Revised April 2005 74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs General Description Features The VHC245 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. ■ High Speed: tPD 4.0 ns (typ) at VCC ■ High Noise Immunity: VNIH VNIL 5V 28% VCC (Min) ■ Power Down Protection is provided on all inputs ■ Low Noise: VOLP 0.9V (typ) ■ Low Power Dissipation: ICC 4 PA (Max) @ TA 25qC ■ Pin and Function Compatible with 74HC245 Ordering Code: Order Number Package Number 74VHC245M 74VHC245SJ 74VHC245MTC 74VHC245N Package Description M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide M20D Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MTC20 N20A 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Pb-Free package per JEDEC J-STD-020B. Logic Symbol Connection Diagram IEEE/IEC Truth Table Pin Description Pin Inputs Description OE Names OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A Inputs or 3-STATE Outputs B0–B7 Side B Inputs or 3-STATE Outputs © 2005 Fairchild Semiconductor Corporation DS011520 Outputs T/R L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State H HIGH Voltage Level L LOW Voltage Level X Immaterial Any unused bus terminals during HIGH-Z State must be held HIGH or LOW. www.fairchildsemi.com 74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs November 1992 74VHC245 Absolute Maximum Ratings(Note 1) Recommended Operating Conditions (Note 2) 0.5V to 7.0V 0.5V to 7.0V 0.5V to VCC 0.5V 20 mA r20 mA r25 mA r75 mA 65qC to 150qC Supply Voltage (VCC) DC Input Voltage (VIN) (T/R, OE) DC Output Voltage (VOUT) Input Diode Current (IIK) (T/R, OE) Output Diode Current (IOK) DC Output Current (IOUT ) DC VCC/GND Current (ICC) Storage Temperature (TSTG) Supply Voltage (VCC) 0V to 5.5V Output Voltage (VOUT) 0V to VCC 40qC to 85qC Operating Temperature (TOPR) Input Rise and Fall Time (tr, tf) Lead Temperature (TL) VCC 3.3V r 0.3V 0 a 100 ns/V VCC 5.0V r 0.5V 0 a 20 ns/V 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. Fairchild does not recommend operation outside databook specifications. 260qC (Soldering, 10 seconds) 2.0V to 5.5V Input Voltage (VIN)(T/R, OE) Note 2: Unused inputs or I/O pins must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH Parameter HIGH Level Input Voltage VIL LOW Level Input Voltage VOH VOL IOZ TA VCC (V) Min 25qC Typ TA Max 40qC to 85qC Min 2.0 1.50 1.50 3.0 5.5 0.7 VCC 0.7 VCC Max 2.0 0.50 0.50 0.3 VCC 0.3 VCC HIGH Level 2.0 1.9 2.0 1.9 3.0 2.9 3.0 2.9 4.5 4.4 4.5 3.0 2.58 2.48 4.5 3.94 3.80 V VIN V VIH IOH IOH V 2.0 0.0 0.1 Output Voltage 3.0 0.0 0.1 0.1 4.5 0.0 0.1 0.1 3.0 0.36 0.44 4.5 0.36 0.44 0.1 IOH VIN V VIH IOL VIN r0.25 5.5 r2.5 PA (T/R, OE) Current ICC Quiescent Supply Current www.fairchildsemi.com 8 mA 50 PA IOL 4 mA IOL 8 mA VCC or GND VCC or GND VOUT VIN OE Input Leakage 4 mA or VIL V 3-STATE Output IIN 50 PA or VIL 4.4 LOW Level Off-State Current Conditions V 3.0 5.5 Output Voltage Units VIH or VIL 0 5.5 r0.1 r1.0 PA VIN 5.5V or GND 5.5 4.0 40.0 PA VIN VCC or GND 2 74VHC245 Noise Characteristics Symbol VOLP Quiet Output Maximum (Note 3) Dynamic VOL VOLV Quiet Output Minimum (Note 3) VIHD (Note 3) VILD (Note 3) VCC Parameter TA 25qC Units Conditions (V) Typ Limits 5.0 0.9 1.2 V CL 50 pF 5.0 0.9 1.2 V CL 50 pF 5.0 3.5 V CL 50 pF 5.0 1.5 V CL 50 pF Dynamic VOL Minimum HIGH Level Dynamic Input Voltage Maximum LOW Level Dynamic Input Voltage Note 3: Parameter guaranteed by design. AC Electrical Characteristics Symbol VCC Parameter tPLH Propagation Delay tPHL Time (V) 3.3 r 0.3 5.0 r 0.5 tPZL 3-STATE Output tPZH Enable Time 3.3 r 0.3 5.0 r 0.5 25qC TA Min Typ TA Max 40qC to 85qC 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 3-STATE Output 3.3 r 0.3 11.5 15.8 1.0 18.0 tPHZ Disable Time 5.0 r 0.5 7.0 9.7 1.0 11.0 tOSLH Output to Output 3.3 r 0.3 1.5 1.5 tOSHL Skew 5.0 r 0.5 1.0 1.0 CIN Input Capacitance 10 10 4 Units Conditions ns ns ns RL 1 k: ns 1 k: CL 15 pF CL 50 pF CL 15 pF CL 50 pF CL 15 pF CL 50 pF CL 15 pF CL 50 pF CL 50 pF CL 50 pF CL 50 pF CL 50 pF ns RL ns (Note 4) pF VCC Open 5.0V (T/R, OE) CI/O Output Capacitance 8 pF VCC CPD Power Dissipation 21 pF (Note 5) Capacitance Note 4: Parameter guaranteed by design. tOSLH |tPLH max tPLH min|; t OSHL |tPHL max tPHL min| Note 5: 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.) CPD * VCC * fIN I CC/8 (per Bit). 3 www.fairchildsemi.com 74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B www.fairchildsemi.com 4 74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.com 74VHC245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20 www.fairchildsemi.com 6 74VHC245 Octal Bidirectional Transceiver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N20A Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 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