X40421 Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

X40421

Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

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	Technical Documentation		Tools And Support
	Pricing / Samples		Related Devices

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	X40421EVAL

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	X40421EVAL	Details
	X40421S14IZ-A	Details
	X40421S14IZ-AT1	Details
	X40421S14IZ-B	Details
	X40421S14IZ-BT1	Details
	X40421S14Z-A	Details
	X40421S14Z-AT1	Details
	X40421S14Z-B	Details
	X40421S14Z-BT1	Details
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Datasheet
	X40421
	Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

# of Voltage Monitors

V_S Range (V)

2.7 to 5.5
2.7 to 5.5
2.7 to 3.6

Voltage Threshold 1

4.6 (1%)
4.6 (1%)
2.9 (1.7%)

Voltage Threshold 2

2.9 (1.7%)
2.6 (2%)
1.6 (3%)

Reset Output Type

Active Low

Watchdog Timer (s)

OFF, 0.025, 0.2, 1.4

Manual Reset

Bus Interface

I²C

EEPROM Size (kbits)

Battery Montor and Switchover

Fault Detection Register

Suffix

-A
-B
-C

POR (ms)

50, 200, 400, 800

RTC Function

Product Information

Key Features

Dual voltage detection and reset assertion
- Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
- V_TRIP2 programmable down to 0.9V
- Adjust low voltage reset threshold voltages using special programming sequence
- Reset signal valid to V_CC = 1V
- Monitor two voltages or detect power fail
Battery switch backup
V_OUT: 5mA to 50mA from V_CC; or 250μA from V_BATT
Fault detection register
Selectable power-on reset timeout (0.05s, 0.2s, 0.4s, 0.8s)
Selectable watchdog timer interval (25ms, 200ms, 1.4s, off)
Debounced manual reset input
Low power CMOS
- 25μA typical standby current, watchdog on
- 6μA typical standby current, watchdog off
- 1μA typical battery current in backup mode
4Kbits of EEPROM
- 16 byte page write mode
- Self-timed write cycle
- 5ms write cycle time (typical)
Built-in inadvertent write protection
- Power-up/power-down protection circuitry
- Block lock protect 0 or 1/2, of EEPROM
400kHz 2-wire interface
2.7V to 5.5V power supply operation
Monitor voltages: 5V to 1.6V
Memory security
Battery switch backup
V_OUT 5mA to 50mA
Available packages
- 14 Ld SOIC, TSSOP
Pb-free plus anneal available (RoHS compliant)

Description

The X40420, X40421 combines power-on reset control, watchdog timer, supply voltage supervision, and secondary supervision, manual reset, and Block Lock™ protect serial EEPROM in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

Applying voltage to V_CC activates the power-on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code.

Pricing / Packaging / Samples / Ordering

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

	Part No.	Design-In Status	Temp.	Package	MSL	Price US $

	X40421EVAL	Active		Eval Board	N/A	Contact Us

	X40421S14IZ-A	Active	Ind	14 Ld SOIC	3	2.20

	X40421S14IZ-AT1	Active	Ind	14 Ld SOIC T+R	3	2.20

	X40421S14IZ-B	Active	Ind	14 Ld SOIC	3	2.20

	X40421S14IZ-BT1	Active	Ind	14 Ld SOIC T+R	3	2.20

	X40421S14Z-A	Active	Comm	14 Ld SOIC	3	2.09

	X40421S14Z-AT1	Active	Comm	14 Ld SOIC T+R	3	2.09

	X40421S14Z-B	Active	Comm	14 Ld SOIC	3	2.09

	X40421S14Z-BT1	Active	Comm	14 Ld SOIC T+R	3	2.09

	X40421S14-A	InActive	Comm	14 Ld SOIC	1	N/A

	X40421S14-AT1	InActive	Comm	14 Ld SOIC T+R	1	N/A

	X40421S14-B	InActive	Comm	14 Ld SOIC	1	N/A

	X40421S14-BT1	InActive	Comm	14 Ld SOIC T+R	1	N/A

	X40421S14-C	InActive	Comm	14 Ld SOIC	1	N/A

	X40421S14-CT1	InActive	Comm	14 Ld SOIC T+R	1	N/A

	X40421S14I-AT1	InActive	Ind	14 Ld SOIC T+R	1	N/A

	X40421S14I-B	InActive	Ind	14 Ld SOIC	1	N/A

	X40421S14I-BT1	InActive	Ind	14 Ld SOIC T+R	1	N/A

	X40421S14I-C	InActive	Ind	14 Ld SOIC	1	N/A

	X40421S14I-CT1	InActive	Ind	14 Ld SOIC T+R	1	N/A

	X40421V14-A	InActive	Comm	14 Ld TSSOP	1	N/A

	X40421V14-AT1	InActive	Comm	14 Ld TSSOP T+R	1	N/A

	X40421V14-B	InActive	Comm	14 Ld TSSOP	1	N/A

	X40421V14-BT1	InActive	Comm	14 Ld TSSOP T+R	1	N/A

	X40421V14-CT1	InActive	Comm	14 Ld TSSOP T+R	1	N/A

	X40421V14I-A	InActive	Ind	14 Ld TSSOP	1	N/A

	X40421V14I-AT1	InActive	Ind	14 Ld TSSOP T+R	1	N/A

	X40421V14I-B	InActive	Ind	14 Ld TSSOP	1	N/A

	X40421V14I-BT1	InActive	Ind	14 Ld TSSOP T+R	1	N/A

	X40421V14I-CT1	InActive	Ind	14 Ld TSSOP T+R	1	N/A

	X40421S14I-A	To Be Discontinued	Ind	14 Ld SOIC	1	2.64

	X40421V14-C	To Be Discontinued	Comm	14 Ld TSSOP	1	2.88

	X40421V14I-C	To Be Discontinued	Ind	14 Ld TSSOP	1	3.03

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
SMD = Standard Microcircuit Drawing

Technical Documentation

Application Note(s):
CPU Supervisor and System Management Devices for Battery Applications: Using the X40420, X40421 as a Battery Backup Switch
Datasheet(s):
Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

Tools And Support
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Application Block Diagrams

Applications

Communications equipment
- Routers, hubs, switches
- Disk arrays
Industrial systems
- Process control
- Intelligent instrumentation
Computer systems
- Desktop computers
- Network servers

Related Devices

Parametric Table

	X40020		Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch
	X40415		Dual Voltage Monitor with Integrated CPU Supervisor
	X40420		Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch