Preliminary Information
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................... -65°C to +135°C
Storage Temperature......................... -65°C to +150°C
Voltage on V
CC
, V
BACK
and PHZ/IRQ
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
X1288
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 spec-
ification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
device reliability.
DC OPERATING CHARACTERISTICS
(Temperature = -40°C to +85°C, unless otherwise stated.)
Symbol
V
CC
V
BACK
V
CB
V
BC
Parameter
Main Power Supply
Backup Power Supply
Switch to Backup Supply
Switch to Main Supply
Conditions
Min
2.7
1.8
V
BACK
-0.2
V
BACK
Typ
Max
5.5
5.5
V
BACK
-0.1
V
BACK
+0.2
Unit
V
V
V
V
Notes
OPERATING CHARACTERISTICS
Symbol
I
CC1
I
CC2
I
CC3
I
BACK
Parameter
Read Active Supply
Current
Program Supply Current
(nonvolatile)
Main Timekeeping
Current
Timekeeping Current –
(Low Voltage Sense and
Watchdog Timer dis-
abled
Input Leakage Current
Output Leakage Current
Input LOW Voltage
Input HIGH Voltage
Schmitt Trigger Input
Hysteresis
Output LOW Voltage for
SDA and RESET
Output LOW Voltage for
PHZ/IRQ
Output HIGH Voltage for
PHZ/IRQ
Conditions
V
CC
= 2.7V
V
CC
= 5.0V
V
CC
= 2.7V
V
CC
= 5.0V
V
CC
= 2.7V
V
CC
= 5.0V
V
BACK
= 1.8V
V
BACK
= 3.3V
Min
Typ
Max
400
800
2.5
3.0
10
20
Unit
µA
µA
mA
mA
µA
µA
µA
µA
Notes
1, 5, 7, 14
2, 5, 7, 14
3, 7, 8, 14, 15
3, 6, 9, 14, 15
“See Perfor-
mance Data”
1.25
1.5
10
10
-0.5
V
CC
x 0.7 or
V
BACK
x 0.7
V
CC
x 0.2 or
V
BACK
x 0.2
V
CC
+ 0.5 or
V
BACK
+ 0.5
I
LI
I
LO
V
IL
V
IH
V
HYS
V
OL1
V
OL2
V
OH2
µA
µA
V
V
V
10
10
13
13
13
11
11
12
V
CC
related level
V
CC
= 2.7V
V
CC
= 5.5V
V
CC
= 2.7V
V
CC
= 5.5V
V
CC
= 2.7V
V
CC
= 5.5V
.05 x V
CC
or
.05 x V
BACK
0.4
0.4
V
CC
x 0.3
V
CC
x 0.3
V
CC
x 0.7
V
CC
x 0.7
V
V
V
REV 1.1.30 3/24/04
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