Datasheet LTC6995-1, LTC6995-2 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | TimerBlox: Long Timer, Low Frequency Oscillator |
| Páginas / Página | 28 / 1 — FEATURES. DESCRIPTION. Period Range: 1ms to 9.5 Hours. Timing Reset by … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 1.7 Mb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. Period Range: 1ms to 9.5 Hours. Timing Reset by Power-On or Reset Input. APPLICATIONS
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Versión de texto del documento
LTC6995-1/LTC6995-2 TimerBlox: Long Timer, Low Frequency Oscillator
FEATURES DESCRIPTION
n
Period Range: 1ms to 9.5 Hours
The LTC®6995 is a silicon oscillator with a programmable n
Timing Reset by Power-On or Reset Input
period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz), n Configured with 1 to 3 Resistors specifically intended for long duration timing events. The n <1.5% Maximum Frequency Error LTC6995 is part of the TimerBlox® family of versatile n Programmable Output Polarity silicon timing devices. n 2.25V to 5.5V Single Supply Operation A single resistor, RSET , programs the LTC6995’s internal n 55µA to 80µA Supply Current master oscillator frequency. The output clock period (2ms to 9.5hr Clock Period) is determined by this master oscillator and an internal n 500µs Start-Up Time frequency divider, NDIV , programmable to eight settings n CMOS Output Driver Sources/Sinks 20mA from 1 to 221. n –55°C to 125°C Operating Temperature Range n Available in Low Profile (1mm) SOT-23 (ThinSOT™) N t DIV • RSET OUT = • 1.024ms, NDIV = 1,8,64,...,221 and 2mm × 3mm DFN Packages 50kΩ n AEC-Q100 Qualified for Automotive Applications When oscillating, the LTC6995 generates a 50% duty cycle square wave output. A reset function is provided
APPLICATIONS
to stop the master oscillator and clear internal dividers. Removing reset initiates a full output clock cycle which is n Power-On Reset Timer useful for programmable power-on reset and watchdog n Long Time One Shot timer applications. n “Heartbeat” Timers n Watchdog Timers The LTC6995 has two versions of reset functionality. The n Periodic “Wake-Up” Call reset input is active high for the LTC6995-1 and active low n High Vibration, High Acceleration Environments for the LTC6995-2. The polarity of the output when reset All registered trademarks and trademarks are the property of their respective owners. is selectable for both versions.
OUTPUT (OSCILLATOR START STATE) RST/RST POLARITY LTC6995-1 LTC6995-2
0 0 Oscillating (Low) 0 (Reset) 1 0 0 (Reset) Oscillating (Low) 0 1 Oscillating (High) 1 (Reset) 1 1 1 (Reset) Oscillating (High)
TYPICAL APPLICATION Active Low Power-On Reset Timer
RST OUT V+ LTC6995-1 GND V+ V+ 5 SECONDS 0.1µF 1M OUT 1/2 t TIMER STOPPED OUT SET DIV POWER-ON RESET 118k 392k (1ms TO 4.8 HOURS) 699512 TA01 Rev. B Document Feedback 1 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Period Range: 1ms to 9.5 Hours
The LTC®6995 is a silicon oscillator with a programmable n
Timing Reset by Power-On or Reset Input
period range of 1.024ms to 9.54 hours (29.1µHz to 977Hz), n Configured with 1 to 3 Resistors specifically intended for long duration timing events. The n <1.5% Maximum Frequency Error LTC6995 is part of the TimerBlox® family of versatile n Programmable Output Polarity silicon timing devices. n 2.25V to 5.5V Single Supply Operation A single resistor, RSET , programs the LTC6995’s internal n 55µA to 80µA Supply Current master oscillator frequency. The output clock period (2ms to 9.5hr Clock Period) is determined by this master oscillator and an internal n 500µs Start-Up Time frequency divider, NDIV , programmable to eight settings n CMOS Output Driver Sources/Sinks 20mA from 1 to 221. n –55°C to 125°C Operating Temperature Range n Available in Low Profile (1mm) SOT-23 (ThinSOT™) N t DIV • RSET OUT = • 1.024ms, NDIV = 1,8,64,...,221 and 2mm × 3mm DFN Packages 50kΩ n AEC-Q100 Qualified for Automotive Applications When oscillating, the LTC6995 generates a 50% duty cycle square wave output. A reset function is provided
APPLICATIONS
to stop the master oscillator and clear internal dividers. Removing reset initiates a full output clock cycle which is n Power-On Reset Timer useful for programmable power-on reset and watchdog n Long Time One Shot timer applications. n “Heartbeat” Timers n Watchdog Timers The LTC6995 has two versions of reset functionality. The n Periodic “Wake-Up” Call reset input is active high for the LTC6995-1 and active low n High Vibration, High Acceleration Environments for the LTC6995-2. The polarity of the output when reset All registered trademarks and trademarks are the property of their respective owners. is selectable for both versions.
OUTPUT (OSCILLATOR START STATE) RST/RST POLARITY LTC6995-1 LTC6995-2
0 0 Oscillating (Low) 0 (Reset) 1 0 0 (Reset) Oscillating (Low) 0 1 Oscillating (High) 1 (Reset) 1 1 1 (Reset) Oscillating (High)
TYPICAL APPLICATION Active Low Power-On Reset Timer
RST OUT V+ LTC6995-1 GND V+ V+ 5 SECONDS 0.1µF 1M OUT 1/2 t TIMER STOPPED OUT SET DIV POWER-ON RESET 118k 392k (1ms TO 4.8 HOURS) 699512 TA01 Rev. B Document Feedback 1 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts