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CD74HC251M 数据表(PDF) 1 Page - Texas Instruments |
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CD74HC251M 数据表(HTML) 1 Page - Texas Instruments |
1 / 7 page 1 Data sheet acquired from Harris Semiconductor SCHS169 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 VCC = 5V, CL = 15pF, TA = 25 oC • 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 ≤ 1µA at VOL, VOH 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 cir- cuits, 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 out- puts. The CD74HCT251 logic family is speed, function, and pin-compatible with the standard 74LS251. Pinout CD74HC251, CD74HCT251 (PDIP, SOIC) TOP VIEW Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. 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 or die for this part number is available which meets all elec- trical specifications. Please contact your local sales office or Harris customer service for ordering information. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 I3 I2 I1 I0 Y Y GND OE VCC I5 I6 I7 S0 S1 S2 I4 November 1997 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1997 CD74HC251, CD74HCT251 High Speed CMOS Logic 8-Input Multiplexer; Three-State File Number 1489.1 [ /Title (CD74 HC251 , CD74 HCT25 1) /Sub- ject (High Speed CMOS Logic 8-Input Multi- plexer; Three- |
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类似说明 - CD74HC251M |
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