AD7991/AD7995/AD7999
Rev. B | Page 10 of 28
Limit at tMIN, tMAX
Parameter
Conditions
Min
Typ
Max
Unit
Description
t10
Standard mode
300
ns
tFDA, fall time of the SDA signal
Fast mode
20 + 0.1 CB
300
ns
High speed mode
CB = 100 pF maximum
10
80
ns
CB = 400 pF maximum
20
160
ns
t11
Standard mode
1000
ns
tRCL, rise time of the SCL signal
Fast mode
20 + 0.1 CB
300
ns
High speed mode
CB = 100 pF maximum
10
40
ns
CB = 400 pF maximum
20
80
ns
t11A
Standard mode
1000
ns
tRCL1, rise time of the SCL signal after a repeated
start condition and after an acknowledge bit
Fast mode
20 + 0.1 CB
300
ns
High speed mode
CB = 100 pF maximum
10
80
ns
CB = 400 pF maximum
20
160
ns
t12
Standard mode
300
ns
tFCL, fall time of the SCL signal
Fast mode
20 + 0.1 CB
300
ns
High speed mode
CB = 100 pF maximum
10
40
ns
CB = 400 pF maximum
20
80
ns
Fast mode
0
50
ns
Pulse width of the suppressed spike
High speed mode
0
10
ns
tPOWER-UP
0.6
μs
Power-up and acquisition time
1 Functionality is tested during production.
2 A device must provide a data hold time for SDA in order to bridge the undefined region of the SCL falling edge.
3 For 3 V supplies, the maximum hold time with
CB = 100 pF maximum is 100 ns maximum.
t6
t7
t2
t11
t4
t1
t12
t10
t5
t9
t6
t3
t8
0
64
61
-0
02
SCL
S
SDA
S = START CONDITION
P = STOP CONDITION
P
S
Figure 2. 2-Wire Serial Interface Timing Diagram