4
FN8099.2
May 8, 2006
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................... -65°C to +135°C
Storage Temperature ........................ -65°C to +150°C
Voltage on V
CC
, V
BACK
pin
(respect to ground)...............................-0.5V to 7.0V
Voltage on SCL, SDA, X1 and X2
pin (respect to ground) ............... -0.5V to 7.0V or 0.5V
above V
CC
or V
BACK
(whichever is higher)
DC Output Current .............................................. 5 mA
Lead Temperature (Soldering, 10 sec).............. 300°C
Stresses above those listed under “Absolute Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and the functional operation
of the device at these or any other conditions above
those indicated in the operational sections of this
specification is not implied. Exposure to absolute max-
imum rating conditions for extended periods may
affect device reliability.
DC OPERATING CHARACTERISTICS (Temperature = -40°C to +85°C, unless otherwise stated.)
OPERATING CHARACTERISTICS
Notes: (1) The device enters the Active state after any start, and remains active: for 9 clock cycles if the Device Select Bits in the Slave Address
Byte are incorrect or until 200nS after a stop ending a read or write operation.
(2) The device enters the Program state 200nS after a stop ending a write operation and continues for t
WC
.
(3) The device goes into the Timekeeping state 200nS after any stop, except those that initiate a nonvolatile write cycle; t
WC
after a stop
that initiates a nonvolatile write cycle; or 9 clock cycles after any start that is not followed by the correct Device Select Bits in the Slave
Address Byte.
(4) For reference only and not tested.
(5) V
IL
= V
CC
x 0.1, V
IH
= V
CC
x 0.9, f
SCL
= 400KHz
(6) V
CC
= 0V
(7) V
BACK
= 0V
(8) V
SDA
= V
SCL
=V
CC
, Others = GND or V
CC
Symbol Parameter Conditions Min Typ Max Unit Notes
V
CC
Main Power Supply 2.7 5.5 V
V
BACK
Backup Power Supply 1.8 5.5 V
V
CB
Switch to Backup Supply V
BACK
-0.2 V
BACK
-0.1 V
V
BC
Switch to Main Supply V
BACK
V
BACK
+0.2 V
Symbol Parameter Conditions Min Typ Max Unit Notes
I
CC1
Read Active Supply
Current
V
CC
= 2.7V 400 µA 1, 5, 7, 14
V
CC
= 5.0V 800 µA
I
CC2
Program Supply Current
(nonvolatile)
V
CC
= 2.7V 2.5 mA 2, 5, 7, 14
V
CC
= 5.0V 3.0 mA
I
CC3
Main Timekeeping
Current
V
CC
= 2.7V 10 µA 3, 7, 8, 14, 15
V
CC
= 5.0V 20 µA
I
BACK
Timekeeping Current –
(Low Voltage Sense
and Watchdog Timer
disabled
V
BACK
= 1.8V 1.25 µA 3, 6, 9, 14, 15
“See Perfor-
mance Data”
V
BACK
= 3.3V 1.5 µA
I
LI
Input Leakage Current 10 µA 10
I
LO
Output Leakage Current 10 µA 10
V
IL
Input LOW Voltage -0.5 V
CC
x 0.2 or
V
BACK
x 0.2
V13
V
IH
Input HIGH Voltage V
CC
x 0.7 or
V
BACK
x 0.7
V
CC
+ 0.5 or
V
BACK
+ 0.5
V13
V
HYS
Schmitt Trigger Input
Hysteresis
V
CC
related level .05 x V
CC
or
.05 x V
BACK
V13
V
OL1
Output LOW Voltage for
SDA and RESET
V
CC
= 2.7V 0.4 V 11
V
CC
= 5.5V 0.4
X1227
