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| YB1921 3-Pin Microprocessor Reset Monitor Introduction The YB1921 is a cost-effective system supervisor Integrated Circuit (IC) designed to monitor VCC in digital and mixed signal systems and provide a warning signal when the system power supply is out of working range, and a reset signal to the host processor when necessary. No external components are required. The reset output is driven active within 20sec of VCC falling through the reset voltage threshold. Reset is maintained active for a minimum of 140msec after VCC rises above the reset threshold. The YB1921 has an active-low RESET output. The output of the YB1921 is guaranteed valid down to VCC=1V. The YB1921 is optimized to reject fast transient glitches on the VCC line. Low supply current of 18A (VCC=3.3V) makes these devices suitable for battery powered applications. Features Precision VCC Monitor for 2.8V, 3.0V, 3.3V, and 5.0V Supplies 140msec Guaranteed Minimum RESET Output Duration RESET Output Guaranteed to VCC=1.0V Low 18A Supply Current VCC Transient Immunity Small SOT-23 Package No External Components Wide Operating Temperature: 0C to 85C Applications Computers Embedded systems Battery powered equipment Critical P power supply monitoring Application Diagram YB1921 www.yobon.com.tw 1 YB1921 3-Pin Microprocessor Reset Monitor Absolute Maximum Ratings (1) Parameter Symbol Value Value 5.5 -0.3 to (Vcc+0.3) 20 20 Internally Limited (3) Infinite 230 0~85 260 0 to+125 -60 to+150 Unit V V mA mA -- -- C/W C C C C Input Voltage Output Voltage Input Current Output Current Power Dissipation Output Short Circuit Duration Thermal Resistance, Junction-to-Ambient Operating Temperature Range Lead Temperature (Soldering, 10 sec.) Junction Temperature Storage Temperature VCC RESET -- IOUT PD -- JA TA -- TJ TS Recommended Operating Conditions (2) Parameter Symbol Min Power Supply Voltage Junction Temperature VCC TJ 2.0 0 Value Type. -- -- Max 5.5 +125 Unit V C YB1921 www.yobon.com.tw 2 YB1921 3-Pin Microprocessor Reset Monitor Electrical Characteristics Vcc=5V for L/M/J; 3.3V for T/S; 3.0V for R, TA = 25C, unless otherwise specified. Parameter Input Voltage Supply Current Symbol VCC ICC Condition -- -- Min 2.0 -- 4.54 4.29 3.92 3.02 2.87 2.58 -- Typ -- 18 4.63 4.38 4.00 3.08 2.93 2.63 30 Max 5.5 25 4.72 4.47 4.08 3.14 2.99 2.68 -- Unit V A Reset Threshold VTH YB1921L-4.63V YB1921M-4.38V YB1921J-4.00V YB1921T-3.08V YB1921S-2.93V YB1921R-2.63V -- V Reset Threshold Temperature Coefficient (4) VCC to Reset Delay VCC = VTH to (VTH - 100mV) Reset Active Timeout Period RESET Output Voltage Low RESET Output Voltage High -- ppm/C -- -- VOL VOH -- -- ISINK = 3mA ISOURCE = 800A -- -- -- 0.8VCC 20 240 -- -- -- -- 0.4 -- sec msec V V Note 1: Exceeding the absolute maximum rating may damage the device. Note 2: The device is not guaranteed to function outside its operating rating. Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD (MAX) = (TJ (MAX) - TA)/JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. See "Thermal Consideration" section for details Note 4: RESET threshold temperature coefficient is the worst case voltage change divided by the total temperature range. YB1921 www.yobon.com.tw 3 YB1921 3-Pin Microprocessor Reset Monitor Pin Configuration Pin Description Pin No. 2 Symbol GND Ground Description RESET 1 VCC 3 S809La 1 GND 2 RESET RESET output remains low while Vcc is below the reset voltage threshold and for 240msec(typ) after Vcc rises above reset threshold Supply Voltage (typ.) 3 Vcc Ordering/Marking Information Reset Vcc threshold (V) 4.63 4.38 4.00 SOT-23 3.08 2.93 2.63 Package Part Number Marking S809La S809Ma S809Ja S809Ta S809Sa S809Ra * Marking Information Starting with 0, a bar underlined 0 is for production year 2006, on top of 9 is for year 2007. And underlined 9 is for year 2008 The next character is marked on top of 8 for 2009, and underlined 8 for 2010. The naming pattern continues with consecutive characters for later years. The last character is the week code. (A-Z: 1-26, YB1921LB-F YB1921MB-F YB1921JB-F YB1921TB-F YB1921SB-F YB1921RB-F * * * * a-z: 27-52) A dot on top right corner is for lead-free process. * Ordering Information YB1921 www.yobon.com.tw 4 YB1921 3-Pin Microprocessor Reset Monitor Dimension Outline Drawing For SOT-23 C J B H D A E F G K L SYMBOL MIN A B C D E F G H J K L 0.110 0.047 0.083 0.035 0.070 0.018 0.015 INCHES MAX 0.120 0.055 0.104 0.040 0.080 0.024 0.020 0.004 0.040 0.007 0.027 MILLIMETERS MIN 2.80 1.20 2.10 0.89 1.78 0.45 0.37 0.013 0.887 0.085 -- MAX 3.04 1.40 2.64 1.03 2.05 0.60 0.51 0.10 1.02 0.18 0.69 0.0005 0.034 0.003 -- YB1921 www.yobon.com.tw 5 |
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