- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄380765 > STLC5444 (意法半導(dǎo)體) Quad Feed Power Supply(ISDN四饋電電源) PDF資料下載
參數(shù)資料
| 型號： | STLC5444 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Quad Feed Power Supply(ISDN四饋電電源) |
| 中文描述： | 四飼料電源（綜合業(yè)務(wù)數(shù)字網(wǎng)四饋電電源） |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 140K |
| 代理商： | STLC5444 |
COUNTERFEEDING
It is possible that, in some applications,a commu-
nication channel that the STLC5444 feeds, is also
biased at the other end by another feeding de-
vice.
Figure 3:
Typical PABX connection.
What considerations apply to the STLC5444 in
this case
Let’susea genericexampleforreference(seeFig. 3)
STLC5444
Si
V
BB
U
S
STLC5444
V
BB
Si
PABX
NT
S
S
D95TL229
A PABX with S-interfaces may have some of
themconnectedto TerminalEquipments,and one
to the S-interface of a Nertwork Termination. The
S-interface of the PABX connected to the NT has
one channel of the STLC5444 available for feed-
ing. It will be programmed in the ”O(jiān)FF” state to
avoid interference with the feeding coming from
the NT (of course the feeding coming from the NT
will not be loaded by thisPABX connection).
The following considerations are relevant in the
above example:
1) The VBB of the STLC5444 in the PABX must
be equal or more negative than the feeding
voltage coming from the NT (unless decou-
pling diodes are externallyprovided - see 4)
2) The STLC5444 channel of the PABX must be
programmedOFF.
3) In the channel of the STLC5444 on the PABX
side, the only effect will be on the relevant
LVD bit that will be set to 1 if the feeding volt-
age coming from the NT is 3V more positive
than the local VBB. No interruptsor alarms are
generated.
4) It is good common practice to provide every S-
interface with protection circuitry against tran-
sient overvoltages(see Fig. 4). This includes a
diode in series with each Si pin of the
STLC5444. If this is the case, absolute levels
of local VBB and NT feeding are no concernat
all. (If such diodes are not present, care must
be paid to the power supply of the PABX, and
to the connected circuits. When the PABX
supply is OFF, the NT feeding will find a con-
nection through the relevant channel of the
STLC5444 to the VBB point).
TPAXX
D1
D2
D3
Si
BGND
BGND
STLC5444
FUSE RESISTORS
S INTERFACE
V
BB
BATTERY
D95TL230
Figure 4:
Protectionof the STLC5444against overvoltage.
STLC5444
13/17
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| STLC5460 | Line Card Interface Controller(線路卡片接口控制器) |
| STLC7546 | MODEM (V.34bis) Analog Front End(調(diào)制解調(diào)器模擬前端) |
| STLC7550TQFP | LOW POWER LOW VOLTAGE ANALOG FRONT END |
| STLC7550TQF7 | LOW POWER LOW VOLTAGE ANALOG FRONT END |
| STLC7550 | LOW POWER LOW VOLTAGE ANALOG FRONT END |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| STLC5444B1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD FEEDER POWER SUPPLY |
| STLC5444FN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD FEEDER POWER SUPPLY |
| STLC5445 | 功能描述:監(jiān)控電路 Asics RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| STLC5460 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LINE CARD INTERFACE CONTROLLER |
| STLC5460FN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。