MAX6721 datasheet(3/19 Pages) MAXIM

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Dual/Triple Ultra-Low-Voltage SOT23 µP

Supervisory Circuits

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ELECTRICAL CHARACTERISTICS (continued)

(VCC1 = VCC2 = 0.8V to 5.5V, GND = 0, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VCC to Reset Output Delay

tRD

VCC1 = (VTH1+ 100mV) to (VTH1 - 100mV) or

VCC2 = (VTH2 + 75mV) to (VTH2 - 75mV)

µs

1.1

1.65

2.2

8.8

13.2

17.6

140

210

280

420

560

840

1120

Reset Timeout Period

tRP

1120

1680

2240

ADJUSTABLE RESET COMPARATOR INPUT (MAX6719/MAX6720/MAX6723–MAX6727)

RSTIN Input Threshold

VRSTIN

611

626.5

642

RSTIN Input Current

IRSTIN

-25

+25

RSTIN Hysteresis

3mV

RSTIN to Reset Output Delay

tRSTIND

VRSTIN to (VRSTIN - 30mV)

µs

POWER-FAIL INPUT (MAX6728/MAX6729)

PFI Input Threshold

VPFI

611

626.5

642

PFI Input Current

IPFI

-25

+25

PFI Hysteresis

VPFH

3mV

PFI to PFO Delay

tDPF

(VPFI + 30mV) to (VPFI - 30mV)

µs

MANUAL RESET INPUT (MAX6715–MAX6722/MAX6725–MAX6729)

VIL

0.3

✕ VCC1

MR Input Voltage

VIH

0.7

✕ VCC1

MR Minimum Pulse Width

1µs

MR Glitch Rejection

100

MR to Reset Delay

tMR

200

MR Pullup Resistance

Ω

WATCHDOG INPUT (MAX6721–MAX6729)

First watchdog period after reset timeout

period

Watchdog Timeout Period

tWD

Normal mode

1.12

1.68

2.24

WDI Pulse Width

tWDI

(Note 2)

VIL

0.3

✕ VCC1

WDI Input Voltage

VIH

0.7

✕ VCC1

WDI Input Current

IWDI

WDI = 0 or VCC1-1

µA

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