MAX6917
I
2
C-Compatible RTC with Microprocessor
Supervisor, Alarm, and NV RAM Controller
6 _______________________________________________________________________________________
Note 1: V
RST
is the reset threshold for V
CC
. See the Selector Guide section.
Note 2: All parameters are 100% tested at T
A
= +85°C. Limits overtemperature are guaranteed by design and are not
production tested.
FAST I
2
C-BUS TIMING (Figure 2 (Note 9))
SCL Clock Frequency f
SCL
(Note 10)
800 400,000
t
TIMEOUT
12s
Bus Free Time Between STOP
and START Conditions
t
BUF
1.3
µs
Hold Time After (Repeated)
START Conditions
t
HD:STA
After this period, the first clock is generated 0.6
µs
Repeated START Condition
Setup Time
t
HD:STA
0.6
µs
STOP Condition Setup Time
t
SU:STO
0.6
t
HD:DAT
0.9
t
SU:DAT
100
1.3
µs
SCL High Period t
HIGH
0.6
SCL/SDA Rise Time (Receiving)
0.1 × C
b
300
ns
SCL/SDA Fall Time (Receiving) t
F
(Notes 12, 13)
20 +
0.1 × C
b
300
SCL/SDA Fall Time (Transmitting)
0.1 × C
b
250
Pulse Width of Spike Suppressed
50
ns
Capacitive Load for Each Bus
Line
C
b
400
pF
BATTERY-TEST TIMING (Figure 18)
Battery Test to BATT_LO Active t
BL
(Note 8) 1 s
Battery-Test Cycle—Normal t
BTCN
(Note 8) 24 hr
Battery-Test Pulse Width t
BTPW
(Note 8) 1 s
AC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
V
CC
= 0, V
BATT
= 2V,
I
OH
= -100µA
V
OUT
-
0.1V
V
CC
= 2.7V, V
BATT
= 0,
I
OH
= -1mA
V
OUT
-
0.3V
32kHz and 1Hz
OUT High Voltage
V
OH
V
CC
= 4.5V, V
BATT
= 0,
I
OH
= -2mA
V
OUT
-
0.4V
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Notes 1, 2)
