Datasheet

AD7991/AD7995/AD7999
Rev. B | Page 9 of 28
I
2
C TIMING SPECIFICATIONS
Guaranteed by initial characterization. All values were measured with the input filtering enabled. C
B
refers to the capacitive load on the bus line,
with t
r
and t
f
measured between 0.3 V
DD
and 0.7 V
DD
(see Figure 2). Unless otherwise noted, V
DD
= 2.7 V to 5.5 V and T
A
= T
MIN
to T
MAX
.
Table 5.
Limit at t
MIN
, t
MAX
Parameter Conditions Min Typ Max Unit Description
f
SCL
1
Standard mode 100 kHz Serial clock frequency
Fast mode 400 kHz
High speed mode
C
B
= 100 pF maximum 3.4 MHz
C
B
= 400 pF maximum 1.7 MHz
t
1
1
Standard mode 4 μs t
HIGH
, SCL high time
Fast mode 0.6 μs
High speed mode
C
B
= 100 pF maximum 60 ns
C
B
= 400 pF maximum 120 ns
t
2
1
Standard mode 4.7 μs t
LOW
, SCL low time
Fast mode 1.3 μs
High speed mode
C
B
= 100 pF maximum 160 ns
C
B
= 400 pF maximum 320 ns
t
3
1
Standard mode 250 ns t
SU;DAT
, data setup time
Fast mode 100 ns
High speed mode 10 ns
t
4
1, 2
Standard mode 0 3.45 μs t
HD;DAT
, data hold time
Fast mode 0 0.9 μs
High Speed mode
C
B
= 100 pF maximum 0 70
3
ns
C
B
= 400 pF maximum 0 150 ns
t
5
1
Standard mode 4.7 μs t
SU;STA
, setup time for a repeated start condition
Fast mode 0.6 μs
High Speed mode 160 ns
t
6
1
Standard mode 4 μs t
HD;STA
, hold time for a repeated start condition
Fast mode 0.6 μs
High speed mode 160 ns
t
7
1
Standard mode 4.7 μs t
BUF
, bus-free time between a stop and a start condition
Fast mode 1.3 μs
t
8
1
Standard mode 4 μs t
SU;STO
, setup time for a stop condition
Fast mode 0.6 μs
High speed mode 160 ns
t
9
Standard mode 1000 ns t
RDA
, rise time of the SDA signal
Fast mode 20 + 0.1 C
B
300 ns
High speed mode
C
B
= 100 pF maximum 10 80 ns
C
B
= 400 pF maximum 20 160 ns