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| DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver August 1986 Revised March 2000 DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver General Description These buffers/line drivers are designed to improve both the performance and PC board density of 3-STATE buffers/ drivers employed as memory-address drivers, clock drivers, and bus-oriented transmitters/receivers. Featuring 400 mV of hysteresis at each low current PNP data line input, they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133. Features s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at data inputs improves noise margins s Typical IOL (sink current) 24 mA s Typical IOH (source current) -15 mA s Typical propagation delay times Inverting Noninverting 10.5 ns 12 ns 18 ns s Typical enable/disable time Inverting Noninverting 130 mW 135 mW s Typical power dissipation (enabled) Ordering Code: Order Number DM74LS244WM DM74LS244SJ DM74LS244N 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 Inputs G L L H L = LOW Logic Level H = HIGH Logic Level X = Either LOW or HIGH Logic Level Z = High Impedance Output A L H X Y L H Z (c) 2000 Fairchild Semiconductor Corporation DS008442 www.fairchildsemi.com DM74LS244 Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 7V 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. 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-) Data Inputs Only HIGH Level Output Voltage VCC = Min, VIH = Min VIL = Max, IOH = -1 mA VCC = Min, VIH = Min VIL = Max, IOH = -3 mA VCC = Min, VIH = Min VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage VCC = Min VIL = Max VIH = Min 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 VCC = Max VCC = Max (Note 3) VCC = Max, Outputs Open Note 2: All typicals are at VCC = 5V, TA = 25C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. Conditions VCC = Min, II = -18 mA VCC = Min Min Typ (Note 2) Max -1.5 Units V V 0.2 0.4 2.7 2.4 2 IOL = 12 mA IOL = Max VO = 2.7V VO = 0.4V VI = 7V VI = 2.7V V I = 0.4V Outputs HIGH Outputs LOW Outputs Disabled -0.5 -40 13 27 32 0.4 0.5 20 -20 0.1 20 -200 -225 23 46 54 mA V A A mA A A mA 3.4 V VCC = Max VIL = Max VIH = Min VCC = Max www.fairchildsemi.com 2 DM74LS244 Switching Characteristics at 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 = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 45 pF RL = 667 CL = 5 pF RL = 667 CL = 5 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 CL = 150 pF RL = 667 Conditions Max 18 18 30 23 25 18 21 22 33 26 Units ns ns ns ns ns ns ns ns ns ns 3 www.fairchildsemi.com DM74LS244 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 DM74LS244 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 DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver 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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