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參數(shù)資料
| 型號： | X1228V14Z-4.5A |
| 廠商： | INTERSIL CORP |
| 元件分類： | XO, clock |
| 英文描述： | 16 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO14 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-153AC, TSSOP-14 |
| 文件頁數(shù)： | 27/31頁 |
| 文件大小： | 569K |
| 代理商： | X1228V14Z-4.5A |
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X1228
REV 1.3 3/24/04
Characteristics subject to change without notice.
27 of 31
www.xicor.com
Referring to Figure 16, Vtrip applies to the “Internal
Vcc” node which powers the entire device. This means
that if Vcc is powered down and the battery voltage at
Vback is higher than the Vtrip voltage, then the entire
chip will be running from the battery. If Vback falls to
lower than Vtrip, then the chip shuts down and all out-
puts are disabled except for the oscillator and time-
keeping circuitry. The fact that the chip can be powered
from Vback is not necessarily an issue since standby
current for the RTC devices is <2μA for this mode
(called “main timekeeping current” in the data sheet).
Only when the serial interface is active is there an
increase in supply current, and with Vcc powered
down, the serial interface will most likely be inactive.
One way to prevent operation in battery backup mode
above the Vtrip level is to add a diode drop (silicon
diode preferred) to the battery to insure it is below
Vtrip. This will also provide reverse leakage protection
which may be needed to get safety agency approval.
One mode that should always be avoided is the opera-
tion of the RTC device with Vback greater than both
Vcc and Vtrip (Condition 2d in Table 8). This will cause
the battery to drain quickly as serial bus communica-
tion and non-volatile writes will require higher supplier
current.
PERFORMANCE DATA
I
BACK
Performance
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
I
BACK
vs. Temperature
Multi-Lot Process Variation Data
Temperature °C
-40
25
60
85
I
B
3.3V
1.8V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X1228V14IZ-4.5A | 16 Characters x 1 Lines, 5x7 Dot Matrix Character and Cursor |
| X1228V14Z-2.7A | EXT. DISTANCE DATA CABLE 25 CO |
| X1228S14Z-2.7T1 | EXT DIST RS232 DATA CBL DB25 MALE - DB25 FEMALE |
| X1228V14I-2.7A | RTC Module With CPU Supervisor |
| X1228V14I-4.5A | DIODE 05 TVS SO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X1228ZY WAF | 制造商:Intersil Corporation 功能描述: |
| X122K | 制造商:IQD Frequency Products 功能描述:CRYSTAL OSCILLATOR 12.288000MHZ |
| X122-SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| X123-133.33M | 制造商:CONNOR-WINFIELD 制造商全稱:Connor-Winfield Corporation 功能描述:5.0x7.0mm Surface Mount LVCMOS Clock Oscillator Series |
| X123241-RDS | 制造商:Honeywell Sensing and Control 功能描述:ATOM & PROX |
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