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Table Of Contents

Quad Voltage Microprocessor

Supervisory Circuit

ADM6339

Rev. A

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FEATURES

Accurate monitoring of up to four power supply voltages

6 factory-set threshold options: −5.0 V, +1.8 V, +2.5 V, +3.0 V,

+3.3 V, and +5.0 V

Adjustable input threshold options: −0.5 V (±2.0% accuracy),

+0.62 V (±0.8% accuracy), and +1.23 V

200 ms typical reset timeout

Open-drain

RESET

output (10 μA internal pull-up)

Reset output stage: active low, valid to IN

= 1 V or IN

= 1 V

Low power consumption (55 μA)

Glitch immunity

Specified from −40°C to +85°C

6-lead SOT-23 package

APPLICATIONS

Telecommunications

Microprocessor systems

Data storage equipment

Servers/workstations

FUNCTIONAL BLOCK DIAGRAM

REF

200ms

TIMEOUT

ADM6339

5V PULLUP

08169-001

RESET

Figure 1.

GENERAL DESCRIPTION

The ADM6339 is a high accuracy supervisory circuit capable of

monitoring up to four system supply voltages.

The ADM6339 incorporates a variety of internally pretrimmed

undervoltage threshold options for monitoring −5.0 V, +1.8 V,

+2.5 V, +3.0 V, +3.3 V, and +5.0 V supply voltages. Tolerance levels

of ±5% and ±10% are available. The device is also available

with one to three adjustable threshold options. The adjustable

voltage threshold options are +1.23 V, +0.62 V, and −0.5 V. See

the Ordering Guide section for a list and description of all

available options.

If a monitored power supply voltage decreases below the mini-

mum voltage threshold (or rises above the maximum voltage

threshold for the −0.5 V and −5.0 V input options), a single

active low output asserts, triggering a system reset. The output

is open drain with a weak internal pull-up to the monitored IN

supply of typically 10 µA. After all voltages exceed the selected

threshold level, the reset signal remains low for the reset

timeout period (200 ms typical).

The ADM6339 output remains valid as long as IN

or IN

exceeds

1 V. Unused monitored inputs should not be allowed to float or

to be grounded; instead, they should be connected to a supply

voltage greater than their specified threshold voltages.

The ADM6339 is available in a 6-lead SOT-23 package. The

device operates over the extended temperature range of −40°C

to +85°C.

Summary of content (12 pages)

PAGE 1
Quad Voltage Microprocessor Supervisory Circuit ADM6339 FEATURES FUNCTIONAL BLOCK DIAGRAM IN1 5V PULLUP IN2 IN1 IN2 RESET 200ms TIMEOUT IN3 IN4 ADM6339 VREF 08169-001 Accurate monitoring of up to four power supply voltages 6 factory-set threshold options: −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V Adjustable input threshold options: −0.5 V (±2.0% accuracy), +0.62 V (±0.8% accuracy), and +1.
PAGE 2
ADM6339 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................6 Applications ....................................................................................... 1 Theory of Operation .........................................................................8 Functional Block Diagram ..............................................................
PAGE 3
ADM6339 SPECIFICATIONS VIN2 = 1.0 V to 5.5 V, TA = −40°C to +85°C, unless otherwise noted. Typical values are VIN2 = 3.0 V to 3.3 V, TA = 25°C. Table 1. Parameter OPERATING VOLTAGE RANGE (VIN2) 1 , 2 INPUT CURRENT INx Input Current Min 1.0 Typ Max 5.5 Units V Test Conditions/Comments 25 55 40 115 μA μA μA μA μA μA μA VINx = nominal input voltage for 1.8 V, 2.5 V, and 5.0 V supplies. VIN2 = nominal input voltage for 3.0 V and 3.3 V supplies. VIN2 is also the device power supply.
PAGE 4
ADM6339 ABSOLUTE MAXIMUM RATINGS Table 3. Thermal Resistance Table 2. Parameter VCC, RESET, GND Continuous RESET Current INx (Positive Reset Threshold) IN4 (Negative Reset Threshold, −5 V) IN4 ADM6339Q Model (Negative Reset Threshold, −0.5 V) Storage Temperature Range Operating Temperature Range Lead Temperature (10 sec) Junction Temperature Rating −0.3 V to +6 V 20 mA −0.3 V to +6 V −6 V to +0.3 V −2 V to +0.
PAGE 5
ADM6339 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS IN1 1 6 RESET IN2 2 IN3 3 5 GND TOP VIEW (Not to Scale) 4 IN4 08169-002 ADM6339 Figure 2. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 4 5 6 Mnemonic IN1 IN2 IN3 IN4 GND RESET Description Monitored Input Voltage 1. Monitored Input Voltage 2. IN2 is the power supply input for the ADM6339. Monitored Input Voltage 3. Monitored Input Voltage 4. Ground. Active Low RESET Output.
PAGE 6
ADM6339 TYPICAL PERFORMANCE CHARACTERISTICS VIN2 = VCC = 3.0 V, TA = 25°C, unless otherwise noted. 100 58 IN2 INPUT CURRENT (µA) 56 54 52 50 48 46 44 08169-010 VIN2 = 3.3V 42 VIN2 = 3V 40 –40 –15 10 35 90 80 70 60 50 40 30 RESET ASSERTED ABOVE THIS LINE 20 10 0 85 60 08169-012 MAXIMUM INX TRANSIENT DURATION (µs) 60 0 100 TEMPERATURE (ºC) 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) Figure 3. IN2 Input Current vs. Temperature Figure 6.
PAGE 7
ADM6339 INx C3 INx C3 RESET RESET BwL DC1M C3 BwL DC1M 2.00V/div 1.00V/div –6.000V offset 2.040V offset Timebase 0.0µs Trigger 0.0µs 10.0 µs/div STOP –520mV 2.0 GS/s EDGE NEGATIVE 200kS C2 BwL DC1M C3 BwL DC1M 2.00V/div 2.00V/div –6.000V offset 2.000V offset Figure 9. RESET Pull-Up and Pull-Down Response (10 μs/Div) Figure 11. RESET Timeout Delay (50 ms/Div) –0.490 –0.5V VIN TRIP THRESHOLD (V) 0.625 0.620 0.615 –20 0 20 40 60 80 TEMPERATURE (°C) –0.495 –0.500 –0.505 –0.
PAGE 8
ADM6339 THEORY OF OPERATION The device includes several factory-set voltage threshold options for monitoring −5.0 V, +1.8 V, +2.5 V, +3.0 V, +3.3 V, and +5.0 V supplies. The ADM6339 is available with one to three adjustable threshold options. The adjustable voltage threshold options available are +1.23 V, +0.62 V, and −0.5 V. See the Ordering Guide section for a list and description of all available options.
PAGE 9
ADM6339 When monitoring a voltage more negative than −0.5 V, a scheme similar to that previously described in the Monitoring Negative Voltages < −5.0 V section is used. For an input monitor current error of <1%, the resistor network current should be ≥500 μA (for IIN4 = 5 μA maximum). Calculate R1 based on the desired VINTH reset threshold voltage, using the following equation: R1 = R2((VINTH/VTH) − 1) RESET is open drain with a weak internal pull-up to IN2 of 10 μA (typical).
PAGE 10
ADM6339 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 6 5 4 1 2 3 3.00 2.80 2.60 PIN 1 INDICATOR 0.95 BSC 1.90 BSC 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.50 MAX 0.30 MIN 0.20 MAX 0.08 MIN SEATING PLANE 10° 4° 0° 0.60 BSC 0.55 0.45 0.35 121608-A 1.30 1.15 0.90 COMPLIANT TO JEDEC STANDARDS MO-178-AB Figure 18. 6-Lead Small Outline Transistor Package [SOT-23] (RJ-6) Dimensions shown in millimeters ROUND SPROCKET HOLES 08169-018 PIN 1 MARKER DIRECTION OF FEED Figure 19.
PAGE 11
ADM6339 NOTES Rev.