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AT90USB646 Datasheet(PDF) 410 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 410 Page - ATMEL Corporation |
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410 / 434 page  410 7593A–AVR–02/06 AT90USB64/128 Notes: 1. This assumes 50% clock duty cycle. The half period is actually the high time of the external clock, XTAL1. 2. This assumes 50% clock duty cycle. The half period is actually the low time of the external clock, XTAL1. 3b tLLAX_LD Address Hold after ALE Low, read access 55 ns 4tAVLLC Address Valid C to ALE Low 115 0.5tCLCL-10 (1) ns 5t AVRL Address Valid to RD Low 235 1.0t CLCL-15 ns 6t AVWL Address Valid to WR Low 235 1.0t CLCL-15 ns 7tLLWL ALE Low to WR Low 115 130 0.5tCLCL-10 (2) 0.5tCLCL+5 (2) ns 8t LLRL ALE Low to RD Low 115 130 0.5t CLCL-10 (2) 0.5t CLCL+5 (2) ns 9t DVRH Data Setup to RD High 45 45 ns 10 tRLDV Read Low to Data Valid 190 1.0tCLCL-60 ns 11 t RHDX Data Hold After RD High 0 0 ns 12 t RLRH RD Pulse Width 235 1.0t CLCL-15 ns 13 tDVWL Data Setup to WR Low 105 0.5tCLCL-20 (1) ns 14 t WHDX Data Hold After WR High 235 1.0t CLCL-15 ns 15 t DVWH Data Valid to WR High 250 1.0t CLCL ns 16 tWLWH WR Pulse Width 235 1.0tCLCL-15 ns Table 30-10. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state (Continued) Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max Table 30-11. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 0, SRWn0 = 1 Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/tCLCL Oscillator Frequency 0.0 8 MHz 10 t RLDV Read Low to Data Valid 440 2.0t CLCL-60 ns 12 tRLRH RD Pulse Width 485 2.0tCLCL-15 ns 15 tDVWH Data Valid to WR High 500 2.0tCLCL ns 16 t WLWH WR Pulse Width 485 2.0t CLCL-15 ns Table 30-12. External Data Memory Characteristics, 2.7 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0 Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/tCLCL Oscillator Frequency 0.0 8 MHz 10 t RLDV Read Low to Data Valid 690 3.0t CLCL-60 ns 12 t RLRH RD Pulse Width 735 3.0t CLCL-15 ns 15 tDVWH Data Valid to WR High 750 3.0tCLCL ns 16 t WLWH WR Pulse Width 735 3.0t CLCL-15 ns |
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