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| DM74ALS645A Octal Bus Transceivers March 1987 Revised February 2000 DM74ALS645A Octal Bus Transceivers General Description These octal bus transceivers are designed for asynchronous two-way communication between data busses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus depending upon the level at the direction control (DIR) input. The enable input (G) can be used to disable the device so the busses are effectively isolated. Features s Advanced Oxide-isolated Ion-implanted Schottky TTL process s Switching performance is guaranteed over full temperature and VCC supply range s Switching performance specified at 50 pF s PNP input design reduces input loading Ordering Code: Order Number DM74ALS645AWM DM74ALS645AN Package Number M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 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 Logic Diagram Function Table Control Inputs G L L H DIR L H X B Data to A Bus A Data to B Bus Isolation Operation L = LOW Logic Level H = HIGH Logic Level X = Either LOW or HIGH Logic Level (c) 2000 Fairchild Semiconductor Corporation DS009304 www.fairchildsemi.com DM74ALS645A Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage; Control Inputs I/O Ports Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 53.0C/W 72.0C/W 7V 5.5V 0C to +70C -65C to +150C 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. 7V Recommended Operating Conditions Symbol VCC VIH VIL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Operating Free Air Temperature Range 0 Parameter Min 4.5 2 0.8 -15 24 70 Typ 5 Max 5.5 Units V V V mA mA C Electrical Characteristics Over Recommended Free Air Temperature Range Symbol VIC VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VCC = 4.5 to 5.5V VCC = Max VOL II IIH IIL IO ICC LOW Level Output Voltage Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current VCC = Max, VI = 2.7V (Note 2) VCC = Max, VI = 0.4V (Note 2) VCC = Max, VO = 2.25V VCC = Max Outputs HIGH Outputs LOW Outputs Disabled Note 2: For I/O ports, IIH and IIL parameters include the 3-STATE output current (IOZL and IOZH). Test Conditions VCC = Min, II = -18 mA IOH = -0.4 mA IOH = - 3 mA IOH = Max VCC = Min VCC = Max IOL = 12 mA IOL = 24 mA I/O Ports, VI = 5.5V Control Inputs, VI = 7V Min VCC - 2 2.4 2 Typ Max -1.5 Units V V 3.2 0.25 0.35 0.4 0.5 100 100 20 -100 V A A A mA mA -30 30 36 38 -112 45 55 58 Switching Characteristics Over Recommended Operating Free Air Temperature Range Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output From (Input) A or B A or B G G G G To (Output) B or A B or A A or B A or B A or B A or B Conditions VCC = 4.5 to 5.5V, CL = 50 pF, R1 = R2 = 500 Min 3 3 5 5 2 4 Max 10 10 20 20 10 15 Units ns ns ns ns ns ns www.fairchildsemi.com 2 DM74ALS645A 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 DM74ALS645A Octal Bus Transceivers 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: 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 4 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. www.fairchildsemi.com |
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