ltc1726-5 Linear Technology Corporation, ltc1726-5 Datasheet
ltc1726-5
Related parts for ltc1726-5
ltc1726-5 Summary of contents
Page 1
... FEATURES Monitors Three Inputs Simultaneously ■ LTC1726-5: 5V, 3.3V and ADJ LTC1726-2.5: 2.5V, 3.3V and ADJ ±1.5% Threshold Accuracy Over Temperature ■ ■ Low Supply Current: 16µA Typ ■ Adjustable Reset Timeout ■ Adjustable Watchdog Timeout ■ Active Low Open-Drain Reset Output ■ Power Supply Glitch Immunity ≥ ...
Page 2
... Less Than Reset CC25 CC5 CC3 CCA Threshold V by More Than 1% RT ORDER PART NUMBER LTC1726ES8-2.5 TOP VIEW LTC1726ES8 LTC1726IS8-2 LTC1726IS8-5 RST PART MARKING 4 5 WDI 172625 S8 PACKAGE 8-LEAD PLASTIC SO 17265 = 125°C, θ = 150°C/W ...
Page 3
... Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls TYPICAL PERFOR A CE CHARACTERISTICS V Threshold Voltage CC5 vs Temperature (LTC1726-5) 4.750 4.725 4.700 4.675 4.650 4.625 4.600 –60 – ...
Page 4
... TEMPERATURE (°C) Watchdog Time-Out Period vs Temperature 1500pF WT (SILVER MICA –60 –40 – TEMPERATURE (° Temperature (LTC1726-5) VCC3 1 CC5 1 3.3V CC3 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 80 100 –60 –40 – TEMPERATURE (°C) 1726 G05 Typical Transient Duration ...
Page 5
... Bypass this pin to ground CC25 CC5 with a 0.1µF or larger ceramic capacitor. V (Pin 2): 5V Sense Input (LTC1726-5). This pin also CC5 supplies power to the part when the voltage on this pin is greater than the voltage on V CC3 ground with a 0.1µF or larger ceramic capacitor. ...
Page 6
... LTC1726 CTIO S RT (Pin 8): Reset Time-Out Input. Place a capacitor between this pin and ground to adjust the reset time-out period. To determine the reset time-out period 3.30 • BLOCK DIAGRA WDI CC3 CC5 CC25 V 3 CCA GND ...
Page 7
... The V input trip point is disabled if its voltage is equal CC5 ±25mV and the voltage the voltage on V CC3 less than 4.15V. In this manner the LTC1726-5 behaves as a 3.3V monitor and the 5V reset function is disabled. The V trip point is re-enabled when the voltage on CC5 V ...
Page 8
... Figure 3 contains a simple circuit for 5V systems that can’t risk the RST output going high in the 3.1V to 4.15V range (possibly due to very slow rise time on the 5V supply). Diode D1 powers the LTC1726-5 while dropping ≈ 0.6V from the V pin to the V pin. This prevents the part’s ...
Page 9
... RST SYSTEM RESET 5 WDI WDI 1726 TA04 LTC1726 , is adjusted between the WT pin and WT /21 µs (i.e., 1500pF ⇒ 32.7ms). The in pF and t WT CCA LTC1726 3. CC3 CC5 3 6 SYSTEM RESET V RST CCA 4 5 WDI ...
Page 10
... V RT CC3 CC25 R1 RST CCA 4 5 R2* GND WDI *TO PRESERVE THRESHOLD ACCURACY, SET PARALLEL COMBINATION OF R1 AND R2 ≤ 66.5k Using V Tied to DC/DC Feedback Divider CCA 2.9V 35.7k LTC1726 3. CC3 OSENSE CC5 RST CCA 4 5 22.1k GND ...
Page 11
... TYP .016 – .050 .014 – .019 (0.406 – 1.270) (0.355 – 0.483) TYP INCHES (MILLIMETERS) LTC1726 0.52 (.206 REF 3.00 ± 0.102 (.118 ± .004) NOTE ...
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... Precision Six Supply Monitor LTC2910 Octal Positive/Negative Voltage Monitor Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 12V (± 5 11.2V TRIP (± 0.17V) 5V 3.3V V CC3 100nF LTC1726 R3* CC5 1.07M 100nF 0.1% V CCA R2 105k 0.1% GND V CCA V = (R1 + R2) ...