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| 型号： | LTC694IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/20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
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the operating temperature
range, otherwise specifications are at T A = 25°C . V CC = full operating range, V BATT = 2.8V, unless otherwise noted.
PARAMETER
RESET, RESET , WDO , LOW?LINE
Output Short-Circuit Current (Note 4)
WDI Input Threshold
CONDITIONS
Output Source Current
Output Sink Current
Logic Low
Logic high
MIN
1
3.5
TYP
3
25
MAX
25
0.8
UNITS
μA
mA
V
WDI Input Current
WDI = V OUT
WDI = 0V
l
l
–50
4
–8
50
μA
Power-Fail Detector
PFI Input Threshold
V CC = 5V
l
1.25
1.3
1.35
V
PFI Input Threshold PSRR
0.3
mV/V
PFI Input Current
±0.01
±25
nA
PFO Output Voltage (Note 4)
I SINK = 3.2mA
I SOURCE = 1μA
3.5
0.4
V
PFO Short-Circuit Source Current (Note 4)
PFI = HIGH, PFO = 0V
1
3
25
μA
PFI = LOW, PFO = V OUT
25
mA
PFI Comparator Response Time (Falling)
PFI Comparator Response Time (Rising) (Note 4)
?V IN = –20mV, V OD = 15mV
?V IN = 20mV, V OD = 15mV
with 10kΩ Pull-Up
2
40
8
μs
μs
Chip Enable Gating
CE IN Threshold
CE IN Pull-Up Current (Note 7)
CE OUT Output Voltage
V IL
V IH
I SINK = 3.2mA
I SOURCE = 3.0mA
I SOURCE = 1μA, V CC = 0V
2
V OUT – 1.50
V OUT – 0.05
3
0.8
0.4
V
μA
V
CE Propagation Delay
CE OUT Output Short-Circuit Current
V CC = 5V, C L = 20pF
Output Source Current
Output Sink Current
l
20
20
30
35
35
45
ns
mA
Oscillator
OSC IN Input Current (Note 7)
OSC SEL Input Pull-Up Current (Note 7)
±2
5
μA
μA
OSC IN Frequency Range
OSC IN Frequency with External Capacitor
OSC SEL = 0V
OSC SEL = 0V, C OSC = 47pF
l
0
4
250
kHz
kHz
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All voltage values are with respect to GND.
Note 3: For military temperature range parts or for the LTC692 and
LTC693, consult the factory.
Note 4: The output pins of BATT ON, LOW?LINE , PFO , WDO , RESET and
RESET have weak internal pull-ups of typically 3μA. However, external
pull-up resistors may be used when higher speed is required.
Note 5: The LTC690 and LTC691 have minimum reset active time of 35ms
(50ms typically) while the LTC694 and LTC695 have longer minimum
reset active time of 140ms (200ms typically). The reset active time of
the LTC691 and LTC695 can be adjusted (see Table 2 in Applications
Information section).
Note 6: The external clock feeding into the circuit passes through the
oscillator before clocking the watchdog timer (See Block Diagram).
Variation in the timeout period is caused by phase errors which occur
when the oscillator divides the external clock by 64. The resulting variation
in the timeout period is 64 clocks plus one clock of jitter.
Note 7: The input pins of CE IN, OSC IN and OSC SEL have weak internal
pull-ups which pull to the supply when the input pins are floating.
690ff
For more information www.linear.com/690
5
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