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| DM74LS245 3-STATE Octal Bus Transceiver August 1986 Revised March 2000 DM74LS245 3-STATE Octal Bus Transceiver General Description These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated. Features s Bi-Directional bus transceiver in a high-density 20-pin package s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at bus inputs improve noise margins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disable times 17 ns s IOL (sink current) 24 mA s IOH (source current) -15 mA Ordering Code: Order Number DM74LS245WM DM74LS245SJ DM74LS245N Package Number M20B M20D 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 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 Enable G L L H H = HIGH Level L = LOW Level X = Irrelevant Direction Control DIR L H X Operation B Data to A Bus A Data to B Bus Isolation (c) 2000 Fairchild Semiconductor Corporation DS006413 www.fairchildsemi.com DM74LS245 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage DIR or G A or B Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 0C to +70C -65C to +150C 7V 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. 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 Free Air Operating Temperature 0 Parameter Min 4.75 2 0.8 -15 24 70 Nom 5 Max 5.25 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol VI HYS VOH Parameter Input Clamp Voltage Hysteresis (VT+ - VT-) HIGH Level Output Voltage Conditions VCC = Min, II = -18 mA VCC = Min VCC = Min, VIH = Min VIL = Max, IOH = -1 mA VCC = Min, VIL = Min VIL = Max, IOH = -3 mA VCC = Min, VIH = Min VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage IOZH IOZL II IIH IIL IOS ICC Off-State Output Current, HIGH Level Voltage Applied Off-State Output Current, LOW Level Voltage Applied Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Short Circuit Output Current Supply Current VCC = Max, VI = 2.7V VCC = Max, VI = 0.4V VCC = Max (Note 3) Outputs HIGH Outputs LOW Outputs at Hi-Z Note 2: All typicals are at VCC = 5V, TA = 25C. Note 3: Not more than one output should be shorted at a time, not to exceed one second duration Min Typ (Note 2) 0.4 Max -1.5 Units V V 0.2 2.7 2.4 2 IOL = 12 mA IOL = Max VO = 2.7V VO = 0.4V A or B DIR or G VI = 5.5V VI = 7V 3.4 V VCC = Min VIL = Max VIH = Min VCC = Max VIL = Max VIH = Min VCC = Max 0.4 0.5 20 -200 0.1 0.1 20 -0.2 -40 48 VCC = Max 62 64 -225 70 90 95 mA V A A mA A mA mA www.fairchildsemi.com 2 DM74LS245 Switching Characteristics VCC = 5V, TA = 25C Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tPLH tPHL tPZL tPZH 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 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 CL = 150 pF RL = 667 CL = 5 pF RL = 667 Conditions CL = 45 pF RL = 667 Min Max 12 12 40 40 25 25 16 17 45 45 Units ns ns ns ns ns ns ns ns ns ns 3 www.fairchildsemi.com DM74LS245 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B www.fairchildsemi.com 4 DM74LS245 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.com DM74LS245 3-STATE Octal 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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