Texas Instruments CD74HCT251M96, CD74HCT251M, CD74HCT251E, CD74HC251M96, CD74HC251M Datasheet

CD74HC251,

/
j

[ /Title
(CD74
HC251
,
CD74
HCT25

1)
Sub­ect

(High
Speed
CMOS
Logic
8-Input
Multi­plexer;
Three-

Data sheet acquired from Harris Semiconductor
SCHS169

November 1997

Features

• Selects One of Eight Binary Data Inputs

• Three-State Output Capability

• True and Complement Outputs

• Typical (Data to Output) Propagation Delay of 14ns at
= 5V, CL = 15pF, TA = 25oC

V

CC

• Fanout (Over Temperature Range)

- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads

- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55

• Balanced Propagation Delay and Transition Times

• Significant Power Reduction Compared to LSTTL

Logic ICs

• Alternate Source is Philips

- HC Types

- 2V to 6V Operation

- High Noise Immunity: N
at VCC = 5V

• HCT Types

- 4.5V to 5.5V Operation

- Direct LSTTL Input Logic Compatibility,
V

= 0.8V (Max), VIH = 2V (Min)

IL

- CMOS Input Compatibility, I

= 30%, NIH = 30% of V

IL

≤ 1µA at VOL, V

l

o

C to 125oC

OH

CD74HCT251

High Speed CMOS Logic

8-Input Multiplexer; Three-State

Description

The Harris CD74HC251 and CD74HCT251 are 8-channel
digital multiplexers with three-state outputs, fabricated with
high-speed silicon-gate CMOS technology.Together with the
low power consumption of standard CMOS integrated cir­cuits, they possess the ability to drive 10 LSTTL loads. The
three-state feature makes them ideally suited for interfacing
with bus lines in a bus-oriented system.

This multiplexer features both true (Y) and complement (
outputs as well as an output enable (
be at a low logic level to enable this device. When the
input is high, both outputs are in the high-impedance state.
When enabled, address information on the data select inputs
determines which data input is routed to the Y and
puts. The CD74HCT251 logic family is speed, function, and
pin-compatible with the standard 74LS251.

Ordering Information

PART NUMBER TEMP. RANGE (oC) PACKAGE

CC

CD74HC251E -55 to 125 16 Ld PDIP E16.3
CD74HCT251E -55 to 125 16 Ld PDIP E16.3
CD74HC251M -55 to 125 16 Ld SOIC M16.15
CD74HCT251M -55 to 125 16 Ld SOIC M16.15

NOTES:

1. When ordering,use the entire part number. Add the suffix 96 to
obtain the variant in the tape and reel.

2. Wafer ordie for thispart number isavailable which meetsallelec­trical specifications. Please contact your local sales office or
Harris customer service for ordering information.

OE) input. The OE must

Y)

OE

Y out-

PKG.

NO.

Pinout

CD74HC251, CD74HCT251

(PDIP, SOIC)

TOP VIEW

16

1

I

3

2

I

2

3

I

1

4

I

0

5

Y

6

Y

7

OE

8

GND

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright

© Harris Corporation 1997

1

V

CC

15

I

4

14

I

5

13

I

6

12

I

7

11

S0
S1

10

S2

9

File Number 1489.1

Functional Diagram

CD74HC251, CD74HCT251

CHANNEL

SELECT

OE

INPUTS

DAT A

SELECT

I

0

I

1

I

2

I

3

15

I

4

14

I

5

13

I

6

12

I

7

11

S

0

10

S

1

S

2

7

4
3
2

1

5

Y

OUTPUTS

6

Y

9

TRUTH TABLE

INPUTS OUTPUT

OUTPUT

CONTROL OE Y YS2 S1 S0

XXX H ZZ
LLL L I
LLH L I
LHL L I
LHH L I
HLL L I
HLH L I
HHL L I
HHH L I

0

1

2

3

4

5

6

7

I

0

I

1

I

2

I

3

I

4

I

5

I

6

I

7

NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care, Z = High Imped­ance (Off), I0, I1...I7 = the level of the respective input.

2

CD74HC251, CD74HCT251

Absolute Maximum Ratings Thermal Information

DC Supply Voltage, VCC. . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V

DC Input Diode Current, I

For VI < -0.5V or VI > VCC + 0.5V. . . . . . . . . . . . . . . . . . . . . .±20mA

DC Output Diode Current, I

For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±20mA

DC Drain Current, per Output, I

For -0.5V < VO < VCC +0.5V . . . . . . . . . . . . . . . . . . . . . . . . . .±25mA

DC Output Source or Sink Current per Output Pin, I

For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA

DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±50mA

IK

OK

O

O

Operating Conditions

Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC

Supply Voltage Range, V

HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V

HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V

DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to V

Input Rise and Fall Time

2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max)

4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max)

6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max)

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

3. θJA is measured with the component mounted on an evaluation PC board in free air.

CC

Thermal Resistance (Typical, Note 3) θJA (oC/W)

PDIP Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Maximum Junction Temperature. . . . . . . . . . . . . . . . . . . . . . .150oC

Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC

Maximum Lead Temperature (Soldering 10s). . . . . . . . . . . . .300oC

(SOIC - Lead Tips Only)

CC

DC Electrical Specifications

PARAMETER SYMBOL

HC TYPES

High Level Input
Voltage

Low Level Input
Voltage

High Level Output
Voltage
CMOS Loads

High Level Output
Voltage
TTL Loads

Low Level Output
Voltage
CMOS Loads

Low Level Output
Voltage
TTL Loads

V

IH

V

IL

V

OH

V

OL

TEST

CONDITIONS

- - 2 1.5 - - 1.5 - 1.5 - V

- - 2 - - 0.5 - 0.5 - 0.5 V

VIHor VIL-0.02 2 1.9 - - 1.9 - 1.9 - V

-0.02 4.5 4.4 - - 4.4 - 4.4 - V

-0.02 6 5.9 - - 5.9 - 5.9 - V

- - ---- - - - V

-4 4.5 3.98 - - 3.84 - 3.7 - V

-5.2 6 5.48 - - 5.34 - 5.2 - V

VIHor VIL0.02 2 - - 0.1 - 0.1 - 0.1 V

0.02 4.5 - - 0.1 - 0.1 - 0.1 V

0.02 6 - - 0.1 - 0.1 - 0.1 V

- - ---- - - - V

4 4.5 - - 0.26 - 0.33 - 0.4 V

5.2 6 - - 0.26 - 0.33 - 0.4 V

V

CC

(V)

4.5 3.15 - - 3.15 - 3.15 - V
6 4.2 - - 4.2 - 4.2 - V

4.5 - - 1.35 - 1.35 - 1.35 V
6 - - 1.8 - 1.8 - 1.8 V

25oC -40oC TO 85oC -55oCTO125oC

UNITSVI(V) IO(mA) MIN TYP MAX MIN MAX MIN MAX

3