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參數(shù)資料
| 型號(hào)： | IDTQS3389 |
| 廠商： | Integrated Device Technology, Inc. |
| 英文描述： | QUICKSWITCH PRODUCTS LAST VALUE LATCH 20 ACTIVE BUS TERMINATORS |
| 中文描述： | QUICKSWITCH產(chǎn)品最后一個(gè)值鎖存20的總線終端器 |
| 文件頁(yè)數(shù)： | 4/5頁(yè) |
| 文件大?。?/td> | 44K |
| 代理商： | IDTQS3389 |
4
COMMERCIAL TEMPERATURE RANGE
IDTQS3389
LAST VALUE LATCH 20 ACTIVE TERMINATORS (BUS HOLD)
V-I CHARACTERISTICS OF BUS-HOLD CIRCUIT
ACTIV E TERMINATOR OR ‘BUS-HOLD’ CIRCUIT
The Active Termnator circuit, also known as the Bus-hold circuit, is configured as a “weak latch” with positive feedback. When connected to a TTL
or CMOS input port, the Bus-hold circuit holds the last logic state at the input when the input is “disconnected” fromthe driver. When the output of a device
connected to such an input attempts a logic level transition, it will over-drive the Bus-hold circuit. The primary benefit of this circuit is that it prevents CMOS
inputs fromfloating, a situation which should be avoided to prevent spurious switching of inputs and unnecessary power dissipation. Bus-hold is a better
solution than the traditional approach of using resistive termnation to V
CC
or GND to prevent bus floating, because the Bus-hold circuit does not consume
any static power.
The figure above shows the input V-I characteristics of a Bus-hold implementation. The input characteristics resemble a resistor. As the input voltage
is increased from0 volts, the sink’ current increases linearly. When the TTL threshold of the circuit is reached (typically 1.5 volts), the latch changes the
logic state due to positive feedback and the direction of current is reversed. As the voltage is further increased towards V
CC
, the input source’ current
begins to decrease, reaching the lowest level at V
IN =
V
CC.
I
BH
+500
Sinking
Current
( + )
I
BHL
I
BH
I
BHH
+60
+20
– 60
– 20
+60
I
BHL
0.8V
2V
V
IH
– 60 I
BHH
V
IL
Sourcing
Current
( – )
I
BH
– 500
Vcc
+20 I
BH
– 20 I
BH
Voltage
V
T
V
T
≡
Threshold Voltage
≈
1.5V
V
IL
≈
.8 V
IH
≈
2V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IDTQS3389Q | QUICKSWITCH PRODUCTS LAST VALUE LATCH 20 ACTIVE BUS TERMINATORS |
| IDTQS3390 | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 16:8 MULTIPLEXER |
| IDT3390Q | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 16:8 MULTIPLEXER |
| IDT3390SO | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 16:8 MULTIPLEXER |
| IDT3390QG | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 16:8 MULTIPLEXER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IDTQS3389Q | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUICKSWITCH PRODUCTS LAST VALUE LATCH 20 ACTIVE BUS TERMINATORS |
| IDTQS3390 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUICKSWITCH PRODUCTS HIGH-SPEED CMOS QUICKSWITCH 16:8 MULTIPLEXER |
| IDTQS3390Q | 制造商:INT_DEV_TECH 功能描述: |
| IDTQS3390QG | 功能描述:IC MUX 16:8 QUICKSWITCH 28-QSOP RoHS:是 類別:集成電路 (IC) >> 邏輯 - 信號(hào)開(kāi)關(guān)，多路復(fù)用器，解碼器 系列:3000 標(biāo)準(zhǔn)包裝:48 系列:74VHC 類型:多路復(fù)用器 電路:4 x 2:1 獨(dú)立電路:1 輸出電流高，低:8mA，8mA 電壓電源:單電源 電源電壓:2 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:管件 |
| IDTQS3390QG8 | 功能描述:MUX 16:8 SH QUICKSWITCH 28-QSOP RoHS:是 類別:集成電路 (IC) >> 邏輯 - 信號(hào)開(kāi)關(guān)，多路復(fù)用器，解碼器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:74CBT 類型:總線 FET 交換開(kāi)關(guān) 電路:9 x 2:2 獨(dú)立電路:1 輸出電流高，低:15mA，64mA 電壓電源:單電源 電源電壓:4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:48-TVSOP 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:955 (CN2011-ZH PDF) 其它名稱:296-6385-6 |
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