參數資料
型號： STHS4257L
廠商： 意法半導體
英文描述： IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識別電阻的IEEE802.3af PoE PD 接口控制器)
中文描述： IEEE 802.3af標準的PoE供電設備（PD）接口控制器，它集成簽名電阻（集成識別電阻的IEEE802.3af標準PoE電源接口控制器）
文件頁數： 1/18頁
文件大?。?/td> 173K
代理商： STHS4257L
July 2007
Rev 4
1/18
1
STHS4257A, STHS4257A1
STHS4257L, STHS4257L1
IEEE 802.3af PoE Powered Device (PD)
interface controller with integrated signature resistor
Features
■
IEEE 802.3af-compliant interface for Powered
Devices (PDs)
■
Integrated 100V, 450mA power MOSFET low
side switch
■
Inrush current limit
■
Normal operation current limit
■
Integrated 25k
Ω
signature resistor
■
Signature disable (STHS4257A1/L1)
■
Resistor-programmable classification current
(Class 0-4)
■
Power Good output, open drain
■
Undervoltage Lockout (UVLO)
■
Thermal overload protection (two-step for the
STHS4257A/L)
■
Latch (L) or auto-retry (A) after repetitive
thermal overload
■
Industrial temperature range: –40 to +85°C
■
SO8 and DFN8 (3mm x 3mm) packages
■
RoHS compliant
Applications
■
Voice over IP (VoIP) phones
■
Web cameras
■
WLAN access points
■
Internet appliances
■
POS terminals
■
RFID readers
DFN8 3mm x 3mm (DB)
SO8 (M)
8
1
Table 1.
Device options
Order code
Signature
disable
UVLO
threshold,
rising (V)
UVLO
threshold,
falling (V)
Protection
mode
Thermal
overload
protection
Inrush
current limit
(mA, typ)
Normal
operation
current limit
(mA, typ)
STHS4257A
39.2
30.5
Auto
2 steps
350/188
(1)
STHS4257A1
36.0
30.5
Auto
1 step
140
375
STHS4257L
39.2
30.5
Latch
2 steps
350/188
(1)
STHS4257L1
36.0
30.5
Latch
1 step
140
375
1.
Current limit is common for both modes and gets reduced only in case of thermal overload. See
Table 5: Electrical parameters
.
相關PDF資料
PDF描述
STi4600 6 Channel Dolby AC-3 MPEG1/2 Audio Decoder(六通道音頻解碼器)
STI4600 6 CHANNEL DOLBY AC-3 MPEG1/2 AUDIO DECODER
STK12N06L N - Channel Enhancement Mode Low Threshold Power MOS Transistor(N溝道增強模式低閾值功率MOS晶體管)
STK12N05L N - Channel Enhancement Mode Low Threshold Power MOS Transistor(N溝道增強模式低閾值功率MOS晶體管)
STK22N05 N-Channel Enhancement Mode Power MOS Transistor(N溝道增強模式功率MOSFET)
相關代理商/技術參數
參數描述
STHS4257L1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
STHT20138 制造商:Dewalt 功能描述:12" Solid Frame Hacksaw 制造商:DEWALT 功能描述:HIGH TENSION HACKSAW SOLID FRAME
STHT71850 制造商:Stanley 功能描述:Three Piece High Visibility Pliers Set
STHT77403 制造商:Black & Decker 功能描述:Stud Sensor 100&trade,
STHT77404 制造商:Black & Decker 功能描述:Stud Sensor 150&trade,
發(fā)布緊急采購，3分鐘左右您將得到回復。