CAT8710FTD-GT3 - ON Semiconductor L.L.C.

January, 2012 − Rev. 3

1Publication Order Number:

CAT8710/D

CAT8710

Quad Voltage Supervisor

The CAT8710 is a space-saving, precision quad voltage supervisor,

designed to monitor up to four supply voltages with a single device.

When any supply voltage drops below its preset threshold, the

CAT8710 will output a single reset to the threshold. One CAT8710 IC

eliminates the need for multiple reset circuits, which minimizes

system components and improves reliability.

The CAT8710 provides 2 factory preset thresholds for monitoring

3.3 V, 3.0 V, 2.5 V, and 1.8 V supplies within ±5% and 2

user-selectable thresholds, adjustable down to 0.62 V with 2%

accuracy. On power up, the reset remains low for 120 ms typical, after

all voltages have risen above their selected thresholds. The output

remains valid as long as VDD remains above 1 V.

The CAT8710 is available in a 6−pin TSOT−23 package and

operates over the industrial temperature range of −40°C to +85°C.

Features

•Monitors 4 Power−Supply Voltages Simultaneously

•2 Factory Preset Reset Threshold Options for 3.3 V, 3.0 V, 2.5 V,

and 1.8 V Supplies

•2 User−Programmed Threshold Monitors, Adjustable Down to

0.62 V with 2% Accuracy

•Drop−in replacement to MAX6710

•Low Supply Current: 3 mA (typ)

•Ultra Low Power vs. Maxim

•Reset Timeout Period: 120 ms (typ)

•RESET Valid to VCC = 1 V

•Immune to Short Supply Transients

•Temperature Range: −40°C to +85°C

•Small, TSOT−23 6−Pin Package

•This Device is Pb−Free, Halogen Free/BFR Free and RoHS

Compliant

Applications

•Monitoring of Multiple Power Supply Voltages

Figure 1. Typical Application Circuit

Power

Supplies

VDD

GND

CAT8710

RESET mP

V2/VDD

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PIN CONNECTIONS

(Top View)

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

ORDERING INFORMATION

TSOT−23−6

TD SUFFIX

CASE 419AF

VJ = Specific Device Code

Y = Production Year (last digit)

M = Production Month: 1−9, A, B, C

MARKING DIAGRAM

RESET

GND

V2/VDD

VJYM

CAT8710

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Timer

(120 ms)

VDD

GND

Figure 2. CAT8710 Block Diagram

RESET

V2/VDD

VTH = 0.62 V

VREF3

VREF

Table 1. PIN FUNCTION

Pin Name Function

V1 Adjustable under−voltage detector input.

V2/VDD First preset under−voltage detector input and power for internal circuitry.

V3 Second preset under−voltage detector input.

V4 Adjustable under−voltage detector input.

GND Ground

RESET Open Drain active LOW reset output

Table 2. ORDERING INFORMATION

Part Number

Nominal Input Voltage [V] Supply

Tolerance Package T&R Quantity

V1 V2/VDD V3 V4

CAT8710FTD−GT3

Adj

(Note 2)

3.3 2.5 1.8

5% TSOT−23−6 3,000

CAT8710JTD−GT3 (Note 1) 3.3 2.5 Adj

CAT8710LTD−GT3 (Note 1) 3.3 1.8 Adj

CAT8710NTD−GT3 (Note 1) 3.0 2.5 Adj

CAT8710PTD−GT3 (Note 1) 3.0 1.8 Adj

1. Consult factory for availability.

2. Adjustable threshold voltage when using external resistor divider. The internal voltage threshold is set to 0.62 V.

CAT8710

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Table 3. ABSOLUTE MAXIMUM RATINGS

Rating Value Unit

VDD, Vx, RESET to GND −0.3 to +6.0 V

Continuous RESET Current 20 mA

Operating Temperature Range −40 to +85 °C

Storage Temperature Range −65 to +150 °C

Junction Temperature +150 °C

Lead Temperature (soldering, 10 s) +300 °C

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

Table 4. ELECTRICAL CHARACTERISTICS

(VDD = 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are at VDD = 3.0 V to 3.3 V, TA = +25°C.) (Note 3)

Symbol Parameter Test Conditions Min Typ Max Units

VDD Operating Voltage 1.5 5.5 V

IDD Supply Current on V2/VDD VDD = 5 V 1.2 9 mA

IDD3 Leakage Current on V3 VDD3 = 3.3 V 0.1 1 mA

IADJ Leakage Current, V1, V4 VADJ = 1.0 V 15 50 nA

VREF

VREF3

Threshold Voltage

on V2/VDD and V3 Monitored

voltage

decreasing

VDD = 3.3 V option 3.00 3.08 3.15 V

VDD = 3.0 V option 2.70 2.78 2.85 V

VDD = 2.5 V option 2.25 2.32 2.38 V

VDD = 1.8 V option 1.62 1.67 1.71 V

VTH Adjustable Threshold Voltage

on V1 and V4

Monitored voltage decreasing 0.611 0.620 0.629 V

VHYST Reset Threshold Hysteresis Monitored voltage increasing compared

to monitored voltage decreasing

0.3 %VTH

TCVTH Reset Threshold Temperature

Coefficient

60 ppm/°C

tRD VIN to Reset Delay VIN falling at 10 mV/ms from VTH to

(VTH – 50 mV)

1 6 ms

tRP Reset Timeout Period CAT8710 70 120 240 ms

VOL RESET Output Low VCC ≥ 5 V, ISINK = 2.5 mA 0.05 0.4 V

VCC < 3.3 V, ISINK = 1.5 mA 0.05 0.4

3. 100% production tested at TA = +25°C. Limits over temperature guaranteed by design.

4. The devices are powered from VDD.

5. The RESET output is guaranteed to be in the correct state for VDD down to 1 V.

CAT8710

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TYPICAL CHARACTERISTICS

(VDD = VCC = 3.0 V, TA = +25°C, unless otherwise specified.)

Figure 3. IDD Input Current vs. Temperature Figure 4. IDD Input Current vs. VDD Voltage

TEMPERATURE (°C) VDD, VOLTAGE (V)

6010−40

1.00

1.05

1.10

1.15

1.20

1.25

1.30

6.55.54.53.52.5

1.150

1.155

1.165

1.170

1.180

1.185

1.190

1.200

Figure 5. RESET Delay vs. RESET Threshold

Overdrive (As Monitored Voltage is Decreasing)

Figure 6. RESET Pull−up and Pulldown

Response (CL = 47 pF, RL = 470 kW)

RESET THRESHOLD OVERDRIVE (mV) 500 ms / div

4002000

IN_

Figure 7. RESET Timeout Delay vs.

Temperature

Figure 8. RESET Timeout Delay

TEMPERATURE (°C) 20 ms / div

6010−40

100

110

120

130

140

150

IDD, INPUT CURRENT (mA)

RESET DELAY (ms)

RESET TIMEOUT DELAY (ms)

VDD = 5.5 V

VDD = 3 V

100mV/div

RESET

2 V / div

1.160

1.175

1.195

RESET

2 V / div

IN_

2 V / div

VDD = 5.5 V

VDD = 3 V

CAT8710

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Detailed Description

The CAT8710 is a space-saving, low-power, quad voltage

microprocessor supervisory circuit designed to monitor 4

voltage supplies. The CAT8710 has 2 factory preset

thresholds for monitoring standard power supply voltages of

3.3 V, 3.0 V, 2.5 V, or 1.8 V, and 2 adjustable thresholds for

monitoring voltages as low as 0.62 V.

Each internal voltage comparator has a typical hysteresis

of 0.3% with respect to its reset threshold, which improves

immunity to ambient noise without significantly reducing

threshold accuracy. CAT8710 is designed to ignore short

transients.

Applications Information

Reset Output

CAT8710 provides an extended reset signal 120 ms (typ)

in duration. The output is open drain and requires an external

pull-up resistor to an external power supply. This supply can

be less than or greater than VDD, but should not exceed

5.5 V. When the external pull−up voltage is greater than

VDD reverse current flow from the external pull−up voltage

to VDD is prevented by CAT8710’s internal circuitry.

The CAT8710 is powered by VDD, which is also a

monitored voltage. When any supply drops below its

threshold, the reset output asserts low and remains low as

long as VDD is above 1.0 V.

Figure 9. RESET Output Timing Diagram

Figure 10. Interfacing to Different Logic−Supply

Voltage

3.3 V

5 V

GND

CAT8710

RESET RESET

V2/VDD

Adjustable Thresholds

CAT8710 allows users to create 2 custom voltage

thresholds. The threshold voltage at each adjustable input is

typically 0.62 V. Monitoring of voltages greater than 0.62 V

requires a resistor-divider network to be connected to the

circuit (Figure 11).

VIN +0.62 V (R1 )R2)

or, written in terms of R1:

R1 +R2ǒVIN

0.62 V *1Ǔ

Because the CAT8710 has a guaranteed input current of

less than 50 nA on the adjustable inputs, resistor values up

to 1000 kW can be used for R2 with < 1% error.

Unused Inputs

Connect unused monitor inputs to a supply voltage greater

in magnitude than their specified threshold voltages; use

VDD for normal operation (device power−supply pin). Do

not connect unused monitor inputs to ground or allow them

to float.

Adding Manual Reset Capability

Figure 12 illustrates how to add manual reset to the

CAT8710. Depressing the pushbutton switch short−circuits

the analog input to ground and initiates a RESET pulse. This

technique can be used on either the V1 or V4 inputs. The

switch must be open for at least 120 ms in order to deassert

the RESET output. No external switch debounce is required.

A small capacitor across R2 will improve noise immunity

when using long leads from the pushbutton switch to the

adjustable input.

POR

Applying power to the CAT8710 activates a POR circuit

which activates the reset output (active low). At power−up

POR prevents the system microprocessor from starting to

operate with insufficient voltage and prior to stabilization of

the clock oscillator. It ensures that operation is precluded

until internal registers are properly loaded, FPGA’s have

downloaded their configuration data. The reset signal

remains active until all monitored power supplies have risen

above their minimum preset voltage levels.

Power−Supply Bypassing

All monitored inputs are immune to short supply

transients. For applications where higher immunity is

required, connect a 0.1 mF bypass capacitor from each input

pin to ground very close to CAT8710’s package.

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Figure 11. Setting the Auxiliary Monitor

CAT8710

VIN

VREF

V2/VDD

CAT8710

Manual

Reset

Figure 12. Adding Manual Reset Capability

RESET

CAT8710

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PACKAGE DIMENSIONS

TSOT−23, 6 LEAD

CASE 419AF−01

ISSUE O

E1 E

TOP VIEW

SIDE VIEW END VIEW

LL2

Notes:

(1) All dimensions are in millimeters. Angles in degrees.

(2) Complies with JEDEC MO-193.

SYMBOL

MIN NOM MAX

0º 8º

0.01

0.80

0.30

0.12

0.30

0.05

0.87

0.15

2.90 BSC

2.80 BSC

1.60 BSC

0.95 TYP

0.40

0.60 REF

0.25 BSC

1.00

0.10

0.90

0.45

0.20

0.50

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operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

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CAT8710/D

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