SG Micro SGM814 Manuel utilisateur

SGM814/SGM815/SGM816

Ultra-Low Power Voltage Detectors

with Optional Watchdog

SG Micro Corp

www.sg-micro.com

JUNE 2022 –REV. A

GENERAL DESCRIPTION

The SGM814, SGM815 and SGM816 are a family of

complete microprocessor supervisory devices which

combine ultra-low power, supervisory circuits and timer

circuits. System reliability is significantly improved by

such integration compared to the designs using

individual ICs or discrete components. These devices

feature a wide supply voltage from 1V to 5V.

Regardless of whether the detection voltage is high or

low, the output can be forced low through the manual

reset pin (nMR).

If the supply voltage (VDD) exceeds 0.5V during the

power-on period, nRESET will assert low. And when

VDD is under the default voltage threshold, the nRESET

output keeps low. The VHYS design on VDD can avoid

nRESET triggering by mistake.

The SGM814 and SGM815 both have an active-low

open-drain reset output, and can monitor two different

voltages, either PFI or SENSE trigger the threshold, the

nRESET will assert. The SGM816 has an active-low

push-pull reset output and a watchdog timer to monitor

the process.

The devices are available in a Green SOT-23-6

package. They operate over a junction temperature

range of -40℃to +125℃.

FEATURES

●High Accuracy Fixed Detection Options: 1.2V,

1.5V, 1.6V, 2V and 3.3V

●High Trigger Accuracy: 1% (TYP)

●Low Quiescent Current: 1.6μA (TYP)

●Low nRESET Defined Input Voltage: 0.5V

●Delay Time for the Power-on Reset Generator:

140ms

●Reset Output Options:

Open-Drain: SGM814 and SGM815

Push-Pull: SGM816

●Available in a Green SOT-23-6 Package

APPLICATIONS

Microprocessor Systems

Controllers

Battery-Powered Systems

Portable Equipment

Instruments and Apparatus

Communications-Equipment

TYPICAL APPLICATION

SGM815-3.3 DSP

VDD

3.3V

1.6V

nMR

SENSE

nRSTVDD

nRSTSENSE

GND GND

nRESET

CORE

Figure 1. Typical Application Circuit Example

AVAILABLE OPTIONS

Device nRESET Output

nRSTSENSE,

nRSTVDD Output

nPFO Output WDI Input PFI Input nMR Input SENSE Input

SGM814 √(Open-Drain) √(Open-Drain) √√

SGM815 √(Open-Drain)

√√

SGM816 √(Push-Pull) √√√

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

PACKAGE/ORDERING INFORMATION

MODEL PACKAGE

DESCRIPTION

SPECIFIED

TEMPERATURE

RANGE

ORDERING

NUMBER

PACKAGE

MARKING

PACKING

OPTION

SGM814-1.2 SOT-23-6 -40℃to +125℃SGM814-1.2XN6G/TR G6DXX Tape and Reel, 3000

SGM814-1.5 SOT-23-6 -40℃to +125℃SGM814-1.5XN6G/TR G6GXX Tape and Reel, 3000

SGM814-2.0 SOT-23-6 -40℃to +125℃SGM814-2.0XN6G/TR OU9XX Tape and Reel, 3000

SGM814-3.3 SOT-23-6 -40℃to +125℃SGM814-3.3XN6G/TR G6HXX Tape and Reel, 3000

SGM815-1.6 SOT-23-6 -40℃to +125℃SGM815-1.6XN6G/TR G6IXX Tape and Reel, 3000

SGM815-3.3 SOT-23-6 -40℃to +125℃SGM815-3.3XN6G/TR G5LXX Tape and Reel, 3000

SGM816-1.2 SOT-23-6 -40℃to +125℃SGM816-1.2XN6G/TR SWXXX Tape and Reel, 3000

SGM816-1.5 SOT-23-6 -40℃to +125℃SGM816-1.5XN6G/TR G6LXX Tape and Reel, 3000

SGM816-3.3 SOT-23-6 -40℃to +125℃SGM816-3.3XN6G/TR G6MXX Tape and Reel, 3000

MARKING INFORMATION

NOTE: XX = Date Code.

Date Code - Year

Date Code - Week

Serial Number

YYY XX

Green (RoHS & HSF): SG Micro Corp defines "Green" to mean Pb-Free (RoHS compatible) and free of halogen substances. If

you have additional comments or questions, please contact your SGMICRO representative directly.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VDD............................................. -0.3V to 6V

nMR, nRESET (Push-Pull), VnMR, VnRESET (Push-Pull)

.................................................................-0.3V to VDD + 0.3V

All Other Pins....................................................... -0.3V to 6V

Maximum Low Output Current, IOL ................................ ±5mA

Maximum High Output Current, IOH............................... ±5mA

Input Current, IIK (VSENSE < 0V or VSENSE > VDD).......... ±10mA

Output Current, IOK (VOUT < 0V or VOUT > VDD)(2) ........ ±10mA

Package Thermal Resistance

SOT-23-6, θJA .......................................................... 230℃/W

Junction Temperature.................................................+150℃

Storage Temperature Range ....................... -65℃to +150℃

Lead Temperature (Soldering, 10s) ............................+260℃

ESD Susceptibility

HBM (SGM814, SGM815) ........................................... 1500V

HBM (SGM816) ........................................................... 3000V

CDM ............................................................................ 1000V

NOTES:

1. To ensure the reliable running of the device, the continuous

running time of the device at 5V cannot exceed t = 1000h.

2. For push-pull outputs, the output is clamped by the back

gate diodes inside to the IC, and there is no clamp in the

open-drain outputs.

RECOMMENDED OPERATING CONDITIONS

Supply Voltage, VDD..................................................1V to 5V

SENSE Voltage, VSENSE .......................................... 0V to VDD

WDI

High-level Input Voltage (VIH) at nMR ..........0.8 × VDD (MIN)

Low-level Input Voltage (VIL) at nMR ......... 0.3 × VDD (MAX)

Input Transition Rise and Fall Rates at Δt/ΔV at nMR

..................................................................... 100ns/V (MAX)

nMR, PFI Voltage ................................................... 0V to VDD

Operating Junction Temperature Range...... -40℃to +125℃

OVERSTRESS CAUTION

Stresses beyond those listed in Absolute Maximum Ratings

may cause permanent damage to the device. Exposure

absolute maximum rating conditions for extended periods

may affect reliability. Functional operation of the device at any

conditions beyond those indicated in the Recommended

Operating Conditions section

is not implied.

ESD SENSITIVITY CAUTION

This integrated circuit can be damaged if ESD protections are

not considered carefully. SGMICRO recommends that all

integrated circuits be handled with appropriate precautions.

Failure

to observe proper handling

and installation procedures

can cause damage. ESD damage can range from subtle

performance

degradation to

complete device failure. Precision

integrated circuits may be more susceptible to damage

because even small parametric changes could cause the

device not to meet the published specifications.

DISCLAIMER

SG Micro Corp reserves the right to make any change in

circuit

design, or specifications

without prior notice.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

PIN CONFIGURATION AND DESCRIPTION

SGM814 (TOP VIEW)

VDD

nMR PFI

nRESET

GND

nPFO

SOT-23-6

Table 1. SGM814 Pin Description

PIN NAME I/O FUNCTION

1 nRESET O Active-Low Open-Drain Reset Output Pin.

2 GND G Ground.

3 nMR I

Manual Reset Input Pin. nRESET keeps low when nMR is low. When nMR is high, nRESET

becomes high after a timeout period. Leave it floating or connect it to VDD if not used.

4 PFI I

Power-Fail Voltage Monitor Input Pin. When PFI is less than 0.551V, nPFO goes low. Connect it

to VDD if not used.

5 nPFO O

Power-Fail Output Pin. Power-fail output goes low and sinks current when PFI is less than

0.551V; otherwise nPFO stays high.

6 VDD I Power Supply Voltage Pin. Monitor the voltage on VDD.

NOTE: I: input, O: output, G: ground.

Table 2. SGM814 Function Table

nMR

PFI

> 0.551V

> V

IT-

nRESET

nPFO

L 0 X

(1)

L L

L 1 X L H

H 0 0 L L

H 0 1 H L

H 1 0 L H

H 1 1 H H

NOTE:

1. X = Don’t care.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

PIN CONFIGURATION AND DESCRIPTION (continued)

SGM815 (TOP VIEW)

VDD

nMR SENSE

nRSTVDD

GND

nRSTSENSE5

SOT-23-6

Table 3. SGM815 Pin Description

PIN NAME I/O FUNCTION

1 nRSTVDD O Active-Low Open-Drain Reset Output Pin. The logic level is related to VDD and nMR state.

2 GND G Ground.

3 nMR I

Manual Reset Input Pin. Pull it low to force a reset. nRSTVDD and nRSTSENSE keeps low

when nMR is low. When nMR is high, nRESET becomes high after a timeout period.

Leave it

floating or connect it to VDD if not used.

4 SENSE I

Sense Voltage Pin. If the voltage is below 0.551V, the reset asserts. Connect it to VDD if not

used.

5 nRSTSENSE O

Active-Low Open-Drain Reset Output Pin. The logic level is related to SENSE voltage and

nMR state.

6 VDD I Power Supply Voltage Pin. Monitor the voltage on VDD.

NOTE: I: input, O: output, G: ground.

Table 4. SGM815 Function Table

nMR

SENSE

> 0.551V

> V

IT-

nRSTVDD

nRSTSENSE

L X

(1)

X L L

H 0 0 L L

H 0 1 H L

H 1 0 L H

H 1 1 H H

NOTE:

1. X = Don’t care.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

PIN CONFIGURATION AND DESCRIPTION (continued)

SGM816 (TOP VIEW)

VDD

nMR SENSE

nRESET

GND

WDI

SOT-23-6

Table 5. SGM816 Pin Description

PIN NAME I/O FUNCTION

1 nRESET O Active-Low Push-Pull Reset Output Pin.

2 GND G Ground.

3 nMR I

Manual Reset Input Pin. Pull it low to force a reset. nRESET keeps low when nMR is low.

When nMR is high, nRESET becomes high after a timeout period. Leave it floating

connect it to VDD if not used.

4 SENSE I

Sense Voltage Pin. If the voltage is below 0.551V, the reset asserts. Connect it to VDD if not

used.

5 WDI I

Watchdog Timer Input Pin. If the WDI remains high or low for more than the watchdog

timeout period, the watchdog timer expires. The internal watchdog timer is kept clear while a

reset is asserted. The timer is also cleared if the WDI input is changed (on rising or falling

edges).

6 VDD I Power Supply Voltage Pin. Monitor the voltage on VDD.

NOTE: I: input, O: output, G: ground.

Table 6. SGM816 Function Table (1)

nMR

SENSE

> 0.551V

> V

IT-

nRESET

L X

(2)

X L

H 0 1 L

H 1 0 L

NOTES:

1. The watchdog timer function is not included.

2. X = Don’t care.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

ELECTRICAL CHARACTERISTICS

(TJ= -40℃to +125℃, typical values are at TJ= +25℃, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

High-Level Output Voltage VOH

VDD = 3.3V, IOH = -3mA

0.8 × VDD

VDD = 1.8V, IOH = -2mA

0.8 × VDD

VDD = 1.5V, IOH = -1mA

0.8 × VDD

VDD = 1.2V, IOH = -0.4mA

0.8 × VDD

Low-Level Output Voltage VOL

= 3.3V, I

= 3mA

0.3

= 1.5V, I

= 2mA

0.3

VDD = 1.2V, IOL = 1mA

0.3

VDD = 1V, IOL = 500μA

0.3

Low-Level Output Voltage (nRESET Only)

VOL

VDD = 0.5V, IOL = 5μA

0.1

Negative-Going Input Threshold Voltage (1) VIT-

SGM81x-1.2

TJ= +25℃

1.131

1.142

1.154

SGM81x-1.5

1.420

1.434

1.449

SGM81x-1.6

1.506

1.521

1.537

SGM81x-2.0

1.825

1.843

1.861

SGM81x-3.3

2.911

2.941

2.971

SGM81x-1.2

TJ= -40℃to +125℃

1.108

1.176

SGM81x-1.5

1.391

1.477

SGM81x-1.6

1.476

1.566

SGM81x-2.0

1.788

1.898

SGM81x-3.3

2.852

3.030

Negative-Going Input Threshold Voltage (1)

(SENSE, PFI) VIT-(S) TJ= +25℃0.534 0.551 0.568 V

TJ= -40℃to +125℃0.523 0.579

Temperature Coefficient of VIT-, PFI, SENSE TKTJ= -40℃to +125℃-0.003 -0.019 %/K

Hysteresis Accuracy at VDD Input

VHYS/VIT-

1.5

Hysteresis at SENSE, PFI Input

VHYS(S)

VDD ≥1V

High-Level Input Current (nMR)

IIH

nMR = VDD, VDD = 3.3V

-50

High-Level Input Current (SENSE, PFI)

SENSE, PFI = VDD, VDD = 3.3V

-40

High-Level Input Current (WDI)

WDI = VDD, VDD = 3.3V

-60

Low-Level Input Current (nMR)

IIL

nMR = 0V, V

= 3.3V

-39

-32

-25

μA

Low-Level Input Current (SENSE, PFI)

SENSE, PFI, WDI = 0V, V

= 3.3V

-30

Low-Level Input Current (WDI)

WDI = 0V, VDD = 3.3V

-75

High-Level Output Current at nRESET (2)

(Open-Drain)

IOH VDD = VIT-+ 0.2V, VOH = 3.3V 200 nA

Supply Current IDD

= 1V

(average current)

TJ= -40℃to +125℃

1.6 4.5

μA

= 2V

(average current)

1.7 5

= 3.6V

(average current)

1.8 5

= 5.0V

(average current)

2 5

Internal Pull-Up Resistor at nMR

nMR

100

130

kΩ

Input Capacitance at nMR, SENSE, PFI, WDI

= 0V to V

NOTES:

1. Place a 0.1μF bypass capacitor near VDD to ensure the stability of the threshold voltage.

2. Also refers to nRSTVDD and nRSTSENSE.

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

TIMING REQUIREMENTS

(At RL= 1MΩ, CL= 50pF and TJ= -40℃to +125℃, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Timeout Period at WDI tT_OUT 0.5 1.2 1.9 s

Pulse Duration at VDD

VIH = 1.1 × VIT-, VIL = 0.9 × VIT-, VIT-= 1.142V 40

μs

Pulse Duration at nMR VDD ≥ VIT-+ 0.2V, VIL = 0.3 × VDD, VIH = 0.8 × VDD 2

Pulse Duration at SENSE VDD ≥ VIT-, VIH = 1.1 × VIT-(S), VIL = 0.9 × VIT-(S) 25

Pulse Duration at PFI VIH = 1.1 × VIT-(S), VIL = 0.9 × VIT-(S) 25

Pulse Duration at WDI VDD ≥ VIT-, VIL = 0.3 × VDD, VIH = 0.7 × VDD 0.2

SWITCHING CHARACTERISTICS

(At RL= 1MΩ, CL= 50pF and TJ= -40℃to +125℃, unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Delay Time tDVDD ≥1.1 × VIT-, nMR = 0.8 × VDD, s

ee Timing

Requirements

40 140 250 ms

VDD to nRESET or nRSTVDD Propagation

Delay Time, High-to-Low Level Output

tPHL_VDD VIH = 1.1 × VIT-, VIL = 0.9 × VIT-50 μs

SENSE to nRESET or nRSTSENSE

Propagation Delay Time, High-to-Low Level

Output

tPHL_SENSE VIH = 1.1 × VIT-, VIL = 0.9 × VIT-20 μs

PFI to nPFO Propagation Delay Time,

High-to-Low Level Output

tPHL_nPFO VIH = 1.1 × VIT-, VIL = 0.9 × VIT-20 μs

PFI to nPFO Propagation Delay Time,

Low-to-High Level Output

tPLH_nPFO VIH = 1.1 × VIT-, VIL = 0.9 × VIT-550 μs

nMR to nRESET, nRSTVDD, nRSTSENSE

Propagation Delay Time, High-to-Low Level

Output

tPHL_MR VDD ≥ VIT-, VIL = 0.3 × VDD, VIH = 0.8 × VDD 1 1.5 μs

nRESET

IT-

Output Condition

Undefined

nMR

0.5V

Output Condition

Undefined

IT-

+ V

HYS

Figure 2. nRESET Timing Diagram for SGM814

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

SWITCHING CHARACTERISTICS (continued)

PFI

IT-(S)

= 0.551V

Output Condition

Undefined

nPFO

Output Condition

Undefined

IT-(S)

+ V

HYS-(S)

Figure 3. nPFO Timing Diagram for SGM814

nRSTSENSE

nRSTVDD

VDD

VIT-

0.5V

Output Condition

Undefined

VIT-(S) = 0.551V

SENSE

nMR

Output Condition

Undefined

Output Condition

Undefined

Output Condition

Undefined

tDtD

VIT- + VHYS

VIT-(S) + VHYS(S)

Figure 4. Timing Diagram for SGM815

SGM814 Ultra-Low Power Voltage Detectors

SGM815/SGM816 with Optional Watchdog

JUNE 2022

SG Micro Corp

www.sg-micro.com

SWITCHING CHARACTERISTICS (continued)

Output Condition

Undefined

T_OUT

IT-

0.5V

IT-(S)

= 0.551V

SENSE

nRESET

Output Condition

Undefined

WDI

nMR

X = Don’t care

IT-

+ V

HYS

IT-(S)

+ V

HYS(S)

Figure 5. Timing Diagram for SGM816

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