- 您现在的位置：买卖IC网 > PDF目录98120 > SN74LV221AQPWRG4Q1 (TEXAS INSTRUMENTS INC) LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 PDF资料下载
参数资料
| 型号： | SN74LV221AQPWRG4Q1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 谐振器 |
| 英文描述： | LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封装： | GREEN, PLASTIC, TSSOP-16 |
| 文件页数： | 13/14页 |
| 文件大小： | 192K |
| 代理商： | SN74LV221AQPWRG4Q1 |
VCC
RT
CT
To Rext/Cext
Terminal
To Cext
Terminal
SCLS692A
– OCTOBER 2005 – REVISED APRIL 2008
APPLICATION INFORMATION
Caution in Use
To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the
wiring between the external components and Cext and Rext/Cext terminals as short as possible.
Power-Down Considerations
Large values of Cext can cause problems when powering down the SN74LV221A-Q1 because of the amount of
energy stored in the capacitor. When a system containing this device is powered down, the capacitor can
discharge from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes
must be limited to 30 mA; therefore, the turn-off time of the VCC power supply must not be faster than
t = VCC × Cext/30 mA. For example, if VCC = 5 V and Cext = 15 pF, the VCC supply must turn off no faster than
t = (5 V)
× (15 pF)/30 mA = 2.5 ns. Usually, this is not a problem because power supplies are heavily filtered and
cannot discharge at this rate. When a more rapid decrease of VCC to zero occurs, the SN74LV221A-Q1 can
sustain damage. To avoid this possibility, use external clamping diodes.
Output Pulse Duration
The output pulse duration, tw, is determined primarily by the values of the external capacitance (CT) and timing
Figure 2. Timing-Component Connections
The pulse duration is given by:
tw = K × RT × CT
if CT is ≥ 1000 pF, K = 1.0
or
where:
tw = pulse duration in ns
RT = external timing resistance in k
CT = external capacitancein pF
K = multiplier factor
(1)
Equation 1 and Figure 3 or Figure 4 can be used to determine values for pulse duration, external resistance, and
external capacitance.
8
Copyright
2005–2008, Texas Instruments Incorporated
相关PDF资料 |
PDF描述 |
|---|---|
| SN74LV240ADGVRG4 | LV/LV-A/LVX/H SERIES, DUAL 4-BIT DRIVER, INVERTED OUTPUT, PDSO20 |
| SN74LV244AD | LV/LV-A/LVX/H SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| SN74LV244APWT | LV/LV-A/LVX/H SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| SN74LV244ADGVR | LV/LV-A/LVX/H SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| SN74LV244ADW | LV/LV-A/LVX/H SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74LV221AQPWRQ1 | 功能描述:单稳态多谐振荡器 Auto Cat Dual Mono Multivibrators RoHS:否 制造商:Texas Instruments 每芯片元件:1 逻辑系列:LVC 逻辑类型:Monostable Multivibrator 封装 / 箱体:SSOP-8 传播延迟时间:18.6 ns 高电平输出电流:- 32 mA 低电平输出电流:32 mA 电源电压-最大:5.5 V 电源电压-最小:1.65 V 最大功率耗散: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Reel |
| SN74LV240ADBR | 功能描述:缓冲器和线路驱动器 Tri-State Octal RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| SN74LV240ADBRE4 | 功能描述:缓冲器和线路驱动器 Octal Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| SN74LV240ADBRG4 | 功能描述:缓冲器和线路驱动器 Octal Buffers Driver RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
| SN74LV240ADGVR | 功能描述:缓冲器和线路驱动器 Tri-State Octal RoHS:否 制造商:Micrel 输入线路数量:1 输出线路数量:2 极性:Non-Inverting 电源电压-最大:+/- 5.5 V 电源电压-最小:+/- 2.37 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。