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參數(shù)資料
| 型號(hào)： | SN74LV221AQPWRG4Q1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 諧振器 |
| 英文描述： | LV/LV-A/LVX/H SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDSO16 |
| 封裝： | GREEN, PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 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
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| SN74LV221AQPWRQ1 | 功能描述:單穩(wěn)態(tài)多諧振蕩器 Auto Cat Dual Mono Multivibrators RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時(shí)間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| SN74LV240ADBR | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Tri-State Octal RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74LV240ADBRE4 | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Octal Buffer/Driver With 3-State Outputs RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74LV240ADBRG4 | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Octal Buffers Driver RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| SN74LV240ADGVR | 功能描述:緩沖器和線路驅(qū)動(dòng)器 Tri-State Octal RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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