Datasheet

TCA7408
www.ti.com
SCPS235B NOVEMBER 2011REVISED MARCH 2013
ELECTRICAL CHARACTERISTICS
PARAMETER TEST CONDITIONS V
CCI
V
CCP
MIN TYP MAX UNIT
V
IK
Input diode clamp voltage I
I
= –18 mA 1.65 V to 5.5 V 1.65 V to 3.6 V –1.2 V
V
POR
Power-on reset voltage
(1)
V
I
= V
CCP
or GND, I
O
= 0 1.65 V to 3.6 V 1.65 V to 3.6 V 1 1.4 V
1.65 V 1.65 V 1.2
I
OH
= –6 mA 2.3 V 2.3 V 1.8 V
3 V 3 V 2.6
V
OH
GPIO-port high-level output voltage
1.65 V 1.65 V 1.1
I
OH
= –10 mA 2.3 V 2.3 V 1.7 V
3 V 3 V 2.5
1.65 V 1.65 V 0.45
I
OL
= 6 mA 2.3 V 2.3 V 0.25 V
3 V 3 V 0.25
V
OL
GPIO-port low-level output voltage
1.65 V 1.65 V 0.6
I
OL
= 10 mA 2.3 V 2.3 V 0.3 V
3 V 3 V 0.25
1.65 V to 5.5 V 1.65 V to 3.6 V 10
SDA
(2)
I
OL
V
OL
= 0.4 V 2.3 to 5.5 V 2.3 to 3.6 V 20 mA
INT 1.65 V to 5.5 V 1.65 V to 3.6 V 3
V
I
= V
CCI
or GND 1.65 V to 5.5 V 1.65 V to 3.6 V ±0.1
I
I
SCL, SDA, RESET, ADDR μA
V
I
= V
CCP
or GND ±0.1
I
IH
V
I
= V
CCP
1.65 V to 5.5 V 1.65 V to 3.6 V 1
GPIO port μA
I
IL
V
I
= GND 1
(1) When power (from 0 V) is applied to V
CCP
, an internal power-on reset holds the TCA7408 in a reset condition until V
CCP
has reached
V
POR
. At that time, the reset condition is released, and the TCA7408 registers and I
2
C/SMBus state machine initialize to their default
states. After that, V
CCP
must be lowered to below 0.2 V and back up to the operating voltage for a power-reset cycle.
(2) I
OL
for SDA is specified for standard mode, fast mode, and fast mode plus capability (at 2.3 V).
ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER TEST CONDITIONS VCCI VCCP MIN TYP
(1)
MAX UNIT
V
I
on SDA, ADDR, and
RESET
= V
CCI
or 3.6 V to 5.5 V 3.6 V 4 9
GND, V
I
on GPIO port = V
CCP
or
Fast Mode
SDA, GPIO port,
2.3 V to 3.6 V 2.3 V to 3.6 V 6.5 15
μA
ADDR, RESET GND, I
O
= 0, I/O = inputs,
Operating mode
1.65 V to 2.3 V 1.65 V to 2.3 V 10 20
f
SCL
= 400 kHz
I
CC
(I
CCI
+ I
CCP
)
3.6 V to 5.5 V 3.6 V 1.5 7
V
I
on SCL, SDA and RESET = V
CCI
or
SCL, SDA, GPIO port,
Standby mode GND, V
I
on GPIO port and ADDR = V
CCI
2.3 V to 3.6 V 2.3 V to 3.6 V 1 3.2 μA
ADDR, RESET
or GND, I
O
= 0, I/O = inputs, f
SCL
= 0
1.65 V to 2.3 V 1.65 V to 2.3 V 0.5 1.7
One input at V
CCI
– 0.6 V,
ΔI
CCI
SCL, SDA, RESET 1.65 V to 5.5 V 1.65 V to 3.6 V 25 μA
Other inputs at V
CCI
or GND
Additional current
in standby mode
One input at V
CCP
– 0.6 V,
ΔI
CCP
GPIO port, ADDR 1.65 V to 5.5 V 1.65 V to 3.6 V 80 μA
Other inputs at V
CCP
or GND
C
i
SCL V
I
= V
CCI
or GND 1.65 V to 5.5 V 1.65 V to 3.6 V 6 pF
SDA V
IO
= V
CCI
or GND 7
C
io
1.65 V to 5.5 V 1.65 V to 3.6 V pF
GPIO port V
IO
= V
CCP
or GND 7.5
R
PU
Pull up resistor V
I
= GND 1.65 V to 5.5 V 1.65 V to 3.6 V 100 kΩ
R
PD
Pull down resistor V
I
= V
CCP
1.65 V to 5.5 V 1.65 V to 3.6 V 100 kΩ
(1) All typical values are at nominal supply voltage (1.8V, 2.5V, 3.3V, or 5V VCC) and T
A
= 25°C.
I2C INTERFACE TIMING REQUIREMENTS
STANDARD MODE FAST MODE
UNIT
I
2
C BUS I
2
C BUS
PARAMETER
MIN MAX MIN MAX
f
scl
0 100 0 400 kHz
I
2
C clock frequency
t
sch
4 0.6 μs
I
2
C clock high time
t
scl
4.7 1.3 μs
I
2
C clock low time
t
sp
50 50 ns
I
2
C spike time
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