XC6121/XC6122 XC6123/XC6124 Series ETR0209-011b Voltage Detector with Watchdog Function and ON/OFF Control (V =1.6V~5.0V) DF GENERAL DESCRIPTION The XC6121/XC6122/XC6123/XC6124 series is a group of high-precision, low current consumption voltage detectors with watchdog functions incorporating CMOS process technology. The series consist of a reference voltage source, delay circuit, comparator, and output driver. With the built-in delay circuit, the series do not require any external components to output signals with release delay time. The output type is VDFL low when detected. The EN/ENB pin can control ON and OFF of the watchdog functions. By setting the EN/ENB pin to low or high level, the watchdog function can be OFF while the voltage detector remains operation. Since the EN/ENB pin of the XC6122 and XC6124 series is internally pulled up to the VIN pin or pulled down to the VSS pin, these series can be used with the EN/ENB pin left open when the watchdog functions is used. The detect voltages are internally fixed 1.6V ~ 5.0V in increments of 0.1V, using laser trimming technology. Six watchdog timeout periods are available in a range from 50ms to 1.6s. Five release delay times are available in a range from 3.13ms to 400ms. APPLICATIONS FEATURES Detect Voltage Range : 1.6V ~ 5.0V, +2% Microprocessor watchdog monitoring (0.1V increments) and reset circuits Hysteresis Width : VDFL x 5% (TYP.) Operating Voltage Range : 1.0V ~ 6.0V Memory battery backup circuits Detect Voltage Temperature System power-on reset circuits O Characteristics : +100ppm/ C (TYP.) Output Configuration : N-channel open drain Power failure detection Watchdog Pin : Watchdog input If watchdog input maintains H or L within the watchdog timeout period, a reset signal is output from the RESETB pin. EN/ENB Pin : When the EN/ENB pin voltage is set to low or high level, the watchdog function is forced off. Release Delay Time : 400ms, 200ms, 100ms, 50ms, 3.13ms (TYP.) Watchdog Timeout Period : 1.6s, 800ms, 400ms, 200ms, 100ms, 50ms (TYP.) Operating Ambient Temperature : -40~ +85 Packages : SOT-25, USP-6C Environmentally Friendly : EU RoHS Compliant, Pb Free TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs. Input Voltage (VDF=. 14.0 Ta=85 12.0 10.0 8.0 Ta=25 Ta=-40 6.0 4.0 2.0 0 01 23 4 5 6 Input Voltage:V (V) IN 1/26 Supply Current:I SS (A) XC6121/XC6122/XC6123/XC6124 Series PIN CONFIGURATION USP-6C SOT-25 (BOTTOM VIEW) (TOP VIEW) * The dissipation pad for the USP-6C package should be solder-plated in reference mount pattern and metal masking so as to enhance mounting strength and heat release. If the pad needs to be connected to other pins, it should be connected to the VSS (No. 5) pin. PIN ASSIGNMENT PIN NUMBER PIN NAME FUNCTION SOT-25 USP-6C RESETB Reset Output 1 4 VSS Ground 2 5 3 2 EN/ENB Watchdog ON/OFF Control 4 1 WD Watchdog 5 6 VIN Power Input - 3 NC No Connection 2/26