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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)： | 7/23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
7 of 23
Philips Semiconductors
PCA9511A
Hot swappable I
2
C-bus and SMBus bus buffer
turn-on delay and the falling edge slew rate. The output falling edge slew rate is a function
of the internal maximum slew rate which is a function of temperature, V
CC
and process, as
well as the load current and the load capacitance.
8.5 Rise time accelerators
During positive bus transitions a 2 mA current source is switched on to quickly slew the
SDA and SCL lines HIGH once the input level of 0.6 V for the PCA9511A is exceeded.
The rising edge rate should be at least 1.25 V/
μ
s to guarantee turn on of the accelerators.
8.6 READY digital output
This pin provides a digital flag which is LOW when either ENABLE is LOW or the start-up
sequence described earlier in this section has not been completed. READY goes HIGH
when ENABLE is HIGH and start-up is complete. The pin is driven by an open-drain
pull-down capable of sinking 3 mA while holding 0.4 V on the pin. Connect a resistor of
10 k
to V
CC
to provide the pull-up.
8.7 ENABLE low current disable
Grounding the ENABLE pin disconnects the backplane side from the card side, disables
the rise-time accelerators, drives READY LOW, disables the bus precharge circuitry, and
puts the part in a low current state. When the pin voltage is driven all the way to V
CC
, the
part waits for data transactions on both the backplane and card sides to be complete
before reconnecting the two sides.
8.8 Resistor pull-up value selection
The system pull-up resistors must be strong enough to provide a positive slew rate of
1.25 V/
μ
s on the SDA and SCL pins, in order to activate the boost pull-up currents during
rising edges. Choose maximum resistor value using the formula:
where R is the pull-up resistor value in
, V
CC(min)
is the minimum V
CC
voltage in volts,
and C is the equivalent bus capacitance in picofarads (pF).
In addition, regardless of the bus capacitance, always choose R
≤
16 k
for V
CC
= 5.5 V
maximum, R
≤
24 k
for V
CC
= 3.6 V maximum. The start-up circuitry requires logic HIGH
voltages on SDAOUT and SCLOUT to connect the backplane to the card, and these
pull-up values are needed to overcome the precharge voltage. See the curves in
Figure 5
and
Figure 6
for guidance in resistor pull-up selection.
R
800
10
3
×
V
-----------------------------------
0.6
–
C
≤
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相關(guān)代理商/技術(shù)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(qū)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(fēng)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(qū)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(fēng)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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