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參數(shù)資料
| 型號： | LTC690 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Microprocessor Supervisory Circuits(μP監(jiān)控電路) |
| 中文描述： | 微處理器監(jiān)控電路（微處理器監(jiān)控電路） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 145K |
| 代理商： | LTC690 |
14
LTC 690/LTC 691
LTC 694/LTC 695
Low
External Clock Input
1024 clks
400ms
C
70pF
4096 clks
1.6 sec
C
70pF
512 clks
200ms
C
70pF
2048 clks
800ms
C
70pF
Low
External Capacitor*
Floating or High
Floating or High
Low
100ms
1.6 sec
1.6 sec
1.6 sec
50ms
50ms
200ms
200ms
Floating or High
U
S
A
O
PPLICATI
U
U
IMMEDIATELY
AFTER RESET
(Long Period)
NORMAL
(Short Period)
WATCHDOG TIME-OUT PERIOD
RESET ACTIVE TIME
LTC691
LTC695
OSC IN
OSC SEL
Table 2. LTC691 and LTC695 Reset Active Time and Watchdog Time-Out Selections
Figure 13. The External Push-Button Reset
Figure 14. The External Push-Button Reset with the LTC1235
Push-Button Reset
The LTC690 family does not provide a logic input for direct
connection to a pushbutton. However, a push-button in
series with a 100
resistor connected to the RESET output
pin (Figure 13) provides an alternative for manual reset.
Connecting a 0.1
μ
F capacitor to the RESET pin debounces
the push-button input.
The 100
resistor in series with the push-button is
required to prevent the ringing, due to the capacitance and
lead inductance, from pulling the RESET pins of the MPU
and LTC69X below ground.
If a dedicated pushbutton reset input is desired, the
LTC1235 is a good choice (Figure 14). It has all the
functions of the LTC695 and provides push-button reset
as an extra feature. Its push-button is internally debounced
and invokes the normal 200ms reset sequence. This
eliminates the need for the 100
resistor and 0.1
μ
F
capacitor. It also provides a more consistent reset pulse.
5V
100
V
CC
LTC690/LTC691
LTC694/LTC695
GND
690 F13
RESET
0.1
μ
F
MPU
(e.g. 6805)
RESET
5V
V
CC
LTC1235
GND
690 F14
RESET
MPU
(e.g. 6805)
RESET
PBRST
*The nominal internal frequency is 10.24kHz. The nominal oscillator frequency with external capacitor is f
OSC
(Hz) =
184,000
C(pF) 1025
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC690_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC6900 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Power, 1kHz to 20MHz Resistor Set SOT-23 Oscillator |
| LTC6900CS5 | 制造商:Linear Technology 功能描述:LOW POWER, 1KHZ TO 20MHZ RESISTOR SET SOT-23 OSCILLATOR |
| LTC6900CS5#PBF | 制造商:Linear Technology 功能描述:IC, PRECISION OSC, 20MHZ, 5.5V, TSOT235; Operating Mode:-; Frequency:20MHz; Supply Voltage Min:2.7V; Supply Voltage Max:5.5V; Digital IC Case Style:TSOT-23; No. of Pins:5; Clock External Input:No; Operating Temperature Min:-40C ;RoHS Compliant: Yes |
| LTC6900CS5#TR | 功能描述:IC OSC SILICON 20MHZ TSOT23-5 RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 可編程計(jì)時(shí)器和振蕩器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:45 系列:- 類型:溫度 - 補(bǔ)償晶體振蕩器（TCXO） 計(jì)數(shù):- 頻率:25MHz 電源電壓:3.135 V ~ 3.465 V 電流 - 電源:1.5mA 工作溫度:-40°C ~ 85°C 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 包裝:管件 供應(yīng)商設(shè)備封裝:16-SOIC W 安裝類型:表面貼裝 |
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