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AT90USB646 Datasheet(PDF) 409 Page - ATMEL Corporation |
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AT90USB646 Datasheet(HTML) 409 Page - ATMEL Corporation |
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409 / 434 page  409 7593A–AVR–02/06 AT90USB64/128 Table 30-7. External Data Memory Characteristics, 4.5 - 5.5 Volts, 1 Cycle Wait-state Symbol Parameter 8 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/t CLCL Oscillator Frequency 0.0 16 MHz 10 tRLDV Read Low to Data Valid 200 2.0tCLCL-50 ns 12 t RLRH RD Pulse Width 240 2.0t CLCL-10 ns 15 t DVWH Data Valid to WR High 240 2.0t CLCL ns 16 tWLWH WR Pulse Width 240 2.0tCLCL-10 ns Table 30-8. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 0 Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/t CLCL Oscillator Frequency 0.0 16 MHz 10 t RLDV Read Low to Data Valid 325 3.0t CLCL-50 ns 12 tRLRH RD Pulse Width 365 3.0tCLCL-10 ns 15 t DVWH Data Valid to WR High 375 3.0t CLCL ns 16 t WLWH WR Pulse Width 365 3.0t CLCL-10 ns Table 30-9. External Data Memory Characteristics, 4.5 - 5.5 Volts, SRWn1 = 1, SRWn0 = 1 Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/tCLCL Oscillator Frequency 0.0 16 MHz 10 t RLDV Read Low to Data Valid 325 3.0t CLCL-50 ns 12 tRLRH RD Pulse Width 365 3.0tCLCL-10 ns 14 tWHDX Data Hold After WR High 240 2.0tCLCL-10 ns 15 t DVWH Data Valid to WR High 375 3.0t CLCL ns 16 tWLWH WR Pulse Width 365 3.0tCLCL-10 ns Table 30-10. External Data Memory Characteristics, 2.7 - 5.5 Volts, No Wait-state Symbol Parameter 4 MHz Oscillator Variable Oscillator Unit Min Max Min Max 01/tCLCL Oscillator Frequency 0.0 8 MHz 1t LHLL ALE Pulse Width 235 t CLCL-15 ns 2tAVLL Address Valid A to ALE Low 115 0.5tCLCL-10 (1) ns 3a tLLAX_ST Address Hold After ALE Low, write access 55 ns |
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