MAX6733：Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Monitor Down to 0.63V

The MAX6730–MAX6735 single-/dual-/triple-voltage microprocessor (µP) supervisors feature a watchdog timer and manual reset capability. The MAX6730–MAX6735 offer factory-set reset thresholds for monitoring voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The combination of these features significantly improves system reliability and accuracy when compared to separate ICs or discrete components. The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored voltages exceed their respective thresholds. Multiple factory-set reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout periods ranging from 1.1ms to 1120ms. The MAX6730–MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer prevents system lockup during code execution errors. A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watchdog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide an active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, push-pull watchdog output. Other features include a manual reset input (MAX6730/MAX6731/MAX6734/MAX6735) and push-pull reset output (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730-MAX6733 are offered in a tiny SOT23-6 package. The MAX6734/MAX6735 are offered in a space-saving SOT23-8 package. All devices are fully specified over the extended -40°C to +85°C temperature range.

Key Features

VCC1 (Primary Supply) Reset Threshold Voltages from +1.575V to +4.63V
VCC2 (Secondary Supply) Reset Threshold Voltages from +0.79V to +3.08V
Adjustable RSTIN Threshold for Monitoring Voltages Down to +0.63V (MAX6734/MAX6735 Only)
Six Reset Timeout Options
Watchdog Timer with Independent Watchdog Output
- 35s (min) Initial Watchdog Startup Period
- 1.12s (min) Normal Watchdog Timeout Period
Manual Reset Input (MAX6730/MAX6731/MAX6734/MAX6735)
Guaranteed Reset Valid down to VCC1 or VCC2 = +0.8V
Push-Pull active-low RESET or Open-Drain active-low RESET Output
Immune to Short VCC Transients
Low Supply Current: 14µA (typ) at +3.6V
Small 6-Pin and 8-Pin SOT23 Packages

MAX6730, MAX6731, MAX6732, MAX6733, MAX6734, MAX6735: Functional Diagram

Applications/Uses

Computers/Servers
Industrial Equipment
Multivoltage Systems
Portable Battery-Powered Equipment
Printers and Faxes
Set-Top Boxes
Telecom/Networking Equipment

DataSheet

title	Download file
MAX6730-MAX6735 Data Sheet	MAX6730-MAX6735.pdf

Parametrics

Part Number	Reset Thresh. (V)	Reset Out	t_RESET	Watchdog Feature	Watchdog Timeout	Supervisor Features	Reset Thresh. Accur. (%)	I_CC (µA)	Package/Pins	Budgetary Price
Part Number	Reset Thresh. (V)	Reset Out	min	Watchdog Feature	Watchdog Timeout	Supervisor Features	@ +25°C	max	Package/Pins	See Notes
MAX6730	1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Open Drain	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	Manual Reset	2.5	37	SOT/6	$1.54 @1k
MAX6731	1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Push-Pull	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	Manual Reset	2.5	37	SOT/6	$1.46 @1k

Part Number	Interface	Reset Thresh. (V)	Reset Out	t_RESET	Watchdog Feature	Watchdog Timeout	Reset Thresh. Accur. (%)	I_CC (µA)	Package/Pins	Budgetary Price
Part Number	Interface	Reset Thresh. (V)	Reset Out	min	Watchdog Feature	Watchdog Timeout	@ +25°C	max	Package/Pins	See Notes
MAX6732	Factory Fixed	0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Open Drain	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	2.5	37	SOT/6	$1.71 @1k
MAX6733	Factory Fixed	0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Push-Pull	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	2.5	37	SOT/6	-

Part Number	Interface	Reset Thresh. (V)	Reset Out	t_RESET	Watchdog Feature	Watchdog Timeout	Supervisor Features	Reset Thresh. Accur. (%)	I_CC (µA)	Package/Pins	Budgetary Price
Part Number	Interface	Reset Thresh. (V)	Reset Out	min	Watchdog Feature	Watchdog Timeout	Supervisor Features	@ +25°C	max	Package/Pins	See Notes
MAX6734	Factory Fixed R/C Adjustable	0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Open Drain	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	Adjustable Reset Input Manual Reset	2.5	37	SOT/8	$1.86 @1k
MAX6735	Factory Fixed R/C Adjustable	0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5	Active Low Push-Pull	1ms to 15ms 15ms to 85ms 85ms to 300ms >1s	Extended Setup Period Input (WDI) Input/Output (WDI/WDO)	1s to 2s >2s	Adjustable Reset Input Manual Reset	2.5	37	SOT/8	$3.21 @1k

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6733UTLTD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTLTD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTLTD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTLTD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTLTD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTLTD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMRD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMRD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMRD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMRD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6733UTMRD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMRD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTMSD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRDD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRDD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6733UTRDD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRDD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRDD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRDD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRFD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6733UTRHD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRHD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRHD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRHD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRHD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRHD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRVD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRVD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRVD3-T	Active		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRVD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX6733UTRVD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRVD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD3-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD4-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD5-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTRYD6-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTSDD1-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No
MAX6733UTSDD2-T	No Longer Available		SOT,;6 pin;9 mm²	-40°C to +85°C	No

MAX6730-MAX6735.pdf MAX6735

MAX6730-MAX6735.pdf MAX6733