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| 3-Pin Microprocessor Reset Monitor (Preliminary) Description The CYT809 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 CYT809 has an active-low RESET output. The output of the CYT809 is guaranteed valid down to VCC=1V. Both devices are available in a SOT-23 package. Computers The CYT809 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. Embedded systems Battery powered equipment CYT809 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 Application Critical P power supply monitoring Pin Configuration Application Diagram Vcc Vcc CYT809 RESET Vcc PROCESSOR RESET INPUT GND GND Preliminary and all contents are subject to change without prior notice. 1 3-Pin Microprocessor Reset Monitor (Preliminary) Ordering/Marking Information Ordering Information CYT809xS Marking Information CYT809 C809xa * Reset VCC threshold(V) 4.63 4.38 4.00 3.08 2.93 2.63 Starting with 8, a bar on top of 8 is for production year 2003, and underlined 1 is for year 2004. next character is marked on top for 2005, and The Suffix L M J T S R underlined for 2006. The naming pattern continues with consecutive characters for later years. The "x" denotes a suffix for VCC threshold . The last character is the week code. (A-Z: 1-26, a-z: 27-52) A dot on top right corner is for lead-free process. Absolute Maximum Ratings(1) Parameter 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 TJ TS JA TA Symbol VCC RESET -IOUT PD Value 5.5 -0.3 to (VCC + 0.3) 20 20 Internally Limited Infinite 230 0 ~ 85 260 0 to +125 -60 to +150 C/W C C C (3) Units V V mA mA Operating Rating(2) Parameter Supply Input Voltage Junction Temperature Symbol VCC TJ Value +2.0V to +5.5 0 to +125 Units V C Preliminary and all contents are subject to change without prior notice. 2 3-Pin Microprocessor Reset Monitor (Preliminary) Electrical Characteristics Vcc=5V for L/M/J ;3.3V for T/S ;3.0V for R ,TA = 25C, unless otherwise specified. CYT809 Symbol VCC ICC Parameter Input Voltage Supply Current Condition Min 2.0 -- Typ Max 5.5 Unit V A 18 25 CYT809Lxx : CYT809Mxx : VTH Reset Threshold CYT809Jxx : CYT809Txx : CYT809Sxx : CYT809Rxx : Reset Threshold Temperature Coefficient(4) VCC to Reset Delay VCC = VTH to (VTH - 100mV) Reset Active Timeout Period VOL VOH RESET Output Voltage Low RESET Output Voltage High ISINK = 3mA ISOURCE = 800A 4.54 4.29 3.92 3.02 2.87 2.58 -- 4.63 4.38 4.00 3.08 2.93 2.63 30 4.72 4.47 4.08 3.14 2.99 2.68 -ppm/C V -140 -0.8VCC 20 240 --- -600 0.4 -- sec msec V V PIN DESCRIPTION: Pin No. 1 2 Symbol GND RESET Description Ground RESET output remains low while Vcc is below the reset voltage threshold and for 240msec(typ) after Vcc rises above reset threshold 3 Vcc Supply Voltage (typ.) 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. Preliminary and all contents are subject to change without prior notice. 3 3-Pin Microprocessor Reset Monitor (Preliminary) OUTLINE DRAWING SOT-23 C J B H CYT809 DIM A B C D E F G H J K L N DIMENSIONS INCHES MM MIN MAX MIN MAX 0.110 0.047 0.083 0.035 0.070 0.018 0.015 0.0005 0.034 0.003 0.120 0.055 0.104 0.040 0.080 0.024 0.020 0.004 0.040 0.007 0.027 2.80 1.20 2.10 0.89 1.78 0.45 0.37 0.013 0.887 0.085 3.04 1.40 2.64 1.03 2.05 0.60 0.51 0.10 1.02 0.18 0.69 D A E F G K L Preliminary and all contents are subject to change without prior notice. 4 |
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