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參數(shù)資料
| 型號(hào)： | ISL88694IH5-TK |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 5/7頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC SMBUS ACCELERATOR SOT23-5 |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類(lèi)型： | SMBus 加速器 |
| Tx/Rx類(lèi)型： | I²C Logic |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 電流 - 電源： | 80µA |
| 安裝類(lèi)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： | 帶卷 (TR) |
5
FN8239.1
January 21, 2005
Functional Description
SMBus Overview
The SMBus or I2C bus is a 2-wire multimaster bus, meaning
that more than one device connected to the bus is capable of
controlling it. Master devices communicate to other master
or slave devices using one clock and one data line. These
are both bidirectional.
In order to allow multimaster operation without bus
contention, it is necessary to allow each bus to be connected
to a positive supply voltage via a current-source or pull-up
resistor (see “System Diagram” on page 2). When the bus is
free, both lines are HIGH. The output stages of devices
connected to the bus must have an open-drain or open-
collector to perform the wired-AND function.
Simple pull-up resistors on the clock and data lines work well
unless there are long signal lines or many devices
connected to the bus. Then, the combined capacitance of
the bus increases the rise time on the signal to such an
extent that the communication becomes unreliable or fails to
meet the bus timing specifications. Smaller resistors can
sometimes compensate for the extra capacitance, but this
increases the current consumption when the signal lines are
pulled LOW.
FIGURE 5. VTRIPH VOLTAGE
FIGURE 6. IDD CURRENT. SMBus1=SMBus2=OPEN.
FIGURE 7. BOOST PULL-UP CURRENT vs. SMBus VOLTAGE
Typical Performance Curves (Continued)
0.50
0.55
0.60
0.65
0.70
0.45
0.40
0.35
0.30
-40
-20
0
204060
80
100
-60
TEMPERATURE (°C)
IN
P
U
T
THRESHOL
D
HIGH,
V
TR
IPH
(V
DD
-V)
VDD=5.5V
VDD=2.7V
75
80
85
90
95
70
65
60
55
-40
-20
0
204060
80
100
-60
TEMPERATURE (°C)
S
U
P
LY
C
URRENT
,
I DD
(A)
VDD=5.5V
VDD=2.7V
2.0
2.5
3.0
3.5
1.5
1.0
0.5
0
12
34
5
0
SMBus VOLTAGE (V)
BOOST
PULL-UP
CU
RRE
N
T,
I OU
T
_B
(mA)
6
VDD=5.0V
VDD=2.7V
ISL88694
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