LTC1235CS Linear Technology, LTC1235CS Datasheet - Page 3

• Manufacturer Part Number: LTC1235CS
• Manufacturer: Linear Technology

Specifications of LTC1235CS

• Number Of Elements: 1
• Monitored Voltage 1 (typ): 4.65V
• Battery Backup Switching: Yes
• Watchdog Timer: Yes
• Chip Enable Signals: Yes
• Reset Active Time: 280ms
• Manual Reset: Yes
• Package Type: SOL
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.5V
• Reset Threshold Voltage (max): 4.75V
• Reset Threshold Voltage (min): 4.5V
• Power Dissipation: 500mW
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Power Fail Detection: Yes
• Mounting: Surface Mount
• Pin Count: 16
• Supply Current: 1.5mA
• Lead Free Status / Rohs Status: Not Compliant

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
T
PARAMETER
Battery Backup Switching
Operating Voltage Range
V
BACKUP Input Threshold
BACKUP Pullup Current (Note 4)
V
V
V
Battery Supply Current in Battery Backup Mode
Battery Standby Current
Battery Switchover Threshold
Battery Switchover Hysteresis
BATT ON Output Voltage (Note 6)
BATT ON Output Short Circuit Current (Note 6)
Push-Button Reset
PB RST Input Threshold
PB RST Input Low Time (Notes 4, 7)
Reset and Watchdog Timer
Reset Voltage Threshold
Reset Threshold Hysteresis
Reset Active Time
Watchdog Time-out Period
Reset Active Time PSRR
Watchdog Time-out Period PSRR
Minimum WDI Input Pulse Width
RESET Output Voltage At V
RESET and LOW LINE Output Voltage
RESET and WDO Output Voltage
A
OUT
OUT
OUT
CC
(Note 6)
(Note 6)
= 25°C, unless otherwise noted.
V
V
and Battery Saving Mode (Note 5)
(+ = Discharge, – = Charge)
V
Supply Current (excluding I
CC
BATT
CC
Output Voltage
in Battery Backup Mode (Note 5)
in Battery Saving Mode (Note 5)
– V
BATT
CC
= 1V
OUT
)
CONDITIONS
I
I
V
I
V
1MΩ Pulldown on V
I
V
5.5 > V
Power-Up
Power-Down
I
BATT ON = V
BATT ON = 0V Source Current
Logic Low
Logic High
V
V
V
I
I
I
I
I
OUT
OUT
OUT
OUT
SINK
SINK
SINK
SOURCE
SINK
SOURCE
CC
CC
CC
CC
CC
IL
Logic Low
Logic High
= 0.4V, V
> Reset Voltage Threshold
< V
= 0V, V
= 5V
= 5V
= 1mA
= 50mA
= 250μA, V
≤ 50mA
A
= 3.2mA
= 10μA, V
= 1.6mA, V
= 1.6mA, V
CC
= 25°C. V
BATT
= 1μA, V
= 1μA, V
> V
BATT
The
IH
OUT
BATT
= 3.5V
CC
CC
l
= 2.8V
CC
CC
CC
CC
Sink Current
CC
= 1V
+ 0.2V
denotes the specifi cations which apply over the full operating
< V
= 4.25V
= 5V
= 5V
= 4.25V
OUT
= Full Operating Range, V
BATT
l
l
l
l
l
l
l
l
l
V
V
V
V
BATT
CC
BATT
CC
CC
4.75
2.00
–0.1
MIN
–1.0
140
200
2.0
0.5
2.0
4.5
1.2
1.0
3.5
3.5
40
60
– 0.05
– 0.5
– 0.1
– 0.1 V
= 2.8V, Backup = No Connection,
V
V
V
BATT
CC
CC
CC
0.04
0.04
4.65
TYP
200
200
– 0.005
– 0.005
0.6
0.6
1.6
1.6
70
50
20
35
40
– 0.25
3
0
1
1
8
4
– 0.02
LTC1235
+0.02
+0.10
MAX
5.50
4.25
4.75
2.00
2.25
240
280
200
0.8
1.5
2.5
0.4
0.8
0.4
0.4
25
1
5
UNITS
ms/V
ms/V
1235fa
3
mA
mA
mV
mV
mV
mA
mV
sec
sec
mV
ms
ms
ms
μA
μA
μA
μA
μA
μA
ns
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V