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参数资料
| 型号： | FXMA2104UMX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/15页 |
| 文件大小： | 0K |
| 描述： | TRANSLATOR 4BIT DUAL 12-UMLP |
| 标准包装： | 5,000 |
| 逻辑功能： | 变换器，双向，3 态，开路漏极 |
| 位数： | 4 |
| 输入类型： | 电压 |
| 输出类型： | 电压 |
| 数据速率： | * |
| 通道数： | 4 |
| 输出/通道数目： | 1 |
| 差分 - 输入:输出： | 无/无 |
| 传输延迟（最大）： | 4ns |
| 电源电压： | 1.65 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FXMA2104 Rev. 1.0.1
7
FXMA2104
—
Dual-S
upply,
4-Bit
Voltag
e
Translator
/
Buffer
/
Re
peater
/for
Open-Drain
Applications
Buffer / Repeater Performance
The FXMA2104 dynamic drivers have enough current-
sourcing capability to drive a 400pF capacitive bus. This
is beneficial when an I
2C buffer / repeater is required.
The I
2C specification stipulates a maximum bus
capacitance of 400pF. If an I
2C segment exceeds
400pF, an I
2C buffer / repeater is required to split the
segment into two segments, each of which is less than
400pF. Figure 4 is a scope shot of an FXMA2104
driving a lumped load of 600pF. Notice the (30% - 70%)
rise time is only 112ns (total RPU = 2.2K). This is well
below the maximum edge rate of 300ns. Not only does
the FXMA2104 drive 400Pf; it also provides excellent
headroom below the I
2C specification maximum edge
rate of 300ns.
VOL vs. IOL
The I
2C specification mandates a maximum VIL (IOL of
3mA) of VCC 0.3 and a maximum VOL of 0.4V. If there
is a master on the A port of an I
2C translator with a VCC
of 1.65V and a slave on the I
2C translator B port with a
VCC of 3.3V, the maximum VIL of the master is (1.65V x
0.3) 495mV. The slave could legally transmit a valid
logic LOW of 0.4V to the master.
If the I
2C translator’s channel resistance is too high, the
voltage drop across the translator could present a VIL to
the master greater than 495mV. To complicate matters,
the I
2C specification states that 6mA of IOL is
recommended
for
bus
capacitances
approaching
400pF. More IOL increases the voltage drop across the
I
2C translator. The I2C application benefits when I2C
translators exhibit low VOL performance. Figure 5
depicts typical FXMA2104 VOL performance vs. a
competitor, given a 0.4V VIL.
Figure 5. VOL vs. IOL
0.4
0.45
0.5
0.55
0.6
0.65
02
46
8
10
V
OL
(V):
IOL (mA):
VOL: FXMA2104 vs. Device B, VIL = 0.4V
Device B
VIL = 0.4V
FXMA2104
VIL = 0.4V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FXMAR1202UMX | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FXMAR2102 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Supply, 2-Bit Voltage Translator / Isolator for I2C Applications |
| FXMAR2102L8X | 功能描述:转换 - 电压电平 2xSupply 2-Bit Volt Translator/Isolator RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
| FXMAR2102UMX | 功能描述:转换 - 电压电平 2xSupply 2-Bit Volt Translator/Isolator RoHS:否 制造商:Micrel 类型:CML/LVDS/LVPECL to LVCMOS/LVTTL 传播延迟时间:1.9 ns 电源电流:14 mA 电源电压-最大:3.6 V 电源电压-最小:3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MLF-8 |
| FXMAR2104 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Dual-Supply, 4-Bit Voltage Translator / Isolator for Open-Drain |
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