AT88SC25616C-MP Ver la hoja de datos (PDF) - Atmel Corporation
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Fabricante
AT88SC25616C-MP Datasheet PDF : 18 Pages
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Table 3. AC Characteristics
Applicable over recommended operating range from VCC = +2.7 to 5.5V,
TAC = -40oC to +85oC, CL = 30pF (unless otherwise noted)
Symbol Parameter
Min
fCLK
Async Clock Frequency (VCC Range: +4.5 - 5.5V)
1
fCLK
Async Clock Frequency (VCC Range: +2.7 - 3.3V)
1
fCLK
Synch Clock Frequency
0
Clock Duty cycle
40
tR
Rise Time - I/O, RST
tF
Fall Time - I/O, RST
tR
Rise Time - CLK
tF
Fall Time - CLK
tAA
Clock Low to Data Out Valid
tHD.STA Start Hold Time
200
tSU.STA Start Set-up Time
200
tHD.DAT Data In Hold Time
10
tSU.DAT Data In Set-up Time
100
tSU.STO Stop Set-up Time
200
tDH
Data Out Hold Time
20
tWR
Write Cycle Time (at 25⋅C)
tWR
Write Cycle Time ( -40o to +85oC)
Max
5
4
1
60
1
1
9% x period
9% x period
35
5
7
Units
MHz
MHz
MHz
%
uS
uS
uS
uS
nS
nS
nS
nS
nS
nS
nS
mS
mS
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.
4 AT88SC25616C
5017HS–SMEM–11/08
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