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Technical content

Features

 Precise Detection Threshold：±2%  Low Power Consumption：4uA(VCC=3.7V）  Operating Voltage Range：1.15V to 5.5V  Guaranteed Output Valid to VCC = +1.15V  CMOS Output and Open Drain Output  Power Supply Transient Immunity  Operating Temperature Range： －40°C to +85°C  Available in SOT23-3 Pin Assignment

www.consonance-elec.com 2 R E V 1 . 0 Typical Application Circuit Figure 1 Typical Application Circuit Device Function Reference Table Part No. Detection Voltage Output Type Top Mark CN61CN25 2.5V OD N25X CN61CN33 3.3V OD N33X Note 1：OD means Open Drain Output；CMOS means CMOS Output Note 2：X in top mark is the lot number based on internal standard

Ordering Information

P a r t N o .

www.consonance-elec.com 3 R E V 1 . 0 Block Diagram Figure 2 Block Diagram Pin Description Pin No. Symbol Description

1 RES

Voltage Detection Output. This output remains low if VCC drops below V DET, and high after VCC rises above VDET + VHYST . 2 GND Power Supply Negative Terminal (GND).

3 VCC

Power Supply Positive Terminal. This pin is both the power supply to internal ci rcuit and the voltage to be detected. ABSOLUTE MAXIMUM RATINGS Terminal Voltage (With respect to GND) VCC and RES Current 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.

www.consonance-elec.com 4 R E V 1 . 0 Electrical Characteristics (VCC=3.7V , TA= －40℃ to 85 ℃, Typical values are at TA=25℃, unless otherwise noted.) Parameters Symbol Test Conditions M i n T y p M a x U n i t Maximum input voltage VCCMAX 5.5 V Minimum input voltage VCCMIN 1.15 V VCC=3.0V 1.5 3 5 Operating Current IVCC V C C = 3 . 7 V 2 4 6 uA Hysteresis of VDET V HYST VCC rising VDF VDF VDF ×0.03 ×0.05 ×0.07 V t1 VCC from VDET＋0.1V to VDET－0.1V 20 us Delay From VCC to RES t2 VCC from VDET－0.1V to VDET＋0.1V 30 us VCC=2V，ISINK=1.5mA 0.3 RES Output V oltage VOL VCC=3V，ISINK= 3 . 2 m A 0 . 3 V Detailed Description The CN61C series can be used to monitor battery’s voltage. The device consists of a comparator, a low current high precision voltage reference, voltage divider and output driver. It outputs a low level at RES pin whenever the VCC supply voltage declines below a preset threshold, and outputs high after VCC has risen above the reset threshold plus the hysteresis. The CN61C series provides CMOS output or open drain output. The on-chip comparator is designed to ignore fast transients on VCC, and the output are guaranteed to be in the correct logic state for VCC down to 1.15V over the temperature range. The operation of the device can be best understood by referring to figure 3. VCCMIN VCCMIN VRES + VHYST VCC RES VDET Figure 3 Timing Waveform

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Application Information

Negative-Going VCC Transients In addition to outputting a low level at RES pin during low power supply, power-down, and brownout conditions, the CN61C series is relatively immune to short-duration negative-going VCC transients (glitches). As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, a VCC transient that goes 100mV below the reset threshold and lasts 10µs or less will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Power-on Reset Circuit The CN61C series with open drain output can be used to generate the power-on reset signal for a microprocessor, microcontroller or memory, etc. A capacitor should be used between RES pin and GND to generate a delay with pull-up resistor as shown in Figure 4. F i g u r e 4 P o w e r - o n R e s e t C i r c u i t

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Package Information

Consonance Electronics does not assume any responsibility for use of any circuitry described. Consonance reserves the right to change the circuitry and specifications without notice at any time.