Revised April 2005 74VHCT244A Octal Buffer/Line Driver with 3-STATE Outputs General Description Features 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 3-STATE 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. ■ High Speed: tPD 5.9 ns (typ) at VCC 5V ■ Power down protection is provided on inputs and outputs ■ Low power dissipation: ICC 4 PA (max) @ TA 25qC ■ Pin and function compatible with 74HCT244 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 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 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 © 2005 Fairchild Semiconductor Corporation Connection Diagram DS500003 www.fairchildsemi.com 74VHCT244A Octal Buffer/Line Driver with 3-STATE Outputs March 1997 74VHCT244A Pin Descriptions Pin Names Description OE1, OE2 3-STATE Output Enable Inputs I0–I7 Inputs O0–O7 3-STATE Outputs Truth Tables Inputs Outputs OE1 In (Pins 12, 14, 16, 18) L L L L H H H X Z Inputs Outputs OE2 In (Pins 3, 5, 7, 9) L L L L H H H X Z H HIGH Voltage Level L LOW Voltage Level I Immaterial Z High Impedance www.fairchildsemi.com 2 Recommended Operating Conditions (Note 6) 0.5V to 7.0V 0.5V to 7.0V Supply Voltage (VCC) DC Input Voltage (VIN) 4.5V to 5.5V Supply Voltage (VCC) DC Output Voltage (VOUT ) 0V to 5.5V Input Voltage (VIN) (Note 3) (Note 4) Input Diode Current (IIK) Output Diode Current (IOK) (Note 5) DC Output Current (IOUT ) DC VCC/GND Current (ICC) Storage Temperature (TSTG) 0.5V to VCC 0.5V 0.5V to 7.0V 20 mA r20 mA r25 mA r75 mA 65qC to 150qC Output Voltage (VOUT) 0V to VCC 0V to 5.5V 40qC to 85qC Operating Temperature (TOPR) Input Rise and Fall Time (tr, tf) VCC 5.0V r 0.5V 0 ns/V a 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) 260qC (Soldering, 10 seconds) (Note 3) (Note 4) 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 40qC to 85qC 4.5 2.0 2.0 Input Voltage 5.5 2.0 2.0 Typ Max Min Max 4.5 0.8 0.8 Input Voltage 5.5 0.8 0.8 HIGH Level LOW Level 3-STATE Output Input Leakage 4.5 4.5 4.40 4.50 3.94 0.0 Units Conditions V LOW Level Off-State Current IIN TA HIGH Level Output Voltage IOZ 25qC Min Output Voltage VOL TA V CC (V) Parameter V 4.40 V 3.80 V 0.1 0.1 V 0.36 0.44 V VIN VIH IOH or VIL IOH VIN VIH IOL or VIL IOL VIN 50 PA 8 mA 50 PA 8 mA VIH or VIL 5.5 r0.25 r2.5 PA 0–5.5 r0.1 r1.0 PA VIN 5.5V or GND 5.5 4.0 40.0 PA VIN VCC or GND 5.5 1.35 1.50 mA VIN 3.4V VOUT VCC or GND Current ICC Quiescent Supply Current ICCT Maximum ICC/Input Other Input IOFF Output Leakage Current 0.0 0.5 5.0 PA VOUT VCC or GND 5.5V (Power Down State) 3 www.fairchildsemi.com 74VHCT244A Absolute Maximum Ratings(Note 2) 74VHCT244A Noise Characteristics Symbol Parameter TA 25qC 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 V CC (V) 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 5.0 r 0.5 5.0 r 0.5 5.0 r 0.5 25qC TA Min Typ TA Max 40qC to 85qC Min Max Units Conditions 5.4 7.4 1.0 8.5 5.9 8.4 1.0 9.5 7.7 10.4 1.0 12.5 8.2 11.4 1.0 13.5 8.8 11.4 1.0 13.0 ns RL 1.0 1.0 ns (Note 8) 10 10 pF VCC Open 9 pF VCC 5.0V 18 pF (Note 9) 5.0 r 0.5 4 CL 15 pF CL 50 pF 1 k: CL 15 pF CL 50 pF 1 k: CL 50 pF ns ns RL Capacitance COUT Output Capacitance CPD Power Dissipation Capacitance 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 5 www.fairchildsemi.com 74VHCT244A 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 www.fairchildsemi.com 6 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 7 www.fairchildsemi.com 74VHCT244A 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 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. 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 device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure 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 user. www.fairchildsemi.com www.fairchildsemi.com 8