CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
5.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief
TB379
for details.
DC Operating Characteristics – RTC
Temperature = -40°C to +85°C, unless otherwise stated. Crystal load capacitance = 6pF.
Boldface limits apply over the operating temperature range, -40°C to +85°C.
SYMBOL
V
DD
V
DDT
I
DD1
PARAMETER
Full Operation Power Supply
Timekeeping Power Supply
Standby Supply Current
V
DD
= 3.6V
V
DD
= 3.3V
I
DD2
Timekeeping Current
V
DD
= 1.8V
V
DD
= 1.6V
I
DD3
I
LI
I
LO
Supply Current With I
2
C Active at Clock V
DD
= 3.6V
Speed of 400kHz
Input Leakage Current on SCL
I/O Leakage Current on SDA
-100
-100
CONDITIONS
MIN
(Note 8)
1.8
1.4
600
500
400
350
15
40
100
100
650
TYP
(Note 7)
MAX
(Note 8)
3.6
1.8
950
UNITS
V
V
nA
nA
nA
nA
µA
nA
nA
6
6, 11
6, 11
NOTES
IRQ1/F
OUT
and IRQ2
V
OL
Output Low Voltage
V
DD
= 1.8V, I
OL
= 3mA
0.4
V
Serial Interface Specifications
Over the recommended operating conditions unless otherwise specified.
Boldface limits apply over
the operating temperature range, -40°C to +85°C.
SYMBOL
V
IL
V
IH
PARAMETER
SDA and SCL Input Buffer LOW
Voltage
SDA and SCL Input Buffer HIGH
Voltage
TEST CONDITIONS
MIN
(Note 8)
-0.3
0.7 x V
DD
0.04 x V
DD
V
DD
+ 2
0
0.4
10
400
Any pulse narrower than the max spec
is suppressed.
50
TYP
(Note 7)
MAX
(Note 8)
0.3 x V
DD
5.5
UNITS NOTES
V
V
V
V
V
pF
kHz
ns
9
10
SERIAL INTERFACE SPECS
Hysteresis SDA and SCL Input Buffer
Hysteresis
V
PULLUP
V
OL
Cpin
f
SCL
t
IN
Maximum Pull-up voltage on
SDA during I
2
C communication
SDA Output Buffer LOW Voltage, V
DD
> 1.8V, V
PULLUP
= 5.0V
Sinking 3mA
SDA and SCL Pin Capacitance
SCL Frequency
Pulse width Suppression Time at
SDA and SCL Inputs
T
A
= +25°C, f = 1MHz, V
DD
= 5V,
V
IN
= 0V, V
OUT
= 0V
4
FN6755.2
September 25, 2015
ISL12057
Serial Interface Specifications
Over the recommended operating conditions unless otherwise specified.
Boldface limits apply over
the operating temperature range, -40°C to +85°C. (Continued)
SYMBOL
t
AA
PARAMETER
SCL Falling Edge to SDA Output
Data Valid
Time the Bus Must Be Free
Before the Start of a New
Transmission
Clock LOW Time
Clock HIGH Time
START Condition Setup Time
START Condition Hold Time
TEST CONDITIONS
SCL falling edge crossing 30% of V
DD
,
until SDA exits the 30% to 70% of V
DD
window.
SDA crossing 70% of V
DD
during a
STOP condition, to SDA crossing 70%
of V
DD
during the following START
condition
Measured at the 30% of V
DD
crossing
Measured at the 70% of V
DD
crossing
SCL rising edge to SDA falling edge.
Both crossing 70% of V
DD
From SDA falling edge crossing 30% of
V
DD
to SCL falling edge crossing 70%
of V
DD
From SDA exiting the 30% to 70% of
V
DD
window, to SCL rising edge
crossing 30% of V
DD
From SCL falling edge crossing 30% of
V
DD
to SDA entering the 30% to 70%
of V
DD
window
From SCL rising edge crossing 70% of
V
DD
, to SDA rising edge crossing 30%
of V
DD
From SDA rising edge to SCL falling
edge. Both crossing 70% of V
DD
From SCL falling edge crossing 30% of
V
DD
, until SDA enters the 30% to 70%
of V
DD
window
From 30% to 70% of V
DD
From 70% to 30% of V
DD
Maximum is determined by t
R
and t
F
For Cb = 400pF, max is about
2k to~2.5k.
For Cb = 40pF, max is about 15kto
~20k
1300
MIN
(Note 8)
TYP
(Note 7)
MAX
(Note 8)
900
UNITS NOTES
ns
10
t
BUF
ns
t
LOW
t
HIGH
t
SU:STA
t
HD:STA
1300
600
600
600
ns
ns
ns
ns
t
SU:DAT
Input Data Setup Time
100
ns
t
HD:DAT
Input Data Hold Time
0
900
ns
t
SU:STO
STOP Condition Setup Time
600
ns
t
HD:STO
t
DH
STOP Condition Hold Time
Output Data Hold Time
600
0
ns
ns
t
R
t
F
Cb
Rpu
SDA and SCL Rise Time
SDA and SCL Fall Time
SDA and SCL Bus Pull-Up
Resistor Off-Chip
20 + 0.1 x Cb
20 + 0.1 x Cb
10
1
300
300
400
ns
ns
pF
k
9
9, 10
9
9
Capacitive Loading of SDA or SCL Total on-chip and off-chip
NOTES:
6. IRQ1/F
OUT
inactive.
7. Typical values are for T = +25°C and 3.3V supply voltage.
8. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
9. These are I
2
C specific parameters and are not production tested; however, they are used to set conditions for testing devices to validate
specification.
10. Parts will work with SDA pull-up voltage above the V
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