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| DM74ALS245A Octal 3-STATE Bus Transceiver September 1986 Revised February 2000 DM74ALS245A Octal 3-STATE Bus Transceiver General Description 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. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Non-inverting logic output s Glitch free bus during power up and down s 3-STATE outputs independently controlled on A and B buses s Low output impedance to drive terminated transmission lines to 133 s Switching response specified into 500/50 pF s Specified to interface with CMOS at VOH = VCC - 2V s PNP inputs to reduce input loading s Switching specifications guaranteed over full temperature and VCC range Ordering Code: Order Number DM74ALS245AWM DM74ALS245ASJ DM74ALS245AMSA DM74ALS245AN Package Number M20B M20D MSA20 N20A 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 20-Lead Shrink Small Outline Package (SSOP), EIAJ TYPE II, 5.3mm 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 Function Table Control Inputs G L L H DIR L H X B Data to A Bus A Data to B Bus Hi-Z Operation H = HIGH Logic Level L = LOW Logic Level X = Either HIGH or LOW Logic Level (c) 2000 Fairchild Semiconductor Corporation DS006213 www.fairchildsemi.com DM74ALS245A 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 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 operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage 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 Conditions VCC = 4.5V, IIN = -18 mA VCC = 4.5V, IOH = -3 mA VCC = 4.5V, IOH = Max IOH = -0.4 mA, VCC = 4.5V to 5.5V VCC = 4.5V VCC = 5.5V IOL = 24 mA VIN = 7V VIN = 5.5V VCC = 5.5V, VIN = 2.7V VCC = 5.5V, VIN = 0.4V VCC = 5.5V, VOUT = 2.25V VCC = 5.5V Outputs HIGH Outputs LOW 3-STATE -30 30 36 38 Control Inputs A or B Ports 2.4 2 VCC - 2 0.35 0.5 0.1 0.1 20 -0.1 -112 45 55 58 3.2 2.3 Min Typ Max -1.5 Units V V V V V mA A mA mA mA mA mA Switching Characteristics Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to LOW Level Output Enable Time to HIGH Level Output Disable Time from LOW Level Output Disable Time from HIGH Level (Note 2) Circuit Configuration Min 3 3 5 5 4 2 Max 10 10 20 20 15 10 Units ns ns ns ns ns ns over recommended operating free air temperature range Note 2: Switching characteristic conditions are VCC = 4.5V to 5.5V, RL = 500, 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: 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 6 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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