G684L438T1U

Global Mixed-mode Technology Inc. G684/G685 Microprocessor Reset IC Features Precision Monitoring of +3V, +3.3V, and +5V Power-Supply Voltages General Description The G684/G685 are microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. They provide excellent circuit reliability and low cost and adjustments when used with +5V, +3.3V, +3.0V- powered circuits. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below a preset threshold, with hysteresis after VCC has risen above the reset threshold. Reset thresholds suitable for operation with a variety of supply voltages are available. The G685 has an open-drain output stage, while the G684 have push-pull outputs. The G685L’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G684L have an active-low RESET output, while the G684H has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC down to 0.8V. Low supply current makes the G684/G685 ideal for use in portable equipment. The G684/G685 are available in 5-pin SOT23-5 packages. Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output (G684L) Push-Pull RESET Output (G684H) Open-Drain RESET Output (G685L) 14µA Supply Current Guaranteed Reset Valid to VCC = 0.8V Power Supply Transient Immunity 5 pin SOT23-5 Packages 2% Threshold Accuracy Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive Ordering Information ORDER NUMBER TEMP. RANGE G684H(L)xxxT1U G685LxxxT1U -40°C ~ +105°C -40°C ~ +105°C PACKAGE SOT23-5 SOT23-5 Note: T1 : SOT23-5 U : Tape & Reel * xxx specifies the threshold voltage. e.g. 263 denotes the 2.63V threshold voltage. Pin Configuration 1 5 Typical Application Circuit VCC N.C. VCC VCC Rpull-up* VCC GND 2 G684/G685 G684/G685 RESET (RESET) µP RESET INPUT GND GND 3 SOT23-5 SOT23-5 4 RESET (RESET) GND ()is for G684H *G685 ONLY Ver: 1.2 Jun 03, 2004 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. Absolute Maximum Ratings Terminal Voltage (with respect to GND) VCC.……………………………..…….…….-0.3V to +6.0V Delay Capacitor Pin Voltage, VCD…..-0.3 to (VCC +0.3V) RESET, RESET (push-pull)....…....-0.3V to (VCC + 0.3V) RESET (open drain)...…......…................-0.3V to +6.0V Input Current, VCC ............................…..…............20mA Output Current, RESET, RESET ......…...............20mA G684/G685 Continuous Power Dissipation (TA = +70°C) 5-Pin SOT23-5 (derate 2.17mW/°C above +70°C).174mW Operating Temperature Range …...…..-40°C to +105°C Storage Temperature Range..….…......-65°C to +150°C Lead Temperature (soldering, 10s)...…...….…...+260°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (VCC = full range, TA = -40°C to +105°C, unless otherwise noted. Typical values are at TA = +25°C, VCC = 5V for 463/438/400/330 versions, VCC= 3.3V for 308/293 versions, and VCC = 3V for 263 version.) (Note 1) PARAMETER VCC Range Supply Current (SOT23-5) ICC SYMBOL CONDITION TA = 0°C +70°C TA = -40°C +105°C VCC