[ /Title (CD74 HC251 , CD74 HCT25 1) /Subject (High Speed CMOS Logic 8-Input Multiplexer; Three- CD74HC251, CD74HCT251 Data sheet acquired from Harris Semiconductor SCHS169 High Speed CMOS Logic 8-Input Multiplexer; Three-State November 1997 Features Description • Selects One of Eight Binary Data Inputs 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 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. • 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 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 CD74HCT251 logic family is speed, function, and pin-compatible with the standard 74LS251. • Wide Operating Temperature Range . . . -55oC to 125oC • Balanced Propagation Delay and Transition Times • Significant Power Reduction Compared to LSTTL Logic ICs Ordering Information • Alternate Source is Philips - HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V PART NUMBER • 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 TEMP. RANGE (oC) PKG. NO. PACKAGE 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 electrical specifications. Please contact your local sales office or Harris customer service for ordering information. Pinout CD74HC251, CD74HCT251 (PDIP, SOIC) TOP VIEW I3 1 16 VCC I2 2 15 I4 I1 3 14 I5 I0 4 13 I6 Y 5 12 I7 Y 6 11 S0 OE 7 10 S1 GND 8 9 S2 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1997 1 File Number 1489.1 CD74HC251, CD74HCT251 Functional Diagram OE 7 I0 I1 I2 CHANNEL INPUTS I3 I4 I5 I6 I7 S0 4 3 2 1 15 14 5 13 12 6 Y OUTPUTS Y 11 10 DATA S1 SELECT 9 S2 TRUTH TABLE INPUTS OUTPUT SELECT S2 S1 S0 OUTPUT CONTROL OE Y Y X X X H Z Z L L L L I0 I0 L L H L I1 I1 L H L L I2 I2 L H H L I3 I3 H L L L I4 I4 H L H L I5 I5 H H L L I6 I6 H H H L I7 I7 NOTE: H = High Voltage Level, L = Low Voltage Level, X = Don’t Care, Z = High Impedance (Off), I0, I1...I7 = the level of the respective input. 2 CD74HC251, CD74HCT251 Absolute Maximum Ratings Thermal Information DC Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V DC Input Diode Current, IIK For VI < -0.5V or VI > VCC + 0.5V . . . . . . . . . . . . . . . . . . . . . .±20mA DC Output Diode Current, IOK For VO < -0.5V or VO > VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±20mA DC Drain Current, per Output, IO For -0.5V < VO < VCC +0.5V . . . . . . . . . . . . . . . . . . . . . . . . . .±25mA DC Output Source or Sink Current per Output Pin, IO For VO > -0.5V or VO < VCC + 0.5V . . . . . . . . . . . . . . . . . . . .±25mA DC VCC or Ground Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . .±50mA Thermal Resistance (Typical, Note 3) θJA (oC/W) PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90 SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . . . .-65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only) Operating Conditions Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC Supply Voltage Range, VCC HC Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2V to 6V HCT Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.5V to 5.5V DC Input or Output Voltage, VI, VO . . . . . . . . . . . . . . . . . 0V to VCC Input Rise and Fall Time 2V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000ns (Max) 4.5V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500ns (Max) 6V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400ns (Max) 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. θJA is measured with the component mounted on an evaluation PC board in free air. DC Electrical Specifications TEST CONDITIONS PARAMETER 25oC -40oC TO 85oC -55oC TO 125oC SYMBOL VI (V) IO (mA) VCC (V) VIH - - 2 1.5 - - 1.5 - 1.5 - V 4.5 3.15 - - 3.15 - 3.15 - V 6 4.2 - - 4.2 - 4.2 - V 2 - - 0.5 - 0.5 - 0.5 V 4.5 - - 1.35 - 1.35 - 1.35 V 6 - - 1.8 - 1.8 - 1.8 V -0.02 2 1.9 - - 1.9 - 1.9 - V -0.02 4.5 4.4 - - 4.4 - 4.4 - V -0.02 6 5.9 - - 5.9 - 5.9 - V - - - - - - - - - V -4 4.5 3.98 - - 3.84 - 3.7 - V -5.2 6 5.48 - - 5.34 - 5.2 - V 0.02 2 - - 0.1 - 0.1 - 0.1 V 0.02 4.5 - - 0.1 - 0.1 - 0.1 V 0.02 6 - - 0.1 - 0.1 - 0.1 V - - - - - - - - - V 4 4.5 - - 0.26 - 0.33 - 0.4 V 5.2 6 - - 0.26 - 0.33 - 0.4 V MIN TYP MAX MIN MAX MIN MAX UNITS HC TYPES High Level Input Voltage Low Level Input Voltage High Level Output Voltage CMOS Loads VIL VOH - VIH or VIL High Level Output Voltage TTL Loads Low Level Output Voltage CMOS Loads Low Level Output Voltage TTL Loads VOL VIH or VIL - 3 CD74HC251, CD74HCT251 DC Electrical Specifications (Continued) TEST CONDITIONS 25oC -40oC TO 85oC -55oC TO 125oC SYMBOL VI (V) IO (mA) VCC (V) II VCC or GND - 6 - - ±0.1 - ±1 - ±1 µA ICC VCC or GND 0 6 - - 8 - 80 - 160 µA - VIL or VIH VO = VCC or GND 6 - - ±0.5 - ±5.0 - ±10 µA High Level Input Voltage VIH - - 4.5 to 5.5 2 - - 2 - 2 - V Low Level Input Voltage VIL - - 4.5 to 5.5 - - 0.8 - 0.8 - 0.8 V High Level Output Voltage CMOS Loads VOH VIH or VIL -0.02 4.5 4.4 - - 4.4 - 4.4 - V -4 4.5 3.98 - - 3.84 - 3.7 - V 0.02 4.5 - - 0.1 - 0.1 - 0.1 V 4 4.5 - - 0.26 - 0.33 - 0.4 V ±0.1 - ±1 - ±1 µA PARAMETER Input Leakage Current Quiescent Device Current Three-State Leakage Current MIN TYP MAX MIN MAX MIN MAX UNITS HCT TYPES High Level Output Voltage TTL Loads Low Level Output Voltage CMOS Loads VOL VIH or VIL Low Level Output Voltage TTL Loads Input Leakage Current II VCC and GND 0 5.5 - ICC VCC or GND 0 5.5 - - 8 - 80 - 160 µA Three-State Leakage Current - VIL or VIH VO = VCC or GND 6 - - ±0.5 - ±5.0 - ±10 µA Additional Quiescent Device Current Per Input Pin: 1 Unit Load ∆ICC VCC -2.1 - 4.5 to 5.5 - 100 360 - 450 - 490 µA Quiescent Device Current NOTE: For dual-supply systems theoretical worst case (VI = 2.4V, VCC = 5.5V) specification is 1.8mA. HCT Input Loading Table INPUT UNIT LOADS S0, S1, S2 0.55 I0 - I7 0.5 OE 2.65 NOTE: Unit Load is ∆ICC limit specified in DC Electrical Table, e.g., 360µA max at 25oC. 4 CD74HC251, CD74HCT251 Switching Specifications Input tr, tf = 6ns PARAMETER TEST CONDITIONS -40oC TO 85oC 25oC -55oC TO 125oC VCC (V) MIN TYP MAX MIN MAX MIN MAX UNITS 2 - - 245 - 305 - 370 ns 4.5 - - 49 - 61 - 74 ns CL =15pF 5 - 21 - - - - - ns CL = 50pF 6 - - 42 - 52 - 63 ns tPLH, tPHL CL = 50pF 2 - - 175 - 220 - 265 ns 4.5 - - 35 - 44 - 53 ns CL =15pF 5 - 12 - - - - - ns CL = 50pF 6 - - 30 - 37 - 45 ns tPLH, tPHL CL = 50pF 2 - - 140 - 175 - 210 ns 4.5 - - 28 - 35 - 42 ns CL =15pF 5 - 11 - - - - - ns CL = 50pF 6 - - 24 - 30 - 36 ns tTLH, tTHL CL = 50pF 2 - - 75 - 95 - 110 ns 4.5 - - 15 - 19 - 22 ns 6 - - 13 - 16 - 19 ns SYMBOL HC TYPES Propagation Delay tPLH, tPHL CL = 50pF Select to Outputs Data to Outputs Enable to High Z and Enable from High Z Output Transition Time Input Capacitance CIN - - - - 10 - 10 - 10 pF Three-State Output Capacitance CO - - - - 15 - 15 - 15 pF Power Dissipation Capacitance (Notes 4, 5) CPD - 5 - 60 - - - - - pF CL = 50pF 4.5 - - 42 - 53 - 63 ns CL =15pF 5 - 18 - - - - ns 4.5 - - 35 - 44 - 53 ns 5 - 12 - - - - - ns 4.5 - 30 - 38 - 45 ns 5 - 12 - - - - - ns 4.5 - - 15 - 19 - 22 ns - - 10 - 10 - 10 pF 60 - - - - - pF HCT TYPES Propagation Delay tPLH, tPHL Select to Outputs Data to Outputs tPLH, tPHL CL = 50pF CL =15pF Enable to High Z and Enable tPLH, tPHL CL = 50pF from High Z CL =15pF Output Transition Time tTLH, tTHL CL = 50pF Input Capacitance CIN - - Power Dissipation Capacitance (Notes 4, 5) CPD - 5 NOTES: 4. CPD is used to determine the dynamic power consumption, per package. 5. PD = VCC2 fi (CPD + CL) where fi = input frequency, CL = output load capacitance, VCC = supply voltage. 5 CD74HC251, CD74HCT251 Test Circuits and Waveforms tr = 6ns tf = 6ns 90% 50% 10% INPUT GND tTLH tPHL 6ns 10% 2.7 1.3 OUTPUT LOW TO OFF 90% OUTPUT HIGH TO OFF 50% OUTPUTS DISABLED FIGURE 3. HC THREE-STATE PROPAGATION DELAY WAVEFORM OTHER INPUTS TIED HIGH OR LOW OUTPUT DISABLE IC WITH THREESTATE OUTPUT GND 1.3V tPZH 90% OUTPUTS ENABLED OUTPUTS ENABLED 0.3 10% tPHZ tPZH 3V tPZL tPLZ 50% OUTPUTS ENABLED 6ns GND 10% tPHZ tf OUTPUT DISABLE tPZL tPLZ OUTPUT HIGH TO OFF 6ns tr VCC 90% tPLH FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC 6ns OUTPUT LOW TO OFF 1.3V 10% INVERTING OUTPUT FIGURE 1. HC TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC 50% tTLH 90% tPLH tPHL GND tTHL 90% 50% 10% INVERTING OUTPUT 3V 2.7V 1.3V 0.3V INPUT tTHL OUTPUT DISABLE tf = 6ns tr = 6ns VCC 1.3V OUTPUTS DISABLED OUTPUTS ENABLED FIGURE 4. HCT THREE-STATE PROPAGATION DELAY WAVEFORM OUTPUT RL = 1kΩ CL 50pF VCC FOR tPLZ AND tPZL GND FOR tPHZ AND tPZH NOTE: Open drain waveforms tPLZ and tPZL are the same as those for three-state shown on the left. The test circuit is Output RL = 1kΩ to VCC, CL = 50pF. FIGURE 5. HC AND HCT THREE-STATE PROPAGATION DELAY TEST CIRCUIT 6 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. 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