Revised April 1999 74VHCT540A Octal Buffer/Line Driver with 3-STATE Outputs General Description The VHCT540A is an advanced high-speed CMOS device fabricated with silicon gate CMOS technology. It achieves the high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. The VHCT540A is an octal buffer/line driver designed to be employed as memory and address drivers, clock drivers and bus oriented transmitter/receivers. This device is similar in function to the VHCT240A while providing flow-through architecture (inputs on opposite side from outputs). This pinout arrangement makes this device especially useful as an output port for microprocessors, allowing ease of layout and greater PC board density. Protection circuits ensure that 0V to 7V can be applied to the input and output (Note 1) pins without regard to the supply voltage. This device can be used to interface 3V to 5V systems and two supply systems such as battery backup. This circuit prevents device destruction due to mismatched supply and input voltages. Note 1: Outputs in OFF-STATE Features ■ High Speed: tPD = 5.4 ns (typ) at VCC = 5V ■ Low Power Dissipation: ICC = 4 µA (max) at TA = 25°C ■ Power down protection is provided on all inputs and outputs ■ Pin and function compatible with 74HCT540 Ordering Code: Order Number Package Number 74VHCT540AM 74VHCT540ASJ 74VHCT540AMTC 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MTC20 74VHCT540AN Package Dissipation M20B 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. Connection Diagram Logic Symbol IEEE/IEC Pin Descriptions Pin Names Truth Table Description Inputs OE1, OE2 3-STATE Output Enable Inputs I0 - I7 Inputs O0 - O7 3-STATE Outputs I L L H L H X X Z X H X Z L L L H H = HIGH Voltage Level L = LOW Voltage Level © 1999 Fairchild Semiconductor Corporation DS500012.prf Outputs OE2 OE1 X = Immaterial Z = High Impedance www.fairchildsemi.com 74VHCT540A Octal Buffer/Line Driver with 3-STATE Outputs June 1997 74VHCT540A Absolute Maximum Ratings(Note 2) Supply Voltage (VCC ) −0.5V to +7.0V DC Input Voltage (VIN) −0.5V to +7.0V Recommended Operating Conditions (Note 6) 4.5V to +5.5V Supply Voltage (VCC) DC Output Voltage (VOUT) 0V to +5.5V Input Voltage (VIN) (Note 3) −0.5V to +7.0V (Note 4) −0.5V to VCC + 0.5V (Note 4) 0V to VCC −20 mA (Note 3) 0V to 5.5V Input Diode Current (IIK) Output Voltage (VOUT) Output Diode Current (IOK) −40°C to +85°C Operating Temperature (TOPR) ±20 mA (Note 5) DC Output Current (IOUT) ±25 mA DC VCC/GND Current (ICC) ±75 mA Input Rise and Fall Time (tr, tf) VCC = 5.0V ± 0.5V −65°C to +150°C Storage Temperature (TSTG) Lead Temperature (TL) (Soldering, 10 seconds) 0 ≈ 20 ns/V Note 2: 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. 260°C Note 3: When outputs are in OFF-STATE or when VCC = OV. Note 4: HIGH or LOW state. IOUT absolute maximum rating must be observed. Note 5: VOUT <GND, VOUT > VCC (outputs active). Note 6: Unused inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VCC (V) Parameter TA = 25°C Min TA = −40°C to +85°C Typ Max Min Max Units Conditions VIH HIGH Level Input Voltage 4.5 − 5.5 VIL LOW Level Input Voltage VOH HIGH Level 4.5 4.4 Output Voltage 4.5 3.94 LOW Level 4.5 0.1 0.1 V Output Voltage 4.5 0.36 0.44 V IOZ 3-STATE Output OFF-STATE Current 5.5 ±0.25 ±2.5 µA VIN = VIH or VIL VOUT = VCC or GND IIN Input Leakage Current 0 − 5.5 ±0.1 ±1.0 µA VIN = 5.5V or GND ICC Quiescent Supply Current 5.5 4.0 40.0 µA VIN = VCC or GND ICCT Maximum ICC/input 5.5 1.35 1.50 mA VIN = 3.4V other inputs = VCC or GND IOFF Output Leakage Current 0 0.5 5.0 µA VOUT = 5.5V VOL 2.0 2.0 4.5 − 5.5 V 0.8 0.8 4.5 0.0 V 4.4 V 3.80 V VIN = VIH IOH = −50 µA or VIL IOH = −8 mA VIN = VIH IOL = 50 µA or VIL IOL = 8 mA Noise Characteristics Symbol Parameter VOLP Quiet Output Maximum (Note 7) Dynamic VOL VOLV Quiet Output Minimum (Note 7) Dynamic VOL VIHD Minimum HIGH Level Dynamic (Note 7) Input Voltage VILD Maximum HIGH Level Dynamic (Note 7) Input Voltage TA = 25°C VCC (V) Typ Limits 5.0 1.2 1.6 V CL = 50 pF 5.0 −1.2 1.6 V CL = 50 pF 5.0 2.0 V CL = 50 pF 5.0 0.8 V CL = 50 pF Note 7: Parameter guaranteed by design. www.fairchildsemi.com 2 Units Conditions Symbol Parameter tPLH Propagation Delay tPHL Time tPZL 3-STATE Output tPZH Enable Time tPLZ 3-STATE Output tPHZ Disable Time tOSLH Output to Output tOSHL Skew CIN Input Capacitance COUT Output Capacitance CPD Power Dissipation Capacitance VCC (V) 5.0 ± 0.5 5.0 ± 0.5 5.0 ± 0.5 TA = 25°C Min TA = −40°C to +85°C Typ Max Min Max 5.4 7.4 1.0 8.5 5.9 8.4 1.0 9.5 8.3 11.3 1.0 13.0 8.8 12.3 1.0 14.0 9.4 11.9 1.0 13.5 5.0 ± 0.5 Units Conditions CL = 15 pF ns CL = 50 pF CL = 15 pF ns RL = 1 kΩ ns RL = 1 kΩ CL = 50 pF CL = 50 pF CL = 50 pF 1.0 1.0 ns (Note 8) 10 10 pF VCC = Open 9 pF VCC = 5.0V 19 pF (Note 9) 4 Note 8: Parameter guaranteed by design. tOSLH = |tPLHmax − t PLHmin|; tOSLH = |tPHLmax − tPHLmin|. Note 9: 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 74VHCT540A AC Electrical Characteristics 74VHCT540A 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 74VHCT540A 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 74VHCT540A Octal Buffer/Line Driver 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.