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AT88SC6416C-PU Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT88SC6416C-PU Datasheet(HTML) 4 Page - ATMEL Corporation |
4 / 18 page 4 5015HS–SMEM–11/08 AT88SC6416C Device Operation For Synchronous Protocols CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an external device. Data on the SDA pin may change only during SCL low time periods (see Figure 5 on page 5). Data changes during SCL high periods will indicate a start or stop condition as defined below. START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (see Figure 6 on page 6). STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition. After a read sequence, the stop command will place the EEPROM in a standby power mode (see Fig- ure 6 on page 6). ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero to acknowledge that it has received each word. This happens during the ninth clock cycle. MEMORY RESET: After an interruption in protocol, power loss or system reset, any 2-wire part can be reset by following these steps: 1. Clock up to 9 cycles. 2. Look for SDA high in each cycle while SCL is high. 3. Create a start condition. Table 3. AC Characteristics Applicable over recommended operating range from VCC = +2.7 to 5.5V, TAC = -40 oC to +85oC, CL = 30pF (unless otherwise noted) Symbol Parameter Min Max Units f CLK Async Clock Frequency (V CC Range: +4.5 - 5.5V) 1 5 MHz fCLK Async Clock Frequency (VCC Range: +2.7 - 3.3V) 1 4 MHz f CLK Synch Clock Frequency 0 1 MHz Clock Duty cycle 40 60 % t R Rise Time - I/O, RST 1 uS tF Fall Time - I/O, RST 1 uS t R Rise Time - CLK 9% x period uS tF Fall Time - CLK 9% x period uS tAA Clock Low to Data Out Valid 35 nS t HD.STA Start Hold Time 200 nS tSU.STA Start Set-up Time 200 nS t HD.DAT Data In Hold Time 10 nS tSU.DAT Data In Set-up Time 100 nS t SU.STO Stop Set-up Time 200 nS tDH Data Out Hold Time 20 nS t WR Write Cycle Time (at 25 ⋅C) 5 mS t WR Write Cycle Time (-40o to +85oC) 7 mS |
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