 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC1727ES8-2.5 Datasheet(PDF) 10 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC1727ES8-2.5 Datasheet(HTML) 10 Page - Linear Technology |
|
|
10 / 16 page  10 LTC1727/LTC1728 Override Functions (5V Versions Only) The VCCA pin, if unused, can be tied to either VCC3 or VCC5. This is an obvious solution since the trip points for VCC3 and VCC5 will always be greater than the trip point for VCCA. The VCC5 input trip point is disabled if its voltage is equal to the voltage on VCC3 ±25mV and the voltage on VCC5 is less than 4.15V. In this manner, the LTC1727-5/ LTC1728-5 will behave as a 3.3V monitor and VCC5 reset capability will be disabled. The VCC5 trip point is reenabled when the voltage on VCC5 is equal to the voltage on VCC3 ±25mV and the two inputs are greater than approximately 4.15V. In this manner, the part can function as a 5V monitor with the 3.3V monitor disabled. APPLICATIO S I FOR ATIO Figure 3. RST Voltage vs Supply Voltage Figure 2. Single Supply Monitor with Others Disabled When monitoring either 3.3V or 5V with VCC3 strapped to VCC5 (see Figure 2), the part determines which is the appropriate range. The part handles this situation as shown in Figure 3. Above 1V and below VRT3, RST is held low. From VRT3 to approximately 4.15V the part assumes 3.3V supply monitoring and RST is deasserted. Above approximately 4.15V the part operates as a 5V monitor. In most systems the 5V supply will pass through the 3.1V to 4.15V region in < 200ms during power-up, and the RST output will behave as desired. Table 1 summarizes the state of RST at various operating voltages with VCC3 = VCC5. Table 1. Override Truth Table (VCC3 = VCC5) INPUTS (VCC3 = VCC5 = VCC) RST 0V ≤ VCC ≤ 1V — 1V ≤ VCC ≤ VRT3 0 VRT3 ≤ VCC ≤ 4.15V 1 4.15V ≤ VCC ≤ VRT5 0 VRT5 ≤ VCC 1 VCC3 VCC5 VCCA GND 1 5 4 3 2 RST LTC1728-5 1727/28 F02 TO SYSTEM RESET R1 10k VCC 3.3V OR 5V SUPPLY VOLTAGE (V) 0 3 4 5 4 1727/28 F03 2 1 0 1 2 3 5 VCC3 = VCC5 = VCCA = 0V TO 5V 10k PULL-UP FROM RST TO VCC3 |
Similar Part No. - LTC1727ES8-2.5 |
|
Similar Description - LTC1727ES8-2.5 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
