CD74HC251| Datasheet

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CD54HC251, CD74HC251, CD54HCT251, CD74HCT251
Data sheet acquired from Harris Semiconductor SCHS169C

November 1997 - Revised October 2003

High-Speed CMOS Logic 8-Input Multiplexer, Three-State
Description
The 'HC251 and 'HCT251 are 8-channel digital multiplexers with three-state outputs, fabricated with high-speed silicongate 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. 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.

Features
Selects One of Eight Binary Data Inputs

[ /Title (CD74 HC251 , CD74 HCT25 1) /Subject (High Speed CMOS Logic 8-Input Multiplexer; Three-

Three-State Output Capability True and Complement Outputs Typical (Data to Output) Propagation Delay of 14ns at VCC = 5V, CL = 15pF, TA = 25oC Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads Wide Operating Temperature Range . . . -55oC to 125oC 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: NIL = 30%, NIH = 30% of VCC at VCC = 5V HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il 1uA at VOL, VOH

Ordering Information
PART NUMBER CD54HC251F3A CD54HCT251F3A CD74HC251E CD74HC251M CD74HC251MT CD74HC251M96 TEMP. RANGE (oC) -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 -55 to 125 PACKAGE 16 Ld CERDIP 16 Ld CERDIP 16 Ld PDIP 16 Ld SOIC 16 Ld SOIC 16 Ld SOIC 16 Ld PDIP 16 Ld SOIC 16 Ld SOIC 16 Ld SOIC

Pinout
CD54HC251, CD54HCT251 (CERDIP) CD74HC251, CD74HCT251 (PDIP, SOIC) TOP VIEW
I3 1 I2 2 I1 3 I0 4 Y 5 Y 6 OE 7 GND 8 16 VCC 15 I4 14 I5 13 I6 12 I7 11 S0 10 S1 9 S2

CD74HCT251E CD74HCT251M CD74HCT251MT CD74HCT251M96

NOTE: When ordering, use the entire part number. The suffix 96 denotes tape and reel. The suffix T denotes a small-quantity reel of 250.

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

2003, Texas Instruments Incorporated