ADM6305

Multiple Input Programmable Supervisory ICs ADM6305/ADM6306 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 0.4V/1.23V RST IN2 RESET ADM6305 0.4V/1.23V 09345-001 GND Figure 1. VCC APPLICATIONS Portable/battery-operated equipment Microprocessor systems Multivoltage applications 1.23V RST IN RESET GENERATOR 0.4V/1.23V VCC RESET ADM6306 MR 09345-002 GLITCH REJECTION GND 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 VCC 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 VCC 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 VCC 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. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. 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All rights reserved. ADM6305/ADM6306 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagrams ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 Thermal Resistance ...................................................................... 4 ESD Caution .................................................................................. 4 Pin Configurations and Function Descriptions ............................5 Typical Performance Characteristics ..............................................6 Theory of Operation .........................................................................8 Input Configuration ......................................................................8 Reset Output Configuration ........................................................8 Manual Reset..................................................................................8 Options ...............................................................................................9 Outline Dimensions ....................................................................... 11 Ordering Guide .......................................................................... 11 REVISION HISTORY 10/10—Revision 0: Initial Version Rev. 0 | Page 2 of 12 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 INPUT CURRENT, ICC VCC THRESHOLD VOLTAGE (ADM6306)2 VTH − 1% VTH − 1.5% VTH − 2.5% Min 0.9 0.9 Typ Max 5.5 16 20 VTH + 1% VTH + 1.5% VTH + 2.5% Unit V V µA µA V V V ppm/°C mV ms ms ms ms V V V V V V V V V µs µs µs ns kΩ V V nA nA mV V V V nA nA Test Conditions/Comments VCC that guarantees valid output VCC = 5.5 V, TA = −40°C to +85°C VCC = 5.5 V, TA = −40°C to +125°C TA = 25°C TA = −40°C to +85°C TA = −40°C to +125°C RESET THRESHOLD TEMPERATURE COEFFICIENT RESET THRESHOLD HYSTERESIS (VHYST) RESET TIMEOUT PERIOD (tRP) ADM630xD1 ADM630xD2 ADM630xD3 ADM630xD4 RESET OUTPUT VOLTAGE (VOL) 5 5 VTH VTH VTH 25 2 × VTH 1.4 28 200 1570 1.0 20 140 1120 2.0 40 280 2240 0.4 0.3 0.3 0.3 0.3 0.8 0.3 × VCC VCC > 4.25 V, ISINK = 3.2 mA VCC > 2.5 V, ISINK = 1.2 mA VCC > 1.2 V, ISINK = 500 μA VCC > 1 V, ISINK = 50 μA VCC > 0.9 V, ISINK = 25 μA VTH > 4.0 V VTH < 4.0 V VTH > 4.0 V VTH < 4.0 V TA = 0°C to +70°C TA = −40°C to +125°C MR INPUT (ADM6306) VIL VIH MR Minimum Input Pulse Width MR Glitch Rejection MR To Reset Delay MR Pull-Up Resistance 1.23 V ADJUSTABLE RESET COMPARATOR INPUT RST INx Input Threshold, VRSTH 2.4 0.7 × VCC 1 1.5 0.1 500 63.5 1.23 1.23 32 1.22 1.211 1.20 −25 −25 100 1.24 1.249 1.26 +25 +25 RST INx Input Current, IRST INx RST INx Hysteresis 0.4 V ADJUSTABLE RESET COMPARTOR INPUT RST INx Input Threshold, VRSTH TA = 25°C TA = −40°C to +85°C TA = −40°C to +125°C 0 V < VRST IN < VCC – 0.3 V3, TA = −40°C to +85°C VRST IN = VRSTH 2.5 0.396 0.394 0.39 −25 −25 0.40 0.40 0.40 0.404 0.406 0.41 +25 +25 RST INx Input Current, IRST INx TA = 25°C TA = −40°C to +85°C TA = −40°C to +125°C 0 V < VRST INx < VCC – 0.3 V3, TA = −40°C to +85°C VRST IN = VRSTH 1 2 The ADM6305 switches from undervoltage reset to normal operation when 1.5 V > VCC < 2.5 V. The AMD6306 monitors VCC through an internal factory trimmed voltage divider, which programs the nominal reset threshold. Factory-trimmed reset thresholds are available in approximately 100 mV increments from 2.5 V to 5 V. 3 Guaranteed by design. Rev. 0 | Page 3 of 12 ADM6305/ADM6306 ABSOLUTE MAXIMUM RATINGS 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 THERMAL RESISTANCE Table 3. Package Type 5-Lead SOT-23 θJA 240 Unit °C/W ESD CAUTION Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Rev. 0 | Page 4 of 12 ADM6305/ADM6306 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS RESET 1 5 ADM6305 GND 2 RST IN1 3 TOP VIEW (Not to Scale) 3 VCC RST IN2 Figure 3. ADM6305 Pin Configuration Table 4. ADM6305 Pin Function Descriptions Pin No. 1 2 3 Mnemonic RESET GND RST IN1 Description Active Low, Open-Drain RESET Output. Ground. Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input impedance allows the use of an external resistor divider to program the monitoring threshold. Connect this pin to VCC if it is not used. Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input impedance allows the use of anexternal resistor divider to program the monitoring threshold. Connect this pin to VCC if it is not used. Power Supply Input. VCC is not monitored on ADM6305. 4 RST IN2 5 VCC RESET 1 5 ADM6306 GND 2 MR 3 TOP VIEW (Not to Scale) 3 VCC RST IN Figure 4. ADM6306 Pin Configuration Table 5. ADM6306 Pin Function Descriptions Pin No. 1 2 3 4 Mnemonic RESET GND MR RST IN Description Active Low, Open-Drain RESET Output. Ground. Manual Reset Input. Adjustable Reset Comparator Input. This pin asserts RESET if the input voltage is below threshold. Its high input impedance allows the use of an external resistor divider to program the monitoring threshold. Connect this pin to VCC if it is not used. Power Supply Input. VCC is not monitored on ADM6306. 5 VCC Rev. 0 | Page 5 of 12 09345-004 09345-003 ADM6305/ADM6306 TYPICAL PERFORMANCE CHARACTERISTICS 6.0 90 80 5.5 VCC = 4.5V 5.0 VCC = 5.5V 4.5 VCC = 2.5V 4.0 VCC = 3.5V 3.5 10 09345-005 09345-008 09345-010 1mV/1µs PROPAGATION DELAY (µs) 70 60 10mV/1µs 50 40 30 20 SUPPLY CURRENT (µA) 3.0 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) 0 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) Figure 5. Supply Current vs. Temperature 1.10 10k Figure 8. VCC Falling Propagation Delay vs. Temperature NORMALIZED RESET TIMEOUT TRANSIENT DURATION (µs) 1.05 1k 1.00 100 TRANSIENT DURATION (µs) VTH = 5V TRANSIENT DURATION (µs) VTH = 2.5V 0.95 10 0.90 09345-006 –40 –20 0 20 40 60 80 100 120 125 0 400 800 1200 TEMPERATURE (°C) OVERDRIVE, VTH – VCC (mV) Figure 6. Reset Timeout vs. Temperature 1.010 Figure 9. Maximum Transient Duration vs. VCC Reset Threshold Overdrive 120 NORMALIZED RESET THRESHOLD (V/V) 1.008 1.006 1.004 1.002 1.000 0.998 0.996 0.994 0.992 09345-007 100 PROPAGATION DELAY (µs) 1mV/1µs 80 60 10mV/1µs 40 20 0.990 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) 0 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) Figure 7. Reset Threshold vs. Temperature Figure 10. RST IN(VTH = 1.23 V) Falling Propagation Delay vs. Temperature Rev. 0 | Page 6 of 12 09345-009 0.85 1 ADM6305/ADM6306 10k 10k TRANSIENT DURATION (µs) 5V TRANSIENT DURATION (µs) 3V TRANSIENT DURATION (µs) 1k TRANSIENT DURATION (µs) 09345-011 1k 100 TRANSIENT DURATION (µs) 5V TRANSIENT DURATION (µs) 3V 100 10 10 0 200 400 600 800 1000 1200 0 100 200 300 OVERDRIVE, VREF – VRST IN (mV) OVERDRIVE, VREF – VRST IN (mV) Figure 11. Maximum Transient Duration vs. RST IN (VTH = 1.23 V) Threshold Overdrive 120 1mV/1µs 100 Figure 13. Maximum Transient Duration vs. RST INx (VTH = 0.4 V) Threshold Overdrive RST INx PROPAGATION DELAY (µs) 80 60 10mV/1µs 40 20 –40 –20 0 20 40 60 80 100 120 125 TEMPERATURE (°C) Figure 12. RST INx (VTH = 0.4 V) Falling Propagation Delay vs. Temperature 09345-012 0 Rev. 0 | Page 7 of 12 09345-013 1 1 ADM6305/ADM6306 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 1.23 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 VCC 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 VCC undervoltage threshold options for monitoring supply voltages in increments between 2.5 V to 5 V. The ADM6306 also includes a manual reset input. on this input. The ADM6305/ADM6306 are powered via VCC. Figure 9 shows the maximum transient duration vs. VCC reset threshold overdrive, for which reset pulses are not generated. Figure 9 depicts the maximum pulse width that a negative going VCC transient may typically have without causing RESET to be asserted. As the amplitude of the transient increases, the maximum allowable pulse width decreases. The addition of a bypass capacitor on VCC provides additional transient immunity. RESET OUTPUT CONFIGURATION The ADM6305/ADM6306 are available in a choice of four reset timeouts. Once the monitored supplies rise above their associated threshold level, the RESET signal remains low for the reset timeout period before deasserting. Subsequently, if a monitored supply falls below its associated threshold, the RESET output reasserts. The open-drain RESET output of the ADM6305/ADM6306 remains valid as long as VCC exceeds 0.9 V. The ADM6305 remains in UVLO when VCC is below 1.5 V. The RESET output is controlled by RTS INx if VCC exceeds 2.5 V. The open-drain RESET output allows the ADM6305 and ADM6306 to interface easily with microprocessors and devices with bidirectional reset pins. Connecting the supervisory devices RESET output directly to the microcontrollers RESET pin with a single pull-up resistor allows either device to issue a system reset (see Figure 15). INPUT CONFIGURATION The threshold voltage at an adjustable input is either 0.4 V or 1.23 V. To monitor a voltage greater than the typical adjustable threshold, VRSTH, connect a resistor divider network to the circuit as depicted in Figure 14, where R1 + R2  VTH = VRSTH     R2  VIN R1 R2 VRSTH 09345-014 VCC ADM6305/ ADM6306 RESET RPULL-UP MICROPROCESSOR 09345-015 RESET Figure 15. Interfacing to Microprocessors with Bidirectional RESET Output Figure 14. Setting the Adjustable Monitor The high input impedance (leakage of ±25 nA) of the adjustable inputs minimizes the offset error caused by the leakage current and external resistor divider. This allows the user to apply a divider with large resistance to minimize the loss. The offset voltage caused by the leakage current is calculated by R1 × ±25 nA. The RST INx inputs are designed to ignore fast voltage transients (see Figure 11 and Figure 12). Increase the noise immunity by connecting a 0.1 µF bypass capacitor between RST INx and ground. Note that adding capacitance to RST INx slows the overall response time of the device. There is no hysteresis associated with the 0.4 V adjustable inputs; instead, a time-based glitch filter to prevent false triggering is used. The glitch filter avoids the need to use a portion of the operating supply range to provide hysteresis MANUAL RESET The ADM6306 features a manual reset input (MR) which, when driven low, asserts the reset output. When MR transitions from low to high, reset remains asserted for the duration of the reset active timeout period before deasserting. The MR input has a 63.5 kΩ internal pull-up resistor so that the input is always high when unconnected. An external push-button switch can be connected between MR and ground so that the user can generate a reset. Debounce circuitry is integrated on-chip for this purpose. Noise immunity is provided on the MR input, and fast, negative-going transients of up to 0.1 µs (typical) are ignored. If required, a 0.1 μF capacitor between MR and ground provides additional noise immunity. Rev. 0 | Page 8 of 12 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 3.126 3.248 3.35 3.451 3.553 3.654 3.756 3.857 3.959 4.06 4.162 4.263 4.365 4.446 4.568 4.699 4.771 4.872 4.974 5.075 Min 2.438 2.564 2.633 2.73 2.857 2.925 3.003 3.12 3.218 3.315 3.413 3.51 3.608 3.705 3.803 3.9 3.998 4.095 4.193 4.27 4.388 4.514 4.583 4.68 4.778 4.875 TA= −40°C to +125°C Max 2.563 2.696 2.768 2.87 3 3.075 3.157 3.28 3.383 3.485 3.588 3.69 3.793 3.895 3.998 4.1 4.203 4.305 4.408 4.49 4.613 4.746 4.818 4.92 5.023 5.125 Unit V V V V V V V V V V V V V V V V V V V V V V V V V V Table 7. Reset Timeout Options Reset Timeout Period Code ADM630xD1 ADM630xD2 ADM630xD3 ADM630xD4 Min 1.0 20 140 1120 TA= −40°C to +125°C Typ Max 1.4 2.0 28 40 200 280 1570 2240 Unit ms ms ms ms Table 8. Adjustable Input Threshold Options Model ADM6305_ _ _ _ _Z-RL7 ADM6305_ _ _ _ _Z1-RL7 ADM6306_ _ _ _ _ _ _Z-R7 ADM6306_ _ _ _ _ _ _Z1-R7 RST IN1 1.23 V 0.4 V N/A N/A Monitored Input Threshold RST IN2 1.23 V 0.4 V N/A N/A RST IN N/A N/A 1.23 V 0.4 V Rev. 0 | Page 9 of 12 ADM6305/ADM6306 ADM6305D_ARJZ_-RL7 RESET TIMEOUT PERIOD CODE (1 TO 4) TEMPERATURE RANGE A: –40°C TO +125°C PACKAGE DESIGNATOR RJ = SOT-23 PACKING MATERIAL RL7 = 7” TAPE & REEL (3000 PIECE QUANTITY) RST IN1 & RST IN2 ADJUSTABLE THRESHOLD 1:0.4V & 0.4V BLANK: 1.23V & 1.23V Z = LEAD-FREE Figure 16. ADM6305 Ordering Code Structure ADM6306D_ _ _ARJZ_R7 RESET TIMEOUT (1 TO 4) RESET THRESHOLD NUMBER (SEE TABLE 6) TEMPERATURE RANGE A: –40°C TO +125°C PACKAGE DESIGNATOR RJ = SOT-23 PACKING MATERIAL R7 = 7” TAPE & REEL (3000 PIECE QUANTITY) RST IN ADJUSTABLE THRESHOLD 1:0.4V DASH: 1.23V 09345-017 Z = LEAD-FREE Figure 17. ADM6306 Ordering Code Structure Table 9. Standard Models Model RST IN1 1.23 V 0.4 V N/A N/A N/A Monitored Input Threshold RST IN2 VCC Reset 1.23 V N/A 0.4 V N/A N/A 3.08 V N/A 3.08 V N/A 3.08 V RST IN N/A N/A 1.23 V 0.4 V 1.23 V Minimum Reset Timeout 140 ms 140 ms 1 ms 1 ms 140 ms ADM6305D3ARJZ-RL7 ADM6305D3ARJZ1-RL7 ADM6306D131ARJZ-R7 ADM6306D131ARJZ1R7 ADM6306D331ARJZ-R7 Rev. 0 | Page 10 of 12 09345-016 ADM6305/ADM6306 OUTLINE DIMENSIONS 3.00 2.90 2.80 1.70 1.60 1.50 5 4 3.00 2.80 2.60 1 2 3 0.95 BSC 1.90 BSC 1.30 1.15 0.90 1.45 MAX 0.95 MIN 0.15 MAX 0.05 MIN 0.20 MAX 0.08 MIN 10° 5° 0° 0.55 0.45 0.35 121608-A 09345-019 0.50 MAX 0.35 MIN SEATING PLANE 0.20 BSC 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 PIN 1 MARKER DIRECTION OF FEED Figure 19. ADM6305/ADM6306 Reel Orientation ORDERING GUIDE Model1, 2, 3 ADM6305D3ARJZ-RL7 ADM6305D3ARJZ1-RL7 ADM6306D131ARJZ-R7 ADM6306D331ARJZ-R7 ADM6306D131ARJZ1R7 1 2 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C Ordering Quantity4 3,000 3,000 3,000 3,000 3,000 Package Description 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 Package Option RJ-5 RJ-5 RJ-5 RJ-5 RJ-5 Branding LG9 LG8 LGA LG6 LGC ADM6305 and ADM6306 follow the C2 Pin 1 orientation standard for tape and reel packaging (see Figure 19). If ordering nonstandard models, complete the ordering code shown in Figure 16 and Figure 17 by inserting the reset threshold, reset timeout, and adjustable threshold suffixes. Contact Sales for availability of nonstandard models, quoting ADM6305-NTSD or ADM6306-NTSD first, and then the complete ordering code. 3 Z = RoHS Compliant Part. 4 A minimum of 10,000 must be ordered for nonstandard models. Rev. 0 | Page 11 of 12 ADM6305/ADM6306 NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09345-0-10/10(0) Rev. 0 | Page 12 of 12