MAX6854, MAX6855, MAX6856, MAX6858, MAX6860, MAX6861, MAX6862, MAX6863, MAX6864, MAX6865, MAX6866, MAX6867, MAX6868, MAX6869 Nanopower µP Supervisory Circuits with Manual Reset and Watchdog Timer

Description

The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 ultra-low-current (170nA, typ) microprocessor (µP) supervisory circuits combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. These devices assert a reset signal whenever the monitored voltage drops below the factory-trimmed reset threshold voltage, manual reset is asserted, or the watchdog timer expires. The reset output remains asserted for a minimum timeout period after V_CC rises above the reset threshold and manual reset is deasserted. Factory-trimmed reset threshold voltages are offered from +1.575V to +4.625V in approximately 100mV increments (see the Threshold Suffix Guide in the full data sheet). Each device is offered with six minimum reset timeout options, ranging from 10ms to 1200ms.

The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–MAX6869 are offered in a variety of configurations (see the Selector Guide in the full data sheet). The MAX6854/MAX6855/MAX6856/MAX6861–MAX6869 provide a manual reset input, MR-bar. The MAX6864–MAX6869 offer a watchdog timer that monitors activity at the WDI input to prevent code execution errors. The MAX6864–MAX6869 offer watchdog timeout options of 3.3s or 209s (typ). The MAX6861/MAX6862/MAX6863 feature a pin-selectable reset delay period of 10ms or 150ms (min). Push-pull active-low, push-pull active-high, and open-drain active-low reset outputs are available.

Key Features

Applications/Uses

Ultra-Low 170nA (typ) Supply Current
Reset Thresholds from +1.575V to +4.625V in Approximately 100mV Increments
Six Minimum Reset Timeout Period Options from 10ms to 1200ms
Manual Reset Option
Watchdog Timer Option
Pin-Selectable 10ms/150ms (min) Reset Timeout Period (MAX6861/MAX6862/MAX6863)
Immune to Short V_CC Transients
Guaranteed Reset Valid to V_CC = +1.1V
Three Reset Output Options:
- Push-Pull active-low RESET
- Push-Pull RESET
- Open-Drain active-low RESET
No External Components
Small 5-Pin SOT23 Package
Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)

	Glucose Monitors/Patient Monitors
	MP3 Players/Pagers
	PDAs and Cell Phones
	Portable Battery-Powered Equipment

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

Price^**

MAX6854

1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

No Watchdog

Manual Reset

2.5

$0.92 @ 1k

MAX6855

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

No Watchdog

Manual Reset

$0.83 @ 10k

MAX6856

Open Drain

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

No Watchdog

Manual Reset

$0.92 @ 1k

MAX6858

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

No Watchdog

$0.83 @ 10k

MAX6860

Open Drain

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

No Watchdog

$0.83 @ 10k

MAX6861

Push-Pull

1ms to 15ms
85ms to 300ms

No Watchdog

Manual Reset

$0.87 @ 5k

MAX6862

Push-Pull

1ms to 15ms
85ms to 300ms

No Watchdog

Manual Reset

$0.92 @ 1k

MAX6863

Open Drain

1ms to 15ms
85ms to 300ms

No Watchdog

Manual Reset

$0.92 @ 1k

MAX6864

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.18 @ 1k

MAX6865

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.07 @ 10k

MAX6866

Open Drain

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.18 @ 1k

MAX6867

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.07 @ 10k

MAX6868

Push-Pull

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.07 @ 10k

MAX6869

Open Drain

1ms to 15ms
15ms to 85ms
85ms to 300ms
300ms to 1s

Input (WDI)

>2s

Manual Reset

$1.07 @ 10k

See All Supervisors (1 Monitored Voltage) (270)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

MAX6854

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX6854UK38D2+T

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-40°C to +85°C

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MAX6854UK35D6+T

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MAX6854UK35D5+T

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MAX6854UK35D4+T

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MAX6854UK35D3+T

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MAX6854UK35D2+T

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MAX6854UK35D1+T

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MAX6854UK34D6+T

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MAX6854UK34D5+T

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MAX6854UK34D4+T

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MAX6854UK34D3+T

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MAX6854UK36D1+T

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MAX6854UK36D2+T

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MAX6854UK36D3+T

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MAX6854UK38D1+T

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MAX6854UK37D6+T

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MAX6854UK37D5+T

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MAX6854UK37D4+T

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MAX6854UK37D3+T

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MAX6854UK37D2+T

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MAX6854UK37D1+T

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MAX6854UK36D6+T

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MAX6854UK36D5+T

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MAX6854UK36D4+T

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MAX6854UK34D2+T

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MAX6854UK34D1+T

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MAX6854UK33D6+T

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MAX6854UK31D2+T

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MAX6854UK31D1+T

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MAX6854UK30D6+T

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MAX6854UK30D5+T

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MAX6854UK30D4+T

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MAX6854UK30D3+T

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MAX6854UK30D2+T

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MAX6854UK30D1+T

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MAX6854UK29D6+T

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MAX6854UK29D5+T

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MAX6854UK31D4+T

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MAX6854UK31D5+T

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MAX6854UK31D6+T

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MAX6854UK33D5+T

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MAX6854UK33D4+T

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MAX6854UK33D3+T

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MAX6854UK33D2+T

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MAX6854UK33D1+T

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MAX6854UK32D6+T

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MAX6854UK32D5+T

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MAX6854UK32D4+T

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MAX6854UK32D2+T

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MAX6854UK32D1+T

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MAX6854UK29D4+T

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MAX6854UK38D3+T

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MAX6854UK46D6+T

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MAX6854UK44D4+T

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MAX6854UK44D3+T

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MAX6854UK44D2+T

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MAX6854UK44D1+T

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MAX6854UK43D6+T

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MAX6854UK43D5+T

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MAX6854UK43D4+T

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MAX6854UK43D3+T

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MAX6854UK43D2+T

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MAX6854UK43D1+T

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MAX6854UK44D5+T

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MAX6854UK44D6+T

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MAX6854UK45D1+T

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MAX6854UK46D5+T

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MAX6854UK46D4+T

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MAX6854UK46D3+

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MAX6854UK46D2+T

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MAX6854UK46D1+T

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MAX6854UK45D6+T

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MAX6854UK45D5+T

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MAX6854UK45D4+T

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MAX6854UK45D3+T

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MAX6854UK45D2+T

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MAX6854UK42D6+T

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MAX6854UK42D5+T

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MAX6854UK42D4+T

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MAX6854UK40D2+T

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MAX6854UK40D1+T

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MAX6854UK39D6+T

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MAX6854UK39D5+T

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MAX6854UK39D4+T

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MAX6854UK39D3+T

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MAX6854UK39D2+T

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MAX6854UK39D1+T

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MAX6854UK38D6+T

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MAX6854UK38D5+T

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MAX6854UK40D3+T

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MAX6854UK40D4+T

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MAX6854UK40D5+T

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MAX6854UK42D3+T

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MAX6854UK42D2+T

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MAX6854UK42D1+T

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MAX6854UK41D6+T

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MAX6854UK41D5+T

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MAX6854UK41D4+T

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MAX6854UK41D3+T

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MAX6854UK41D2+T

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