전자부품 데이터시트 검색엔진 |
|
LTC692 데이터시트(PDF) 6 Page - Linear Technology |
|
LTC692 데이터시트(HTML) 6 Page - Linear Technology |
6 / 16 page 6 LTC692/LTC693 time-out period (see Figure 11). The reset active time is adjustable on the LTC693. An external pushbutton reset can be used in connection with the RESET output. See Pushbutton Reset in the Applications Information section. RESET: RESET is an Active High Logic Ouput. It is the inverse of RESET. LOW LINE: Logic Output from Comparator C1. LOW LINE indicates a low line condition at the VCC input. When VCC falls below the reset voltage threshold (4.40V typically), LOW LINE goes low. As soon as VCC rises above the reset voltage threshold, LOW LINE returns high (see Figure 1). LOW LINE goes low when VCC drops below VBATT (see Table 1). WDI: Watchdog Input. WDI is a three level input. Driving WDI either high or low for longer than the watchdog time- out period, forces both RESET and WDO low. Floating WDI disables the Watchdog Timer. The timer resets itself with each transition of the Watchdog Input (see Figure 11). WDO: Watchdog Logic Output. When the watchdog input remains either high or low for longer than the watchdog time-out period, WDO goes low. WDO is set high whenever there is a transition on the WDI pin, or LOW LINE goes low. The watchdog timer can be disabled by floating WDI (see Figure 11). CE IN: Logic Input to the Chip Enable Gating Circuit. CE IN can be derived from microprocessor's address line and/or decoder output. See Applications Information Section and Figure 5 for additional information. CE OUT: Logic Output on the Chip Enable Gating Circuit. When VCC is above the reset voltage threshold, CE OUT is a buffered replica of CE IN. When VCC is below the reset voltage threshold CE OUT is forced high (see Figure 5). OSC SEL: Oscillator Selection Input. When OSC SEL is high or floating, the internal oscillator sets the reset active time and watchdog time-out period. Forcing OSC SEL low allows OSC IN to be driven from an external clock signal or an external capacitor to be connected between OSC IN and GND. VCC: 5V Supply Input. The VCC pin should be bypassed with a 0.1 µF capacitor. VOUT: Voltage Output for Backed Up Memory. Bypass with a capacitor of 0.1 µF or greater. During normal operation, VOUT obtains power from VCC through an NMOS power switch, M1, which can deliver up to 50mA and has a typical ON resistance of 5 Ω. When VCC is lower than VBATT, VOUT is internally switched to VBATT. If VOUT and VBATT are not used, connect VOUT to VCC. VBATT: Backup Battery Input. When VCC falls below VBATT, auxiliary power connected to VBATT, is delivered to VOUT through PMOS switch, M2. If backup battery or auxiliary power is not used, VBATT should be connected to GND. GND: Ground Pin. BATT ON: Battery On Logic Output from Comparator C2. BATT ON goes low when VOUT is internally connected to VCC. The output typically sinks 35mA and can provide base drive for an external PNP transistor to increase the output current above the 50mA rating of VOUT. BATT ON goes high when VOUT is internally switched to VBATT. PFI: Power Failure Input. PFI is the noninverting input to the Power Fail Comparator, C3. The inverting input is internally connected to a 1.3V reference. The Power Failure Output remains high when PFI is above 1.3V and goes low when PFI is below 1.3V. Connect PFI to GND or VOUT when C3 is not used. PFO: Power Failure Output from C3. PFO remains high when PFI is above 1.3V and goes low when PFI is below 1.3V. When VCC is lower than VBATT, C3 is shut down and PFO is forced low. RESET: Logic Output for µP Reset Control. Whenever VCC falls below either the reset voltage threshold (4.40V typically) or VBATT, RESET goes active low. After VCC returns to 5V, reset pulse generator forces RESET to remain active low for a minimum of 140ms. When the watchdog timer is enabled but not serviced prior to a preset time-out period, reset pulse generator also forces RESET to active low for a minimum of 140ms for every preset PI FU CTIO S |
유사한 부품 번호 - LTC692 |
|
유사한 설명 - LTC692 |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |