CD74HC251

Manufacturer Part NumberCD74HC251
ManufacturerTexas Instruments
CD74HC251 datasheet
 


Specifications of CD74HC251

Technology FamilyHC  
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Data sheet acquired from Harris Semiconductor
SCHS169C
November 1997 - Revised October 2003
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
o
V
= 5V, C
= 15pF, T
= 25
C
CC
L
A
• 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
= 30%, N
IL
at V
= 5V
CC
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
V
= 0.8V (Max), V
= 2V (Min)
IL
IH
- CMOS Input Compatibility, I
l
Pinout
CD54HC251, CD54HCT251
(CERDIP)
CD74HC251, CD74HCT251
(PDIP, SOIC)
TOP VIEW
I
1
3
I
2
2
I
3
1
I
4
0
Y
5
Y
6
OE
7
GND
8
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
©
Copyright
2003, Texas Instruments Incorporated
CD54HC251, CD74HC251,
CD54HCT251, CD74HCT251
8-Input Multiplexer, Three-State
Description
The ’HC251 and ’HCT251 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 (Y)
outputs as well as an output enable (OE) input. The OE must
be at a low logic level to enable this device. When the OE
input is high, both outputs are in the high-impedance state.
o
o
C to 125
C
When enabled, address information on the data select inputs
determines which data input is routed to the Y and Y
outputs. The ’HCT251 logic family is speed, function, and
pin-compatible with the standard ’LS251.
Ordering Information
PART NUMBER
= 30% of V
IH
CC
CD54HC251F3A
CD54HCT251F3A
CD74HC251E
CD74HC251M
1 A at V
, V
CD74HC251MT
OL
OH
CD74HC251M96
CD74HCT251E
CD74HCT251M
CD74HCT251MT
CD74HCT251M96
NOTE: When ordering, use the entire part number. The suffix 96
16
V
CC
denotes tape and reel. The suffix T denotes a small-quantity reel of
250.
15
I
4
14
I
5
13
I
6
12
I
7
11
S0
10
S1
9
S2
1
High-Speed CMOS Logic
TEMP. RANGE
o
(
C)
PACKAGE
-55 to 125
16 Ld CERDIP
-55 to 125
16 Ld CERDIP
-55 to 125
16 Ld PDIP
-55 to 125
16 Ld SOIC
-55 to 125
16 Ld SOIC
-55 to 125
16 Ld SOIC
-55 to 125
16 Ld PDIP
-55 to 125
16 Ld SOIC
-55 to 125
16 Ld SOIC
-55 to 125
16 Ld SOIC

CD74HC251 Summary of contents

  • Page 1

    ... High Noise Immunity 30 • HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility 0.8V (Max (Min CMOS Input Compatibility Pinout CD54HC251, CD54HCT251 (CERDIP) CD74HC251, CD74HCT251 (PDIP, SOIC) TOP VIEW ...

  • Page 2

    ... CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 Functional Diagram SELECT High Voltage Level Low Voltage Level Don’t Care High Impedance (Off ...I = the level of the respective input CHANNEL 15 INPUTS ...

  • Page 3

    ... CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 Absolute Maximum Ratings DC Supply Voltage -0. Input Diode Current For V < -0. > 0. Output Diode Current For V < -0. > 0. Drain Current, per Output For -0.5V < V < V +0. Output Source or Sink Current per Output Pin, I For V > ...

  • Page 4

    ... CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 DC Electrical Specifications (Continued) CONDITIONS PARAMETER SYMBOL V (V) I Input Leakage Current GND Quiescent Device Current GND Three-State Leakage - Current HCT TYPES High Level Input Voltage Low Level Input Voltage ...

  • Page 5

    ... CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 Switching Specifications Input PARAMETER SYMBOL HC TYPES Propagation Delay t t PLH, PHL Select to Outputs Data to Outputs t t PLH, PHL Enable to High Z and Enable t t PLH, PHL from High Z Output Transition Time TLH THL Input Capacitance ...

  • Page 6

    ... CD54HC251, CD74HC251, CD54HCT251, CD74HCT251 Test Circuits and Waveforms t = 6ns r 90% INPUT 50% 10% t THL INVERTING OUTPUT t t PLH PHL FIGURE 1. HC TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC 6ns OUTPUT 90% DISABLE 50% t PLZ OUTPUT LOW TO OFF 10% t PHZ 90% OUTPUT HIGH TO OFF ...

  • Page 7

    ... ACTIVE PDIP CD74HC251EE4 ACTIVE PDIP CD74HC251M ACTIVE SOIC CD74HC251M96 ACTIVE SOIC CD74HC251M96E4 ACTIVE SOIC CD74HC251M96G4 ACTIVE SOIC CD74HC251ME4 ACTIVE SOIC CD74HC251MG4 ACTIVE SOIC CD74HC251MT ACTIVE SOIC CD74HC251MTE4 ACTIVE SOIC CD74HC251MTG4 ACTIVE SOIC CD74HCT251E ACTIVE PDIP CD74HCT251EE4 ACTIVE PDIP CD74HCT251M ACTIVE SOIC ...

  • Page 8

    Orderable Device (1) Package Type Package Status CD74HCT251M96G4 ACTIVE SOIC CD74HCT251ME4 ACTIVE SOIC CD74HCT251MG4 ACTIVE SOIC CD74HCT251MT ACTIVE SOIC CD74HCT251MTE4 ACTIVE SOIC CD74HCT251MTG4 ACTIVE SOIC (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for ...

  • Page 9

    ... OTHER QUALIFIED VERSIONS OF CD54HC251, CD54HCT251, CD74HC251, CD74HCT251 : • Catalog: CD74HC251, CD74HCT251 Military: CD54HC251, CD54HCT251 • NOTE: Qualified Version Definitions: Catalog - TI's standard catalog product • • Military - QML certified for Military and Defense Applications PACKAGE OPTION ADDENDUM Addendum-Page 3 5-Sep-2011 ...

  • Page 10

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing CD74HC251M96 SOIC D CD74HCT251M96 SOIC D PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 (mm) Diameter Width (mm) W1 (mm) 16 2500 330.0 16.4 6.5 16 2500 330.0 16.4 6.5 Pack Materials-Page 1 19-Mar-2008 B0 (mm) K0 (mm Pin1 ...

  • Page 11

    ... Device Package Type CD74HC251M96 SOIC CD74HCT251M96 SOIC PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2500 D 16 2500 Pack Materials-Page 2 19-Mar-2008 Width (mm) Height (mm) 333.2 345.9 28.6 333.2 345.9 28.6 ...

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  • Page 16

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...