Datasheet IN74ACT245DW Datasheet (INTEGRAL)

Octal 3-State Noninverting
Bus Transceiver

High-Speed Silicon-Gate CMOS

The IN74ACT245 is identical in pinout to the LS/ALS245,
HC/HCT245. The IN74ACT245 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.

The IN74ACT245 is a 3-state noninverting transceiver that is used
for 2-way asynchronous communication between data buses. The
device has an active-low Output Enable pin, which is used to place the
I/O ports into high-impedance states. The Direction control determines
whether data flows from A to B or from B to A.

•

TTL/NMOS Compatible Input Levels

•

Outputs Directly Interface to CMOS, NMOS, and TTL

•

Operating Voltage Range: 4.5 to 5.5 V

•

Low Input Current: 1.0 µA; 0.1 µA @ 25°C

•

Outputs Source/Sink 24 mA

TECHNICAL DATA

IN74ACT245

ORDERING INFORMATION

IN74ACT245N Plastic

IN74ACT245DW SOIC

TA = -40° to 85° C for all

packages

LOGIC DIAGRAM

PIN 20=V

PIN 10 = GND

CC

PIN ASSIGNMENT

FUNCTION TABLE

Control Inputs

Output
Enable

L L Data Transmitted

L H Data Transmitted

H X Buses Isolated

X = don’t care

Direction Operation

from Bus B to
Bus A

from Bus A to
Bus B

(High Impedanc e
State)

331

IN74ACT245

MAXIMUM RATINGS

*

Symbol Parameter Value Unit

V

CC

V

V

OUT

I

IN

I

OUT

I

CC

P

DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V
DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V

IN

DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V
DC Input Current, per Pin
DC Output Sink/Source Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+

D

SOIC Package+

±

20

±

50

±

50

750
500

Tstg Storage Temperature -65 to +150

T

Lead Temperature, 1 mm from Case for 10 Seconds

L

260

(Plastic DIP or SOIC Package)

*

Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C

SOIC Package: : - 7 mW/°C from 65° to 125°C

mA
mA
mA

mW

°

C

°

C

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Max Unit

V

CC

VIN, V

T

J

T

A

I

OH

I

OL

tr, t

f

*

VIN from 0.8 V to 2.0 V

This device c ontains p rote ction ci rcuitr y to guard a gainst damage d ue to high st atic voltages or electr ic
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, V
GND≤(V

Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or V
Unused outputs must be left open.

DC Supply Voltage (Referenced to GND) 4.5 5.5 V
DC Input Voltage, Output Voltage (Referenced to GND) 0 V

OUT

Junction Temperature (PDIP) 140
Operating Temperature, All Package Types -40 +85
Output Current - High -24 mA
Output Current - Low 24 mA
Input Rise and Fall Time

(except Schmitt Inputs)

IN

or V

OUT

)≤VCC.

*

V
V

=4.5 V

CC

=5.5 V

CC

and V

IN

0
0

should be constrained to the range

OUT

10

8.0

CC

V

°

C

°

C

ns/V

CC

).

332

IN74ACT245

DC ELECTRICAL CHARACTERISTICS

(Voltages Referenced to GND)

Symbol Parameter Test Conditions V

V

Minimum High-Level

IH

V

=0.1 V or VCC-0.1 V 4 .5

OUT

Input Voltage

V

Maximum Low -

IL

V

=0.1 V or VCC-0.1 V 4 .5

OUT

Level Input Voltage

V

OH

Minimum High-Level

I

OUT

≤ -50 µA

Output Voltage

*

VIN=VIH or V

IL

IOH=-24 mA
I

=-24 mA

OH

V

OL

Maximum Low-Level

I

OUT

≤ 50 µA

Output Voltage

*

VIN=VIH or V

IL

IOL=24 mA
I

=24 mA

OL

I

IN

Maximum Input

VIN=VCC or GND 5.5

Leakage Current

∆

I

CCT

I

OZ

Additional Max.
I

/Input

CC

Maximum Three­State Leakage
Current

I

OLD

+Minimum Dynamic

V

IN=VCC

V

IN

V

IN =VCC

V

OUT =VCC

V

OLD

- 2.1 V 5.5 1.5 mA

(OE)= VIH or V

IL

or GND

or GND

=1.65 V Max 5.5 75 mA

Output Current

I

OHD

+Minimum Dynamic

V

=3.85 V Min 5.5 -75 mA

OHD

Output Current

I

CC

Maximum Quiescent

VIN=VCC or GND 5.5 8.0 80
Supply Current
(per Package)

*

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

+Maximum test duration 2.0 ms, one output loaded at a time.

V

5.5

5.5

4.5

5.5

4.5

5.5

4.5

5.5

4.5

5.5

5.5

CC

Guaranteed Limits

25 °C-40

2.0

2.0

0.8

0.8

4.4

5.4

3.86

4.86

0.1

0.1

0.36

0.36

±

0.1

±

0.6

°

C to

85°C

2.0

2.0

0.8

0.8

4.4

5.4

3.76

4.76

0.1

0.1

0.44

0.44

±

1.0

±

6.0

Unit

V

V

V

V

µ

A

µ

A

µ

A

333

IN74ACT245

AC ELECTRICAL CHARACTERISTICS

Symbol Parameter

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

C

IN

C

OUT

C

PD

Propagation Delay, A to B, B to A (Figure 1) 1.5 7.5 1.5 8.0 ns
Propagation Delay, A to B, B to A (Figure 1) 1.5 8.0 1.0 9.0 ns
Propagation Delay, Direction or Output Enable to A

or B (Figure 2)
Propagation Delay, Direction or Output Enable to A

or B (Figure 2)
Propagation Delay, Direction or Output Enable to A

or B (Figure 2)
Propagation Delay, Direction or Output Enable to A

or B (Figure 2)
Maximum Input Capacitance 4.5 4.5 pF
Maximum Three-State I/O Capacitance

(I/O in High-Impedance State)

Power Dissipation Capacitance 45 pF

(VCC=5.0 V ± 10%, CL=50pF, Input tr=tf=3.0 ns)

Guaranteed Limits

25 °C-40

°

C to 85°C

Min Max Min Max

1.5 10.0 1.5 11.0 ns

1.5 10.0 1.5 12.0 ns

1.5 10.0 1.0 11.0 ns

2.0 10.0 1.5 11.0 ns

15 15 pF

Typical @25°C,VCC=5.0 V

Unit

334

Figure 1. Switching Waveforms Figure 2. Switching Waveforms

EXPANDED LOGIC DIAGRAM

IN74ACT245

335