LTC690M 查看數據表（PDF） - Linear Technology
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LTC690M Datasheet PDF : 16 Pages
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LTC690/LTC691
LTC694/LTC695
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the operating temperature
range, otherwise specifications are at TA = 25°C. VCC = full operating range, VBATT = 2.8V, unless otherwise noted.
PARAMETER
Battery Back-Up Switching
Operating Voltage Range
VOUT Output Voltage
CONDITONS
VCC
VBATT
IOUT = 1mA
VOUT in Battery Back-Up Mode
Supply Current (Exclude IOUT)
IOUT = 50mA
IOUT = 250µA, VCC < VBATT
IOUT ≤ 50mA
Supply Current in Battery Back-Up Mode
VCC = 0V, VBATT = 2.8V
Battery Standby Current (+ = Discharge, – = Charge) 5.5 > VCC > VBATT + 0.2V
Battery Switchover Threshold, VCC – VBATT
Battery Switchover Hysteresis
BATT ON Output Voltage (Note 4)
BATT ON Output Short-Circuit Current (Note 4)
Reset and Watchdog Timer
Reset Voltage Threshold
Reset Threshold Hysteresis
Reset Active Time (LTC690/91) (Note 5)
Power Up
Power Down
ISINK = 3.2mA
BATT ON = VOUT Sink Current
BATT ON = 0V Source Current
LTC690M
OSC SEL HIGH, VCC = 5V
Reset Active Time (LTC694/95) (Note 5)
OSC SEL HIGH, VCC = 5V
Watchdog Time-Out Period, Internal Oscillator
Long Period, VCC = 5V
Short Period, VCC = 5V
Watchdog Time-Out Period, External Clock (Note 6)
Reset Active Time PSRR
Watchdog Time-Out Period PSRR, Internal OSC
Minimum WDI Input Pulse Width
RESET Output Voltage at VCC = 1V
RESET and LOW LINE Output Voltage (Note 4)
RESET and WDO Output Voltage (Note 4)
Long Period
Short Period
VIL = 0.4V, VIH = 3.5V
ISINK = 10µA, VCC = 1V
ISINK = 1.6mA, VCC = 4.25V
ISOURCE = 1µA, VCC = 5V
ISINK = 1.6mA, VCC = 5V
ISOURCE = 1µA, VCC = 4.25V
MIN
TYP
4.75
2.00
VCC – 0.05
q VCC – 0.10
VCC – 0.50
VBATT – 0.1
q
q
– 0.1
q
– 1.0
VCC – 0.005
VCC – 0.005
VCC – 0.250
VBATT – 0.02
0.6
0.6
0.04
0.04
70
50
20
35
0.5
1
q
4.5
4.65
q
4.4
4.65
40
40
50
q
35
50
160
200
q
140
200
1.2
1.6
q
1.0
1.6
80
100
q
70
100
4032
960
1
1
q
200
4
3.5
3.5
MAX UNITS
5.50
V
4.25
V
V
V
V
V
1.5
mA
2.5
mA
1
µA
5
µA
+ 0.02
µA
+ 0.10
µA
mV
mV
mV
0.4
V
m
25
µA
4.75
V
4.75
V
mV
60
ms
70
ms
240
ms
280
ms
2.00
sec
2.25
sec
120
ms
140
ms
4097 Clock
1025 Cycles
ms/V
ms/V
ns
200
mV
0.4
V
V
0.4
V
V
3
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