Datasheet

ManualsBrandsMicrochip ManualsClockCMOS RC Timer / Oscillator 5MHz 2.7 ... 18V SOT-23

 

MIC1555/57

Features

 

 

 

 



 

 

 



 

 

 

 

 

 



 

Applications

 

 

 

 

 

 

 

 

 

 

 

General Description

      



       



        





       

  





     









        





      

    



        





        

        

     

      

      



IttyBitty RC Timer/Oscillator

Summary of content (24 pages)

PAGE 1
MIC1555/57 IttyBitty RC Timer/Oscillator Features General Description • +2.7V to +18V Operation • Low Current - <1 μA Typical Shutdown Mode (MIC1557) - 200 μA Typical (TRG and THR Low) at 3V Supply • Timing from Microseconds to Hours • “Zero” Leakage Trigger and Threshold Inputs • 50% Square Wave with One Resistor, One Capacitor • Threshold Input Precedence Over Trigger Input • <15Ω Output On-Resistance • No Output Cross-Conduction Current Spikes • <0.005%/°C Temperature Stability • <0.
PAGE 2
MIC1555/57 Package Types MIC1555 5-PIN TSOT-23 (D5) (TOP VIEW) MIC1555 5-PIN SOT-23 (M5) (TOP VIEW) MIC1555 10-PIN UTDFN (MU) (TOP VIEW) MIC1557 5-PIN TSOT-23 (D5) (TOP VIEW) MIC1557 5-PIN SOT-23 (M5) (TOP VIEW) Typical Application Circuits MIC1555 MONOSTABLE WITH ENABLE MIC1555 MONOSTABLE (ONE-SHOT) MIC1557 ASTABLE (OSCILLATOR) DS20005730B-page 2  2017-2019 Microchip Technology Inc.
PAGE 3
MIC1555/57 Functional Diagrams MIC155YM5/MIC155YD5 BLOCK DIAGRAM WITH EXTERNAL COMPONENTS (MONOSTABLE CONFIGURATION) MIC1555YMU BLOCK DIAGRAM WITH EXTERNAL COMPONENTS (MONOSTABLE CONFIGURATION) MIC1557YM5/MIC1557YD5 BLOCK DIAGRAM WITH EXTERNAL COMPONENTS (ASTABLE CONFIGURATION)  2017-2019 Microchip Technology Inc.
PAGE 4
MIC1555/57 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Voltage (VS).................................................................................................................................................. +22V Threshold Voltage (VTHR, VT/T) ................................................................................................................................ +22V Trigger Voltage (VTGR, VT/T) ............................................................................
PAGE 5
MIC1555/57 TABLE 1-1: ELECTRICAL CHARACTERISTICS (Note 1) Electrical Characteristics: TA = +25°C, bold values indicate –40°C ≤ TA ≤ +85°C, unless noted. Parameter Supply Current Monostable Timing Accuracy Monostable Drift Over Temperature Symbol IS — — Monostable Drift Over Supply — Astable Timing Accuracy — Maximum Astable Frequency — Astable Drift Over Temperature — Min. Typ. Max.
PAGE 6
MIC1555/57 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Sym. Min. Typ. Max. Units Conditions TS –65 — +150 °C — Temperature Ranges Ambient Storage Temperature Lead Temperature — — — +300 °C Soldering, 10 sec.
PAGE 7
MIC1555/57 2.0 Note: TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. FIGURE 2-1: Astable Frequency.
PAGE 8
MIC1555/57 FIGURE 2-7: k Factors Times RC. FIGURE 2-8: MIC1555YMU and MIC1557 Chip Select vs. Supply Voltage. DS20005730B-page 8  2017-2019 Microchip Technology Inc.
PAGE 9
MIC1555/57 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1, Table 3-2, and . TABLE 3-1: PIN FUNCTION TABLE, MIC1555 SOT-23 AND TSOT-23 Pin Number Pin Name Description 1 VS 2 GND Ground: Supply return. 3 OUT Output: CMOS totem-pole output. Supply (Input): +2.7V to +18V supply. 4 TRG Trigger (Input): Sets output high. Active-low (at ≤2/3VS nominal). 5 THG Threshold (Dominant Input): Sets output low. Active-high (at ≥2/3VS nominal).
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MIC1555/57 4.0 FUNCTIONAL DESCRIPTION The MIC1555/7 provides the logic for creating simple RC timer or oscillator circuits. The MIC1555 has separate THR (threshold) and TRG (trigger) connections for monostable (one-shot) or astable (oscillator) operation. The MIC1557 has a single T/T (threshold and trigger) connection for astable (oscillator) operation only. The MIC1557 includes a CS (chip select/reset) control. For more information, refer to the Functional Diagrams for MIC1555 and MIC1557. 4.
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MIC1555/57 5.0 APPLICATION INFORMATION 5.1 Basic Monostable (One-Shot) Circuit A monostable oscillator produces a single pulse each time that it is triggered, and is often referred to as a “one-shot.” The pulse width is constant, while the time between pulses depends on the trigger input. One-shots are generally used to stretch incoming pulses of varying widths to a fixed width. The IttyBitty MIC1555 is designed for monostable operation, but may also be connected to provide astable oscillations.
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MIC1555/57 The MIC1555YMU and MIC1557 feature a CS input. With a logic-low signal, CS places the part into a <1 μA shutdown state. If unused, the CS input must be pulled up. FIGURE 5-4: Configuration. 5.3 FIGURE 5-2: Oscillator Diagram. The MIC1555 or MIC1557 can be used to construct an oscillator. The frequency of an astable oscillator is: MIC1557 Oscillator Falling-Edge Triggered Monostable Circuit The MIC1555 may be triggered by an AC-coupled falling edge, as shown in Figure 5-5.
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MIC1555/57 standard N-channel MOSFET may be driven by a second MIC1555/7, powered by 12V to 15V, to level-shift the input. FIGURE 5-6: Configuration. Rising Edge Trigger FIGURE 5-7: 5.5 Accuracy The two comparators in the MIC1555/7 use a resistor voltage divider to set the threshold and trigger trip points to approximately 2/3 and 1/3 of the input voltage, respectively.
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MIC1555/57 FIGURE 5-9: DS20005730B-page 14 Audible Voltmeter.  2017-2019 Microchip Technology Inc.
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MIC1555/57 6.0 PACKAGING INFORMATION 5-Lead SOT-23 Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging.  2017-2019 Microchip Technology Inc.
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MIC1555/57 5-Lead Thin SOT-23 Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging. DS20005730B-page 16  2017-2019 Microchip Technology Inc.
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MIC1555/57 10-Lead 2 mm x 2 mm UTDFN Package Outline and Recommended Land Pattern Note: For the most current package drawings, please see the Microchip Packaging Specification located at http://www.microchip.com/packaging.  2017-2019 Microchip Technology Inc.
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MIC1555/57 NOTES: DS20005730B-page 18  2017-2019 Microchip Technology Inc.
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MIC1555/57 APPENDIX A: REVISION HISTORY Revision A (March 2017) • Converted Micrel document MIC1555/57 to Microchip data sheet DS20005730A. • Minor text changes throughout. • Updated Supply Current values for MIC1557 in Section 1.0 “Electrical Characteristics”. Revision B (April 2019) • Corrected part number and package type in the Package Types section.  2017-2019 Microchip Technology Inc.
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MIC1555/57 NOTES: DS20005730B-page 20  2017-2019 Microchip Technology Inc.
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MIC1555/57 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office. PART NO. X X – XX Examples: a) MIC1555YM5-TR: IttyBitty RC Timer/Oscillator –40°C to +85°C Temp. Range, 5-Lead SOT-23, 3,000/Reel b) MIC1555YD5-TR: IttyBitty RC Timer/Oscillator –40°C to +85°C Temp. Range, 5-Lead TSOT-23, 3,000/Reel c) MIC1555YMU-T5: IttyBitty RC Timer/Oscillator –40°C to +85°C Temp.
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MIC1555/57 NOTES: DS20005730B-page 22  2017-2019 Microchip Technology Inc.
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Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
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