DM74ALS245AN

Revised February 2000 DM74ALS245A Octal 3-STATE Bus Transceiver General Description Features This advanced low power 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 ■ Glitch free bus during power up and down ■ 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 to reduce input loading ■ Switching specifications guaranteed over full temperature and VCC range Ordering Code: Order Number Package Number DM74ALS245AWM M20B DM74ALS245ASJ DM74ALS245AMSA DM74ALS245AN M20D Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MSA20 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 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 Operation DIR L L B Data to A Bus L H A Data to B Bus H X Hi-Z H = HIGH Logic Level L = LOW Logic Level X = Either HIGH or LOW Logic Level © 2000 Fairchild Semiconductor Corporation DS006213 www.fairchildsemi.com DM74ALS245A Octal 3-STATE Bus Transceiver September 1986 DM74ALS245A Absolute Maximum Ratings(Note 1) Supply Voltage 7V Input Voltage Control Inputs 7V I/O Ports 5.5V 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 Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Typical θJA N Package 53.0°C/W M Package 72.0°C/W Recommended Operating Conditions Symbol Parameter Min Typ Max 4.5 5 5.5 Units VCC Supply Voltage VIH HIGH Level Input Voltage V VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 24 mA TA Operating Free Air Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Symbol Parameter Conditions VIK Input Clamp Voltage VCC = 4.5V, IIN = −18 mA VOH HIGH Level VCC = 4.5V, IOH = −3 mA Min Max −1.5 VCC = 4.5V, IOH = Max Output Voltage Typ IOH = −0.4 mA, VCC = 4.5V to 5.5V V 2.4 3.2 V 2 2.3 V VCC − 2 V VOL LOW Level Output Voltage VCC = 4.5V IOL = 24 mA II Input Current at Maximum VCC = 5.5V VIN = 7V Control Inputs 0.1 VIN = 5.5V A or B Ports 0.1 Input Voltage Units 0.35 0.5 V mA IIH HIGH Level Input Current VCC = 5.5V, VIN = 2.7V 20 µA IIL LOW Level Input Current VCC = 5.5V, VIN = 0.4V −0.1 mA IO Output Drive Current VCC = 5.5V, VOUT = 2.25V ICC Supply Current VCC = 5.5V Switching Characteristics −112 mA Outputs HIGH −30 30 45 mA Outputs LOW 36 55 mA 3-STATE 38 58 mA Min Max Units 3 10 ns 3 10 ns (Note 2) over recommended operating free air temperature range Symbol tPLH Parameter Circuit Configuration Propagation Delay Time LOW-to-HIGH Level Output tPHL Propagation Delay Time HIGH-to-LOW Level Output tPZL Output Enable Time to LOW Level 5 20 ns tPZH Output Enable Time to HIGH Level 5 20 ns tPLZ Output Disable Time from LOW Level 4 15 ns tPHZ Output Disable Time from HIGH Level 2 10 ns Note 2: Switching characteristic conditions are VCC = 4.5V to 5.5V, RL = 500Ω, CL = 50 pF. www.fairchildsemi.com 2 DM74ALS245A 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 DM74ALS245A 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 DM74ALS245A Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm Wide Package Number MSA20 5 www.fairchildsemi.com DM74ALS245A Octal 3-STATE Bus Transceiver 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 6