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參數(shù)資料
| 型號： | IDTQS3L388Q |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | 5-BIT EXCHANGER, TRUE OUTPUT, PDSO24 |
| 封裝： | QSOP-24 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大小： | 111K |
| 代理商： | IDTQS3L388Q |
5
IDTQS3L388
HIGH-SPEEDCMOSBUSEXCHANGESWITCH
INDUSTRIALTEMPERATURERANGE
IBH
+ 500
Sinking
Current
( + )
IBHL
IBH
IBHH
+60
+20
– 60
– 20
+60 IBHL
0.8V
2V
VIH
– 60 IBHH
V IL
Sourcing
Current
( – )
IBH
– 500
Vcc
+ 20 IBH
– 20 IBH
Voltage
VT
V-I CHARACTERISTICS OF BUS-HOLD CIRCUIT
VT
≡≡≡≡≡ Threshold Voltage ≈ 1.5V
VIL
≈ .8
VIH
≈ 2V
ACTIVE TERMINATOR OR BUS-HOLD CIRCUIT
The Active Terminator 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” from the 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 from floating, 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 termination to VCC 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 from 0 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 VCC, the input ‘source’ current
begins to decrease, reaching the lowest level at VIN = VCC.
相關PDF資料 |
PDF描述 |
|---|---|
| IDTQS3LR384Q8 | DUAL 5-BIT DRIVER, TRUE OUTPUT, PDSO24 |
| IDTQS3R245SO8 | 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| IDTQS3R245SO | 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| IDTQS3R245Q8 | 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| IDTQS3R384QG | DUAL 5-BIT DRIVER, TRUE OUTPUT, PDSO24 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| IDTQS3LR384Q | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS SWITCH|CMOS|SSOP|24PIN|PLASTIC |
| IDTQS3LR384SO | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS SWITCH|CMOS|SOP|24PIN|PLASTIC |
| IDTQS3R245 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:HIGH-SPEED CMOS QUICKSWITCH 8-BIT LOW RESISTANCE BUS SWITCH |
| IDTQS3R245Q | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS SWITCH|CMOS|SSOP|20PIN|PLASTIC |
| IDTQS3R245SO | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:BUS SWITCH|CMOS|SOP|20PIN|PLASTIC |
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