Datenblatt-Suchmaschine für elektronische Bauteile |
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DM74AS244WM Datenblatt(PDF) 1 Page - Fairchild Semiconductor |
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DM74AS244WM Datenblatt(HTML) 1 Page - Fairchild Semiconductor |
1 / 5 page © 2000 Fairchild Semiconductor Corporation DS006298 www.fairchildsemi.com 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 Communi- cation Systems. The output characteristics of the circuits have low impedance sufficient to drive terminated trans- mission lines down to 133 Ω. The input characteristics of the circuits likewise have a high impedance so it will not significantly load the transmission line. The package con- tains 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 unidi- rectional. The buffer selection includes inverting and non- inverting, with enable or disable 3-STATE control. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Improved switching performance with less power dissi- pation compared with Schottky counterpart s Functional and pin compatible with 74LS and Schottky counterpart s Switching response specified into 500 Ω and 50 pF s Specified to interface with CMOS at VOH = VCC − 2V Ordering Code: 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 DM74AS244 L = LOW Logic Level H = HIGH Logic Level X = Either LOW or HIGH Logic Level Z = High Impedance Order Number Package Number Package Description DM74AS240WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74AS240N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide DM74AS244WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide DM74AS244N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Inputs Output G AY LL H LH L HX Z Inputs Output G AY LL L LH H HX Z |
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