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參數資料
| 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： | 1/16頁 |
| 文件大小： | 295K |
| 代理商： | LTC1235CS |
1
LTC1235
The LTC1235 provides complete power supply monitoring
and battery control functions for microprocessor reset,
battery backup, RAM write protection, power failure warn-
ing and watchdog timing. The LTC1235 has all the LTC695
features plus conditional battery backup and external reset
control. When an out-of-tolerance power supply condition
occurs, the reset outputs are forced to active states and the
Chip Enable output write-protects external memory. The
RESET output is guaranteed to remain logic low with V
CC
as
low as 1V. External reset control is provided by a debounced
push-button reset input.
The LTC1235 powers the active CMOS RAMs with a charge
pumped NMOS power switch to achieve low dropout and
low supply current. When primary power is lost, auxiliary
power, connected to the battery input pin, provides backup
power to the RAMs. The LTC1235 can be programmed by
a
μ
P signal to either back up the RAMs or not. This extends
the battery life in situations where RAM data need not
always be saved when power goes down.
For an early warning of impending power failure, the
LTC1235 provides an internal comparator with a user-
defined threshold. An internal watchdog timer is also avail-
able, which forces the reset pins to active states when the
watchdog input is not toggled prior to the time-out period.
Microprocessor
Supervisory Circuit
U
S
A
O
PPLICATI
D
U
ESCRIPTIO
S
FEATURE
I
GuaranteedReset Assertion at V
CC
= 1V
I
1.5mA Maximum Supply Current
I
Fast (35ns Max.) Onboard Gating of RAM Chip
Enable Signals
I
Conditional Battery Backup Extends Battery Life
I
4.65V Precision Voltage Monitor
I
Power OK/Reset Time Delay: 200ms
I
External Reset Control
I
Minimum External Component Count
I
1
μ
A Maximum Standby Current
I
Voltage Monitor for Power Fail or Low Battery
Warning
I
Thermal Limiting
I
Performance Specified Over Temperature
I
All the LTC695 Features Plus Conditional Battery
Backup and External Reset Control
I
Critical
μ
P Power Monitoring
I
Intelligent Instruments
I
Battery-Powered Computers and Controllers
I
Automotive Systems
U
A
O
PPLICATI
TYPICAL
BACKUP DUTY CYCLE (%)
0
B
6
8
10
80
LTC1235 TA02
4
2
0
20
40
60
100
1
3
5
7
9
LTC1235
LTC695
(WITHOUT
CONDITIONAL
BATTERY
BACKUP)
Battery Life vs
Backup Duty Cycle
+
+
ADJ
V
IN
V
OUT
10μF
V
IN
≥
7.5V
+5V
100μF
0.1μF
LTC1235
V
OUT
V
CC
V
BATT
PFI
PB RST
WDI
μP NMI
μP
POWER
POWER TO
CMOS RAM
I/O LINE
μP RESET
μP
SYSTEM
0.1μF
+3V
51k
10k
LTC1235 TA1
RESET
PFO
LT1086-5
THE LTC1235 EXTENDS BATTERY LIFE BY PROVIDING BATTERY POWER ONLY WHEN REQUIRED TO BACK UP RAM DATA.
IT SAVES THE BATTERY WHEN NO DATA BACKUP IS NEEDED. THE
μ
P REQUESTS BACKUP WITH THE BACKUP PIN.
I/O LINE
BACKUP
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相關代理商/技術參數 |
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| LTC1235CSW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 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 供應商設備封裝: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 - 監控器 系列:- 其它有關文件:STM6905 View All Specifications 標準包裝:1 系列:- 類型:多壓監控器 監視電壓數目:5 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 140 ms 電壓 - 閥值:2.188V，2.955V，可調，可調，可調 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） 供應商設備封裝:8-TSSOP 包裝:Digi-Reel® 產品目錄頁面: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 - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 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 供應商設備封裝: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 - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 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 供應商設備封裝: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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