DM74AS245WM

Revised February 2000 DM74AS245 Octal Bus Transceiver with 3-STATE Outputs General Description Features This advanced Schottky device contains 8 pairs of 3-STATE logic elements configured as octal bus transceivers. These circuits are designed for use in memory, microprocessor systems and in asynchronous bidirectional data buses. Two way communication between buses is controlled by the (DIR) input. Data transmits either from the A bus to the B bus or from the B bus to the A bus. Both the driver and receiver outputs can be disabled via the (G) enable input which causes outputs to enter the high impedance mode so that the buses are effectively isolated. ■ Advanced oxide-isolated, ion-implanted Schottky TTL process ■ Non-inverting logic output ■ 3-STATE outputs independently controlled on A and B buses ■ Low output impedance to drive terminated transmission lines to 133Ω ■ Switching response specified into 500Ω/50 pF ■ Specified to interface with CMOS at VOH = VCC − 2V ■ PNP inputs reduce input loading ■ Switching specifications guaranteed over full temperature and VCC range Ordering Code: Order Number Package Number DM74AS245WM M20B Package Description DM74AS245SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74AS245N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table Control Inputs G © 2000 Fairchild Semiconductor Corporation DS006299 Operation DIR L L B Data to A Bus L H A Data to B Bus H X Hi-Z www.fairchildsemi.com DM74AS245 Octal Bus Transceiver with 3-STATE Outputs October 1986 DM74AS245 Absolute Maximum Ratings(Note 1) Supply Voltage, VCC 7V Input Voltage Control Inputs 7V I/O Ports 5.5V Operating Free Air Temperature Range Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. 0°C to 70°C −65°C to +150°C Storage Temperature Range Typical θJA N Package 51.5°C/W M Package 76.0°C/W Recommended Operating Conditions Symbol Parameter Min Typ Max Units 4.5 5 5.5 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 48 mA TA Free Air Operating Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free air temperature range Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, IIN = −18 mA VOH HIGH Level Output VCC = 4.5V, IOH = −3 mA Min VCC = 4.5V, IOH = −15 mA Voltage IOH = −2 mA, VCC = 4.5V to 5.5V VOL LOW Level Output Voltage VCC = 4.5V, IOL = Max II Input Current at Max VCC = 5.5V, VIN = 7V, Typ 2.4 3.2 2 2.3 Input Voltage (VIN = 5.5V for A or B Ports) HIGH Level Input Current VCC = 5.5V, IIL LOW Level Input Current IO Output Drive Current VCC = 5.5V, VOUT = 2.25V ICC Supply Current VCC = 5.5V Units −1.2 V V VCC − 2 0.35 IIH Max Control Inputs VIN = 2.7V A or B Ports VCC = 5.5V, Control Inputs VIN = 0.4V A or B Ports 0.55 V 0.1 mA 20 70 −0.5 −0.75 −50 Output HIGH −150 62 µA mA mA 97 Output LOW 95 149 3-STATE 79 123 mA Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL Parameter Conditions Propagation Delay Time VCC = 4.5V to 5.5V, HIGH-to-LOW Level Output R1 = R2 = 500Ω, Propagation Delay Time CL = 50 pF HIGH-to-LOW Level Output From To Min Max Units A or B B or A 2 7.5 ns A or B B or A 2 7 ns ns tPZL Output Enable Time to LOW Level G A or B 2 8.5 tPZH Output Enable Time to HIGH Level G A or B 2 9 ns tPLZ Output Disable Time from LOW Level G A or B 2 9.5 ns tPHZ Output Disable Time from HIGH Level G A or B 2 5.5 ns www.fairchildsemi.com 2 DM74AS245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 3 www.fairchildsemi.com DM74AS245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D www.fairchildsemi.com 4 DM74AS245 Octal Bus Transceiver 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 5 www.fairchildsemi.com