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| DM74ALS1240A Octal 3-STATE Bus Driver September 1986 Revised February 2000 DM74ALS1240A Octal 3-STATE Bus Driver General Description 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, and are low power dissipation versions of the DM74ALS240A and DM74ALS241A. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS1240A control inputs symmetrically enable the respective outputs when set logic LOW. The 3STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or ramp-down. This eliminates bus glitching problems that arise during power-up and power-down. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Switching response specified into 500 and 50 pF load s Switching response specifications guaranteed over full temperature and VCC supply range s PNP input design reduces input loading s Low power dissipation version s Low level drive current: 74ALS = 16 mA Ordering Code: Order Number DM74ALS1240AWM Package Number M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code. Connection Diagram Logic Diagram Function Table Input G L L H A L H X Output Y H L Z H = HIGH Level Logic State L = LOW Level Logic State X = Don't Care (Either LOW or HIGH Level Logic State) Z = High Impedance (OFF) State (c) 2000 Fairchild Semiconductor Corporation DS006261 www.fairchildsemi.com DM74ALS1240A Absolute Maximum Ratings(Note 1) Supply Voltage Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 60.5C/W 78.0C/W 7V 7V 5.5V 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 Operating Free Air Temperature 0 Parameter Min 4.5 2 0.8 -15 16 70 Typ 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range (unless otherwise specified) Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VOL II IIH IIL IO IOZH IOZL ICC LOW Level Output Voltage Input Current at Maximum Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current HIGH Level 3-STATE Output Current LOW Level 3-STATE Output Current Supply Current VCC = 5.5V, VI = 7V VCC = 5.5V, VI = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V, VO = 2.7V VCC = 5.5V, VO = 0.4V VCC = 5.5V Outputs 3-STATE Outputs HIGH Outputs LOW 5 8 8 -30 VCC = 4.5V to 5.5V VCC = 4.5V VCC = 4.5V Conditions VCC = 4.5V, II = -18 mA IOH = -0.4 mA IOH = -3 mA IOH = Max IOL = 12 mA IOL = 24 mA VCC - 2 2.4 2 0.25 0.35 0.4 0.5 0.1 20 -0.1 -112 20 -20 8 14 13 Min Typ Max -1.2 Units V V V V V V mA A mA mA A A mA mA mA www.fairchildsemi.com 2 DM74ALS1240A Switching Characteristics over recommended operating free air temperature range VCC = 4.5V to 5.5V, CL = 50 pF, Symbol Parameter From (Input) tPLH tPHL tPZH tPZL tPHZ tPLZ Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output G Y 3 13 ns G Y 6 2 22 10 ns ns A Y 2 4 13 20 ns ns To (Output) R1 = 500, R2 = 500, TA = Min to Max Min 2 Max 13 ns Units 3 www.fairchildsemi.com DM74ALS1240A Octal 3-STATE Bus Driver Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B 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 4 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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