- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377491 > IDTQS3388 (Integrated Device Technology, Inc.) QUICKSWITCH PRODUCTS HIGH-SPEED CMOS BUS EXCHANGE SWITCH WITH ACTIVE TERMINATION(BUS HOLD) PDF資料下載
參數(shù)資料
| 型號： | IDTQS3388 |
| 廠商： | Integrated Device Technology, Inc. |
| 英文描述： | QUICKSWITCH PRODUCTS HIGH-SPEED CMOS BUS EXCHANGE SWITCH WITH ACTIVE TERMINATION(BUS HOLD) |
| 中文描述： | QUICKSWITCH產(chǎn)品高活性終止與高速CMOS總線交換開關(guān)（總線日用品） |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 62K |
| 代理商： | IDTQS3388 |
5
IDTQS3388
HIGH-SPEED CMOS BUS EXCHANGE SWITCH WITH ACTIVE TERMINATION
INDUSTRIAL TEMPERATURE RANGE
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-I CHARACTERISTICS OF BUS-HOLD CIRCUIT
V
T
≡
Threshold Voltage
≈
1.5V
V
IL
≈
.8 V
IH
≈
2V
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IDTQS3389 | QUICKSWITCH PRODUCTS LAST VALUE LATCH 20 ACTIVE BUS TERMINATORS |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IDTQS3388Q | 制造商:Integrated Device Technology Inc 功能描述: |
| IDTQS3389 | 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 |
| 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: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。