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| DM74AS240 * DM74AS244 3-STATE Bus Driver/Receiver October 1986 Revised March 2000 DM74AS240 * DM74AS244 3-STATE Bus Driver/Receiver General Description This family of Advance Schottky 3-STATE Bus circuits are designed to provide either bidirectional or unidirectional buffer interface in Memory, Microprocessor, and Communication Systems. The output characteristics of the circuits have low impedance sufficient to drive terminated transmission lines down to 133. The input characteristics of the circuits likewise have a high impedance so it will not significantly load the transmission line. The package contains eight 3-STATE buffers organized with four buffers having a common 3-STATE enable gate. The DM74AS240 and DM74AS244 are eight wide in a 20 pin package, and may be used as a 4 wide bidirectional or eight wide unidirectional. The buffer selection includes inverting and noninverting, with enable or disable 3-STATE control. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Improved switching performance with less power dissipation compared with Schottky counterpart s Functional and pin compatible with 74LS and Schottky counterpart s Switching response specified into 500 and 50 pF s Specified to interface with CMOS at VOH = VCC - 2V Ordering Code: Order Number DM74AS240WM DM74AS240N DM74AS244WM DM74AS244N Package Number M20B N20A M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 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 DM74AS240 DM74AS244 Function Tables DM74AS240 Inputs G L L H A L H X Output Y H L Z H = HIGH Logic Level DM74AS244 Inputs G L L H X = Either LOW or HIGH Logic Level Output A L H X Y L H Z L = LOW Logic Level Z = High Impedance (c) 2000 Fairchild Semiconductor Corporation DS006298 www.fairchildsemi.com DM74AS240 * DM74AS244 Absolute Maximum Ratings(Note 1) Supply Voltage, VCC Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 57.0C/W 76.0C/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 Free Air Operating Temperature 0 Parameter Min 4.5 2 0.8 -15 64 70 Nom 5 Max 5.5 Units V V V mA mA C Electrical Characteristics over recommended operating free air temperature range. All typical values are measured at VCC = 5V, TA = 25C. Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VOL II IIH IIL LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Conditions VCC = 4.5V, IIN = -18 mA VCC = 4.5V, IOH = -3 mA VCC = 4.5V, IOH = Max IOH = -2 mA, VCC = 4.5V to 5.5V VCC = 4.5V, IOL = Max VCC = 5.5V VIN = 7V Others Others AS240, (G, G), (Control Inputs), DM74AS244 (G) DM74AS244 (A) IOZH IOZL IO (Note 2) ICC HIGH Level 3-STATE Output Current VCC = 5.5V, V= 2.7V LOW Level 3-STATE Output Current Output Drive Current DM74AS240 Supply Current ICC DM74AS244 Supply Current VCC = 5.5V VCC = 5.5V, V = 0.4V VCC = 5.5V, VOUT = 2.25V VCC = 5.5V Outputs HIGH Outputs LOW 3-STATE Outputs HIGH Outputs LOW 3-STATE DM74AS240, DM74AS244 -50 -115 11 51 24 22 60 34 -1000 50 -50 -150 17 75 38 34 90 54 mA mA A A mA -500 A VCC = 5.5V, VIN = 2.7V VCC = 5.5V, VIN = 0.4V 2.4 2.4 VCC-2 0.35 0.55 100 20 V A A 3.2 V Min Typ Max -1.2 Units V Note 2: The output conditions have been chosen to produce a current that closely approximates one half the true short-circuit output current, I OS. www.fairchildsemi.com 2 DM74AS240 * DM74AS244 DM74AS240 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output tPZL tPZH tPLZ tPHZ Output Enable to LOW Level Output Enable to HIGH Level Output Disable from LOW Level Output Disable from HIGH Level Conditions VCC = 4.5V to 5.5V R1 = R2 = 500 CL = 50 pF From (Input) A A G G G G To (Output) Y Y Y Y Y Y Min 2 2 2 2 2 2 Max 6.5 5.7 9 6.4 9.5 5 Units ns ns ns ns ns ns DM74AS244 Switching Characteristics over recommended operating free air temperature range Symbol tPLH tPHL tPZL tPZH tPLZ tPHZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable to LOW Level Output Enable to HIGH Level Output Disable from LOW Level Output Disable from HIGH Level Conditions VCC = 4.5V to 5.5V R1 = R2 = 500 CL = 50 pF From (Input) A A G G G G To (Output) Y Y Y Y Y Y Min 2 2 2 2 2 2 Max 6.2 6.2 7.5 9 9 6 Units ns ns ns ns ns ns 3 www.fairchildsemi.com DM74AS240 * DM74AS244 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 DM74AS240 * DM74AS244 3-STATE Bus Driver/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 reasonably expected to result in a significant injury to the user. 5 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 www.fairchildsemi.com |
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