CD74HC257 TI | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

Features

  • Buffered Inputs
  • Typical Propagation Delay ( In to Output ) = 12ns at VCC = 5V, CL = 15pF, TA = 25oC
  • Fanout (Over Temperature Range)
  • Wide Operating Temperature Range . . . -55oC to 125oC
  • Balanced Propagation Delay and Transition Times
  • Significant Power Reduction Compared to LSTTL Logic ICs
  • HC Types - 2V to 6V Operation - High Noise Immunity: N IL = 30%, NIH = 30% of VCC at VCC = 5V
  • HCT Types - 4.5V to 5.5V Operation - Direct LSTTL Input Logic Compatibility, V IL= 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il£ 1mA at VOL , VOH

Description

The Harris CD74HC257 and CD74HCT257 are quad 2-input multiplexers which select four bits of data from two sources under the control of a common Select Input (S). The Output Enable input ( OE) is active LOW. WhenOE is HIGH, all of the outputs (1Y -4Y) are in the high impedance state regard- less of all other input conditions. Moving data from two groups of registers to four common output busses is a common use of the 257. The state of the Select input determines the particular register from which the data comes. It can also be used as a function generator. Pinout CD74HC257, CD74HC257 (PDIP, SOIC) TOP VIEW

Ordering Information

TEMP. RANGE (oC) PACKAGE PKG. NO. CD74HC257E -55 to 125 16 Ld PDIP E16.3 CD74HCT257E -55 to 125 16 Ld PDIP E16.3 CD74HC257M -55 to 125 16 Ld SOIC M16.15 CD74HCT257M -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 electrical specifications. Please contact your local sales office or Harris customer service for ordering information. S 1I0 1I1 2I0 2I1 GND VCC 4I0 4I1 3I0 3I1 OE November 1997 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1997 CD74HC257, CD74HCT257 High Speed CMOS Logic Quad 2-Input Multiplexer with Three-State Non-Inverting Outputs File Number 1650.1 [ /Title (CD74 HC257 CD74 HCT25 /Sub- ject (High Speed CMOS Logic Quad 2-Input Multi- plexer

3 CIRCUITS IDENTICAL TO CIRCUIT

S 4I1 4I0 3I1 3I0 2I1 2I0 1I1 1I0 P N TRUTH TABLE OUTPUT ENABLE SELECT INPUT DATA INPUTS OUTPUT OE S I 0 I1 Y HXXXZ LLLXL L LHXH LHXLL LHXHH NOTE: H = High Voltage Level L = Low Voltage Level X = Don’t Care Z = High Impedance, OFF State CD74HC257, CD74HCT257

Absolute Maximum Ratings Thermal Information DC Input Diode Current, IIK DC Output Diode Current, IOK DC Drain Current, per Output, IO DC Output Source or Sink Current per Output Pin, IO Operating Conditions Supply Voltage Range, VCC DC Input or Output Voltage, V Input Rise and Fall Time Thermal Resistance (Typical, Note 3) q JA (oC/W) (SOIC - Lead Tips Only) 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. qJA is measured with the component mounted on an evaluation PC board in free air. PARAMETER SYMBOL TEST CONDITIONS VCC (V) 25oC -40 oC TO 85oC -55 oC TO 125oC UNITSVI(V) I O (mA) MIN TYP MAX MIN MAX MIN MAX HC TYPES High Level Input Voltage V Low Level Input Voltage High Level Output Voltage CMOS Loads V OH VIH or VIL High Level Output Voltage TTL Loads Low Level Output Voltage CMOS Loads V OL VIH or VIL Low Level Output Voltage TTL Loads Input Leakage Current I I VCC or GND CD74HC257, CD74HCT257

VIH - - 4.5 to 5.5 2-- 2 - 2 - V Low Level Input Voltage VIL - - 4.5 to 5.5 High Level Output Voltage CMOS Loads V OH VIH or VIL High Level Output Voltage TTL Loads Low Level Output Voltage CMOS Loads V OL VIH or VIL Low Level Output Voltage TTL Loads Input Leakage Current I I VCC to GND Quiescent Device Current ICC VCC or GND 0 5.5 - - 8 - 80 - 160 mA Additional Quiescent Device Current Per Input Pin: 1 Unit Load (Note 4) DI CC VCC -2.1 - 4.5 to 5.5 - 100 360 - 450 - 490 mA Three-State Leakage Current IOZ VIL or VIH NOTE: PARAMETER SYMBOL TEST CONDITIONS VCC (V) 25oC -40 oC TO 85oC -55 oC TO 125oC UNITSVI(V) I O (mA) MIN TYP MAX MIN MAX MIN MAX HCT Input Loading Table INPUT UNIT LOADS Data 0.95 OE 0.6 NOTE: Unit Load isDICC limit specified in DC Electrical Specifications table, e.g., 360mA max at 25oC. CD74HC257, CD74HCT257

Switching SpecificationsInput tr, tf = 6ns PARAMETER SYMBOL TEST CONDITIONS V CC (V) 25oC -40 oC TO 85oC -55 oC TO 125oC UNITSTYP MAX MAX MAX HC TYPES Propagation Delay In to Y tPLH , tPHL C L = 50pF 2 - 150 190 225 ns 4.5 - 30 38 45 ns C L = 15pF 5 12 - - - ns CL = 50pF 6 - 26 33 38 ns Propagation Delay S to Y tPLH , tPHL C L = 50pF 2 - 175 220 265 ns 4.5 - 35 44 53 ns C L = 15pF 5 14 - - - ns CL = 50pF 6 - 30 37 45 ns Propagation Delay OE to Y tPLZ , tPHZ , tPZL , tPZH CL = 50pF 2 - 150 190 225 ns C L = 50pF 4.5 - 30 38 45 ns C L = 15pF 5 12 - - - ns CL = 50pF 6 - 26 33 38 ns Output Transition Times t TLH , tTHL C L = 50pF 2 - 60 75 90 ns 4.5 - 12 15 18 ns 6 - 10 13 15 ns Input Capacitance C I -- - 1 0 1 0 1 0 p F Three-State Output Capacitance C O -- - 2 0 2 0 2 0 p F Power Dissipation Capacitance (Notes 5, 6) C PD - 5 45 - - - pF HCT TYPES Propagation Delay In to Y tPLH , tPHL C L = 50pF 4.5 - 33 41 50 ns C L = 15pF 5 13 - - - ns Propagation Delay S to Y tPZL, tPZH C L = 50pF 4.5 - 38 48 57 ns C L = 15pF 5 12 - - - ns Propagation Delay OE to Y tPLZ , tPHZ C L = 50pF 4.5 - 30 38 45 ns C L = 15pF 5 16 - - - ns Output Transition Times t TLH , tTHL C L = 50pF 4.5 - 12 15 18 ns Input Capacitance C I -- - 1 0 1 0 1 0 p F Three-State Output Capacitance C O -- - 2 0 2 0 2 0 p F Power Dissipation Capacitance (Notes 5, 6) C PD - 5 45 - - - pF NOTES: 5. CPD is used to determine the dynamic power consumption, per multiplexer. 6. PD = VCC 2 fi(CPD + CL) where fi = Input Frequency, CL = Output Load Capacitance, VCC = Supply Voltage. CD74HC257, CD74HCT257

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 APPLICATIONS. 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. Copyright  1998, Texas Instruments Incorporated