IMP811 A1PROS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
  • PDF pages: 8

Technical content

Applications

4-Pin 4-Pin µµP VP V oltolt agag e Supere Super visor visor witwit h Manual Rh Manual R eseteset u Computers and controllers u Embedded controllers u Battery operated systems u Intelligent instruments u Wireless communication systems u PDAs and handheld equipment u Improved Maxim MAX811/MAX812 replacement — Specified to 105°C — New 4.0V threshold option u 6mA supply current u Monitor 5V , 3.3V and 3V supplies u Manual reset input u 140ms min. reset pulse width u Guaranteed over temperature u Active-LOW reset valid with 1.1V supply (IMP811) u Small 4-pin SOT-143 package u No external components u Power-supply transient-immune design Block Diagrams IMP811 (IMP812) VCC VCC VCC GND GND RESET (RESET) Manual Reset MR 811/12_01.eps µC or µP RESET Input The IMP811/IMP812 are low-power supervisors designed to monitor voltage levels of 3.0V , 3.3V and 5.0V power supplies in low-power microprocessor (µP), microcontroller (µC) and digital systems. Each fea- tures a debounced manual reset input. The IMP811/812 are improved drop-in replacements for the Maxim MAX811/812 with extended temperature specifications to 105°C. A reset signal is issued if the power supply voltage drops below a preset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. The IMP811 has an active-low output RESET that is guaranteed to be in the correct state for V CC down to 1.1V . The IMP812 has an active-high output RESET. The reset comparator is designed to ignore fast transients on V CC . Low power consumption makes the IMP811/IMP812 ideal for use in portable and battery-operated equipment. Available in a compact 4-pin SOT143 package, the devices use minimal board space. Six voltage thresholds are available to support 3V to 5V systems: IMP8IMP8 1111, IMP8, IMP8 1122 POWER MANAGEMENT Reset Threshold Suffix Voltage (V) L 4.63 M 4.38 J 4.00 T 3.08 S 2.93 R 2.63 IMP , Inc. San Jose, CA 408-432-9100/www.impweb.com

IMP8IMP8 1111, IMP8, IMP8 1122

Ordering Information

(IMP812) GND (RESET) RESET VCC4 MR32 811/12_02.eps SOT143 Package Marking2 Part Number 1 Reset Threshold (V) Temperature Range Pin-Package (XX Lot Code) IMP811 Active LOW Reset with Active LOW Manual Reset IMP811LEUS-T 4.63 –40°C to +105°C 4-SOT143 AMXX IMP811MEUS-T 4.38 –40°C to +105°C 4-SOT143 ANXX IMP811JEUS-T 4.00 –40°C to +105°C 4-SOT143 AOXX IMP811TEUS-T 3.08 –40°C to +105°C 4-SOT143 APXX IMP811SEUS-T 2.93 –40°C to +105°C 4-SOT143 AQXX IMP811REUS-T 2.63 –40°C to +105°C 4-SOT143 ARXX IMP812 Active HIGH Reset with Active LOW Manual Reset IMP812LEUS-T 4.63 –40°C to +105°C 4-SOT143 ASXX IMP812MEUS-T 4.38 –40°C to +105°C 4-SOT143 ATXX IMP812JEUS-T 4.00 –40°C to +105°C 4-SOT143 AUXX IMP812TEUS-T 3.08 –40°C to +105°C 4-SOT143 AVXX IMP812SEUS-T 2.93 –40°C to +105°C 4-SOT143 AWXX IMP812REUS-T 2.63 –40°C to +105°C 4-SOT143 AXXX Pin Terminal Voltage with Respect to Ground (Derate SOT-143 4mW/° C above 70°C) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability Notes: 1. Tape and Reel packaging is indicated by the -T designation. 2. Devices may also be marked with full part number: 81 1L, 812M etc. XX refers to lot. Absolute Maximum Ratings

IMP8IMP8 1111, IMP8, IMP8 1122 Parameter Symbol Conditions Min Typ Max Units Input Voltage (VCC ) Range VCC TA = 0°C to 70°C 1.1 5.5 V TA = –40°C to 105°C 1.2 5.5 Supply Current (Unloaded) ICC TA = –40°C to 85°C VCC < 5.5V, L/M/J 6 15 µA TA = –40°C to 85°C VCC < 3.6V, R/S/T 5 10 TA = 85°C to 105°C VCC < 5.5V, L/M/J 25 TA = 85°C to 105°C VCC < 3.6V, R/S/T 20 Reset Threshold VTH L devices TA = 25°C 4.56 4.63 4.70 V TA = –40°C to 85°C 4.50 4.75 TA = 85°C to 105°C 4.40 4.86 M devices TA = 25°C 4.31 4.38 4.45 TA = –40°C to 85°C 4.25 4.50 TA = 85°C to 105°C 4.16 4.56 J devices TA = 25°C 3.93 4.00 4.06 TA = –40°C to 85°C 3.89 4.10 TA = 85°C to 105°C 3.80 4.20 T devices TA = 25°C 3.04 3.08 3.11 TA = –40°C to 85°C 3.00 3.15 TA = 85°C to 105°C 2.92 3.23 S devices TA = 25°C 2.89 2.93 2.96 TA = –40°C to 85°C 2.85 3.00 TA = 85°C to 105°C 2.78 3.08 R devices TA = 25°C 2.59 2.63 2.66 TA = –40°C to 85°C 2.55 2.70 TA = 85°C to 105°C 2.50 2.76 Reset Threshold Temp. Coefficient TC VTH 30 ppm/°C VCC to Reset Delay VCC = VTH to (VTH - 125mV), L/M/J devices 40 µs VCC = VTH to (VTH - 125mV), R/S/Tdevices 20 Reset Active Timeout Period VOL TA = 0°C to 70°C 140 560 ms TA = –40°C to 105°C 100 840 MR Minimum Pulse Width tMR 10 µs MR Glitch Immunity Note 3 100 ns MR to RESET Propagation Delay tMD Note 2 0.5 µs MR Input Threshold VIH VCC > VTH (MAX), IMP811/812L/M/J 2.3 V VIL 0.8 VIH VCC > VTH (MAX), IMP811/812R/S/T 0.7VCC VIL 0.25VCC MR Pull-up Resistance 10 20 30 kΩ Low RESET Output Voltage (IMP811) VOL VCC = VTH min., ISINK = 1.2mA, IMP811R/S/T 0.3 V VCC = VTH min., ISINK = 3.2mA, IMP811L/M/J 0.4 VCC > 1.1V, ISINK = 50µA 0.3 High RESET Output Voltage (IMP811) VOH VCC > VTH max., ISOURCE = 500µA, IMP811R/S/T 0.8VCC V VCC > VTH max., ISOURCE = 800µA, IMP811L/M/J VCC -1.5 Low RESET Output Voltage (IMP812) VOL VCC = VTH max., ISINK = 1.2mA, IMP812R/S/T 0.3 V VCC = VTH max., ISINK = 3.2mA, IMP812L/M/J 0.4 High RESET Output Voltage (IMP812) VOH 1.8V < VCC < VTH min., ISOURCE = 150µA 0.8VCC V

Electrical Characteristics

Unless otherwise noted VCC is over the full voltage range, T A = –40° C to 105° C. Typical values at TA = 25° C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices. Notes: 1. Production testing done at TA = 25° C. Over temperature specifications guaranteed by design only using six sigma design limits. 2.‘R‘E‘S‘E‘T output is active LOW for the IMP811 and RESET output is active HIGH for the IMP812. 3. Glitches of 100ns or less typically will not generate a r eset pulse.

IMP8IMP8 1111, IMP8, IMP8 1122 Pin Descriptions Pin Number Name Function

1 GND Ground

2 RESET RESET is asserted LOW if VCC falls below the reset threshold and remains LOW for the

(IMP811) 140ms minimum after the reset conditions are removed. In addition, RESETis active LOW as long as the manual reset is low.

2 RESET RESET is asserted HIGH if VCC falls below the reset threshold and remains HIGH for the

(IMP812) 140ms minimum after the reset conditions are removed. In addition, RESETis active HIGH as long as the manual reset is low. 3 MR Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains active as long as MR is LOW and for 180ms after MR returns HIGH. The active low input has an internal 20kΩ pull-up resistor. The input should be left open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a switch.. 4 VCC Power supply input voltage (3.0V, 3.3V, 5.0V)

Related Products

IMP809 IMP810 IMP811 IMP812 Max. Supply Current 15µA 15µA 15µA 15µA Package Pins 3 3 4 4 Manual RESET input n n Package Type SOT -23 SOT -23 SOT -143 SOT -143 Active-HIGH RESEToutput n n Active-LOW RESET output n n

has risen above the threshold. collector/drain outputs. MR can be left open if not used. ground without an external debounce circuit. Figure 1. Reset Timing and Manual Reset (MR)

IMP8IMP8 1111, IMP8, IMP8 1122 RESET Output Operation In µP/µC systems it is important to have the pr ocessor begin operation from a known state or be able to return the system to a known state. A RESET output to a pr ocessor is provided to pre- vent improper operation during power supply sequencing or low voltage – brownout – conditions. The IMP811/812 are designed to monitor the system power sup - ply voltages and issue a RESET signal when levels ar e out of range. RESET outputs ar e guaranteed to be active for VCC above 1.1V. When VCC exceeds the r eset thr eshold, an internal timer keeps RESET active for the r eset timeout period, after which RESET becomes inactive (HIGH for the IMP811 and LOW for the IMP812). Valid Reset with VCC under 1.1V To ensure that logic inputs connected to the IMP81 1 RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pull-down resistor at RESET is needed. The value is not critical. A similar pull-up resistor to VCC is needed with the IMP812. Negative VCC Transients Typically short duration transients of 100mV amplitude and 20µs duration do not cause a false RESET . A 0.1µF capacitor at VCC increases transient immunity. Power Supply IMP811 VCC GND RESETMR 100kΩ 811/12_04.eps Power Supply IMP812 VCC GND RESETMR 100kΩ 811/12_05.eps

Application Information

Suffix Voltage (V) L 4.63 M 4.38 J 4.00 T 3.08 S 2.93 R 2.63 Figure 2. RESET Valid with VCC Under 1.1V Figure 3. RESET Valid with VCC Under 1.1V ator can initiate this condition using the Manual Reset (MR) pin.

reset output and the µP/µC bi-directional reset pin. Figure 4. Bi-directional Reset Pin Interface

IMP8IMP8 1111, IMP8, IMP8 1122 IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Tel: 800-438-3722 Fax: 408-434-0335 Fax-on-Demand: 1-800-249-1614 (USA) Fax-on-Demand: 1-303-575-6156 (International) e-mail: info@impinc.com http://www.impweb.com The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. © 1998 IMP, Inc. Printed in USA Preliminary Part No.: IMP811-812 Document Number: IMP811-6-6/98