Datasheet

DS3904/DS3905
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
_____________________________________________________________________ 3
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Fast mode 0 400
SCL Clock Frequency
(Note 7)
f
SCL
Standard mode 0 100
kHz
Fast mode 1.3
Bus Free Time between STOP
and START Conditions (Note 7)
t
BUF
Standard mode 4.7
µs
Fast mode 0.6
Hold Time (Repeated) START
Condition (Notes 7, 8)
t
HD:STA
Standard mode 4.0
µs
Fast mode 1.3
Low Period of SCL Clock
(Note 7)
t
LOW
Standard mode 4.7
µs
Fast mode 0.6
High Period of SCL Clock
(Note 7)
t
HIGH
Standard mode 4.0
µs
Fast mode 0 0.9
Data Hold Time
(Notes 7, 9)
t
HD:DAT
Standard mode 0 0.9
µs
Fast mode 100
Data Setup Time
(Note 7)
t
SU:DAT
Standard mode 250
ns
Fast mode 0.6
Start Setup Time t
SU:STA
Standard mode 4.7
µs
Fast mode 20 + 0.1C
B
300
Rise Time of Both SDA and SCL
Signals (Note 10)
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 10)
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
Line
C
B
(Note 10) 400 pF
EEPROM Write Time t
W
(Note 11) 10 20 ms
Startup Time t
ST
2ms
ANALOG RESISTOR CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
T
A
= +25°C (20k resistor) 14.5 20 25.5
Position 7Fh Resistance R
MAX
T
A
= +25°C (10k resistor) 8 10 12
k
Position 00h Resistance R
MIN
T
A
= +25°C 200 500 
High Impedance R
HIZ
5.5 M