Revised March 2000 DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver General Description Features 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 133Ω. ■ 3-STATE outputs drive bus lines directly ■ PNP inputs reduce DC loading on bus lines ■ Hysteresis at data inputs improves noise margins ■ Typical IOL (sink current) 24 mA ■ Typical IOH (source current) −15 mA ■ Typical propagation delay times Inverting 10.5 ns Noninverting 12 ns ■ Typical enable/disable time 18 ns ■ Typical power dissipation (enabled) Inverting 130 mW Noninverting 135 mW Ordering Code: Order Number Package Number Package Description DM74LS244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74LS244SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74LS244N 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 Inputs Output G A L L Y L L H H H X Z L = LOW Logic Level H = HIGH Logic Level X = Either LOW or HIGH Logic Level Z = High Impedance © 2000 Fairchild Semiconductor Corporation DS008442 www.fairchildsemi.com DM74LS244 Octal 3-STATE Buffer/Line Driver/Line Receiver August 1986 DM74LS244 Absolute Maximum Ratings(Note 1) Supply Voltage 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 Input Voltage 7V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Nom Max Units 4.75 5 5.25 V LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 24 mA TA Free Air Operating Temperature 70 °C VCC Supply Voltage VIH HIGH Level Input Voltage VIL 2 V 0 Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) Symbol Parameter Min Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA HYS Hysteresis (VT+ − VT−) VCC = Min Typ Max (Note 2) −1.5 0.2 Units V 0.4 V 3.4 V Data Inputs Only VOH HIGH Level Output Voltage VCC = Min, VIH = Min 2.7 VIL = Max, IOH = −1 mA VCC = Min, VIH = Min 2.4 VIL = Max, IOH = −3 mA VCC = Min, VIH = Min 2 VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage VCC = Min IOL = 12 mA 0.4 VIL = Max IOL = Max 0.5 V VO = 2.7V 20 µA VIH = Min IOZH IOZL Off-State Output Current, VCC = Max HIGH Level Voltage Applied VIL = Max Off-State Output Current, VIH = Min VO = 0.4V −20 µA VCC = Max VI = 7V 0.1 mA 20 µA LOW Level Voltage Applied II Input Current at Maximum Input Voltage IIH HIGH Level Input Current VCC = Max VI = 2.7V IIL LOW Level Input Current VCC = Max V I = 0.4V IOS Short Circuit Output Current VCC = Max (Note 3) ICC Supply Current VCC = Max, Outputs HIGH 13 23 Outputs Open Outputs LOW 27 46 Outputs Disabled 32 54 Note 2: All typicals are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second. www.fairchildsemi.com 2 −0.5 −200 µA −40 −225 mA mA at VCC = 5V, TA = 25°C Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tPLH tPHL tPZL tPZH Parameter Conditions Propagation Delay Time CL = 45 pF LOW-to-HIGH Level Output RL = 667Ω Propagation Delay Time CL = 45 pF HIGH-to-LOW Level Output RL = 667Ω Output Enable Time to CL = 45 pF LOW Level RL = 667Ω Output Enable Time to CL = 45 pF HIGH Level RL = 667Ω Output Disable Time CL = 5 pF from LOW Level RL = 667Ω Output Disable Time CL = 5 pF from HIGH Level RL = 667Ω Propagation Delay Time CL = 150 pF LOW-to-HIGH Level Output RL = 667Ω Propagation Delay Time CL = 150 pF HIGH-to-LOW Level Output RL = 667Ω Output Enable Time to CL = 150 pF LOW Level RL = 667Ω Output Enable Time to CL = 150 pF HIGH Level RL = 667Ω 3 Max Units 18 ns 18 ns 30 ns 23 ns 25 ns 18 ns 21 ns 22 ns 33 ns 26 ns www.fairchildsemi.com DM74LS244 Switching Characteristics 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: 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