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EN80C251TB24 Datasheet(PDF) 6 Page - Intel Corporation |
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EN80C251TB24 Datasheet(HTML) 6 Page - Intel Corporation |
6 / 36 page Contents vi FIGURES Figure 1. 8xC251TB/TQ Block Diagram.................................................................................................... 1 Figure 2. The 8xC251TB/TQ Family Nomenclature .................................................................................. 2 Figure 3. 8xC251TB/TQ 44-pin PLCC Package........................................................................................ 4 Figure 4. 8xC251TB/TQ 40-pin PDIP Packages ....................................................................................... 5 Figure 5. External Bus Cycle: Code Fetch (Nonpage Mode) .................................................................. 18 Figure 6. External Bus Cycle: Data Read (Nonpage Mode) ................................................................... 19 Figure 7. External Bus Cycle: Data Write (Nonpage Mode).................................................................... 20 Figure 8. External Bus Cycle: Code Fetch (Page Mode) ........................................................................ 21 Figure 9. External Bus Cycle: Data Read (Page Mode).......................................................................... 22 Figure 10. External Bus Cycle: Data Write (Page Mode) .......................................................................... 23 Figure 11. External Bus Cycle: Code Fetch/Data Read (Nonpage Mode) ................................................ 24 Figure 12. External Bus Cycle: Data Write (Nonpage Mode).................................................................... 25 Figure 13. External Bus Cycle: Code Fetch/Data Read (Page Mode) ...................................................... 26 Figure 14. External Bus Cycle: Data Write (Page Mode) .......................................................................... 27 Figure 15. Serial Port Waveform — Shift Register Mode .......................................................................... 28 Figure 16. External Clock Drive Waveforms ............................................................................................. 29 Figure 17. AC Testing Input, Output Waveforms....................................................................................... 29 Figure 18. Float Waveforms ...................................................................................................................... 30 TABLES Table 1. Description of Product Nomenclature ........................................................................................2 Table 2. Proliferation Options .................................................................................................................. 3 Table 3. Package Information .................................................................................................................. 3 Table 4. 8xC251TB/TQ Pin Assignment .................................................................................................. 6 Table 5. 8xC251TB/TQ PLCC/DIP Pin Assignments Arranged by Functional Category ......................... 7 Table 6. Signal Descriptions ....................................................................................................................8 Table 7. Memory Signal Selections (RD1:0) ..........................................................................................10 Table 8. 8xC251TB/TQ Address Map .................................................................................................... 11 Table 9. DC Characteristics at VCC = 4.5 – 5.5 V ..................................................................................12 Table 10. AC Timing Symbol Definitions ..................................................................................................14 Table 11. AC Characteristics ................................................................................................................... 14 Table 12. Real-time Wait Timing Symbol Definitions ...............................................................................24 Table 13. Real-Time Wait AC Timing ....................................................................................................... 27 Table 14. Serial Port Timing — Shift Register Mode ...............................................................................28 Table 15. External Clock Drive ................................................................................................................ 29 Table 16. Thermal Characteristics ........................................................................................................... 30 |
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