參數(shù)資料
型號(hào)： X40421S14-C
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： Dual Voltage Monitor with Intergrated CPU Supervisor
中文描述： 雙電壓監(jiān)視器集成CPU監(jiān)控
文件頁(yè)數(shù)： 2/25頁(yè)
文件大?。?/td> 156K
代理商： X40421S14-C
X40420/X40421 – Preliminary
Characteristics subject to change without notice.
2 of 25
REV 1.2.14 7/12/02
www.xicor.com
Low V
from low voltage conditions, resetting the system when
V
CC
falls below the minimum V
RESET is active until V
CC
returns to proper operating
level and stabilizes. A second voltage monitor circuit
tracks the unregulated supply to provide a power fail
warning or monitors different power supply voltage.
Three common low voltage combinations are available,
however, Xicor’s unique circuits allows the threshold for
either voltage monitor to be reprogrammed to meet
special needs or to fine-tune the threshold for applica-
tions requiring higher precision.
A manual reset input provides debounce circuitry for
minimum reset component count.
CC
detection circuitry protects the user’s system
TRIP1
point. RESET/
A battery switch circuit compares V
and connects V
OUT
vides voltage to external SRAM or other circuits in the
event of main power failure. The X40420/21 can drive
50mA from V
CC
to 250μA from V
switches to V
BATT
when V
CC
voltage threshold and V
BATT
CC
with V
BATT
input
to whichever is higher. This pro-
BATT
. The device only
drops below the low V
CC
.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable time
out interval, the device activates the WDO signal. The
user selects the interval from three preset values. Once
selected, the interval does not change, even after
cycling the power.
The memory portion of the device is a CMOS Serial
EEPROM array with Xicor’s Block Lock protection. The
array is internally organized as x 8. The device features
an 2-wire interface and software protocol allowing
operation on a two-wire bus.
The device utilizes Xicor’s proprietary Direct Write
cell, providing a minimum endurance of 100,000 cycles
and a minimum data retention of 100 years.
Example Application
Unreg.
Supply
5V
REG
+
Manual
Reset
Enable
SRAM
Addr
Addr
NMI
IRQ
RESET
I
2
C
uC
V
CC
BATT-ON
V
CC
V
BATT
V
OUT
V2MON
V2FAIL
VDO
RESET
MR
SCL SDA
X40420/21
PIN CONFIGURATION
PIN DESCRIPTION
Pin
1
Name
V2FAIL
Function
V2 Voltage Fail Output.
goes HIGH when V2MON exceeds V
V2 Voltage Monitor Input.
LOW. This input can monitor an unregulated power supply with an external resistor divider or can
monitor a second power supply with no external components. Connect V2MON to V
when not used.
Early Low V
CC
Detect.
This open drain output signal goes LOW when
V
When
V
CC
> V
TRIP1
, this pin is pulled high with the use of an external pull up resistor.
This open drain output goes LOW when V2MON is less than V
TRIP2
. There is no power up reset delay circuitry on this pin.
When the V2MON input is less than the V
TRIP2
and
2
V2MON
TRIP2
voltage, V2FAIL goes
SS
or
V
CC
3
LOWLINE
CC
< V
TRIP1
.
V
BATT
WP
V
SS
V
CC
BATT-ON
SDA
SCL
3
4
5
2
1
12
11
10
13
14
LOWLINE
WDO
RESET
7
6
8
9
V2MON
MR
3
4
5
2
1
12
11
10
13
14
7
6
8
9
V
OUT
V2FAIL
V
BATT
WP
V
CC
BATT-ON
SDA
SCL
V
OUT
V
SS
LOWLINE
WDO
RESET
V2MON
MR
V2FAIL
X40420
X40421
14-Pin SOIC, TSSOP
14-Pin SOIC, TSSOP
相關(guān)PDF資料
PDF描述
X40421S14I-A Dual Voltage Monitor with Intergrated CPU Supervisor
X40421S14I-B Dual Voltage Monitor with Intergrated CPU Supervisor
X40421S14I-C Dual Voltage Monitor with Intergrated CPU Supervisor
X40421V14-B Dual Voltage Monitor with Intergrated CPU Supervisor
X40421V14-C Dual Voltage Monitor with Intergrated CPU Supervisor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
X40421S14-CT1 功能描述:IC VOLT MON DUAL SUP/SW 14-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
X40421S14I-A 功能描述:IC VOLT MON DUAL SUP/SW 14-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
X40421S14I-AT1 功能描述:IC VOLT MON DUAL SUP/SW 14-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
X40421S14I-B 功能描述:IC VOLT MON DUAL SUP/SW 14-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
X40421S14I-BT1 功能描述:IC VOLT MON DUAL SUP/SW 14-SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:- 復(fù)位:低有效 復(fù)位超時(shí):最小為 100 ms 電壓 - 閥值:4.38V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:8-TSSOP 包裝:管件
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