Datasheet

ManualsBrandsANALOG DEVICES ManualsPMICsPMIC - system monitor Dual voltage detector SOT 23 5

Multiple Input Programmable

Supervisory ICs

Data Sheet

ADM6305/ADM6306

Rev. A

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FEATURES

Adjustable input threshold voltage options: 0.4 V and 1.23 V

Pre-trimmed V

threshold options (ADM6306)

Increments between 2.5 V and 5 V

Manual reset input (ADM6306)

4 factory programmed reset timeout delays

1 ms, 20 ms, 140 ms, and 1.12 sec (minimum)

Reset output stage: active low, open drain

Low power consumption: 5 µA typical

Power supply glitch immunity

5-lead SOT-23 package

Temperature range: −40°C to +125°C

APPLICATIONS

Portable/battery-operated equipment

Microprocessor systems

Multivoltage applications

FUNCTIONAL BLOCK DIAGRAMS

Figure 1.

Figure 2.

GENERAL DESCRIPTION

The ADM6305/ADM6306 are dual voltage supervisors

designed to monitor two supplies and provide a reset signal to

DSP- and microprocessor-based systems. Low supply current

and a small form factor make these devices suitable for portable

and battery-operated applications.

If a monitored power supply voltage falls below the minimum

voltage threshold, a single active low output asserts triggering a

system reset. Once all voltages rise above the selected threshold

level, the reset signal remains low for the reset timeout period.

Four reset timeout options are available.

The ADM6305 monitors two supplies via two adjustable

resistor-programmable undervoltage reset inputs. Both RST

IN1 and RST IN2 have a reset threshold of either 0.4 V or

1.23 V depending on the particular model; that is, the RST IN1

and RST IN2 threshold of the ADM6305DxARJZ model is

1.23 V, while in the case of ADM6305DxARJZ1 model, it is

0.4 V. The V

input of the ADM6305 is not a monitored input.

The ADM6306 has one adjustable undervoltage reset input,

RST IN, which features a choice of reset threshold, 0.4 V or

1.23 V (see the Ordering Guide for more information). The

ADM6306 incorporates a variety of internally pretrimmed V

undervoltage threshold options for monitoring supply voltages

in increments between 2.5 V and 5 V. The ADM6306 also

includes a manual reset input.

The ADM6305/ADM6306

RESET

output remains valid as long

as V

exceeds 0.9 V.

The ADM6305/ADM6306 are available in a 5-lead SOT-23

package. These devices are specified over the temperature range

of −40°C to +125°C.

RESET

GENERATOR

RESET

0.4V/1.23V

RST IN1

GND

0.4V/1.23V

RST IN2

ADM6305

09345-001

RESET

GENERATOR

GLITCH

REJECTION

RESET

1.23V

GND

0.4V/1.23V

RST IN

ADM6306

09345-002

Summary of content (12 pages)

PAGE 1
FEATURES Adjustable input threshold voltage options: 0.4 V and 1.23 V Pre-trimmed VCC threshold options (ADM6306) Increments between 2.5 V and 5 V Manual reset input (ADM6306) 4 factory programmed reset timeout delays 1 ms, 20 ms, 140 ms, and 1.12 sec (minimum) Reset output stage: active low, open drain Low power consumption: 5 µA typical Power supply glitch immunity 5-lead SOT-23 package Temperature range: −40°C to +125°C FUNCTIONAL BLOCK DIAGRAMS VCC RST IN1 RESET GENERATOR RESET 0.4V/1.
PAGE 2
ADM6305/ADM6306 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configurations and Function Descriptions ............................5 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................6 Functional Block Diagrams .............................................................
PAGE 3
Data Sheet ADM6305/ADM6306 SPECIFICATIONS VCC = 2.5 V to 5 V for the ADM6305, VCC = (VTH + 2.5%) to 5.5 V for the ADM6306. TA = −40°C to +125°C, unless otherwise noted. Typical values are at TA = 25°C. Table 1. Parameter OPERATING VOLTAGE RANGE, VCC 1 Min 0.9 0.9 Typ Max 5.5 VTH − 1% VTH − 1.5% VTH − 2.5% 5 5 VTH VTH VTH 25 2 × VTH 16 20 VTH + 1% VTH + 1.5% VTH + 2.5% 1.0 20 140 1120 1.4 28 200 1570 2.0 40 280 2240 0.4 0.3 0.3 0.3 0.3 ms ms ms ms V V V V V 0.8 0.
PAGE 4
ADM6305/ADM6306 Data Sheet ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter VCC All Pins (Except VCC) Input/Output Current Rate of Rise, VCC Storage Temperature Range Operating Temperature Range Lead Temperature (10 sec) Junction Temperature Rating −0.3 V to +6 V −0.3 V to (VCC + 0.3 V) 20 mA 100 V/µs −65°C to +160°C −40°C to +125°C 300°C 150°C Table 3.
PAGE 5
Data Sheet ADM6305/ADM6306 RESET 1 5 VCC 3 RST IN2 ADM6305 GND 2 TOP VIEW (Not to Scale) RST IN1 3 09345-003 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 3. ADM6305 Pin Configuration Table 4. ADM6305 Pin Function Descriptions Mnemonic Description 1 2 3 RESET GND RST IN1 4 RST IN2 5 VCC Active Low, Open-Drain RESET Output. Ground. Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold.
PAGE 6
ADM6305/ADM6306 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 6.0 90 80 1mV/1µs PROPAGATION DELAY (µs) SUPPLY CURRENT (µA) 5.5 VCC = 4.5V 5.0 VCC = 5.5V 4.5 VCC = 2.5V 4.0 VCC = 3.5V 70 60 10mV/1µs 50 40 30 20 3.5 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) 0 09345-005 3.0 –40 20 40 60 80 100 120 125 Figure 8. VCC Falling Propagation Delay vs. Temperature 1.10 10k TRANSIENT DURATION (µs) 1.05 1.00 0.
PAGE 7
Data Sheet ADM6305/ADM6306 10k 10k TRANSIENT DURATION (µs) 5V TRANSIENT DURATION (µs) 3V 10 1 0 200 400 600 800 1000 1200 OVERDRIVE, VREF – VRST IN (mV) Figure 11. Maximum Transient Duration vs. RST IN (VTH = 1.23 V) Threshold Overdrive 10mV/1µs 40 20 40 60 80 TEMPERATURE (°C) 100 120 125 09345-012 RST INx PROPAGATION DELAY (µs) 60 20 200 300 Figure 13. Maximum Transient Duration vs. RST INx (VTH = 0.
PAGE 8
ADM6305/ADM6306 Data Sheet THEORY OF OPERATION The ADM6305/ADM6306 are compact, low power supervisory circuits capable of monitoring two voltage rails. If a monitored voltage drops below its associated threshold, the active low reset output asserts low. The ADM6305 monitors two supplies via two adjustable resistor-programmable undervoltage reset inputs. Both RST IN1 and RST IN2 have a reset threshold of either 0.4 V or 1.
PAGE 9
Data Sheet ADM6305/ADM6306 OPTIONS Table 6. ADM6306 VCC Reset Voltage Threshold Options Reset Threshold Number 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 Min 2.463 2.591 2.66 2.758 2.886 2.955 3.034 3.152 3.251 3.349 3.448 3.546 3.645 3.743 3.842 3.94 4.039 4.137 4.236 4.314 4.433 4.561 4.63 4.728 4.827 4.925 TA = 25°C Typ 2.5 2.63 2.7 2.8 2.93 3 3.08 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4 4.1 4.2 4.3 4.38 4.5 4.63 4.7 4.8 4.9 5.0 Max 2.538 2.669 2.741 2.842 2.974 3.045 3.
PAGE 10
ADM6305/ADM6306 Data Sheet ADM6305D_ARJZ_-RL7 TEMPERATURE RANGE A: –40°C TO +125°C RST IN1 & RST IN2 ADJUSTABLE THRESHOLD 1:0.4V & 0.4V BLANK: 1.23V & 1.23V PACKAGE DESIGNATOR RJ = SOT-23 Z = LEAD-FREE 09345-016 PACKING MATERIAL RL7 = 7” TAPE & REEL (3000 PIECE QUANTITY) RESET TIMEOUT PERIOD CODE (1 TO 4) Figure 16.
PAGE 11
Data Sheet ADM6305/ADM6306 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 5 1 4 2 3.00 2.80 2.60 3 0.95 BSC 1.90 BSC 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.50 MAX 0.35 MIN 0.20 MAX 0.08 MIN 10° 5° 0° SEATING PLANE 0.60 BSC 0.55 0.45 0.35 11-01-2010-A 1.30 1.15 0.90 COMPLIANT TO JEDEC STANDARDS MO-178-AA Figure 18. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters ROUND SPROCKET HOLES 09345-019 PIN 1 MARKER DIRECTION OF FEED Figure 19.