SN74HC251DBE4 - Texas Instruments High-Performance Analog

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3-State Version of ’HC151

High-Current 3-State Outputs Interface

Directly With System Bus or Can Drive up

to 15 LSTTL Loads

Perform Parallel-to-Serial Conversion

Complementary Outputs Provide True and

Inverted Data

Package Options Include Plastic

Small-Outline (D), Shrink Small-Outline

(DB), and Ceramic Flat (W) Packages,

Ceramic Chip Carriers (FK), and Standard

Plastic (N) and Ceramic (J) DIPs

description

These data selectors/multiplexers contain full

binary decoding to select 1-of-8 data sources and

feature strobe-controlled complementary 3-state

outputs.

The 3-state outputs can interface with and drive

data lines of bus-organized systems. With all but

one of the common outputs disabled (in the

high-impedance state), the low impedance of the

single enabled output drives the bus line to a high

or low logic level. Both outputs are controlled by

the output-enable (OE) input. The outputs are

disabled when OE is high.

The SN54HC251 is characterized for operation

over the full military temperature range of –55°C

to 125°C. The SN74HC251 is characterized for

operation from –40°C to 85 °C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SN54HC251 ...J OR W PACKAGE

SN74HC251 . . . D, DB, OR N PACKAGE

(TOP VIEW)

3212019

910111213

SN54HC251 . . . FK PACKAGE

(TOP VIEW)

BD4

GND

NC VCC

GND

VCC

NC – No internal connection

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

On products compliant to MIL-PRF-38535, all parameters are tested

unless otherwise noted. On all other products, production

processing does not necessarily include testing of all parameters.

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

FUNCTION TABLE

INPUTS OUTPUTS

SELECT

C B A

X X X H Z Z

LLLLD0 D0

LLHLD1 D1

LHLLD2 D2

LHHLD3 D3

HLLLD4 D4

HLHLD5 D5

HHLLD6 D6

H H H L D7 D7

D0, D1 . . . D7 = the level of the respective D input

logic symbol†

MUX

A10

†This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, DB, J, N, and W packages.

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic diagram (positive logic)

Pin numbers shown are for the D, DB, J, N, and W packages.

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range†

Supply voltage range, VCC –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input clamp current, IIK (VI < 0 or VI > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output clamp current, IOK (VO < 0 or VO > VCC) (see Note 1) ±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous output current, IO (VO = 0 to VCC) ±35 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous current through VCC or GND ±70 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Note 2): D package 113°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

DB package 131°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 78°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, Tstg –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.

NOTES: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace

length of zero.

recommended operating conditions (see Note 3)

SN54HC251 SN74HC251

UNIT

MIN NOM MAX MIN NOM MAX

UNIT

VCC Supply voltage 2 5 6 2 5 6 V

VCC = 2 V 1.5 1.5

VIH High-level input voltage VCC = 4.5 V 3.15 3.15 V

VCC = 6 V 4.2 4.2

VCC = 2 V 0 0.5 0 0.5

VIL Low-level input voltage VCC = 4.5 V 0 1.35 0 1.35 V

VCC = 6 V 0 1.8 0 1.8

VIInput voltage 0 VCC 0 VCC V

VOOutput voltage 0 VCC 0 VCC V

VCC = 2 V 0 1000 0 1000

ttInput transition (rise and fall) time VCC = 4.5 V 0 500 0 500 ns

VCC = 6 V 0 400 0 400

TAOperating free-air temperature –55 125 –40 85 °C

NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report,

Implications of Slow or Floating CMOS Inputs

, literature number SCBA004.

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range (unless

otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

TA = 25°C SN54HC251 SN74HC251

UNIT

PARAMETER

TEST

CONDITIONS

CC MIN TYP MAX MIN MAX MIN MAX

UNIT

2 V 1.9 1.998 1.9 1.9

IOH = –20 µA4.5 V 4.4 4.499 4.4 4.4

VOH VI = VIH or VIL 6 V 5.9 5.999 5.9 5.9 V

IOH = –6 mA 4.5 V 3.98 4.3 3.7 3.84

IOH = –7.8 mA 6 V 5.48 5.8 5.2 5.34

2 V 0.002 0.1 0.1 0.1

IOL = 20 µA4.5 V 0.001 0.1 0.1 0.1

VOL VI = VIH or VIL 6 V 0.001 0.1 0.1 0.1 V

IOL = 6 mA 4.5 V 0.17 0.26 0.4 0.33

IOL = 7.8 mA 6 V 0.15 0.26 0.4 0.33

IIVI = VCC or 0 6 V ±0.1 ±100 ±1000 ±1000 nA

IOZ VO = VCC or 0, VI = VIH or VIL 6 V ±0.01 ±0.5 ±10 ±5µA

ICC VI = VCC or 0, IO = 0 6 V 8 160 80 µA

Ci2 V to 6 V 3 10 10 10 pF

switching characteristics over recommended operating free-air temperature range, CL = 50 pF

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM TO

VCC

TA = 25°C SN54HC251 SN74HC251

UNIT

PARAMETER

(INPUT) (OUTPUT)

CC MIN TYP MAX MIN MAX MIN MAX

UNIT

2 V 58 205 300 256

A, B, or C W or Y 4.5 V 21 41 60 51

6 V 19 35 51 44

pd 2 V 44 195 283 244

Any D W or Y 4.5 V 17 39 57 49

6 V 15 33 48 41

2 V 30 145 210 181

ten OE W or Y 4.5 V 10 29 42 36 ns

6 V 9 25 36 31

2 V 25 195 283 244

tdis OE W or Y 4.5 V 15 39 57 49 ns

6 V 14 33 48 41

2 V 20 75 110 95

ttW or Y 4.5 V 8 15 22 19 ns

6 V 6 13 19 16

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics over recommended operating free-air temperature range, CL = 150 pF

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM TO

VCC

TA = 25°C SN54HC251 SN74HC251

UNIT

PARAMETER

(INPUT) (OUTPUT)

CC MIN TYP MAX MIN MAX MIN MAX

UNIT

2 V 72 300 450 375

A, B, or C W or Y 4.5 V 25 60 90 75

6 V 22 52 77 65

pd 2 V 59 300 450 375

Any D W or Y 4.5 V 21 60 90 75

6 V 18 52 77 65

2 V 50 230 340 285

ten OE W or Y 4.5 V 17 46 68 57 ns

6 V 15 40 58 50

2 V 45 210 315 265

ttW or Y 4.5 V 17 42 63 53 ns

6 V 13 36 53 45

operating characteristics, TA = 25°C

PARAMETER TEST CONDITIONS TYP UNIT

Cpd Power dissipation capacitance No load 70 pF

SN54HC251, SN74HC251

DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SCLS132C – DECEMBER 1982 – REVISED FEBRUAR Y 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

PARAMETER MEASUREMENT INFORMATION

50%

VOLTAGE WAVEFORM

INPUT RISE AND FALL TIMES

50%50% 10%10% 90% 90% VCC

0 V

trtf

Input

VOLTAGE WAVEFORMS

PROPAGATION DELAY AND OUTPUT TRANSITION TIMES

50%

10%10% 90% 90%

VCC

VOH

VOL

0 V

trtf

Input

In-Phase

Output

50%

tPLH tPHL

50% 50%

10% 10% 90%90% VOH

VOL

tPHL tPLH

Out-of-Phase

Output

50%

10%

90%

VCC

≈VCC

VOL

0 V

Output

Control

(Low-Level

Enabling)

Output

W aveform 1

(See Note B)

50%

tPZL tPLZ

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS

VOH

≈0 V

50%

tPZH

tPHZ

Output

W aveform 2

(See Note B)

≈VCC

Test

Point

From Output

Under Test

(see Note A)

VCC

LOAD CIRCUIT

PARAMETER CL

tPZH

tpd or tt

tdis

ten tPZL

tPHZ

tPLZ

1 kΩ

50 pF

150 pF

50 pF

Open Closed

RLS1

Closed Open

Open Closed

Closed Open

50 pF

150 pF Open Open––

NOTES: A. CL includes probe and test-fixture capacitance.

B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. Phase relationships between waveforms were chosen arbitrarily . All input pulses are supplied by generators having the following

characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.

D. The outputs are measured one at a time with one input transition per measurement.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

Figure 1. Load Circuit and Voltage Waveforms

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Product Folder: SN74HC251, Data Selectors/Multiplexers With 3-State Outputs
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PRODUCT SUPPORT: TRAINING
SN74HC251, Data Selectors/Multiplexers With 3-State Outputs
DEVICE STATUS: ACTIVE
PARAMETER NAME SN54HC251 SN74HC251
Voltage Nodes (V) 6, 5, 2 6, 5, 2
Vcc range (V) 2.0 to 6.0 2.0 to 6.0
Input Level CMOS CMOS
Output Level CMOS CMOS
Output Drive (mA)  -6/6
Output 3S 3S
From 8 8
To 1 1
FEATURES Back to Top
●     3-State Version of 'HC151
●     High-Current 3-State Outputs Interface Directly With System Bus or Can Drive up to 15 LSTTL Loads
●     Perform Parallel-to-Serial Conversion
●     Complementary Outputs Provide True and Inverted Data
●     Package Options Include Plastic Small-Outline (D), Shrink Small-Outline (DB), and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs 
DESCRIPTION Back to Top
These data selectors/multiplexers contain full binary decoding to select 1-of-8 data sources and feature strobe-controlled complementary 3-state outputs. 
The 3-state outputs can interface with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (in the high-impedance state), the low impedance of the 
single enabled output drives the bus line to a high or low logic level. Both outputs are controlled by the output-enable (OE\) input. The outputs are disabled when OE\ is high. 
The SN54HC251 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74HC251 is characterized for operation from -40°C to 85 °C. 
D0, D1...D7 = the level of the respective D input 
TECHNICAL DOCUMENTS Back to Top
To view the following documents, Acrobat Reader 4.0 is required.
To download a document to your hard drive, right-click on the link and choose 'Save'. 
DATASHEET Back to Top
Full datasheet in Acrobat PDF: sn74hc251.pdf (120 KB,Rev.C) (Updated: 02/01/1999)
APPLICATION NOTES Back to Top
View Application Notes for Digital Logic
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Product Folder: SN74HC251, Data Selectors/Multiplexers With 3-State Outputs
●     CMOS Power Consumption and CPD Calculation (Rev. B) (SCAA035B - Updated: 06/01/1997)
●     Designing With Logic (Rev. C) (SDYA009C - Updated: 06/01/1997)
●     Evaluation of Nickel/Palladium/Gold-Finished Surface-Mount Integrated Circuits (SZZA026 - Updated: 06/20/2001)
●     Implications of Slow or Floating CMOS Inputs (Rev. C) (SCBA004C - Updated: 02/01/1998)
●     Input and Output Characteristics of Digital Integrated Circuits (SDYA010 - Updated: 10/01/1996)
●     Live Insertion (SDYA012 - Updated: 10/01/1996)
●     SN54/74HCT CMOS Logic Family Applications and Restrictions (SCLA011 - Updated: 05/01/1996)
●     Selecting the Right Texas Instruments Signal Switch (SZZA030 - Updated: 09/07/2001)
●     Using High Speed CMOS and Advanced CMOS in Systems With Multiple Vcc (SCLA008 - Updated: 04/01/1996)
RELATED DOCUMENTS Back to Top
View Related Documentation for Digital Logic
●     Logic Reference Guide (SCYB004, 1032 KB - Updated: 10/23/2001)
●     Logic Selection Guide Second Half 2002 (Rev. R) (SDYU001R, 4274 KB - Updated: 07/19/2002)
●     Military Semiconductors Selection Guide 2002 (Rev. B) (SGYC003B, 1648 KB - Updated: 04/22/2002)
SAMPLES Back to Top
ORDERABLE DEVICE PACKAGE
INDUSTRY (TI) PINS TEMP (ºC) STATUS PRODUCT CONTENT SAMPLES
SN74HC251D SOP
(D) 16 -40 TO 85 ACTIVE View Product Content Request Samples
PRICING/AVAILABILITY/PKG Back to Top
DEVICE INFORMATION
ORDERABLE 
DEVICE STATUS PACKAGE
TYPE|PINS TEMP (ºC) PRODUCT 
CONTENT
BUDGETARY 
PRICING
QTY | $US
STD
PACK
QTY
SN74HC251D ACTIVE SOP
(D) | 16 -40 TO 85 View Contents 1KU | 0.29 40
             
             
SN74HC251DBR ACTIVE SSOP
(DB) | 16 -40 TO 85 View Contents 1KU | 0.29 2000
SN74HC251DR ACTIVE SOP
(D) | 16 -40 TO 85 View Contents 1KU | 0.29 2500
             
SN74HC251N ACTIVE PDIP
(N) | 16 -40 TO 85 View Contents 1KU | 0.29 25
             
             
             
  
TI INVENTORY STATUS
AS OF 3:00 PM GMT, 26 Sep 2002
IN STOCK IN PROGRESS
QTY|DATE LEAD TIME
N/A* 1920 | 03 Oct 2 WKS
  8040 | 08 Oct  
  8080 | 30 Oct  
N/A*  6 WKS
N/A* 5000 | 11 Oct 3 WKS
  5000 | 30 Oct  
N/A* 50 | 30 
Sep 3 WKS
  3900 | 14 Oct  
  100 | 21 Oct  
  >10k | 28 Oct  
  
REPORTED DISTRIBUTOR INVENTORY
AS OF 3:00 PM GMT, 26 Sep 2002
DISTRIBUTOR
COMPANY|REGION IN STOCK PURCHASE
Avnet | AMERICA >1k
DigiKey | AMERICA 745
   
   
   
   
Avnet | AMERICA >1k
   
   
   
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Product Folder: SN74HC251, Data Selectors/Multiplexers With 3-State Outputs

SN74HC251NSR ACTIVE SOP

(NS) | 16 -40 TO 85 View Contents 1KU | 0.43 2000

SN74HC251PWR ACTIVE TSSOP

(PW) | 16 View Contents 1KU | 0.29 2000

N/A* 6 WKS

Table Data Updated on: 9/26/2002

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