Datasheet
DS3930
Hex Nonvolatile Potentiometer with
I/O and Memory
4 ______________________________________________________________________
Note 1: All voltages are referenced to ground.
Note 2: I
STBY
specified for V
CC
equal 3.0V and 5.0V, SDA = SCL = V
CC
, and I/O
0
= I/O
1
= I/O
2
= I/O
3
= A0 = A1 = A2 = GND.
Note 3: A fast-mode device can be used in a standard-mode system, but the requirement t
SU:DAT
> 250ns must then be met.
This is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does
stretch the LOW period of the SCL signal, it must output the next data bit to the SDA line t
RMAX
+ t
SU:DAT
= 1000ns
+250ns = 1250ns before the SCL line is released.
Note 4: After this period, the first clock pulse is generated.
Note 5: The maximum t
HD:DAT
has only to be met if the device does not stretch the LOW period (t
LOW
) of the SCL signal.
Note 6: A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IH MIN
of the SCL sig-
nal) in order to bridge the undefined region of the falling edge of SCL.
Note 7: C
B
—total capacitance of one bus line in picofarads, timing referenced to 0.9V
CC
and 0.1V
CC.
Note 8: EEPROM write begins after a STOP condition occurs.
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V; T
A
= -40°C to +85°C, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Fast mode 0 0.9
Data Hold Time (Notes 3, 5, 7)
t
HD:DAT
Standard mode 0 0.9
µs
Fast mode 100
Data Setup Time (Note 3)
t
SU:DAT
Standard mode 250
ns
Fast mode 0.6
Start Setup Time (Note 3) t
SU:STA
Standard mode 4.7
µs
Fast mode
20 + 0.1C
B
300
Rise Time of Both SDA and SCL
Signals (Note 7)
t
R
Standard mode
20 + 0.1C
B
1000
ns
Fast mode
20 + 0.1C
B
300
Fall Time of Both SDA and SCL
Signals (Note 7)
t
F
Standard mode
20 + 0.1C
B
300
ns
Fast mode 0.6
Setup Time for STOP Condition
t
SU:STO
Standard mode 4.0
µs
Capacitive Load for Each Bus
C
B
(Note 7) 400 pF
EEPROM Write Time t
W
(Note 8) 5 20 ms
EEPROM CHARACTERISTICS
(V
CC
= +2.7V to +5.5V; T
A
= -40°C to +85°C, unless otherwise specified.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Writes +70°C
50,000