LTC690 Linear Technology, LTC690 Datasheet - Page 3

• Manufacturer Part Number: LTC690
• Description: Microprocessor Supervisory Circuits
• Manufacturer: Linear Technology

ELECTRICAL C
range, otherwise specifications are at T
PARAMETER
Battery Back-Up Switching
Operating Voltage Range
V
V
Supply Current (Exclude I
Supply Current in Battery Back-Up Mode
Battery Standby Current (+ = Discharge, – = Charge)
Battery Switchover Threshold, V
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)
Reset Active Time (LTC694/95) (Note 5)
Watchdog Time-Out Period, Internal Oscillator
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 V
RESET and LOW LINE Output Voltage (Note 4)
RESET and WDO Output Voltage (Note 4)
OUT
OUT
Output Voltage
in Battery Back-Up Mode
OUT
CC
)
HARA TERISTICS
= 1V
CC
– V
BATT
C
A
= 25 C. V
CONDITONS
V
V
I
I
I
I
V
5.5 > V
Power Up
Power Down
I
BATT ON = V
BATT ON = 0V Source Current
LTC690M
OSC SEL HIGH, V
OSC SEL HIGH, V
Long Period, V
Short Period, V
Long Period
Short Period
V
I
I
I
I
I
OUT
OUT
OUT
OUT
SINK
SINK
SINK
SOURCE
SINK
SOURCE
CC
CC
BATT
CC
IL
= 0.4V, V
= 0V, V
= full operating range, V
= 250 A, V
= 1mA
= 50mA
= 3.2mA
= 10 A, V
= 1.6mA, V
= 1.6mA, V
50mA
CC
= 1 A, V
= 1 A, V
> V
The
BATT
IH
OUT
BATT
CC
= 3.5V
CC
CC
CC
= 2.8V
CC
CC
CC
CC
CC
CC
Sink Current
= 5V
= 5V
= 1V
+ 0.2V
denotes specifications which apply over the operating temperature
< V
= 4.25V
= 5V
= 5V
= 4.25V
= 5V
= 5V
BATT
BATT
= 2.8V, unless otherwise noted.
V
V
V
V
BATT
CC
CC
CC
– 0.1
4032
4.75
2.00
–1.0
MIN
160
140
960
200
0.5
4.5
4.4
1.2
1.0
3.5
3.5
80
40
35
70
– 0.10
– 0.50
– 0.05
– 0.1
V
V
V
LTC694/LTC695
V
LTC690/LTC691
BATT
CC
CC
CC
0.04
0.04
4.65
4.65
TYP
200
200
100
100
– 0.005
– 0.005
– 0.250
0.6
0.6
1.6
1.6
70
50
20
35
40
50
50
1
1
1
4
– 0.02
+ 0.02
+ 0.10
4097
1025
MAX
5.50
4.25
4.75
4.75
2.00
2.25
240
280
120
140
200
1.5
2.5
0.4
0.4
0.4
25
60
70
1
5
UNITS
Cycles
Clock
ms/V
ms/V
3
mA
mA
mV
mV
mV
mV
sec
sec
mV
ms
ms
ms
ms
ms
ms
ns
m
V
V
V
V
V
V
A
A
A
A
V
A
V
V
V
V
V
V