Revised March 1999 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 = 5V ■ High Noise Immunity: VNIH = VNIL = 28% VCC (Min) ■ Power Down Protection is provided on all inputs ■ Low Noise: VOLP = 0.9V (typ) ■ Low Power Dissipation: ICC = 4 µA (Max) @ TA = 25°C ■ Pin and Function Compatible with 74HC245 Ordering Code: Order Number Package Number 74VHC245M M20B 74VHC245SJ M20D 74VHC245MTC MTC20 74VHC245N N20A Package Description 20-Lead Small Outline Integrated Package (SOIC), JEDEC MS-013, 0.300” Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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. Connection Diagram Logic Symbol 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 © 1999 Fairchild Semiconductor Corporation DS011520.prf Outputs T/R L L L H Bus B Data to Bus A 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 Supply Voltage (VCC) −0.5V to 7.0V DC Input Voltage (VIN) (T/R, OE) Supply Voltage (VCC) −0.5V to VCC + 0.5V DC Output Voltage (VOUT) 2.0V to 5.5V Input Voltage (VIN)(T/R, OE) 0V to 5.5V Input Diode Current (IIK) (T/R, OE) −20 mA Output Voltage (VOUT) Output Diode Current (IOK) ±20 mA Operating Temperature (TOPR) DC Output Current (IOUT ) ±25 mA Input Rise and Fall Time (tr, tf) DC VCC/GND Current (ICC) ±75 mA VCC = 3.3V ± 0.3V 0 ∼ 100 ns/V −65°C to +150°C VCC = 5.0V ± 0.5V 0 ∼ 20 ns/V Storage Temperature (TSTG) 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. Lead Temperature (TL) (Soldering, 10 seconds) 0V to VCC −40°C to +85°C 260°C 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 VCC (V) TA = 25°C Min Typ TA = −40°C to +85°C Max Min 2.0 1.50 1.50 3.0 − 5.5 0.7 VCC 0.7 VCC 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 4.4 3.0 2.58 2.48 4.5 3.94 3.80 V VIN = VIH IOH = −50 µA V or VIL IOH = −4 mA V LOW Level 2.0 0.0 0.1 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 IOH = −8 mA VIN = VIH IOL = 50 µA V V or VIL IOL = 4 mA IOL = 8 mA VIN = VCC or GND 3-STATE Output Off-State Current Conditions V 3.0 − 5.5 Output Voltage Units Max 5.5 ±0.25 ±2.5 µA VOUT = VCC or GND 0 − 5.5 ±0.1 ±1.0 µA VIN = 5.5V or GND 5.5 4.0 40.0 µA VIN = VCC or GND VIN OE = VIH or VIL IIN Input Leakage (T/R, OE) Current ICC Quiescent Supply Current www.fairchildsemi.com 2 74VHC245 Noise Characteristics Symbol VOLP Parameter Quiet Output Maximum (Note 3) Dynamic VOL VOLV Quiet Output Minimum (Note 3) Dynamic VOL VIHD Minimum HIGH Level (Note 3) Dynamic Input Voltage VILD Maximum LOW Level (Note 3) Dynamic Input Voltage TA = 25°C VCC (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 Units Conditions Note 3: Parameter guaranteed by design. AC Electrical Characteristics Symbol Parameter tPLH Propagation Delay tPHL Time tPZL 3-STATE Output tPZH Enable Time VCC (V) 3.3 ± 0.3 TA = 25°C Min Typ TA = −40°C to +85°C Max Min Max 5.8 8.4 1.0 10.0 8.3 11.9 1.0 13.5 5.0 ± 0.5 4.0 5.5 1.0 6.5 5.5 7.5 1.0 8.5 3.3 ± 0.3 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 5.0 ± 0.5 tPLZ 3-STATE Output 3.3 ± 0.3 11.5 15.8 1.0 18.0 tPHZ Disable Time 5.0 ± 0.5 7.0 9.7 1.0 11.0 tOSLH Output to Output 3.3 ± 0.3 1.5 1.5 tOSHL Skew 5.0 ± 0.5 1.0 1.0 CIN Input Capacitance 10 10 4 Units Conditions CL = 15 pF ns CL = 50 pF CL = 15 pF ns ns CL = 50 pF RL = 1 kΩ CL = 15 pF CL = 50 pF CL = 15 pF ns ns ns pF CL = 50 pF RL = 1 kΩ CL = 50 pF CL = 50 pF (Note 4) CL = 50 pF CL = 50 pF VCC = Open (T/R, OE) CI/O Output Capacitance 8 pF VCC = 5.0V 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 + ICC/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 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D www.fairchildsemi.com 4 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 5 www.fairchildsemi.com 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 LIFE SUPPORT POLICY FAIRCHILD’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 FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user. 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.