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| TECHNICAL DATA IN74AC643 Octal 3-State Bus Transceiver High-Speed Silicon-Gate CMOS The IN74AC643 is identical in pinout to the LS/ALS643, HC/HCT643. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. The IN74AC643 is a 3-state transceiver that is used for 2-way asynchronous communication between data buses. The device has an active-low Output Enable pin, which is used to place the I/O ports into high-impedance states. The Direction control determines whether data flows from A to B or from B to A. * Outputs Directly Interface to CMOS, NMOS, and TTL * Operating Voltage Range: 2.0 to 6.0 V * Low Input Current: 1.0 A; o.1 A @ 25C * High Noise Immunity Characteristic of CMOS Devices * Outputs Source/Sink 24 mA ORDERING INFORMATION IN74AC643N Plastic IN74AC643DW SOIC TA = -40 to 85 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Control Inputs Output Enable L PIN 20=VCC PIN 10 = GND Direction L Operation Data Transmitted from Bus B to Bus A Data Transmitted from Bus A to Bus B (inverted) Buses Isolated (High Impedance State) L H H X X = don't care 506 IN74AC643 MAXIMUM RATINGS* Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) Value -0.5 to +7.0 -0.5 to VCC +0.5 -0.5 to VCC +0.5 20 50 50 750 500 -65 to +150 260 Unit V V V mA mA mA mW C C Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. +Derating - Plastic DIP: - 10 mW/C from 65 to 125C SOIC Package: : - 7 mW/C from 65 to 125C RECOMMENDED OPERATING CONDITIONS Symbol VCC VIN, VOUT TJ TA IOH IOL tr, tf Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) Junction Temperature (PDIP) Operating Temperature, All Package Types Output Current - High Output Current - Low Input Rise and Fall Time (except Schmitt Inputs) * Min 2.0 0 -40 Max 6.0 VCC 140 +85 -24 24 Unit V V C C mA mA ns/V VCC =3.0 V VCC =4.5 V VCC =5.5 V 0 0 0 150 40 25 * VIN from 30% to 70% VCC This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND(VIN or VOUT)VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open. 507 IN74AC643 DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) VCC Symbol VIH Parameter Minimum High-Level Input Voltage Maximum Low Level Input Voltage Minimum High-Level Output Voltage Test Conditions VOUT=0.1 V or VCC-0.1 V V 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 3.0 4.5 5.5 5.5 5.5 Guaranteed Limits 25 C 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.56 3.86 4.86 0.1 0.1 0.1 0.36 0.36 0.36 0.1 0.6 -40C to 85C 2.1 3.15 3.85 0.9 1.35 1.65 2.9 4.4 5.4 2.46 3.76 4.76 0.1 0.1 0.1 0.44 0.44 0.44 1.0 6.0 A A V Unit V VIL VOUT=0.1 V or VCC-0.1 V V VOH IOUT -50 A V * VIN=VIH or VIL IOH=-12 mA IOH=-24 mA IOH=-24 mA VOL Maximum Low-Level Output Voltage IOUT 50 A VIN=VIH or VIL IOL=12 mA IOL=24 mA IOL=24 mA IIN IOZ Maximum Input Leakage Current Maximum ThreeState Leakage Current +Minimum Dynamic Output Current +Minimum Dynamic Output Current Maximum Quiescent Supply Current (per Package) VIN=VCC or GND VIN(OE)= VIH or VIL VIN=VCC or GND VOUT=VCC or GND VOLD=1.65 V Max VOHD=3.85 V Min VIN=VCC or GND * IOLD IOHD ICC 5.5 5.5 5.5 8.0 75 -75 80 mA mA A All outputs loaded; thresholds on input associated with output under test. +Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC * 508 IN74AC643 AC ELECTRICAL CHARACTERISTICS(CL=50pF,Input tr=tf=3.0 ns) VCC* Symbol Parameter V Guaranteed Limits 25 C Min tPLH tPHL tPZH tPZL tPHZ tPLZ CIN COUT Propagation Delay, A to B or B to A (Figure 1) Propagation Delay, A to B or B to A (Figure 1) Propagation Delay, Direction or Output Enable to A or B (Figure 2) Propagation Delay, Direction or Output Enable to A or B (Figure 2) Propagation Delay, Direction or Output Enable to A or B (Figure 2) Propagation Delay, Direction or Output Enable to A or B (Figure 2) Maximum Input Capacitance Maximum Tree-State I/O Capacitance (Output in High-Impedance State0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 3.3 5.0 5.0 5.0 1.5 1.5 1.5 1.5 2.5 1.5 2.5 1.5 2.0 1.5 2.0 1.5 4.5 15 Max 8.5 6.5 8.5 6.5 12.5 9.5 12.5 9.5 12.0 9.0 12.0 9.5 -40C to 85C Min 1.0 1.0 1.0 1.0 2.0 1.0 2.0 1.0 1.0 1.0 1.5 1.0 4.5 15 Max 9.5 7.5 9.5 7.5 13.5 10.0 13.5 10.0 12.5 10.0 13.5 10.5 ns ns ns ns ns ns pF pF Unit Typical @25C,VCC=5.0 V CPD * Power Dissipation Capacitance 45 pF Voltage Range 3.3 V is 3.3 V 0.3 V Voltage Range 5.0 V is 5.0 V 0.5 V Figure 1. Switching Waveforms Figure 2. Switching Waveforms 509 IN74AC643 EXPANDED LOGIC DIAGRAM 510 |
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