AT88SC0204C-SU ATMEL [ATMEL Corporation], AT88SC0204C-SU Datasheet - Page 4

• Manufacturer Part Number: AT88SC0204C-SU
• Description: CryptoMemory 2 Kbit
• Manufacturer: ATMEL [ATMEL Corporation]

Device Operation For
Synchronous
Protocols
4
Table 3. AC Characteristics
Applicable over recommended operating range from V
T
Symbol
AC
t
t
t
t
t
SU.STO
HD.STA
SU.STA
HD.DAT
SU.DAT
f
f
f
= -40
t
t
t
t
CLK
CLK
CLK
t
t
WR
WR
t
t
AA
DH
R
R
F
F
AT88SC0204C
o
C to +85
Parameter
Async Clock Frequency (V
Async Clock Frequency (V
Synch Clock Frequency
Clock Duty cycle
Rise Time - I/O, RST
Fall Time - I/O, RST
Rise Time - CLK
Fall Time - CLK
Clock Low to Data Out Valid
Start Hold Time
Start Set-up Time
Data In Hold Time
Data In Set-up Time
Stop Set-up Time
Data Out Hold Time
Write Cycle Time (at 25° C)
Write Cycle Time
o
C, CL = 30pF (unless otherwise noted)
CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an exter-
nal 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 Figure 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.
CC
CC
Range: +4.5 - 5.5V)
Range: +2.7 - 3.3V)
CC
= +2.7 to 5.5V,
Min
200
200
100
200
20
40
10
1
1
0
Max
9% x period
9% x period
60
35
1
5
4
1
1
5
7
2022HS–SMEM–04/07
Units
MHz
MHz
MHz
mS
mS
uS
uS
uS
nS
nS
nS
nS
nS
nS
uS
nS
%