Datasheet IN74ACT257N, IN74ACT257D Datasheet (INTEGRAL)

Quad 2-Input Data Selector/Multiplexer
with 3-State Outputs

High-Speed Silicon-Gate CMOS

The IN74ACT257 is identical in pinout to the LS/ALS257,
HC/HCT257. The IN74ACT257 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.

This device selects a (4-bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs
in noninverted from when the Output Enable pin is at a low level. A
high level on the Output Enable pin switches the outputs into the high­impedance state.

•

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

IN74ACT257

ORDERING INFORMATION

IN74ACT257N Plastic

IN74ACT257D SOIC

TA = -40° to 85° C for all

packages

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 16 =V

PIN 8 = GND

CC

FUNCTION TABLE

Inputs Outputs

Output
Enable

HXZ
LLA0-A3
LHB0-B3

X=don’t care
Z = high-impedance st ate
A0-A3,B0-B3=the levels of the respective
Nibble Inputs

Select Y0-Y3

361

IN74ACT257

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

).

362

IN74ACT257

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

±

0.5

°

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

±

5.0

Unit

V

V

V

V

µ

A

µ

A

µ

A

363

IN74ACT257

AC ELECTRICAL CHARACTERISTICS

Symbol Parameter

t

t

t

t

t

t

t

t

C

PLH

PHL

PLH

PHL

PZH

PZL

PHZ

PLZ

IN

Propagation Delay, Nibble A or B to Output Y
(Figure 1)

Propagation Delay, Nibble A or B to Output Y
(Figure 1)

Propagation Delay, Select to Output Y
(Figure 2)

Propagation Delay, Select to Output Y
(Figure 2)

Propagation Delay, Output Enable to Output Y
(Figure 3)

Propagation Delay, Output Enable to Output Y
(Figure 3)

Propagation Delay, Output Enable to Output Y
(Figure 3)

Propagation Delay, Output Enable to Output Y
(Figure 3)

Maximum Input Capacitance 4.5 4.5 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 7.0 1.0 7.5 ns

2.0 7.5 1.5 8.5 ns

2.0 9.5 1.5 10.5 ns

2.5 10.5 2.0 11.5 ns

2.0 8.0 1.5 9.0 ns

2.0 8.0 1.5 9.0 ns

2.5 9.0 1.5 10.0 ns

2.0 7.5 1.5 8.5 ns

Unit

Typical @25°C,VCC=5.0 V

C

PD

Power Dissipation Capacitance 50 pF

Figure 1. Switching Waveforms Figure 2. Switching Waveforms

364

Figure 3. Switching Waveforms

IN74ACT257

EXPANDED LOGIC DIAGRAM

365