Rainbow Electronics DS1845 - Manual (Page 11)

DS1845
11 of 13
AC ELECTRICAL CHARACTERISTICS (-40oC to 85oC, Vcc=2.7V to 5.5V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
SCL clock frequency fSCL 0
0 400
100 kHz *,6
**
Bus free time between
STOP and START
condition tBUF 1.3
4.7
µ
s *,6
**
Hold time (repeated)
START condition tHD:STA 0.6
4.0
µ
s *,7,6
**
Low period of SCL clock tLOW 1.3
4.7
µ
s *,6
**
High period of SCL clock tHIGH 0.6
4.0
µ
s *,6
**
Data hold time tHD:DAT 0
0 0.9
µ
s *,6,8
**
Data set-up time tSU:DAT 100
250 ns *,6
**
Start set-up time tSU:STA 0.6
4.7
µ
s *,6
**
Rise time of both SDA
and SCL signals tR 20+0.1
CB
300
1000
ns *,9
**
Fall time of both SDA
and SCL signals tF 20+0.1
CB
300
300 ns *,9
**
Set-up time for STOP
condition tSU:STO 0.6
4.0
µ
s *
**
Capacitive load for each
bus line CB 400 pF 9
EEPROM write time T
W
5 ms 10
* fast mode
** standard mode
NOTES :
1. All voltages are referenced to ground.
2. I
STBY
specified with for V
CC
equal 3.0V and 5.0V and control port logic pins are driven to the
appropriate logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of
ground or V
CC
for the corresponding inactive state.
3. I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
CC
is switched off.
4. Address Inputs, A0, A1, and A2, should be tied to either V
CC
or GND depending on the desired
address selections.
5. I
STBY
specified with for V
CC
equal 3.0V and 5.0V and control port logic pins are driven to the
appropriate logic levels. Appropriate logic levels specify that logic inputs are within a 0.5V of
ground or V
CC
for the corresponding inactive state.