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参数资料
| 型号： | LTC694IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRCUIT 8SOIC |
| 标准包装： | 100 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LTC690/LTC691
LTC694/LTC695
BLOCK DIAGRAM
VBATT
VCC
–
+
C2
M2
M1
CHARGE
PUMP
VOUT
BATT ON
LOW?LINE
1.3V
+
C1
–
CE OUT
CE IN
GND
PFI
OSC IN
OSC SEL
WDI
–
+
OSC
TRANSITION
DETECTOR
C3
RESET PULSE
GENERATOR
WATCHDOG
TIMER
PFO
RESET
RESET
WDO
690 BD
PIN FUNCTIONS
V CC : 5V Supply Input. The V CC pin should be bypassed
with a 0.1μF capacitor.
V OUT : Voltage Output for Backed Up Memory. Bypass with
a capacitor of 0.1μF or greater. During normal operation,
V OUT obtains power from V CC through an NMOS power
switch, M1, which can deliver up to 50mA and has a typical
on resistance of 5Ω. When V CC is lower than V BATT , V OUT
is internally switched to V BATT . If V OUT and V BATT are not
used, connect V OUT to V CC .
V BATT : Back-Up Battery Input. When V CC falls below V BATT ,
auxiliary power, connected to V BATT , is delivered to V OUT
through PMOS switch, M2. If back-up battery or auxiliary
power is not used, V BATT should be connected to GND.
GND: Ground pin.
BATT ON: Battery On Logic Output from Comparator C2.
BATT ON goes low when V OUT is internally connected to
V CC . 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 V OUT . BATT ON
goes high when V OUT is internally switched to V BATT .
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 V OUT
when C3 is not used.
690ff
6
For more information www.linear.com/690
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