FN8239.1 January 21, 2005 ISL88694 Operation To improve the operation of the SMBus where larger bus capacitance exists, the ISL88694 prov" />
參數(shù)資料
型號(hào): ISL88694IH5Z-TK
廠商: Intersil
文件頁數(shù): 6/7頁
文件大?。?/td> 0K
描述: IC ACCELERATOR SMBUS SOT23-5
產(chǎn)品培訓(xùn)模塊: Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝: 1
類型: SMBus 加速器
Tx/Rx類型: I²C Logic
延遲時(shí)間: 0 ~ 15 分
電源電壓: 2.7 V ~ 5.5 V
電流 - 電源: 80µA
安裝類型: 表面貼裝
封裝/外殼: SC-74A,SOT-753
供應(yīng)商設(shè)備封裝: SOT-5
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 1242 (CN2011-ZH PDF)
其它名稱: ISL88694IH5ZDKR
6
FN8239.1
January 21, 2005
ISL88694 Operation
To improve the operation of the SMBus where larger bus
capacitance exists, the ISL88694 provides active pull-up
using switched current sources. When the bus is idle and
both lines are HIGH, a standby pull-up current of 100A is
used to maintain the signal level while minimizing power
consumption. When either of the two signals is pulled LOW,
an active pull-up current of 275A maintains a good VOL
noise margin.
When the bus line is released, it is pulled high by the
ISL88694 active current until the voltage exceeds the
VTRIPL level for a period of time. This voltage-time
combination filters out noise on the signal line. Once the
ISL88694 detects a valid rising edge, a 2.2mA boost current
pulls the bus line high very quickly (see Figure 8). This boost
current turns off when the input level reaches the VTRIPH
threshold and the pull-up current returns to the active level. If
both inputs are HIGH, the pull-up current drops to the
standby level of 100A.
FIGURE 8. ISL88694 SMBus SYSTEM BOOST PULL-UP
COMPARED TO RESISTOR PULL-UP (VDD =
5.5V).
FIGURE 9. ISL88694 SMBus SYSTEM BOOST PULL-UP
COMPARED TO RESISTOR PULL-UP (VDD =
2.7V).
FIGURE 10. NOISE SUPPRESSION. BOOST CURRENT
APPLIED WHEN INPUT SIGNAL EXCEEDS 20Vns
(TYPICAL).
VTRIPL
With RC
Pullup
With ISL88694 SMA
VTRIPH
R=15.8K
C= 200pF
VTRIPL
With RC
Pullup
With ISL88694 SMA
VTRIPH
R=15.8K
C= 200pF
VTRIPL
Gnd
t
SMBus1
>20Vns
SMBus2
VDD
With SMA
Without SMA
(Typical)
VTRIPH
ISL88694
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