4.5

5.5

Note 6: All outputs loaded; thresholds on input associated with output under test.

Note 7: Maximum test duration 2.0 ms, one output loaded at a time.

Note 8: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C.

0.50

±1.0

±5.0

1.6

−50

80.0

Units

Conditions

VI (OE) = VIL, VIH

µA VI = VCC, VGND

VO = VCC, GND

mA VOLD = 1.65V Max

mA VOHD = 3.85V Min

µA VIN = VCC

or GND

Units

Conditions

V VOUT = 0.1V

or VCC − 0.1V

V VOUT = 0.1V

or VCC − 0.1V

V IOUT = −50 µA

(Note 6)

VIN = VIL or VIH

V IOH −24 mA

−24 mA

V IOUT = 50 µA

(Note 6)

VIN = VIL or VIH

V IOL 24 mA

24 mA

µA VI = VCC, GND

µA VI = VIL, VIH

VO = VCC, GND

mA VI = VCC − 2.1V

mA VOLD = 1.65V Max

mA VOHD = 3.85V Min

µA VIN = VCC

or GND

www.national.com

No Preview Available !

AC Electrical Characteristics

Symbol

Parameter

tPLH Propagation Delay

Data to Output

tPHL Propagation Delay

Data to Output

tPZH

Output Enable Time

tPZL Output Enable Time

tPHZ Output Disable Time

tPLZ Output Disable Time

Note 9: Voltage Range 3.3 is 3.3V ±0.3V

Voltage Range 5.0 is 5.0V ±0.5V

VCC

(V)

(Note 9)

3.3

5.0

3.3

5.0

3.3

5.0

3.3

5.0

3.3

5.0

3.3

5.0

AC Electrical Characteristics

Symbol

Parameter

tPLH Propagation Delay

Data to Output

tPHL Propagation Delay

Data to Output

tPZH

tPZL

tPHZ

tPLZ

Output Enable Time

Output Disable Time

Note 10: Voltage Range 5.0 is 5.0V ±0.5V

VCC

(V)

(Note 10)

5.0

Capacitance

Symbol

CIN

CPD

Parameter

Input Capacitance

Power Dissipation

Capacitance

Typ

4.5

45.0

Units

54AC

TA = −55˚C

to +125˚C

CL = 50 pF

Min Max

1.0 12.5

1.0 9.5

1.0 12.0

1.0 9.0

1.0 11.5

1.0 9.0

1.0 13.0

1.0 10.5

1.0 12.5

1.0 10.5

1.0 13.0

1.0 11.0

54ACT

TA = −55˚C

to +125˚C

CL = 50 pF

Min Max

1.0 10.0

1.0 9.5

1.0 11.0

1.0 11.5

Conditions

VCC = OPEN

VCC = 5.0V

Units

5 www.national.com