AMS810XTE

AMS803 AMS | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 8

Technical content

Features

z Precision supply-voltage monitor z 140ms(min) reset pulse width z Push-Pull /RESET Output Configurations for AMS809 z Push-Pull RESET Output Configurations for AMS810 z Open-Drain /RESET output configuration for AMS803 z 12µA Supply Current z Guaranteed Reset(/Reset) Valid to VCC = +1.0V z Power Supply Transient Immunity z No External Components

Ordering Information

AMS803XTE Lead free and Green SOT23-3 AMS809XTE Lead free and Green SOT23-3 AMS810XTE Lead free and Green SOT23-3 Note: “x” refers to voltage range, see below table.

Description

The AMS803/09/10 ar e microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +3.3V, +3.0V, or 2.5V powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The AMS803 has an open-drain output stage, while the AMS809/10 have push-pull outputs. The AMS803’s open-drain /Reset output requires a pull-up resistor that can be connected to a voltage higher than V CC. The AMS803/09 have an active-low /RESET output while the AMS810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on V CC, and the outputs are guaranteed to be in the correct logic state for VCC down to 1V. Low supply current makes the AMS803/09/10 ideal for use in portable equipment. The ICs are available in 3 pin SOT23 packages. Suffix: X—Monitored Voltage X L M T S R Z Block Diagram RESET Reset Logic and Timer VCC + VRST

Supply Voltage. Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout Period (tRS) once VCC rises above VRST. GND - Ground RESET O Active-Low Reset Output (Push-Pull). It goes low when Vcc is below the reset threshold. It remains low for about 200ms after Vcc rises above the reset threshold (VRST). Functional Description Reset Output A microprocessor ( µP) reset input starts the µP in a known state. Whenever the µP is in an unknown state, it should be held in reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout conditions. On power-up, once Vcc reaches about 1.0V, /RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, /RESET stays low. When Vcc rises above the reset threshold, an internal timer releases /RESET after about 200ms. /RESET pulses low whenever Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, guaranteed to be 0.4V or less until Vcc drops below 1.0V. Reset Timing Diagram shows the timing relationship. VCC GND RESET SOT23-3 AMS803/09/10XT

Typical Application Circuit

Recommended Operation Conditions Sym Description Test Conditions Min Typ Max Unit Supply Voltage for 803/09/10(L/M) - 4.5 5.0 5.5 V Supply Voltage for 803/09/10(T/S) - 3.0 3.3 5.5 V VCC Supply Voltage for 803/09/10(R/Z) - 2.7 3.0 5.5 V TA Operating Temperature - -40 - 85 ¥ Note: Stresses greater than those listed under 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 condi- tions above those indicated in the operational sec- tions of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.

(VCC = VRN + 5% to 5.5V, TA= -40~85ºC, unless otherwise noted.)(Note 1) Symbol Description Test Conditions Min Typ Max Unit VCC Operating Voltage Range - 1.0 - 5.5 V ICC Supply Current Vcc < 5.5V , AMS8xxL/M - 10 30 ICC Supply Current Vcc < 3.6V, AMS8xxR/S /T/Z - 10 30 µA AMS809M VRN -1.1% V RN V RN +1.1% TA= 25ºC All except 809M VRN - 1.5% VRN V RN + 1.5% TA= -40 ~ 85ºC AMS809M VRN - 1.8% VRN V RN + 2% VRST čVRTHĒ) Threshold Voltage(Falling- edge)(Note 2) T A= -40 ~ 85ºC All except 809M VRN - 2.5% VRN V RN + 2.5% V VRTHĐ Threshold Voltage(Rising- edge) (Note 2) T A= -40 ~ 85ºC AMS809M 4.232 4.31 4.396 VRTH Reset Threshold Hysteresis (Note 2) Vcc varies between V RN ± 5% (Only for 8xxL/M) - 50 - mV Vcc ≥ 4.5V Isource=800µA Vcc-1.5 - - Vcc ≥ 2.7V Isource=500µA 0.8×Vcc - - Vcc ≥ 1.8V Isource=150µA 0.8×Vcc - - VOH Output High Voltage Vcc ≥ 1.0V Isource=4µA 0.8×Vcc - - V Vcc ≥ 4.5V Isink=3.2mA - - 0.4 Vcc ≥ 2.7V Isink=1.2mA - - 0.3 VOL Output Low Voltage Vcc ≥ 1.0V Isink=100µA - - 0.3 V Note: 1. Parameters of room temperature guaranteed by production test and parameters of full-temperature guaranteed by design. 2. VRST is Reset threshold voltage when VCC falls from high to low level. VRN is nominal reset threshold voltage. Symbol Description Test Co nditions Min Typ Max Unit - 8xxT/S/R/Z 140 240 560 tRS Reset Pulse Width TA= 25ºC 8xxL/M 140 200 280 ms Reset Timing Diagram VCC tRS RESET VRST VRST + VRTH

TE (Lead free and Green SOT23-3) X. XX X. XX DENOTES DIMENSIONS IN MILLIMETERS Note: 1) Controlling dimensions in millimeters. 2) Ref: JEDEC TO-236H

Example: AAPJ PART NO.: AMS809LT AAPJ PART NO.: AMS809LTE DATE CODE: YEAR 2005 WW10 DATE CODE: YEAR 2005 WW10 Lead –free package

1 AMS809L AA 7 AMS803L BC 13 AMS810L AH

2 AMS809M AB 8 AMS803M BD 14 AMS810M AI

3 AMS809T AC 9 AMS803T BE 15 AMS810T AJ

4 AMS809S AD 10 AMS803S BF 16 AMS810S AK

5 AMS809R AE 11 AMS803R BG 17 AMS810R AL

6 AMS809Z AF 12 AMS803Z BH 18 AMS810Z AM

PART NO.

2 BIT CODE

(See Below Table) DATE CODE YEAR & WORK WEEK Lead-Free Sign -: lead-free

Disclaimer:

• AMS reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! Customers should obtain the latest relevant information before placing orders and should verify that such information is complete and current.
• All semiconductor prod ucts malfunction or fail with some probability under special conditions. When using AMS products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such AMS products could cause loss of body injury or damage to property.
• AMS will supply the best possible product for customers!