- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄365656 > SNJ54LV221AJ (Texas Instruments, Inc.) Small Signal NPN; Package: SOT-23 (TO-236) 3 LEAD; No of Pins: 3; Container: Tape and Reel; Qty per Container: 3000 PDF資料下載
參數(shù)資料
| 型號(hào)： | SNJ54LV221AJ |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | Small Signal NPN; Package: SOT-23 (TO-236) 3 LEAD; No of Pins: 3; Container: Tape and Reel; Qty per Container: 3000 |
| 中文描述： | 施密特觸發(fā)輸入與雙單穩(wěn)態(tài)多頻振蕩器 |
| 文件頁數(shù)： | 10/19頁 |
| 文件大?。?/td> | 436K |
| 代理商： | SNJ54LV221AJ |
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)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SNJ54LV221AW | Small Signal NPN; Package: SOT-23 (TO-236) 3 LEAD; No of Pins: 3; Container: Tape and Reel; Qty per Container: 3000 |
| SN74LV221ADB | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| SN74LV221ADGV | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| SN74LV221ANS | DUAL MONOSTABLE MULTIVIBRATORS WITH SCHMITT-TRIGGER INPUTS |
| SN74LV273ADB | OCTAL D-TYPE FLIP-FLOPS WITH CLEAR |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SNJ54LVC00AFK | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:QUADRUPLE 2-INPUT POSITIVE-NAND GATE |
| SNJ54LVC00AJ | 制造商:Texas Instruments 功能描述:5962-9753301QCA, QUAD 2-IN POS-NAND GATE - Rail/Tube |
| SNJ54LVC00AW | 制造商:Texas Instruments 功能描述: |
| SNJ54LVC02AFK | 制造商:Texas Instruments 功能描述: |
| SNJ54LVC02AW | 制造商:Texas Instruments 功能描述:NOR Gate 4-Element 2-IN CMOS 14-Pin CFPAK Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。