LEVEL-TRANSLATING I
2
C BUS REPEATER
SCPS157A – DECEMBER 2007 – REVISED FEBRUARY 2008
www.ti.com
I
2
C Interface Timing Requirements
V
CCB
= 2.7 V to 5.5 V, GND = 0 V, T
A
= –40°C to 85°C (unless otherwise noted)
PARAMETER
FROM
(INPUT)
SDAB, SCLB
(2)
(see
SDAA, SCLA
(3)
(see
TO
(OUTPUT)
SDAA, SCLA
(2)
(see
SDAB, SCLB
(3)
(see
V
CCA
≤
2.7 V
(see
SDAB, SCLB
t
PZL
Propagation delay
SDAA, SCLA
(3)
(see
B side to A side
(see
A side to B side
(see
SDAB, SCLB
(3)
(see
SDAA, SCLA
2.7 V
≤
V
CCA
≤
3 V
(see
V
CCA
≥
3 V
(see
TEST CONDITIONS
MIN
100
25
15
20
10
45
1
20%
80%
20
V
CCA
≤
2.7 V
(see
B side to A side
t
THL
Transition time
80%
20%
2.7 V
≤
V
CCA
≤
3 V
(see Figure 2)
V
CCA
≥
3 V
(see
1
1
1
1
25
31
3
(4)
6
(5)
TYP
(1)
MAX UNIT
169
67
68
(4)
79
103
(5)
255
ns
110
110
130
ns
300
230
30
ns
170
105
120
ns
175
90
t
PLZ
Propagation delay
118
6
t
TLH
Transition time
A side to B side
(see
(1)
(2)
(3)
(4)
(5)
12
Typical values were measured with V
CCA
= V
CCB
= 2.7 V at T
A
= 25°C, unless otherwise noted.
The t
PLH
delay data from B to A side is measured at 0.5 V on the B side to 0.5 V
CCA
on the A side when V
CCA
is less than 2 V, and
1.5 V on the A side if V
CCA
is greater than 2 V.
The proportional delay data from A to B side is measured at 0.3 V
CCA
on the A side to 1.5 V on the B side.
Typical value measured with V
CCA
= 0.9 V at T
A
= 25°C
Typical value measured with V
CCA
= 5.5 V at T
A
= 25°C
6
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