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參數(shù)資料
| 型號： | PCA9511A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Hot swappable I2C-bus and SMBus bus buffer |
| 中文描述： | 熱插拔I2C總線和SMBus總線緩沖器 |
| 文件頁數(shù)： | 6/23頁 |
| 文件大?。?/td> | 144K |
| 代理商： | PCA9511A |
9397 750 13269
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 15 August 2005
6 of 23
Philips Semiconductors
PCA9511A
Hot swappable I
2
C-bus and SMBus bus buffer
on the accelerator turns the pull-down off. If the V
IL
is above
～
0.6 V and a rising edge is
detected, the pull-down will turn off and will not turn back on until a falling edge is
detected.
Consider a system with three buffers connected to a common node and communication
between the Master and Slave B that are connected at either end of buffer A and buffer B
in series as shown in
Figure 4
. Consider if the V
OL
at the input of buffer A is 0.3 V and the
V
OL
of Slave B (when acknowledging) is 0.4 V with the direction changing from Master to
Slave B and then from Slave B to Master. Before the direction change you would observe
V
IL
at the input of buffer A of 0.3 V and its output, the common node, is
～
0.4 V. The output
of buffer B and buffer C would be
～
0.5 V, but Slave B is driving 0.4 V, so the voltage at
Slave B is 0.4 V. The output of buffer C is
～
0.5 V. When the Master pull-down turns off, the
input of buffer A rises and so does its output, the common node, because it is the only part
driving the node. The common node will rise to 0.5 V before buffer B's output turns on, if
the pull-up is strong the node may bounce. If the bounce goes above the threshold for the
rising edge accelerator
～
0.6 V the accelerators on both buffer A and buffer C will fire
contending with the output of buffer B. The node on the input of buffer A will go HIGH as
will the input node of buffer C. After the common node voltage is stable for a while the
rising edge accelerators will turn off and the common node will return to
～
0.5 V because
the buffer B is still on. The voltage at both the Master and Slave C nodes would then fall to
～
0.6 V until Slave B turned off. This would not cause a failure on the data line as long as
the return to 0.5 V on the common node (
～
0.6 V at the Master and Slave C) occurred
before the data setup time. If this were the SCL line, the parts on buffer A and buffer C
would see a false clock rather than a stretched clock, which would cause a system error.
8.4 Propagation delays
The delay for a rising edge is determined by the combined pull-up current from the bus
resistors and the rise time accelerator current source and the effective capacitance on the
lines. If the pull-up currents are the same, any difference in rise time is directly
proportional to the difference in capacitance between the two sides. The t
PLH
may be
negative if the output capacitance is less than the input capacitance and would be positive
if the output capacitance is larger than the input capacitance, when the currents are the
same.
The t
PHL
can never be negative because the output does not start to fall until the input is
below 0.7V
CC
, and the output turn on has a non-zero delay, and the output has a limited
maximum slew rate, and even if the input slew rate is slow enough that the output catches
up it will still lag the falling voltage of the input by the offset voltage. The maximum t
PHL
occurs when the input is driven LOW with zero delay and the output is still limited by its
Fig 4.
System with 3 buffers connected to common node
002aab581
buffer C
buffer B
buffer A
common
node
SLAVE B
SLAVE C
MASTER
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9511AD | 制造商: 功能描述: 制造商:NXPSEM 功能描述: |
| PCA9511AD,112 | 功能描述:緩沖器和線路驅動器 HOTSWAP I2C/SMBUS BUFFER RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| PCA9511AD,118 | 功能描述:緩沖器和線路驅動器 HOT SWAP I2C/SMBUS RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| PCA9511AD112 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9511AD-112 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hot swappable I2C-bus and SMBus bus buffer Rev. 04 a?? 19 August 2009 |
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