74LS244

DM74LS244 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

■ 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: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Function Table L = LOW Logic Level H = HIGH Logic Level X = Either LOW or HIGH Logic Level Z = High Impedance 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 Inputs Output G AY LLL LHH HXZ

www.fairchildsemi.com 2 DM74LS244 Absolute Maximum Ratings(Note 1) 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

Electrical Characteristics

over recommended operating free air temperature range (unless otherwise noted) 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. Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Symbol Parameter Min Nom Max Units V CC Supply Voltage 4.75 5 5.25 V VIH HIGH Level Input Voltage 2 V VIL 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 0 70 °C Symbol Parameter Conditions Min Typ Max Units (Note 2) VI Input Clamp Voltage V CC = Min, II = −18 mA −1.5 V HYS Hysteresis (V T+ − VT−)V CC = Min 0.2 0.4 V Data Inputs Only VOH HIGH Level Output Voltage V CC = Min, VIH = Min 2.7 VIL = Max, IOH = −1 mA VCC = Min, VIH = Min 2.4 3.4 V VIL = Max, IOH = −3 mA VCC = Min, VIH = Min VIL = 0.5V, IOH = Max VOL LOW Level Output Voltage V CC = Min I OL = 12 mA 0.4 VVIL = Max I OL = Max 0.5 VIH = Min IOZH Off-State Output Current, V CC = Max V O = 2.7V 20 µA HIGH Level Voltage Applied V IL = Max IOZL Off-State Output Current, V IH = Min V O = 0.4V −20 µA LOW Level Voltage Applied II Input Current at Maximum V CC = Max V I = 7V 0.1 mA Input Voltage IIH HIGH Level Input Current V CC = Max V I = 2.7V 20 µA IIL LOW Level Input Current V CC = Max V I = 0.4V −0.5 −200 µA IOS Short Circuit Output Current V CC = Max (Note 3) −40 −225 mA ICC Supply Current V CC = Max, Outputs HIGH 13 23 Outputs Open Outputs LOW 27 46 mA Outputs Disabled 32 54

3 www.fairchildsemi.com DM74LS244 Switching Characteristics at VCC = 5V, TA = 25°C Symbol Parameter Conditions Max Units tPLH Propagation Delay Time C L = 45 pF 18 ns LOW-to-HIGH Level Output R L = 667Ω tPHL Propagation Delay Time C L = 45 pF 18 ns HIGH-to-LOW Level Output R L = 667Ω tPZL Output Enable Time to C L = 45 pF 30 ns LOW Level R L = 667Ω tPZH Output Enable Time to C L = 45 pF 23 ns HIGH Level R L = 667Ω tPLZ Output Disable Time C L = 5 pF 25 ns from LOW Level R L = 667Ω tPHZ Output Disable Time C L = 5 pF 18 ns from HIGH Level R L = 667Ω tPLH Propagation Delay Time C L = 150 pF 21 ns LOW-to-HIGH Level Output R L = 667Ω tPHL Propagation Delay Time C L = 150 pF 22 ns HIGH-to-LOW Level Output R L = 667Ω tPZL Output Enable Time to C L = 150 pF 33 ns LOW Level R L = 667Ω tPZH Output Enable Time to C L = 150 pF 26 ns HIGH Level R L = 667Ω

www.fairchildsemi.com 4 DM74LS244 Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B

5 www.fairchildsemi.com DM74LS244 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 6 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 rea- sonably expected to result in a significant injury to the user. 2. A critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com