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X1228S14I-2.7 Scheda tecnica(PDF) 7 Page - Xicor Inc.

Il numero della parte X1228S14I-2.7
Spiegazioni elettronici  Real Time Clock/Calendar/CPU Supervisor with EEPROM
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Produttore elettronici  XICOR [Xicor Inc.]
Homepage  http://www.xicor.com
Logo XICOR - Xicor Inc.

X1228S14I-2.7 Scheda tecnica(HTML) 7 Page - Xicor Inc.

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X1228
REV 1.3 3/24/04
Characteristics subject to change without notice.
7 of 31
www.xicor.com
Write Cycle Timing
Power Up Timing
Notes: (1)
Delays are measured from the time VCC is stable until the specified operation can be initiated. These parameters are not 100%
tested. VCC slew rate should be between 0.2mV/µsec and 50mV/µsec.
(2)
Typical values are for TA = 25°C and VCC = 5.0V
Nonvolatile Write Cycle Timing
Note:
(1) tWC 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 the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
WATCHDOG TIMER/LOW VOLTAGE RESET OPERATING CHARACTERISTICS
Watchdog/Low Voltage Reset Parameters (SeeFigures 3 and 4)
Symbol
Parameter
Min.
Typ.(2)
Max.
Units
tPUR
(1)
Time from Power Up to Read
1
ms
tPUW
(1)
Time from Power Up to Write
5
ms
Symbol
Parameter
Min.
Typ.(1)
Max.
Units
tWC
(1)
Write Cycle Time
5
10
ms
Symbols
Parameters
Min.
Typ.
Max.
Unit
VPTRIP
Programmed Reset Trip Voltage
X1228-4.5A
X1228
X1228-2.7A
X1228-2.7
4.50
4.25
2.75
2.55
4.63
4.38
2.85
2.65
4.75
4.50
2.95
2.75
V
tRPD
VCC Detect to RESET LOW
500
ns
tPURST
Power Up Reset Time-out Delay
100
250
400
ms
tF
VCC Fall Time
10
µs
tR
VCC Rise Time
10
µs
tWDO
Watchdog Timer Period (Crystal=32.768kHz):
WD1=0, WD0=0
WD1=0, WD0=1
WD1=1, WD0=0
1.7
725
225
1.75
750
250
1.8
775
275
s
ms
ms
tRST
Watchdog Reset Time-out Delay (Crystal=32.768kHz)
225
250
275
ms
tRSP
2-Wire interface
1
µs
VRVALID
Reset Valid VCC
1.0
V
SCL
SDA
tWC
8th Bit of Last Byte
ACK
Stop
Condition
Start
Condition


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