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AT88SC12816C-WI Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT88SC12816C-WI Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 21 page 6 AT88SC12816C 5016KS–SMEM–08/09 Table 3. AC Characteristics Applicable over recommended operating range from VCC = +2.7 to 5.5V, TAC = -40°C to +85°C, CL = 30pF (unless otherwise noted) Symbol Parameter Min Max Units fCLK Async Clock Frequency (VCC Range: +4.5 - 5.5V) 1 5 MHZ fCLK Async Clock Frequency (VCC Range: +2.7 - 3.3V) 1 4 MHZ fCLK Synch Clock Frequency 0 1 MHZ Clock Duty cycle 40 60 % tR Rise Time - I/O, RST 1 μS tF Fall Time - I/O, RST 1 μS tR Rise Time - CLK 9% x period μS tF Fall Time - CLK 9% x period μS tAA Clock Low to Data Out Valid 35 nS tHD.STA Start Hold Time 200 nS tSU.STA Start Set-up Time 200 nS tHD.DAT Data In Hold Time 10 nS tSU.DAT Data In Set-up Time 100 nS tSU.STO Stop Set-up Time 200 nS tDH Data Out Hold Time 20 nS tWR Write Cycle Time (at 25°C) 5 mS tWR Write Cycle Time (-40° to +85°C) 7 mS 4. 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 8). 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 8). 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 Figure 6 on page 8). 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. |
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