74VHC245 # 74VHCT245 Octal Bidirectional Transceiver with TRI-STATEE Outputs General Description Features The VHC/VHCT245 is an advanced high speed CMOS octal bus transceiver fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The 'VHC245 is intended for bidirectional asynchronous communication between data busses. The direction of data transmission is determined by the level of the T/R input. The enable input can be used to disable the device so that the busses are effectively isolated. All inputs are equipped with protection circuits against static discharge. Y Y Y Y Y Y High Noise Immunity: VHC VNIH e VNIL e 28% VCC (Min) VHCT VIH e 2.0V, VIL e 0.8V Power Down Protection: VHC Inputs Only VHCT Inputs and Outputs Low Noise: VHC VOLP e 0.9V (typ) VHCT VOLP e 1.1V (typ) Low Power Dissipation: ICC e 4 mA (Max) @ Ta e 25 C Balanced Propagation Delays: tpLH j tpHL Pin and Function Compatible with 74HC/HCT245 Package Number Commercial 74VHC245M Package Description M20B 20 Lead Molded JEDEC SOIC 74VHC245SJ M20D 20 Lead Molded EIAJ SOIC 74VHC245MSC MSC20 20 Lead Molded EIAJ Type 1 SSOP 74VHC245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP 74VHC245N N20A 20 Lead Molded DIP 74VHCT245M M20B 20 Lead Molded JEDEC SOIC 74VHCT245SJ M20D 20 Lead Molded EIAJ SOIC 74VHCT245MTC MTC20 20 Lead Molded JEDEC Type 1 TSSOP 74VHCT245N N20A 20 Lead Molded DIP Note: Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ``X'' to the ordering code. EIAJ Type 1 SSOP available on Tape and Reel only, order MSCX. Logic Symbol Connection Diagram Pin Assignment for DIP, SSOP, TSSOP and SOIC IEEE/IEC Pin Description Pin Names Description OE T/R A0 -A7 Output Enable Input Transmit/Receive Input Side A Inputs or B0 -B7 TRI-STATE Outputs Side B Inputs or TRI-STATE Outputs Truth Table Inputs TL/F/11520 - 3 TL/F/11520-2 Outputs OE T/R L L H L H X Bus B Data to Bus A Bus A Data to Bus B HIGH-Z State H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial TRI-STATEE is a registered trademark of National Semiconductor Corporation. C1995 National Semiconductor Corporation TL/F/11520 RRD-B30M125/Printed in U. S. A. 74VHC245 # 74VHCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs October 1995 Note 1: Absolute Maximum Ratings are values beyond which the device may be damaged or have its useful life impaired. The databook specifications should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading variables. National does not recommend operation outside databook specifications. Absolute Maximum Ratings (Note 1) Supply Voltage (VCC) DC Input Voltage (VIN) (T/R, OE) DC Output Voltage (VOUT) VHC VHCT* b 0.5V to a 7.0V b 0.5V to 7.0V b 0.5V to VCC a 0.5V b 0.5V to 7.0V Input Diode Current (IIK) (T/R, OE) Output Diode Current (IOK) (VHC) (VHCT) b 20 mA DC Output Current (IOUT) DC VCC/GND Current (ICC) Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) g 25 mA Recommended Operating Conditions g 20 mA b 20 mA Supply Voltage (VCC) VHC VHCT* Input Voltage (VIN)(T/R, OE) g 75 mA b 65 C to a 150 C Output Voltage (VOUT) Operating Temperature (TOPR) 74 VHC/VHCT 260 C *VOUT l VCC only if output is in H or Z state. Input Rise and Fall Time (tr, tf) VCC e 3.3V g 0.3V (VHC only) VCC e 5.0V g 0.5V 2.0V to 5.5V 4.5V to 5.5V 0V to 5.5V 0V to VCC b 40 C to a 85 C 0 E 100 ns/V 0 E 20 ns/V DC Characteristics for 'VHC Family Devices Symbol Parameter VCC (V) 74VHC 74VHC TA e 25 C TA e b40 C to a 85 C Min VIH High Level Input Voltage 2.0 3.0-5.5 VIL Low Level Input Voltage 2.0 3.0-5.5 VOH High Level Output Voltage VOL IOZ Low Level Output Voltage TRI-STATE Output OffState Current IIN (T/R, OE) Input Leakage Current ICC Quiescent Supply Current Max Min 1.9 2.9 4.4 4.5 4.5 2.58 3.94 2.0 3.0 4.5 0.0 0.0 0.0 Conditions Max 1.50 0.7 VCC 0.50 0.3 VCC 2.0 3.0 4.5 2.0 3.0 4.5 Typ 1.50 0.7 VCC Units V 0.50 0.3 VCC V 1.9 2.9 4.4 V 2.48 3.80 V VIN e VIH IOH e b50 mA or VIL IOH e b4 mA IOH e b8 mA 0.1 0.1 0.1 0.1 0.1 0.1 V 3.0 4.5 0.36 0.36 0.44 0.44 V 5.5 g 0.25 g 2.5 mA 0-5.5 g 0.1 g 1.0 mA VIN e 5.5V or GND 5.5 4.0 40.0 mA VIN e VCC or GND 2 VIN e VIH IOL e 50 mA or VIL IOL e 4 mA IOL e 8 mA VIN e VCC or GND VOUT e VCC or GND VIN OE e VIH or VIL DC Characteristics for 'VHC Family Devices: 74VHC Symbol VCC (V) Parameter TA e 25 C Typ Limits Units Conditions *VOLP Quiet Output Maximum Dynamic VOL 5.0 0.9 1.2 V CL e 50 pF *VOLV Quiet Output Minimum Dynamic VOL 5.0 b 0.9 b 1.2 V CL e 50 pF *VIHD Minimum High Level Dynamic Input Voltage 5.0 3.5 V CL e 50 pF *VILD Maximum Low Level Dynamic Input Voltage 5.0 1.5 V CL e 50 pF *Parameter guaranteed by design. DC Characteristics for 'VHCT Family Devices Symbol Parameter VCC (V) Min VIH High Level Input Voltage 4.5 5.5 VIL Low Level Input Voltage 4.5 5.5 VOH High Level Output Voltage 4.5 3.15 4.5 2.5 VOL Low Level Output Voltage IOZ TRI-STATE Output Off-State Current IIN (T/R, OE) Input Leakage Current ICC Quiescent Supply Current ICCT Maximum ICC/Input IOPD Output Leakage Current (Power Down State) 4.5 4.5 74VHCT 74VHCT TA e 25 C TA e b40 C to a 85 C Typ Max 2.0 2.0 Min 3.65 V 0.8 0.8 3.15 V V 2.4 0.0 Conditions Max 2.0 2.0 0.8 0.8 Units V 0.1 0.1 V 0.36 0.44 V VIN e VIH or VIL IOH e b50 mA VIN e VIH or VIL IOL e 50 mA IOH e b8 mA IOL e 8 mA VIN e VCC or GND VOUT e VCC or GND VIN OE e VIH or VIL 5.5 g 0.25 g 2.5 mA 0-5.5 g 0.1 g 1.0 mA VIN e 5.5V or GND 5.5 4.0 40.0 mA VIN e VCC or GND 5.5 1.35 1.50 mA VIN e 3.4V Other Inputs e VCC or GND 0.0 a 0.5 a 5.0 mA VOUT e 5.5V 3 DC Characteristics for 'VHCT Family Devices: 74VHCT Symbol VCC (V) Parameter TA e 25 C Typ Limits Units Conditions VOLP* Quiet Output Maximum Dynamic VOL 1.1 1.6 V CL e 50 pF VOLV* Quiet Output Minimum Dynamic VOL b 1.1 b 1.6 V CL e 50 pF VIHD* Minimum High Level Dynamic Input Voltage V CL e 50 pF VILD* Maximum Low Level Dynamic Input Voltage V CL e 50 pF 2.0 0.8 *Parameter guaranteed by design. AC Electrical Characteristics for 'VHC Family Devices Symbol Parameter VCC (V) 74VHC 74VHC TA e 25 C TA e b40 C to a 85 C Min tPLH tPHL Propagation Delay Time 3.3 g 0.3 5.0 g 0.5 tPZL tPZH TRI-STATE Output Enable Time 3.3 g 0.3 5.0 g 0.5 Typ Max Min Max 5.8 8.4 1.0 10.0 8.3 11.9 1.0 13.5 4.0 5.5 1.0 6.5 5.5 7.5 1.0 8.5 8.5 13.2 1.0 15.5 11.0 16.7 1.0 19.0 5.8 8.5 1.0 10.0 7.3 10.6 1.0 12.0 tPLZ tPHZ TRI-STATE Output Disable Time 3.3 g 0.3 11.5 15.8 1.0 18.0 5.0 g 0.5 7.0 9.7 1.0 11.0 tOSLH tOSHL Output to Output Skew 3.3 g 0.3 1.5 1.5 5.0 g 0.5 1.0 1.0 CIN (T/R, OE) Input Capacitance CI/O Output Capacitance CPD Power Dissipation Capacitance Units Conditions CL e 15 pF ns CL e 50 pF CL e 15 pF ns CL e 50 pF ns RL e 1 kX CL e 50 pF CL e 15 pF ns CL e 50 pF ns RL e 1 kX ns (Note 1) 8 pF VCC e 5.0V 21 pF 10 CL e 50 pF CL e 50 pF pF 10 CL e 50 pF CL e 50 pF VCC e Open 4 CL e 15 pF (Note 2) Note 1: Parameter guaranteed by design. tOSLH e l tPLH max b tPLH min l ; tOSHL e l tPHL max b tPHL min l Note 2: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) e CPD * VCC * fIN a ICC/8 (per Bit). 4 AC Electrical Characteristics for 'VHCT Family Devices Symbol Parameter VCC (V) 74VHCT 74VHCT TA e 25 C TA e b40 C to a 85 C Min Typ Max Min Max 7.7 1.0 8.5 Units Conditions tPLH tPHL Propagation Delay Time 5.0 g 0.5 4.5 CL e 15 pF 5.3 8.7 1.0 9.5 tPZL tPZH TRI-STATE Output Enable Time 5.0 g 0.5 8.9 13.8 1.0 15.0 9.7 14.8 1.0 16.0 tPLZ tPHZ TRI-STATE Output Disable Time 5.0 g 0.5 10.0 15.4 1.0 16.5 ns tOSLH tOSHL Output to Output Skew 5.0 g 0.5 1.0 1.0 ns CIN Input Capacitance 4 10 10 pF VCC e Open CI/O Output Capacitance 9 pF VCC e 5.0V CPD Power Dissipation Capacitance 23 pF ns CL e 50 pF ns RL e 1 kX CL e 15 pF CL e 50 pF RL e 1 kX CL e 50 pF (Note 1) CL e 50 pF (Note 2) Note 1: Parameter guaranteed by design. tOSLH e l tPLH max b tPLH min l ; tOSHL e l tPHL max b tPHL min l Note 2: CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) e CPD * VCC * fIN a ICC/8 (per Bit). 5 Ordering Information The device number is used to form part of a simplified purchasing code, where the package type and temperature range are defined as follows: TL/F/11520 - 5 6 Physical Dimensions inches (millimeters) 20-Lead Small Outline Integrated CircuitJEDEC SOIC (M) Order Number 74VHC245M, 74VHC245MX, 74VHCT245M, or 74VHCT245MX NS Package Number M20B 20-Lead Small Outline Package EIAJ SOIC (SJ) Order Number 74VHC245SJ, 74VHC245SJX, 74VHCT245SJ, or 74VHCT245SJX NS Package Number M20D 7 Physical Dimensions millimeters (Continued) 20-Lead Plastic EIAJ SSOP Type I (MSC) Order Number 74VHC245MSCX NS Package Number MSC20 8 Physical Dimensions millimeters (Continued) 20-Lead Plastic JEDEC TSSOP Type I (MTC) Order Number 74VHC245MTC, 74VHC245MTCX, 74VHCT245MTC or 74VHCT245MTCX NS Package Number MTC20 9 74VHC245 # 74VHCT245 Octal Bidirectional Transceiver with TRI-STATE Outputs Physical Dimensions inches (millimeters) (Continued) 20-Lead (0.300x Wide) Molded Dual-In-Line Package Order Number 74VHCT245N NS Package Number N20A LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION. 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