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| 型号： | SN74LV221ADBRG4 |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| 中文描述： | 双单稳多谐振荡器与施密特触发输入 |
| 文件页数： | 10/22页 |
| 文件大小： | 573K |
| 代理商： | SN74LV221ADBRG4 |
SCLS450G DECEMBER 1999 REVISED APRIL 2005
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
caution in use
To prevent malfunctions due to noise, connect a high-frequency capacitor between V
CC
and GND, and keep
the wiring between the external components and C
ext
and R
ext
/C
ext
terminals as short as possible.
power-down considerations
Large values of C
ext
can cause problems when powering down the ’LV221A because of the amount of energy
stored in the capacitor. When a system containing this device is powered down, the capacitor can discharge
from V
CC
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 V
CC
power supply must not be faster than
t = V
CC
×
C
ext
/30 mA. For example, if V
CC
= 5 V and C
ext
= 15 pF, the V
CC
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 V
CC
to zero occurs, the ’LV221A can sustain
damage. To avoid this possibility, use external clamping diodes.
output pulse duration
The output pulse duration, t
w
, is determined primarily by the values of the external capacitance (C
T
) and timing
resistance (R
T
). The timing components are connected as shown in Figure 2.
VCC
RT
CT
To Rext/Cext
Terminal
To Cext
Terminal
Figure 2. Timing-Component Connections
The pulse duration is given by:
t
w
K
R
T
C
T
if C
T
is
≥
1000 pF, K = 1.0
or
if C
T
is
<
1000 pF, K can be determined from Figure 7
where:
t
w
= pulse duration in ns
R
T
= external timing resistance in k
C
T
= external capacitance in pF
K
= multiplier factor
Equation 1 and Figure 3 or 4 can be used to determine values for pulse duration, external resistance, and
external capacitance.
(1)
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相关代理商/技术参数 |
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| SN74LV221ADE4 | 功能描述:单稳态多谐振荡器 Dual 单稳态多谐振荡器s 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 |
| SN74LV221ADG4 | 功能描述:单稳态多谐振荡器 DUAL MONOSTABLE 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 |
| SN74LV221ADGVR | 功能描述:单稳态多谐振荡器 Dual 单稳态多谐振荡器s 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 |
| SN74LV221ADGVRE4 | 功能描述:单稳态多谐振荡器 Dual 单稳态多谐振荡器s 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 |
| SN74LV221ADGVRG4 | 功能描述:单稳态多谐振荡器 DUAL MONOSTABLE 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 |
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