CAT5171
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4
Table 5. CAPACITANCE
T
A
= 25°C, f = 1.0 MHz, V
DD
= 5 V
Symbol
Test Conditions Max Units
C
I/O
(Note 11)
Input/Output Capacitance (SDA, SCL) V
I/O
= 0V 8 pF
Table 6. POWER UP TIMING (Notes 11 and 12)
Symbol
Parameter Max Units
t
PUR
Power-up to Read Operation 1 ms
t
PUW
Power-up to Write Operation 1 ms
11. This parameter is tested initially and after a design or process change that affects the parameter.
12.t
PUR
and t
PUW
are delays required from the time V
CC
is stable until the specified operation can be initiated.
Table 7. DIGITAL POTENTIOMETER TIMING
Symbol Parameter Min Max Units
t
WRPO
Wiper Response Time After Power Supply Stable 50
ms
t
WR
Wiper Response Time: SCL falling edge after last bit of wiper position data byte to
wiper change
20
ms
Table 8. A.C. CHARACTERISTICS
V
DD
= +2.7 V to +5.5 V, −40°C to +85°C unless otherwise specified.
Symbol
Parameter Min Typ Max Units
f
SCL
Clock Frequency 400 kHz
t
HIGH
Clock High Period 600 ns
t
LOW
Clock Low Period 1300 ns
t
SU:STA
Start Condition Setup Time (for a Repeated Start Condition) 600 ns
t
HD:STA
Start Condition Hold Time 600 ns
t
SU:DAT
Data in Setup Time 100 ns
t
HD:DAT
Data in Hold Time 0 ns
t
SU:STO
Stop Condition Setup Time 600 ns
t
BUF
Time the bus must be free before a new transmission can start 1300 ns
t
R
SDA and SCL Rise Time 300 ns
t
F
SDA and SCL Fall Time 300 ns
t
DH
Data Out Hold Time 100 ns
T
I
Noise Suppression Time Constant at SCL, SDA Inputs 50 ns
t
AA
SCL Low to SDA Data Out and ACK Out 1
ms
