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参数资料
| 型号： | IDTQS3389Q |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 通用总线功能 |
| 英文描述： | QUICKSWITCH PRODUCTS LAST VALUE LATCH 20 ACTIVE BUS TERMINATORS |
| 中文描述： | 20-LINE 7000 ohm DIODE BUS TERMINATION ARRAY, PDSO24 |
| 封装： | QSOP-24 |
| 文件页数： | 4/5页 |
| 文件大小： | 44K |
| 代理商： | IDTQS3389Q |
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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IDTQS3390 | 制造商:IDT 制造商全称: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 类别:集成电路 (IC) >> 逻辑 - 信号开关，多路复用器，解码器 系列:3000 标准包装:48 系列:74VHC 类型:多路复用器 电路:4 x 2:1 独立电路:1 输出电流高，低:8mA，8mA 电压电源:单电源 电源电压:2 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:管件 |
| IDTQS3390QG8 | 功能描述:MUX 16:8 SH QUICKSWITCH 28-QSOP RoHS:是 类别:集成电路 (IC) >> 逻辑 - 信号开关，多路复用器，解码器 系列:- 标准包装:1 系列:74CBT 类型:总线 FET 交换开关 电路:9 x 2:2 独立电路:1 输出电流高，低:15mA，64mA 电压电源:单电源 电源电压:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:48-TVSOP 包装:Digi-Reel® 产品目录页面:955 (CN2011-ZH PDF) 其它名称:296-6385-6 |
| IDTQS3390SOG | 功能描述:MUX 16:8 SH QUICKSWITCH 28-SOIC RoHS:是 类别:集成电路 (IC) >> 逻辑 - 信号开关，多路复用器，解码器 系列:- 标准包装:25 系列:74HC 类型:解码器 电路:1 x 2:4 独立电路:2 输出电流高，低:5.2mA，5.2mA 电压电源:单电源 电源电压:2 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 供应商设备封装:16-DIP 包装:管件 |
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