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| 型號： | KS8721SL |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 8/33頁 |
| 文件大小： | 0K |
| 描述： | TXRX 10/100 3.3V 48-SSOP |
| 標準包裝： | 30 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | IEEE 802 |
| 電源電壓： | 2.375 V ~ 2.625 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-BSSOP（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 48-SSOP |
| 包裝： | 管件 |
| 配用： | 576-1010-ND - BOARD EVAL EXPERIMENT KS8721SL |
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KS8721BL/SL
Micrel
M9999-051704
16
May 2004
Power Management
The KS8721BL/SL offers the following modes for power management:
Power-Down Mode: This mode can be achieved by writing to Register 0.11 or pulling pin 30 PD# low.
Power-Saving Mode: This mode can be disabled by writing to Register 1fh.10. The KS8721BL/SL turns off
KS8721BL/SL shuts down most of the internal circuits to save power if there is no link. Power-saving mode is in the
most effective state when auto-negotiation mode is enabled.
100BT FX Mode
Please contact your local field application engineer (FAE) for a reference schematic on fiber connection.
100BT FX mode is activated when FXSD/FXEN is higher than 0.6V (this pin has a default pull down). Under this mode, the
auto-negotiation and auto-MDI-X features are disabled.
In fiber operation, the FXSD pin should connect to the signal detect (SD) output of the fiber module. The internal threshold of
FXSD is around 1/2 V
DD ±50mV (1.25V ±0.05V). Above this level, the fiber signal is considered detected. The operation is
summarized in the following table:
FXSD/FXEN
Condition
Less than 0.6V
100TX mode
Less than 1.25V,
FX mode
but greater than 0.6V
No signal detected
FEF generated
Greater than 1.25
FX mode
Signal detected
Table 1. 100BT FX Mode
To ensure proper operation, the swing of fiber module SD should cover the threshold variation. A resistive voltage divider is
recommended to adjust the SD voltage range.
Far End Fault (FEF), repetition of a special pattern which consists of 84-one and 1-zero, is generated under “FX mode with
no signal detected.” The purpose of FEF is to notify the sender of a faulty link. When receiving an FEF, the LINK will go down
to indicate a fault, even with fiber signal detected. The transmitter is not affected by receiving an FEF and still sends out its
normal transmit pattern from MAC. FEF can be disabled by strapping pin 27 low. Refer to the “Strapping Options” section.
Media Converter Operation
The KS8721BL/SL is capable of performing media conversion with two parts in a back-to-back RMII loop-back mode as
indicated in the diagram. Both parts are in RMII mode and with RMII BTB asserted (pins 21 and 22 strapped high). One part
is operating in TX mode and the other is operating in FX mode. Both parts can share a common 50MHz oscillator.
Under this operation, auto-negotiation on the TX side prohibits 10BASE-T link-up. Additional options can be implemented
under this operation. Disable the transmitter and set it at tri-state by controlling the high TXD2 pin. In order to do this, RXD2
and TXD2 pins need to be connected via inverter. When TXD2 pin is high in both the copper and fiber operation, it is disabled
transmit. Meanwhile, the RXD2 pin on the copper side serves as the energy detect and can indicate if a line signal is detected.
TXD3 should be tied low and RXD3 let float. Please contact your Micrel FAE for a media converter reference design.
Figure 3. Fiber Module
Rx +/-
Tx +/-
FTx
FRx
Pin
34
TxD
(Fiber Mode)
21 22
Pin
21 22
50MHz
VCC
OSC
TxC/
Ref_CLK
TxC/
Ref_CLK
RxD
VCC
KS8721BL/SL
KS8721BL/SL
To the SD pin of the
Fiber Module
TxD
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| KS8721SL TR | 功能描述:IC TXRX PHY 10/100 3.3V 48SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SLA4 | 功能描述:TXRX 10/100 3.3V 48-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SLA4 TR | 功能描述:TXRX 10/100 3.3V 48-SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
| KS8721SL-EVAL | 功能描述:BOARD EVAL EXPERIMENT KS8721SL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:- 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板 |
| KS8721SLI | 功能描述:IC TXRX PHY 10/100 3.3V 48SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,140 系列:AU 類型:收發(fā)器 驅(qū)動器/接收器數(shù):1/1 規(guī)程:CAN 電源電壓:5.3 V ~ 27 V 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SO 包裝:管件 其它名稱:935267940512AU5790D14AU5790D14-ND |
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