Revised May 2000 DM74S240 • DM74S241 • DM74S244 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) ■ Typical IOH (source current) 64 mA −15 mA ■ Typical propagation delay times Inverting 4.5 ns Noninverting 6 ns ■ Typical enable/disable times 9 ns ■ Typical power dissipation (enabled) Inverting 450 mW Noninverting 538 mW Ordering Code: Order Number Package Number Package Description DM74S240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74S241N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74S244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Connection Diagrams DM74S241N DM74S240N DM74S244N © 2000 Fairchild Semiconductor Corporation DS006478 www.fairchildsemi.com DM74S240 • DM74S241 • DM74S244 Octal 3-STATE Buffer/Line Driver/Line Receiver August 1986 DM74S240 • DM74S241 • DM74S244 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 5.5V 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Recommended Operating Conditions Symbol Parameter Min Typ Max Units 4.75 5 5.25 V LOW Level Input Voltage 0.8 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL 2 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 64 mA TA Free Air Operating Temperature 70 °C 0 Electrical Characteristics over recommended operating free-air temperature range (unless otherwise noted) Symbol Parameter Conditions VI Input Clamp Voltage VCC = Min, II = −18 mA Hys Hysteresis (VT+ − VT−) VCC = Min Min Typ (Note 2) Max −1.2 0.2 Units V 0.4 V 3.4 V (Data Inputs Only) VOH HIGH Level VCC = 4.75V, VIH = 2V Output Voltage VIL = 0.8V, IOH = −1 mA 2.7 VCC = Min, VIH = 2V 2.4 VIL = 0.8V, IOH = −3 mA VCC = Min, VIH = 2V 2 VIL = 0.5V, IOH = Max VOL IOZH IOZL LOW Level VCC = Min IOL = Max Output Voltage VIL = 0.8V, VIH = 2V Off-State Output Current, VCC = Max VO = 2.4V HIGH Level Voltage Applied VIL = 0.8V Off-State Output Current, VIH = 2V VO = 0.5V LOW Level Voltage Applied II Input Current at Maximum VCC = Max VI = 5.5V 0.55 V 50 µA −50 µA 1 mA 50 µA Input Voltage IIH HIGH Level Input Current VCC = Max VI = 2.7V IIL LOW Level Input Current VCC = Max VI = 0.5V IOS Short Circuit Output Current VCC = Max (Note 3) ICC Supply Outputs HIGH Current Outputs LOW Outputs Disabled Any A −400 µA Any G −2 mA −225 mA −50 DM74S240 135 DM74S241, DM74244 95 160 DM74S240 100 150 DM74S241, DM74244 120 180 DM74S240 100 150 DM74S241, DM74S244 120 180 Note 2: All typical values are at VCC = 5V, TA = 25°C. Note 3: Not more than one output should be shorted at a time and duration should not exceed one second. www.fairchildsemi.com 80 2 mA VCC = 5V, TA = 25°C Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ tPLH tPHL tPZL tPZH Min Max Propagation Delay Time Parameter CL = 45 pF Conditions DM74S240 2 7 LOW-to-HIGH Level Output RL = 90Ω DM74S241, DM74244 2 9 Propagation Delay Time CL = 45 pF DM74S240 2 7 HIGH-to-LOW Level Output RL = 90Ω DM74S241, DM74244 2 9 Output Enable Time to CL = 45 pF DM74S240 3 15 LOW Level RL = 90Ω DM74S241, DM74244 3 15 Output Enable Time to CL = 45 pF DM74S240 2 10 HIGH Level RL= 90Ω DM74S241, DM74244 3 12 Output Disable Time CL = 5 pF DM74S240 4 15 from Low Level RL = 90Ω DM74S241, DM74244 2 15 Output Disable Time CL = 5 pF DM74S240 2 9 from High Level RL = 90Ω DM74S241, DM74244 2 9 Propagation Delay Time CL = 150 pF DM74S240 3 10 LOW-to-HIGH Level Output RL = 90Ω DM74S241, DM74244 4 12 Propagation Delay Time CL = 150 pF DM74S240 3 10 HIGH-to-LOW Level Output RL = 90Ω DM74S241, DM74244 4 12 Output Enable Time to CL = 150 pF DM74S240 6 21 LOW Level RL = 90Ω DM74S241, DM74244 6 21 Output Enable Time to CL = 150 pF DM74S240 4 12 HIGH Level RL = 90Ω DM74S241, DM74244 4 15 3 Units ns ns ns ns ns ns ns ns ns ns www.fairchildsemi.com DM74S240 • DM74S241 • DM74S244 Switching Characteristics DM74S240 • DM74S241 • DM74S244 Octal 3-STATE Buffer/Line Driver/Line Receiver Physical Dimensions inches (millimeters) unless otherwise noted 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 4