Revised February 2000 DM74ALS240A • DM74ALS241A Octal 3-STATE Bus Driver General Description Features These octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS240A control inputs symmetrically enable the respective outputs when set logic LOW, while the DM74ALS241A has complementary enable gating. The 3-STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or rampdown. This eliminates bus glitching problems that arise during power-up and power-down. ■ Advanced low power Schottky TTL process oxide-isolated ion-implanted ■ Functional and pin compatible with the DM74LS counterpart ■ Improved switching performance with less power dissipation compared with the DM74LS counterpart ■ Switching response specified into 500Ω and 50 pF load ■ Switching response specifications guaranteed over full temperature and VCC supply range ■ PNP input design reduces input loading ■ Low level drive current: 74ALS = 24 mA Ordering Code: Order Number Package Number DM74ALS240AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Description DM74ALS240ASJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide DM74ALS240AN N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74ALS241AWM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74ALS241AN 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 Diagrams DM74ALS240A © 2000 Fairchild Semiconductor Corporation DM74ALS241A DS006210 www.fairchildsemi.com DM74ALS240A • DM74ALS241A Octal 3-STATE Bus Driver September 1986 DM74ALS240A • DM74ALS241A Function Tables DM74ALS240A Input DM74ALS241A Output Input Output Input Output G A Y 1G 1A Y 2G 2A Y L L H L L L H L L L H L L H H H H H H X Z H X Z L X Z Logic Diagrams DM74ALS240A www.fairchildsemi.com DM74ALS241A 2 Supply Voltage, VCC 7V Input Voltage 7V Voltage Applied to Disabled Output 5.5V 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. 0°C to +70°C Operating Free Air Temperature Range −65°C to +150°C Storage Temperature Range Typical θJA N Package 60.5°C/W M Package 79.8°C/W Recommended Operating Conditions Symbol Parameter Min Typ Max Units 4.5 5 5.5 V VCC Supply Voltage VIH HIGH Level Input Voltage VIL LOW Level Input Voltage 0.8 V IOH HIGH Level Output Current −15 mA IOL LOW Level Output Current 24 mA TA Operating Free Air Temperature 70 °C 2 V 0 Electrical Characteristics over recommended operating free-air temperature range (unless otherwise specified) Symbol Parameter Conditions Min VIK Input Clamp Voltage VCC = 4.5V, II = −18 mA VOH HIGH Level VCC = 4.5V to 5.5V IOH = −0.4 mA Output Voltage VCC = 4.5V IOH = −3 mA IOH = Max VOL II LOW Level VCC = 4.5V Output Voltage IOL = Max Input Current at Max Input Voltage Typ Max Units −1.5 V VCC − 2 V 2.4 V 2 V 0.35 VCC = 5.5V, VI = 7V 0.5 V 0.1 mA IIH HIGH Level Input Current VCC = 5.5V, VI = 2.7V 20 µA IIL LOW Level Input Current VCC = 5.5V, VIL = 0.4V −0.1 mA IO Output Drive Current VCC = 5.5V, VO = 2.25V −112 mA IOZH HIGH Level 3-STATE VCC = 5.5V, VO = 2.7V 20 µA VCC = 5.5V, VO = 0.4V −20 µA 4 10 mA Outputs LOW 13 23 mA Outputs 3-STATE 14 25 mA 9 15 mA Outputs LOW 15 26 mA Outputs 3-STATE 17 30 mA Output Current IOZL LOW Level 3-STATE Output Current ICC Supply Current VCC = 5.5V, ALS240A Outputs HIGH VCC = 5.5V, ALS241A Outputs HIGH 3 −30 www.fairchildsemi.com DM74ALS240A • DM74ALS241A Absolute Maximum Ratings(Note 1) DM74ALS240A • DM74ALS241A Switching Characteristics DM74ALS240A over recommended operating free air temperature range Symbol tPLH tPHL tPZH Parameter Conditions Propagation Delay Time VCC = 4.5V to 5.5V, LOW-to-HIGH Level Output CL = 50 pF, Propagation Delay Time R1 = 500Ω, HIGH-to-LOW Level Output R2 = 500Ω, Output Enable Time TA = Min to Max to HIGH Level Output tPZL From (Input) To (Output) A Y G Output Enable Time Output Disable Time from HIGH Level Output tPLZ G Output Disable Time Max Units 2 9 ns 2 9 ns 3 13 ns 3 18 ns 2 10 ns 3 12 ns Min Max Units 3 11 ns 3 10 ns 3 21 ns 3 21 ns 2 10 ns 3 15 ns 7 21 ns 7 21 ns 2 10 ns 3 15 ns Y to LOW Level Output tPHZ Min Y from LOW Level Output Switching Characteristics DM74ALS241A over recommended operating free air temperature range Symbol tPLH tPHL tPZH Parameter Conditions Propagation Delay Time VCC = 4.5V to 5.5V, LOW-to-HIGH Level Output CL = 50 pF, Propagation Delay Time R1 = 500Ω, HIGH-to-LOW Level Output R2 = 500Ω, Output Enable Time TA = Min to Max to HIGH Level Output tPZL From (Input) To (Output) A Y 1G Output Enable Time Y to HIGH Level Output tPHZ Output Disable Time to HIGH Level Output tPLZ 1G Output Disable Time Y to LOW Level Output tPZH Output Enable Time to HIGH Level Output tPZL 2G Output Enable Time Y to LOW Level Output tPHZ Output Disable Time from HIGH Level Output tPLZ 2G Output Disable Time from LOW Level Output www.fairchildsemi.com 4 Y DM74ALS240A • DM74ALS241A 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 DM74ALS240A • DM74ALS241A 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 DM74ALS240A • DM74ALS241A Octal 3-STATE Bus Driver 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 7 www.fairchildsemi.com