SL74HCT245 Octal 3-State Noninverting Bus Transceiver High-Performance Silicon-Gate CMOS The SL74HCT245 is identical in pinout to the LS/ALS245.This device may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. The SL74HCT245 is a 3-state noninverting 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. * TTL/NMOS Compatible Input Levels * Outputs Directly Interface to CMOS, NMOS, and TTL * Operating Voltage Range: 4.5 to 5.5 V * Low Input Current: 1.0 A ORDERING INFORMATION SL74HCT245N Plastic SL74HCT245D SOIC TA = -55 to 125 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE PIN 20=VCC PIN 10 = GND Control Inputs Output Enable Direction Operation L L Data Transmitted from Bus B to Bus A L H Data Transmitted from Bus A to Bus B H X Buses Isolated (High Impedance State) X = don't care SLS System Logic Semiconductor SL74HCT245 MAXIMUM RATINGS * Symbol Parameter Value Unit -0.5 to +7.0 V VCC DC Supply Voltage (Referenced to GND) VIN DC Input Voltage (Referenced to GND) -1.5 to VCC +1.5 V DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V DC Input Current, per Pin 20 mA DC Output Current, per Pin 35 mA ICC DC Supply Current, VCC and GND Pins 75 mA PD Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ 750 500 mW -65 to +150 C 260 C VOUT IIN IOUT Tstg Storage Temperature TL Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) * 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 Parameter DC Supply Voltage (Referenced to GND) VIN, VOUT DC Input Voltage, Output Voltage (Referenced to GND) TA Operating Temperature, All Package Types tr, t f Input Rise and Fall Time (Figure 1) Min Max Unit 4.5 5.5 V 0 VCC V -55 +125 C 0 500 ns 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. SLS System Logic Semiconductor SL74HCT245 DC ELECTRICAL CHARACTERISTICS (Voltages Referenced to GND) VCC Guaranteed Limit Test Conditions V 25 C to -55C 85 C 125 C Unit Minimum High-Level Input Voltage VOUT=0.1 V or VCC-0.1 V IOUT 20 A 4.5 5.5 2.0 2.0 2.0 2.0 2.0 2.0 V VIL Maximum Low -Level Input Voltage VOUT=0.1 V or VCC-0.1 V IOUT 20 A 4.5 5.5 0.8 0.8 0.8 0.8 0.8 0.8 V VOH Minimum High-Level Output Voltage VIN=VIH or VIL IOUT 20 A 4.5 5.5 4.4 5.4 4.4 5.4 4.4 5.4 V VIN=VIH or VIL IOUT 6.0 mA 4.5 3.98 3.84 3.7 VIN= VIL or VIH IOUT 20 A 4.5 5.5 0.1 0.1 0.1 0.1 0.1 0.1 VIN= VIL or VIH IOUT 6.0 mA 4.5 0.26 0.33 0.4 Symbol Parameter VIH VOL Maximum Low-Level Output Voltage V IIN Maximum Input Leakage Current VIN=VCC or GND, Pin 1 or 19 5.5 0.1 1.0 1.0 A IOZ Maximum Three-State Leakage Current Output in High-Impedance State VIN= VIL or VIH VOUT=VCC or GND, I/O Pins 5.5 0.5 5.0 10 A ICC Maximum Quiescent Supply Current (per Package) VIN=VCC or GND IOUT=0A 5.5 4.0 40 160 A ICC Additional Quiescent Supply Current VIN=2.4 V, Any One Input VIN=VCC or GND, Other Inputs -55C 25C to 125C mA 2.9 2.4 IOUT=0A 5.5 SLS System Logic Semiconductor SL74HCT245 AC ELECTRICAL CHARACTERISTICS (VCC =5.0 V 10%, CL=50pF,Input t r=t f=6.0 ns) Guaranteed Limit Symbol Parameter 25 C to -55C 85C 125C Unit tPLH, t PHL Maximum Propagation Delay, A to B or B to A (Figures 1 and 3) 22 28 33 ns tPLZ, t PHZ Maximum Propagation Delay , Direction or Output Enable to A or B (Figures 2 and 4) 32 40 48 ns tPZL, t PZH Maximum Propagation Delay , Direction or Output Enable to A or B (Figures 2 and 4) 30 38 45 ns tTLH, t THL Maximum Output Transition Time, Any Output (Figures 1 and 3) 12 15 18 ns Maximum Input Capacitance (Pin 1 or Pin 19) 10 10 10 pF Maximum Three-State I/O Capacitance (I/O in High-Impedance State) 15 15 15 pF CIN COUT Power Dissipation Capacitance (Per Enable Output) CPD Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC Figure 1. Switching Waveforms SLS System Logic Semiconductor Typical @25C,VCC=5.0 V 97 pF Figure 2. Switching Waveforms SL74HCT245 Figure 3. Test Circuit Figure 4. Test Circuit EXPANDED LOGIC DIAGRAM SLS System Logic Semiconductor