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參數(shù)資料
| 型號： | HEF4541BT |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 時鐘及定時 |
| 英文描述： | Programmable timer |
| 中文描述： | 可編程定時器 |
| 封裝： | HEF4541BP<SOT27-1 (DIP14)|<<http://www.nxp.com/packages/SOT27-1.html<1<Always Pb-free,;HEF4541BT<SOT108-1 (SO14)|<<http://www.nxp.com/packages/SOT108-1.html<1<Alway |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 142K |
| 代理商： | HEF4541BT |
January 1995
4
Philips Semiconductors
Product specification
Programmable timer
HEF4541B
MSI
PINNING
FREQUENCY SELECTION TABLE
A
0
, A
1
MODE
AR
MR
PH
R
TC
C
TC
RS
address inputs
mode select input
auto reset input
master reset input
phase input
external resistor connection (R
t
)
external capacitor connection (C
t
)
external resistor connection (R
S
) or
external clock input
A
0
A
1
NUMBER OF
COUNTER STAGES n
L
L
H
H
L
H
L
H
13
10
8
16
8 192
1 024
256
65 536
f
out
---------
2
n
=
FUNCTION TABLE
Notes
1.
For correct power-on reset, the supply voltage should
be above 8.5 V. For V
DD
< 8.5 V, disable the autoreset
and connect AR to V
DD
.
The timer is initialized on a reset pulse and the output
changes state after 2
n-1
counts and remains in that
state (latched). Reset of this latch is obtained by
master reset or by a LOW to HIGH transition on the
MODE input.
2.
H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial
INPUTS
MODE
AR
MR
PH
MODE
H
L
X
X
L
L
H
L
X
X
X
X
X
X
X
H
auto reset disabled
auto reset enabled
(1)
master reset active
normal operation selected
division to output
single-cycle mode
(2)
output initially LOW,
after reset
output initially HIGH,
after reset
X
X
L
L
X
L
L
X
X
L
H
X
RC oscillator
Fig.4
External component connection for RC
oscillator; R
S
≈
2 R
t
.
Typical formula for oscillator
frequency:
f
osc
t
C
t
×
---------------------------------
=
Timing component limitations
The oscillator frequency is mainly determined by
R
t
C
t
, provided R
t
<< R
S
and R
S
C2 << R
t
C
t
. The function of
R
S
is to minimize the influence of the forward voltage
across the input protection diodes on the frequency. The
stray capacitance C2 should be kept as small as possible.
In consideration of accuracy, C
t
must be larger than the
inherent stray capacitance. R
t
must be larger than the
LOCMOS ‘ON’ resistance in series with it, which typically
is 500
at V
DD
= 5 V, 300
at V
DD
= 10 V and 200
at
V
DD
= 15 V.
The recommended values for these components to
maintain agreement with the typical oscillation formula are:
C
t
≥
100 pF, up to any typical value,
10 k
≤
R
t
≤
1 M
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HEF4541BT,512 | 功能描述:計時器和支持產(chǎn)品 PROGRAMMABLE TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 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 |
| HEF4541BT,518 | 功能描述:計時器和支持產(chǎn)品 PROGRAMMABLE TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 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 |
| HEF4541BT,652 | 功能描述:計時器和支持產(chǎn)品 PROGRAMMABLE TIMER RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 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 |
| HEF4541BT,653 | 功能描述:計時器和支持產(chǎn)品 HEF4541BT/SO14/REEL13// RoHS:否 制造商:Micrel 類型:Standard 封裝 / 箱體:SOT-23 內(nèi)部定時器數(shù)量:1 電源電壓-最大:18 V 電源電壓-最小:2.7 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 |
| HEF4541BT | 制造商:NXP Semiconductors 功能描述:IC SM 4000 LOCMOS LOGIC |
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