Typical operating characteristics – Rainbow Electronics DS3903 User Manual
Page 4
DS3903
Triple 128-Position Nonvolatile
Digital Potentiometer
4
______________________________________________________________________
Note 1:
All voltages are referenced to ground.
Note 2:
I
STBY
specified for V
CC
equal to 3.0V and 5.0V while 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. WP must be disconnected or connected high.
Note 3:
I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
CC
is switched off.
Note 4:
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 5:
After this period, the first clock pulse is generated.
Note 6:
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 7:
A device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V
IN MIN
of
the SCL signal) in order to bridge the undefined region of the falling edge of SCL.
Note 8:
C
B
—total capacitance of one bus line in picofarads, timing referenced to 0.9 x V
CC
and 0.1 x V
CC
.
Note 9:
EEPROM write begins after a stop condition occurs.
Note 10:
Absolute linearity is used to measure expected wiper voltage as determined by wiper position in a
voltage-divider configuration.
Note 11:
Relative linearity is used to determine the change of wiper voltage between two adjacent wiper positions
in a voltage-divider configuration.
Typical Operating Characteristics
(V
CC
= 5.0V, 10k
Ω plots apply to both pot0 and pot2, T
A
= +25°C unless otherwise noted.)
10
20
30
40
50
60
70
80
90
100
0
W-L RESISTANCE
vs. WIPER SETTING (90k
Ω
)
DS3903 toc03
WIPER SETTING
W-L RESISTANCE (k
Ω
)
125
100
75
50
25
0
W-L RESISTANCE
vs. WIPER SETTING (10k
Ω
)
DS3903 toc02
WIPER SETTING
W-L RESISTANCE (k
Ω
)
125
100
75
50
25
0
2
4
6
8
10
0
STANDBY SUPPLY CURRENT
vs. TEMPERATURE
DS3903 toc01
TEMPERATURE (
°C)
SUPPLY CURRENT (
µ
A)
50
40
-30 -20 -10
10 20
0
30
20
40
60
80
100
120
140
160
0
-40
60 70 80
V
CC
= 5V
V
CC
= 3V