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參數(shù)資料
| 型號(hào)： | PCA9513A |
| 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)： | 8/25頁 |
| 文件大?。?/td> | 142K |
| 代理商： | PCA9513A |
PCA9513A_PCA9514A_1
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Product data sheet
Rev. 01 — 11 October 2005
8 of 25
Philips Semiconductors
PCA9513A; PCA9514A
Hot swappable I
2
C-bus and SMBus bus buffer
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
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 0.8 V for the PCA9513A and PCA9514A
are 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 SDAn and SCLn pins, in order to activate the boost pull-up currents
during rising edges. Choose maximum resistor value using the formula:
where R
PU
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.
In addition, regardless of the bus capacitance, always choose R
PU
≤
16 k
for
V
CC
= 5.5 V maximum, R
PU
≤
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 6
and
Figure 7
for guidance in resistor pull-up selection.
R
PU
800
10
3
×
V
-----------------------------------
0.6
–
C
≤
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PDF描述 |
|---|---|
| PCA9514A | Hot swappable I2C-bus and SMBus bus buffer |
| PCA9516A | 5-channel I2C hub |
| PCA9519 | 4-channel level translating I2C-bus/SMBus repeater |
| PCA9540B | 2-channel I2C multiplexer |
| PCA9540PWDH | 2-channel I2C multiplexer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9513AD | 功能描述:緩沖器和線路驅(qū)動(dòng)器 HOT SWAP I2C/SMBUS BUS 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 |
| PCA9513AD,112 | 功能描述:緩沖器和線路驅(qū)動(dòng)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 |
| PCA9513AD,118 | 功能描述:緩沖器和線路驅(qū)動(dòng)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 |
| PCA9513AD112 | 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: |
| PCA9513ADP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hot swappable I2C-bus and SMBus bus buffer |
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