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PCA9306DCUR 参数 Datasheet PDF下载

PCA9306DCUR图片预览
型号: PCA9306DCUR
PDF下载: 下载PDF文件 查看货源
内容描述: 双路双向I2C总线和SMBus电压电平转换 [DUAL BIDIRECTIONAL I2C BUS AND SMBus VOLTAGE-LEVEL TRANSLATOR]
分类和应用: 驱动程序和接口接口集成电路光电二极管PC
文件页数/大小: 16 页 / 421 K
品牌: TI [ TEXAS INSTRUMENTS ]
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SCPS113I – OCTOBER 2004 – REVISED JULY 2008
Sizing Pullup Resistor
The pullup resistor value needs to limit the current through the pass transistor, when it is in the on state, to about
15 mA. This ensures a pass voltage of 260 mV to 350 mV. If the current through the pass transistor is higher
than 15 mA, the pass voltage also is higher in the on state. To set the current through each pass transistor at 15
mA, the pullup resistor value is calculated as:
R
PU
+
V
DPU
*
0.35 V
0.015 A
The following table summarizes resistor values, reference voltages, and currents at 15 mA, 10 mA, and 3 mA.
The resistor value shown in the +10% column (or a larger value) should be used to ensure that the pass voltage
of the transistor is 350 mV or less. The external driver must be able to sink the total current from the resistors on
both sides of the PCA9306 device at 0.175 V, although the 15 mA applies only to current flowing through the
PCA9306 device.
PULLUP RESISTOR VALUES
(1) (2)
PULLUP RESISTOR VALUE (Ω)
V
DPU
5V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
(1)
(2)
(3)
15 mA
NOMINAL
310
197
143
97
77
57
+10%
341
217
158
106
85
63
(3)
10 mA
NOMINAL
465
295
215
145
115
85
+10%
512
325
237
160
127
94
(3)
3 mA
NOMINAL
1550
983
717
483
383
283
+10%
(3)
1705
1082
788
532
422
312
Calculated for V
OL
= 0.35 V
Assumes output driver V
OL
= 0.175 V at stated current
+10% to compensate for V
DD
range and resistor tolerance
Copyright © 2004–2008, Texas Instruments Incorporated
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