ADVANCE INFORMATION, COMPANY CONFIDENTIAL PI4S809/803 P Supervisor Circuits Features Description * The PI4Sxxx family microprocessor (P) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in P systems. These devices reduce the complexity and number of components required to monitor power-supply and battery functions. Precision supply-voltage monitor - 4.63V (PI4S8xxL) - 4.38V (PI4S8xxM) - 3.08V (PI4S8xxT) - 2.93V (PI4S8xxS) - 2.63V (PI4S8xxR) - 2.32V (PI4S8xxZ) - 2.20V (PI4S8xxY) The main functions are: * Asserting reset output during power-p, power-down and brownout conditions for P systems. * 200ms reset pulse width * Reset Output Signal for Watchog and Power Abnormal, Manual Reset * Reset Push-Pull output (PI4S809) * Voltage monitor for power-fail or low battery warning * Guaranteed RESET/RESET valid at VCC = 1.2V * Packaging: 3-pin SOT-23 * Detecting power failure or low-battery conditions with a 1.25V threshold detector. * Watchdog functions. * Manual reset. Applications * Power-supply circuitry in P systems. Block Diagram VCC Reset Generator 200ms RESET VREF GND Pin Configuration GND 1 2 RESET VCC 3 PI74S803 PI74S809 1 P-0.2 02/24/05 ADVANCE INFORMATION, COMPANY CONFIDENTIAL PI4S809/803 P Supervisor Circuits Pin Description (Table 2.) Pin Name VCC Type Power GND RESET Ground O Description Power Supply: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains asserted until VCC rises abouv VRES and keep asserted for the duration for the Reset Timeout Period (tRS) once VCC rises above (VRST). Ground Reference for all signals Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when VCC is below the reset threshold. It remains low for about 200ms after one of the following occurs: VCC rises above the reset threshold (VRST), the watchdog triggers a reset, or MR goes from low to high. Functional Description Reset Output A microprocessor (P) reset input starts the P in a known state. Whenever the P 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, the pulse continues for at least another 200ms. On power-down, once VCC falls below the reset threshold, RESET stays low and is guaranteed to be 0.4V or less until VCC drops below 1.0V. Figure 4 shows the timing relationship. The active-high RESET output is simply the inverse of the RESET output, and is guaranteed to be valid with VCC down to 1.0V. Absolute Maximum Ratings Storage Temperature ......................................................... -65oC to +150oC Ambient Temperature with Power Applied ........................ -40oC to +85oC Supply Voltage to Ground Potential (VCC to GND) ............ -0.3V to +7.0V DC Input Voltage (All inputs except VCC and GND) .............-0.3V to VCC+0.3V DC Output Current (All outputs) ........................................................20mA Power Dissipation (Depends on package) ..................................... 320mW 2 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 conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. P-0.2 02/24/05 ADVANCE INFORMATION, COMPANY CONFIDENTIAL PI4S809/803 P Supervisor Circuits DC Electrical Characteristics (Table 3) Symbol VCC Description Min Typ Supply Voltage for xxxL, xxxM 4.5 5.0 Supply Voltage for xxxT, xxxS 3.0 3.3 Supply Voltage for xxxR 2.7 3.0 Supply Voltage for xxxZ, xxxY 2.4 2.5 VIH Input High Voltage VIL Input Low Voltage TA Operating Temperature Test Conditions Max Unit 5.5 V 0.7VCC 0.3VCC -40 85 C DC Electrical Characteristics (Table 4) Symbol Description VCC Operating Voltage Range ICC Supply Current VIH Input High Voltage VIL Input Low Voltage Test Conditions Min VCC = 5V No Load Reset Threshold Voltage* TA = -40~85C VRTH Reset Threshold Hysteresis* Output High Voltage Unit 5.5 V 6 18 uA V 0.3xVcc V VRN-1% VRN VRN+1% V VRN-2.5% VRN VRN+2.5% V xxxL 4.514 4.63 4.746 xxxM 4.271 4.38 4.490 xxxT 3.003 3.08 3.157 xxxS 2.857 2.93 3.003 xxxR 2.564 2.63 2.696 xxxZ 2.262 2.32 2.378 xxxY 2.145 2.20 2.255 VCC varries between VRN 5% VCC 4.5V Isource=800uA VOH Typ 0.7xVCC TA = 25C VRST Max 1.0 V 50 mV VCC-1.5 VCC 2.7V Isource=500uA VCC 1.8V Isource=150uA V 0.8xVCC VCC 1.0V Isource=40uA VOL Output Low Voltage VCC 4.5V Isink=3.2mA 0.4 VCC 2.7V Isink=1.2mA 0.3 VCC 1.0V Isink=100uA 0.3 1 uA 1.3 V 25 nA ILKG Open-Drain Ouput Leakage Current VCC > VTH(MAX) for PI4S803 VPFT PFI Input Threshold VPFI varies from 1.5V and 1.0V IPFI PFI Input Leakage Current 3 1.2 1.25 V P-0.2 02/24/05 ADVANCE INFORMATION, COMPANY CONFIDENTIAL PI4S809/803 P Supervisor Circuits AC Electrical Characteristics Symbol Description Test Conditions Min Typ Max Units tRS Reset Pulse Width MR from low to High 140 200 280 ms tWD Watchdog Timeout Period WDI and MR tied to VCC 1.12 1.6 2.25 s tMR MR Pulse Width tMD MR to RESET Output Delay tWP WDI Pulse Width 1 s VCC = 5.0V 250 ns 50 ns Watchdog Timing Diagram VCC VRST VRST tRS tWD tRS tRS RESET RESET tWP WDI tMD tMR MR 4 P-0.2 02/24/05 ADVANCE INFORMATION, COMPANY CONFIDENTIAL PI4S809/803 P Supervisor Circuits Packaging Mechanical: 3-pin SOT-23 1.80 2.00 0.45 0.60 2.20 2.64 1.20 1.40 0.55 0.38 0.51 0.95 0-8 o 2.80 3.04 0.09 0.18 0.90 1.12 0.013 0.102 X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS Note: 1) Controlling dimensions in millimeters. 2) Ref: JDDEC TO-236AB Marking Information 1 2 3 4 CODE DESCRIPTION 12 3 4 Part Number Year Work Week Code 1 2 AA AB AC AD AE AF AG Part Number Code Part No. Code 1 2 PI4S809L BC PI4S809M BD PI4S809T BE PI4S809S BF PI4S809R BG PI4S809Z BH PI4S809Y BI Part No. PI4S803L PI4S803M PI4S803T PI4S803S PI4S803R PI4S803Z PI4S803Y Ordering Information Ordering Code Package Code Package Description PI4S809xW PI4S803xW W W 3-pin, SOT-23 3-pin, SOT-23 Notes: 1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/ Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 5 P-0.2 02/24/05