X1228S14 Intersil, X1228S14 Datasheet - Page 7

• Manufacturer Part Number: X1228S14
• Description: IC RTC CPU SUP WDT 4K EE 14-SOIC
• Manufacturer: Intersil
• Type: Clock/Calendar/EEPROMr

Specifications of X1228S14

• Memory Size: 4K (512 x 8)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Write Cycle Timing
Power-up Timing
Notes: (1) Delays are measured from the time V
Nonvolatile Write Cycle Timing
Note:
WATCHDOG TIMER/LOW VOLTAGE RESET OPERATING CHARACTERISTICS
Watchdog/Low Voltage Reset Parameters (SeeFigures 3 and 4)
Symbols
V
V
t
PURST
t
RVALID
t
t
t
PTRIP
WDO
Symbol
Symbol
RPD
RST
RSP
t
t
t
t
(2) Typical values are for T
t
(1) t
F
R
PUW
PUR
WC
SDA
SCL
the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
(1)
WC
(1)
V
(1)
CC
is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle. It is
slew rate should be between 0.2mV/µsec and 50mV/µsec.
Programmed Reset Trip Voltage
X1228-4.5A
X1228
X1228-2.7A
X1228-2.7
V
Power-up Reset Time-out Delay
V
V
Watchdog Timer Period (Crystal = 32.768kHz):
WD1 = 0, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 1, WD0 = 0
Watchdog Reset Time-out Delay (Crystal=32.768kHz)
2-Wire interface
Reset Valid V
CC
CC
CC
Detect to RESET LOW
Fall Time
Rise Time
Time from Power-up to Read
Time from Power-up to Write
Write Cycle Time
8th Bit of Last Byte
7
CC
A
= 25°C and V
Parameters
Parameter
Parameter
CC
CC
is stable until the specified operation can be initiated. These parameters are not 100% tested.
= 5.0V
ACK
X1228
Condition
Stop
Min.
Min.
Min.
4.50
4.25
2.75
2.55
100
725
225
225
1.7
1.0
10
10
1
t
WC
Typ.
Typ.
Typ.
4.63
4.38
2.85
2.65
1.75
5
250
750
250
250
(2)
(1)
Condition
Start
Max.
Max.
Max.
4.75
4.50
2.95
2.75
500
400
775
275
275
1.8
10
1
5
Unit
Units
Units
ms
ms
ms
ms
ns
µs
µs
µs
V
V
s
May 18, 2006
ms
ms
ms
FN8100.4