IMP1834

IMP1834 IMP | Alldatasheet

Document overview

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Technical content

© 1999 IMP , Inc. 408-432-9100/www.impweb.com 1 Key Features u Lower power, pin-compatible replacements for the Dallas DS1834 — 40% lower maximum supply current: 30µA vs 50µA u Monitor 5V and 3.3V supplies simultaneously u 5V and 3.3V power-on reset u 350ms reset time u Debounced pushbutton reset input u Push-Pull CMOS output — IMP1834, IMP1834D — Eliminates external pull-up resistors — Active LOW (IMP1834), HIGH (IMP1834D) u Open drain output — IMP1834A — Active LOW u Selectable 5V and 3.3V trip point tolerance u Internal power drawn from highest input voltage, 5V or 3.3V u Precision temperature-compensated voltage reference and comparator u Low-cost surface mount SO, compact MicroSO and DIP packages u Wide operating temperature, –40 °C to +85°C Block Diagram 3.3VIN 1834_01.eps 40kΩ 5VIN 5VTOL 5V Tolerance Bias IMP1834 PBRST Low TC Reference 3.3VTOL GND 4 5VRESET 5VRESET (IMP1834D) For IMP1834D 350 ms Delay For IMP1834D 3.3V Tolerance Bias + 3.3VRESET 3.3VRESET (IMP1834D) 350 ms Delay Pushbutton Level Sense and Debounce IMP1IMP1 8383 4/A/D4/A/D POWER MANAGEMENT Dual 5V and 3.3V Dual 5V and 3.3V mmP PP Poowwer er SupplSupply Supery Supervisorvisors w/Manual Rs w/Manual Reseteset – Push-Pull and Open-Dr– Push-Pull and Open-Dr ain Outputsain Outputs – Select– Select able Table T rrip Pip P oint Toint T oleroler anceance The IMP1834 supervisors simultaneously monitor both 3.3V and 5V power sources and issue reset signals when either supply is out of toler- ance. When an out-of-tolerance condition is detected, the output-reset signal of the affected supply becomes active and resets the system micro- processor/microcontroller. On power-up and after the supply voltage returns to an in-tolerance condition, the reset signal remains active for approximately 350ms. This allows the power supply and system micro- processor to stabilize. The IMP1834 supervisors are pin-compatible with devices from Dallas Semiconductor and require up to 40% less current. Tolerance levels are independently selectable for both supplies. Tolerance options are 5- and 10-percent for the 5V supply and for the 3.3V supply, 10- and 20-percent. The IMP1834 and IMP1834D have push-pull reset output stages. The IMP1834A active LOW reset outputs are open drain devices that can both be connected to either 5 volt or 3.3 volt supply. The IMP1834 and IMP1834A have active LOW reset outputs. The IMP1834D has active HIGH reset outputs. All devices can issue reset signals through an internally debounced pushbutton reset input that affects both reset outputs. All devices operate over the extended industrial temperature range. Devices are available in 8-pin DIP , surface mount 8-pin SO and 8-pin MicroSO packages. Die are also available. 1834_02.eps 5VRESET2 3.3VRESET7 IMP1834A

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2 TESERV5

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Ordering Information

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© 1999 IMP , Inc. 408-432-9100/www.impweb.com 3 IMP1IMP1 8383 4/A/D4/A/D Absolute Maximum Ratings

Electrical Characteristics

(IMP1834, IMP1834D) (IMP1834, IMP1834D) Voltage on PBRST and reset outputs . . –0.5V to the greater of 5VIN +0.5V or 3.3VIN +0.5V (IMP1834A) Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Parameter Symbol Conditions Min Typ Max Units 5V Supply Voltage (5VIN)5 V IN 1.2 5.5 V PBRST Input High Level V IH Both 3.3VIN and 5VIN ‡ 2.7V 2 V INMAX +0.3V V PBRST Input High Level V IH Both 3.3VIN and 5VIN £ 2.7V V INMAX –0.4V V PBRST Input Low Level V IL –0.3 0.5 V Recommended DC operating condition over the operating temperature range of –40 °C to +85°C. All voltages are referenced to ground. Parameter Symbol Conditions Min Typ Max Units Output Voltage V OH VIN – 0.1V V Input Leakage I IL –1.0 +1.0 mA Output Current I OH Output = 2.4V. Either 3.3VIN or 350 mA 5VIN ‡ 2.7V. (IMP1834/1834D only) Output Current I OL Output = 0.4V. Either 3.3VIN or +10 mA 5VIN ‡ 2.7V. (IMP1834/1834D only) 5V Operating Current I CC 3.3VIN and 5VIN £ 5.5V, 16 30 mA RESET outputs open. 3.3V Operating Current I CC 3.3VIN and 5VIN £ 3.6V, 12 25 mA RESET outputs open. 5V Trip Point V INTP 5VTOL = GND 4.50 4.63 4.75 V 5V Trip Point V INTP 5VTOL = 5VIN 4.25 4.38 4.49 V Output Capacitance C OUT 10 pF PBRST Manual Reset t PB 2m s Minimum Low Time PBRST Stable LOW to t PDLY 2m s Reset Active Reset Active Time t RST 200 350 500 ms VCC Detect Noise Immunity t RPD 2 ms VCC Slew Rate t F VINTP (MAX) to VINTP (MIN) 300 ms VCC Slew Rate t R VINTP (MIN) to VINTP (MAX) 0 ns VCC Detect to RESET or RESET t RPU trise= 5ms 200 350 500 ms Unless otherwise noted, VIN = 1.2V to 5.5V and specifications are over the operating temperature range of –40 °C to +85°C.

L 0°– 8° C HE e D B A1 A SO (8-Pin).eps SO (8-Pin) Plastic DIP (8-Pin) IMP1IMP1 8383 4/A/D4/A/D Absolute Maximum Ratings © 1999 IMP, Inc. 408-432-9100/www.impweb.com 7 Package Dimensions E D eA eB C 0°–15° A e b2 b L A1 Plastic DIP (8-Pin)a.eps MicroSO (8-Pin) e b D E1 E a L C D 0.10mm 0.004in A MicroSO (8-Pin).eps sehcnI sretemilliM niM xaM niM xaM *)niP-8(OSorciM 1A 0200.0 9500.0 050.0 51.0 2A 5920.0 4730.0 57.0 59.0 b 8900.0 7510.0 52.0 04.0 C 1500.0 1900.0 31.0 32.0 D 2411.0 0221.0 09.2 01.3 e CSB6520.0 CSB56.0 E CSB391.0 CSB09.4 1E 2411.0 0221.0 09.2 01.3 L 7510.0 6720.0 04.0 07.0 a °0 °6 °0 °6 )niP-8(OS A 350.0 960.0 53.1 57.1 1A 400.0 010.0 01.0 52.0 B 310.0 020.0 33.0 15.0 C 700.0 010.0 91.0 52.0 e 050.0 72.1 E 051.0 751.0 08.3 00.4 H 822.0 442.0 08.5 02.6 L 610.0 050.0 04.0 72.1 D 981.0 791.0 08.4 00.2 *)niP-8(PIDcitsalP 2A 511.0 591.0 29.2 59.4 b 410.0 220.0 63.0 65.0 2b 540.0 070.0 41.1 87.1 3b 030.0 540.0 08.0 41.1 D 553.0 004.0 20.9 61.01 E 003.0 523.0 26.7 62.8 1E 042.0 082.0 01.6 11.7 L 511.0 051.0 29.2 18.3 ** AA781-OMgniwarDCEDEJ* * AA211-SMgniwarDCEDEJ AB100-SMgniwarDCEDEJ* 3ta.40t_4381

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. © 1999 IMP, Inc. Printed in USA Publication #:1009 Revision: A Issue Date: 07/02/99 Type: Preliminary