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參數(shù)資料
| 型號： | LTC1235CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Microprocessor Supervisory Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | PLASTIC, SOL-16 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 295K |
| 代理商： | LTC1235CS |
8
LTC1235
U
S
A
O
PPLICATI
U
U
To help prevent mistriggering due to transient loads, V
CC
pin should be bypassed with a 0.1
μ
F capacitor with the
leads trimmed as short as possible.
LOW LINE is the output of the precision voltage compara-
tor C1. When V
CC
falls below the reset voltage threshold,
LOW LINE goes low. LOW LINE returns high as soon as
V
CC
rises above the reset voltage threshold.
Push-Button Reset
The LTC1235 provides an logic input pin for direct
connection to a push-button. The push-button reset input,
PB RST, requires an active low signal. Internally, this input
signal is debounced and timed for a minimum of 40ms.
When this condition is satisfied, the reset pulse generator
forces the reset outputs to active states. The reset signals
will remain in active states for a minimum of 140ms from
the moment the push-button reset input is released from
logic low level (Figure 2).
Power Monitoring
The LTC1235 uses a bandgap voltage reference and a
precision voltage comparator C1 to monitor the 5V supply
input on V
CC
(see BLOCK DIAGRAM). When V
CC
falls
below the reset voltage threshold, the reset outputs are
forced to active states. The reset voltage threshold ac-
counts for a 5% variation on V
CC
, so the reset outputs
become active when V
CC
falls below 4.75V (4.65V typical).
On power-up, the reset signals are held active states for a
minimum of 140ms after the reset voltage threshold is
reached to allow the power supply and microprocessor to
stabilize. On power-down, the RESET signal remains ac-
tive low even with V
CC
as low as 1V. This capability helps
hold the microprocessor in stable shutdown condition.
Figure 1 shows the timing diagram of the RESET signal.
The precision voltage comparator, C1, typically has 40mV
of hysteresis which ensures that glitches at V
CC
pin do not
activate the reset outputs. Response time is typically 10
μ
s.
Figure 1. Reset Active Time
Figure 2. Push-Button Reset
V
CC
t1
t1 = RESET ACTIVE TIME
V1 = RESET VOLTAGE THRESHOLD
V2 = RESET VOLTAGE THRESHOLD +
RESET THRESHOLD HYSTERESIS
t1
V2
V2
V1
V1
LTC1235 F01
RESET
LOW LINE
LOGIC LOW
t1
LOGIC
HIGH
t2
LOGIC HIGH
LOGIC LOW
V
CC
= 5V
RESET
RESET
PB RST
t1 = PUSH-BUTTON RESET LOW TIME
t2 = RESET ACTIVE TIME
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| LTC1235CSW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC1235CSW#PBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關(guān)文件:STM6905 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:5 輸出:開路漏極或開路集電極 復(fù)位:低有效 復(fù)位超時:最小為 140 ms 電壓 - 閥值:2.188V，2.955V，可調(diào)，可調(diào)，可調(diào) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1197 (CN2011-ZH PDF) 其它名稱:497-8728-6 |
| LTC1235CSW#TR | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC1235CSW#TRPBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| LTC1235CSWPBF | 制造商:Linear Technology 功能描述:Supervisor 4.65V Reset Watchdog SOIC16W |
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