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參數(shù)資料
| 型號： | SN54AHC123AFK |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS |
| 中文描述： | 雙RETRIGGERABLE單穩(wěn)態(tài)多頻振蕩器 |
| 文件頁數(shù)： | 9/23頁 |
| 文件大?。?/td> | 598K |
| 代理商： | SN54AHC123AFK |
SN54AHC123A, SN74AHC123A
DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS
SCLS352G
–
JULY 1997
–
REVISED APRIL 2003
9
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
’
AHC123A devices 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
’
AHC123A devices
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 5
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 can be used to determine values for pulse duration, external resistance, and external
capacitance.
(1)
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