Datasheet

AD7992
Rev. 0 | Page 5 of 28
I
2
C TIMING SPECIFICATIONS
Guaranteed by initial characterization. All values measured with the input filtering enabled. C
B
refers to the capacitive load on the bus
line. t
r
and t
f
measured between 0.3 V
DD
and 0.7 V
DD
.
High speed mode timing specifications apply to the AD7992-1 only. Standard and fast mode timing specifications apply to both the
AD7992-0 and the AD7992-1. See Figure 2. Unless otherwise noted, V
DD
= 2.7 V to 5.5 V; REF
IN
= 2.5 V to V
DD
; T
A
=T
MIN
to T
MAX
.
Table 3.
Limit at T
MIN
, T
MAX
Parameter Conditions Min Max Unit Description
f
SCL
Standard mode 100 kHz Serial clock frequency
Fast mode 400 kHz
High speed mode
C
B
= 100 pF max 3.4 MHz
C
B
= 400 pF max 1.7 MHz
t
1
Standard mode 4 µs t
HIGH
, SCL high time
Fast mode 0.6 µs
High speed mode
C
B
= 100 pF max 60 ns
C
B
= 400 pF max 120 ns
t
2
Standard mode 4.7 µs t
LOW
, SCL low time
Fast mode 1.3 µs
High speed mode
C
B
= 100 pF max 160 ns
C
B
= 400 pF max 320 ns
t
3
Standard mode 250 ns t
SU;DAT
, data setup time
Fast mode 100 ns
High speed mode 10 ns
t
4
1
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 max 0 70
2
ns
C
B
= 400 pF max 0 150 ns
t
5
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
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
Standard mode 4.7 µs t
BUF
, bus free time between a STOP and a START condition
Fast mode 1.3 µs
t
8
Standard mode 4 µs t
SU;STO
, setup time for STOP condition
Fast mode 0.6 µs
High speed mode 160 ns
t
9
Standard mode 1000 ns t
RDA
, rise time of SDA signal
Fast mode 20 + 0.1 C
B
300 ns
High speed mode
C
B
= 100 pF max 10 80 ns
C
B
= 400 pF max 20 160 ns
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