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參數(shù)資料
| 型號(hào)： | FXMA2104UMX |
| 廠商： | Fairchild Semiconductor |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 0K |
| 描述： | TRANSLATOR 4BIT DUAL 12-UMLP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 邏輯功能： | 變換器，雙向，3 態(tài)，開路漏極 |
| 位數(shù)： | 4 |
| 輸入類型： | 電壓 |
| 輸出類型： | 電壓 |
| 數(shù)據(jù)速率： | * |
| 通道數(shù)： | 4 |
| 輸出/通道數(shù)目： | 1 |
| 差分 - 輸入:輸出： | 無/無 |
| 傳輸延遲（最大）： | 4ns |
| 電源電壓： | 1.65 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | * |
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| FXMAR1202UMX | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FXMAR2102 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Dual-Supply, 2-Bit Voltage Translator / Isolator for I2C Applications |
| FXMAR2102L8X | 功能描述:轉(zhuǎn)換 - 電壓電平 2xSupply 2-Bit Volt Translator/Isolator RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
| FXMAR2102UMX | 功能描述:轉(zhuǎn)換 - 電壓電平 2xSupply 2-Bit Volt Translator/Isolator RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時(shí)間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
| FXMAR2104 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Dual-Supply, 4-Bit Voltage Translator / Isolator for Open-Drain |
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