54AC244 • 54ACT244 Octal Buffer/Line Driver with TRI-STATE ® Outputs General Description Features The ’AC/’ACT244 is an octal buffer and line driver designed to be employed as a memory address driver, clock driver and bus-oriented transmitter/receiver which provides improved PC board density. n ICC and IOZ reduced by 50% n TRI-STATE outputs drive bus lines or buffer memory address registers n Outputs source/sink 24 mA n ’ACT244 has TTL-compatible inputs n Standard Microcircuit Drawing (SMD) — ’AC244: 5962-87552 — ’ACT244: 5962-87760 Logic Symbol Pin Names IEEE/IEC Description OE1, OE2 TRI-STATE Output Enable Inputs I0–I7 Inputs O0–O7 Outputs DS100282-1 TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100282 www.national.com 54AC244 • 54ACT244 Octal Buffer/Line Driver with TRI-STATE Outputs August 1998 Connection Diagrams Truth Tables Inputs Pin Assignment for DIP and Flatpak OE1 Outputs In (Pins 12, 14, 16, 18) L L L L H H H X Z H = HIGH Voltage Level L = LOW Voltage Level Inputs OE2 Outputs In L L L L H H H X Z DS100282-2 X = Immaterial Z = High Impedance Pin Assignment for LCC DS100282-3 www.national.com 2 (Pins 3, 5, 7, 9) Absolute Maximum Ratings (Note 1) Recommended Operating Conditions If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (VCC) DC Input Diode Current (IIK) VI = −0.5V VI = VCC + 0.5V DC Input Voltage (VI) DC Output Diode Current (IOK) VO = −0.5V VO = VCC + 0.5V DC Output Voltage (VO) DC Output Source or Sink Current (IO) DC VCC or Ground Current per Output Pin (ICC or IGND) Storage Temperature (TSTG) Junction Temperature (TJ) CDIP Supply Voltage (VCC) ’AC ’ACT Input Voltage (VI) Output Voltage (VO) Operating Temperature (TA) 54AC/ACT Minimum Input Edge Rate (∆V/∆t) ’AC Devices VIN from 30% to 70% of VCC VCC @ 3.3V, 4.5V, 5.5V Minimum Input Edge Rate (∆V/∆t) ’ACT Devices VIN from 0.8V to 2.0V VCC @ 4.5V, 5.5V −0.5V to +7.0V −20 mA +20 mA −0.5V to VCC + 0.5V −20 mA +20 mA −0.5V to VCC + 0.5V ± 50 mA ± 50 mA −65˚C to +150˚C 2.0V to 6.0V 4.5V to 5.5V 0V to VCC 0V to VCC −55˚C to +125˚C 125 mV/ns 125 mV/ns Note 1: Absolute maximum ratings are those values beyond which damage to the device may occur. 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. National does not recommend operation of FACT ® circuits outside databook specifications. 175˚C DC Characteristics for ’AC Family Devices Symbol Parameter VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH Minimum High 3.0 2.1 Level Input 4.5 3.15 Voltage 5.5 3.85 Maximum Low 3.0 0.9 Level Input 4.5 1.35 Voltage 5.5 1.65 Minimum High 3.0 2.9 Level Output 4.5 4.4 Voltage 5.5 5.4 VOUT = 0.1V V or VCC − 0.1V V or VCC − 0.1V VOUT = 0.1V IOUT = −50 µA V (Note 2) VIN = VIL or VIH VOL 3.0 2.4 4.5 3.7 5.5 4.7 Maximum Low 3.0 0.1 Level Output 4.5 0.1 Voltage 5.5 0.1 −12 mA V IOH −24 mA −24 mA IOUT = 50 µA V (Note 2) VIN = VIL or VIH IIN Maximum Input 3.0 0.50 4.5 0.50 5.5 0.50 5.5 ± 1.0 12 mA V IOL 24 mA 24 mA µA VI = VCC, GND Leakage Current 3 www.national.com DC Characteristics for ’AC Family Devices Symbol Parameter (Continued) VCC 54AC TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits IOZ 5.5 ± 5.0 µA VI (OE) = VIL, VIH VI = VCC, VGND VO = VCC, GND 5.5 50 mA VOLD = 1.65V Max 5.5 −50 mA VOHD = 3.85V Min 5.5 80.0 µA VIN = VCC Maximum TRI-STATE Current IOLD IOHD (Note 3) Minimum Dynamic Output Current ICC Maximum Quiescent Supply Current or GND Note 2: All outputs loaded; thresholds on input associated with output under test. Note 3: Maximum test duration 2.0 ms, one output loaded at a time. Note 4: IIN and ICC @ 3.0V are guaranteed to be less than or equal to the respective limit @ 5.5V VCC. Note 5: ICC for 54AC @ 25˚C is identical to 74AC @ 25˚C. DC Characteristics for ’ACT Family Devices Symbol Parameter VCC 54ACT TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits VIH VIL VOH Minimum High Level 4.5 2.0 Input Voltage 5.5 2.0 Maximum Low Level 4.5 0.8 Input Voltage 5.5 0.8 Minimum High Level 4.5 4.4 Output Voltage 5.5 5.4 V VOUT = 0.1V V or VCC − 0.1V VOUT = 0.1V V or VCC − 0.1V IOUT = −50 µA (Note 6) VIN = VIL or VIH VOL 4.5 3.70 5.5 4.70 Maximum Low Level 4.5 0.1 Output Voltage 5.5 0.1 V IOH −24 mA −24 mA V IOUT = 50 µA (Note 6) VIN = VIL or VIH 4.5 0.50 5.5 0.50 IIN Maximum Input Leakage Current 5.5 IOZ Maximum TRI-STATE 5.5 ± 1.0 ± 5.0 V IOL µA µA Current VI = VCC, GND VI = VIL, VIH VO = VCC, GND ICCT Maximum ICC/Input 5.5 1.6 mA IOLD 5.5 50 mA VI = VCC − 2.1V VOLD = 1.65V Max IOHD (Note 7) Minimum Dynamic Output Current 5.5 −50 mA VOHD = 3.85V Min ICC Maximum Quiescent 5.5 80.0 µA VIN = VCC Supply Current or GND Note 6: All outputs loaded; thresholds on input associated with output under test. Note 7: Maximum test duration 2.0 ms, one output loaded at a time. Note 8: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C. www.national.com 4 24 mA 24 mA AC Electrical Characteristics 54AC TA = −55˚C VCC Symbol Parameter (V) to +125˚C CL = 50 pF (Note 9) tPLH tPHL tPZH tPZL Min Max Propagation Delay 3.3 1.0 12.5 Data to Output 5.0 1.0 9.5 Propagation Delay 3.3 1.0 12.0 Data to Output 5.0 1.0 9.0 Output Enable Time 3.3 1.0 11.5 5.0 1.0 9.0 3.3 1.0 13.0 5.0 1.0 10.5 3.3 1.0 12.5 5.0 1.0 10.5 3.3 1.0 13.0 5.0 1.0 11.0 Output Enable Time tPHZ Output Disable Time tPLZ Units Output Disable Time ns ns ns ns ns ns Note 9: Voltage Range 3.3 is 3.3V ± 0.3V Voltage Range 5.0 is 5.0V ± 0.5V AC Electrical Characteristics 54ACT TA = −55˚C VCC Symbol Parameter (V) to +125˚C CL = 50 pF (Note 10) tPLH Propagation Delay Units Min Max 5.0 1.0 10.0 ns 5.0 1.0 10.0 ns Data to Output tPHL Propagation Delay Data to Output tPZH Output Enable Time 5.0 1.0 9.5 ns tPZL Output Enable Time 5.0 1.0 11.0 ns tPHZ Output Disable Time 5.0 1.0 11.0 ns tPLZ Output Disable Time 5.0 1.0 11.5 ns Note 10: Voltage Range 5.0 is 5.0V ± 0.5V Capacitance Symbol CIN CPD Typ Units Input Capacitance Parameter 4.5 pF Power Dissipation 45.0 pF Conditions VCC = OPEN VCC = 5.0V Capacitance 5 www.national.com 6 Physical Dimensions inches (millimeters) unless otherwise noted 20-Terminal Ceramic Leadless Chip Carrier (L) NS Package Number E20A 20-Lead Ceramic Dual-In-Line Package (D) NS Package Number J20A 7 www.national.com 54AC244 • 54ACT244 Octal Buffer/Line Driver with TRI-STATE Outputs Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Ceramic Flatpak (F) NS Package Number W20A LIFE SUPPORT POLICY NATIONAL’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 NATIONAL 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 sysdevice or system whose failure to perform can be reatems which, (a) are intended for surgical implant into sonably expected to cause the failure of the life support the body, or (b) support or sustain life, and whose faildevice or system, or to affect its safety or effectiveness. ure 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. 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