54AC245,54ACT245 54AC245 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs Literature Number: SNOS099 54AC245 • 54ACT245 Octal Bidirectional Transceiver with TRI-STATE ® Inputs/Outputs General Description Features The ’AC/’ACT245 contains eight non-inverting bidirectional buffers with TRI-STATE outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-HIGH) enables data from A ports to B ports; Receive (active-LOW) enables data from B ports to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a HIGH Z condition. n n n n n n ICC and IOZ reduced by 50% Noninverting buffers Bidirectional data path A and B outputs source/sink 24 mA ’ACT245 has TTL-compatible inputs Standard Microcircuit Drawing (SMD) — ’AC245: 5962-87758 — ’ACT245: 5962-87663 Logic Symbols IEEE/IEC DS100283-1 DS100283-2 Pin Description Names OE Output Enable Input T/R Transmit/Receive Input A0–A7 Side A TRI-STATE Inputs or TRI-STATE Outputs B0–B7 Side B TRI-STATE Inputs or TRI-STATE Outputs TRI-STATE ® is a registered trademark of National Semiconductor Corporation. FACT ® is a registered trademark of Fairchild Semiconductor Corporation. © 1998 National Semiconductor Corporation DS100283 www.national.com 54AC245 • 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/Outputs August 1998 Connection Diagrams Pin Assignment for DIP and Flatpak Pin Assignment for LCC DS100283-4 Truth Table Inputs OE DS100283-3 L L Bus B Data to Bus A L H Bus A Data to Bus B H X HIGH-Z State H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial www.national.com 2 Outputs T/R 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 VOUT = 0.1V V or VCC − 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 µA 24 mA VI = VCC, GND 24 mA 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 IOLD IOHD (Note 3) Minimum Dynamic Output Current ICC Maximum Quiescent 5.5 50 mA VOLD = 1.65V Max 5.5 −50 mA VOHD = 3.85V Min 5.5 80.0 µA VIN = VCC µA or GND VI(OE) = VIL, VIH VI = VCC, GND Supply Current IOZT Maximum I/O Leakage Current ± 5.5 5.5 VO = VCC, 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. 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 5) 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 5) VIN = VIL or VIH IIN ICCT 4.5 0.50 5.5 0.50 V IOL 24 mA Maximum Input Leakage Current 5.5 ± 1.0 µA VI = VCC, GND Maximum 5.5 1.6 mA VI = VCC − 2.1V 5.5 50 mA VOLD = 1.65V Max 5.5 −50 mA VOHD = 3.85V Min 5.5 80.0 µA VIN = VCC 24 mA ICC/Input IOLD IOHD (Note 6) Minimum Dynamic Output Current ICC Maximum Quiescent Supply Current www.national.com or GND 4 DC Characteristics for ’ACT Family Devices Symbol Parameter (Continued) VCC 54ACT TA = (V) −55˚C to +125˚C Units Conditions Guaranteed Limits IOZT VI (OE) = VIL, VIH VI = VCC, GND VO = VCC, GND Maximum I/O Leakage Current ± 5.0 5.5 µA Note 5: All outputs loaded; thresholds on input associated with output under test. Note 6: Maximum test duration 2.0 ms, one output loaded at a time. Note 7: ICC for 54ACT @ 25˚C is identical to 74ACT @ 25˚C. AC Electrical Characteristics 54AC TA = −55˚C VCC Symbol Parameter (V) (Note 8) tPLH tPHL tPZH tPZL tPHZ tPLZ Fig. to +125˚C CL = 50 pF Units Min Max Propagation Delay 3.3 1.0 11.5 An to Bn or Bn to An 5.0 1.0 8.5 Propagation Delay 3.3 1.0 10.0 An to Bn or Bn to An 5.0 1.0 7.5 Output Enable Time 3.3 1.0 13.5 5.0 1.0 10.0 3.3 1.0 14.5 5.0 1.0 10.5 3.3 1.0 13.5 5.0 1.0 10.5 3.3 1.0 14.0 5.0 1.0 10.5 Output Enable Time Output Disable Time Output Disable Time No. ns ns ns ns ns ns Note 8: 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 9) tPLH Propagation Delay Units Min Max 5.0 1.0 9.0 ns 5.0 1.0 10.0 ns An to Bn or Bn to An tPHL Propagation Delay An to Bn or Bn to An tPZH Output Enable Time 5.0 1.0 12.0 ns tPZL Output Enable Time 5.0 1.0 13.0 ns tPHZ Output Disable Time 5.0 1.0 12.0 ns tPLZ Output Disable Time 5.0 1.0 12.0 ns Note 9: Voltage Range 5.0 is 5.0V ± 0.5V 5 www.national.com Capacitance Symbol CIN CI/O Typ Units Input Capacitance Parameter 4.5 pF Input/Output 15.0 pF Conditions VCC = OPEN VCC = 5.0V 45.0 pF VCC = 5.0V Capacitance CPD Power Dissipation Capacitance 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 54AC245 • 54ACT245 Octal Bidirectional Transceiver with TRI-STATE Inputs/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. 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