Revised March 1999 74VHCT244A Octal Buffer/Line Driver with 3-STATE Outputs General Description The VHCT244A 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 VHCT244A is a non-inverting 3STATE buffer having two active-LOW output enables. This device is designed to be used as 3-STATE memory address drivers, clock drivers, and bus oriented transmitter/ receivers. Protection circuits ensure that 0V to 7V can be applied to the input and output (Note 1) pins without regard to the supply voltage. These circuits prevent device destruction due to mismatched supply and input/output voltages. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. Note 1: Outputs in OFF-State Features ■ High Speed: tPD = 5.9 ns (typ) at VCC = 5V ■ Power down protection is provided on inputs and outputs ■ Low power dissipation: ICC = 4 µA (max) @ TA = 25°C ■ Pin and function compatible with 74HCT244 Ordering Code: Order Number Package Number 74VHCT244AM 74VHCT244ASJ 74VHCT244AMTC 74VHCT244AN Package Description M20B 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 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide N20A 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. Logic Symbol Connection Diagram Pin Descriptions Pin Names Description OE1, OE2 3-STATE Output Enable Inputs I0–I7 Inputs O0–O7 3-STATE Outputs © 1999 Fairchild Semiconductor Corporation DS500003.prf www.fairchildsemi.com 74VHCT244A Octal Buffer/Line Driver with 3-STATE Outputs March 1997 74VHCT244A Truth Tables Inputs Outputs (Pins 12, 14, 16, 18) In OE1 L L L L H H H X Z OE2 In Outputs (Pins 3, 5, 7, 9) L L L L H H H X Z Inputs H = HIGH Voltage Level L = LOW Voltage Level I = Immaterial Z = High Impedance www.fairchildsemi.com 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 VCC + 0.5V (Note 4) −0.5V to +7.0V (Note 3) 0V to VCC −20 mA (Note 4) 0V to +5.5V Input Diode Current (IIK) Output Voltage (VOUT) Output Diode Current (IOK) (Note 5) ±20 mA Operating Temperature (TOPR) DC Output Current (IOUT ) ±25 mA Input Rise and Fall Time (tr, tf) ±75 mA DC VCC/GND Current (ICC) VCC = 5.0V ± 0.5V −65°C to +150°C Storage Temperature (TSTG) 0 ns/V ∼ 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. Lead Temperature (TL) (Soldering, 10 seconds) −40°C to +85°C 260°C Note 3: HIGH or LOW state. IOUT absolute maximum rating must be observed. Note 4: When outputs are in OFF-STATE or when VCC = OV. Note 5: VOUT < GND, V OUT > VCC (Outputs Active). Note 6: Unused inputs must be held HIGH or LOW. They may not float. DC Electrical Characteristics Symbol VIH VIL VOH HIGH Level 4.5 2.0 2.0 Input Voltage 5.5 2.0 2.0 Min Max 4.5 0.8 0.8 0.8 0.8 HIGH Level LOW Level 3-STATE Output Input Leakage Quiescent Supply Current ICCT Maximum ICC/Input IOFF Output Leakage Current (Power Down State) 4.5 4.5 4.40 4.50 3.94 0.0 Units V 4.40 V 3.80 V 0.1 0.1 V 0.36 0.44 V 5.5 ±0.25 ±2.5 µA 0–5.5 ±0.1 ±1.0 µA 5.5 4.0 40.0 µA 5.5 1.35 1.50 mA 0.0 0.5 5.0 µA 3 Conditions V 5.5 Current ICC Max Input Voltage Off-State Current IIN Typ LOW Level Output Voltage IOZ TA = −40°C to +85°C Min Output Voltage VOL TA = 25°C V CC (V) Parameter VIN = VIH IOH = −50 µA or VIL IOH = −8 mA VIN = VIH IOL = 50 µA or VIL IOL = 8 mA VIN = VIH or VIL VOUT = VCC or GND VIN = 5.5V or GND VIN = VCC or GND VIN = 3.4V Other Input = VCC or GND VOUT = 5.5V www.fairchildsemi.com 74VHCT244A Absolute Maximum Ratings(Note 2) 74VHCT244A Noise Characteristics Symbol Parameter TA = 25°C VCC (V) Typ Limits Units Conditions VOLP (Note 7) Quiet Output Maximum Dynamic VOL 5.0 0.9 1.1 V CL = 50 pF VOLV (Note 7) Quiet Output Minimum Dynamic VOL 5.0 −0.9 −1.1 V CL = 50 pF VIHD (Note 7) Minimum HIGH Level Dynamic Input Voltage 5.0 2.0 V CL = 50 pF VILD (Note 7) Maximum LOW Level Dynamic Input Voltage 5.0 0.8 V CL = 50 pF Note 7: Parameter guaranteed by design. AC Electrical Characteristics Symbol Parameter tPLH Propagation Delay tPHL Time tPZL 3-STATE Output tPZH Enable Time tPLZ 3-STATE Output tPHZ Disable Time tOSLH Output to tOSHL Output Skew CIN Input Capacitance COUT Output Capacitance CPD Power Dissipation Capacitance V CC (V) 5.0 ± 0.5 5.0 ± 0.5 5.0 ± 0.5 TA = 25°C Min Typ TA = −40°C to +85°C Max Min Max 5.4 7.4 1.0 8.5 5.9 8.4 1.0 9.5 7.7 10.4 1.0 12.5 Units ns 8.2 11.4 1.0 13.5 11.4 1.0 13.0 ns 1.0 1.0 ns 10 10 pF 4 CL = 15 pF ns 8.8 5.0 ± 0.5 Conditions 9 pF 18 pF CL = 50 pF RL = 1 kΩ CL = 15 pF CL = 50 pF RL = 1 kΩ CL = 50 pF (Note 8) VCC = Open VCC = 5.0V (Note 9) Note 8: Parameter guaranteed by design. tOSLH = |tPLH max − t PLH min|; tOSHL = |tPHL max − tPHL min| 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 F/F). The total CPD when n pcs. of the Octal D Flip-Flop operates can be calculated by the equation: CPD (total) = 20 + 12n. www.fairchildsemi.com 4 74VHCT244A 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 5 www.fairchildsemi.com 74VHCT244A 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 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. 74VHCT244A Octal Buffer/Line Driver with 3-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued)