Datasheet
LTC692/LTC693
4
0692fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
CC
= full operating range, V
BATT
= 2.8V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Watchdog Timeout Period, Internal Oscillator Long Period, V
CC
= 5V
l
1.2
1.0
1.6
1.6
2.00
2.25
sec
sec
Short Period, V
CC
= 5V
l
80
70
100
100
120
140
ms
ms
Watchdog Timeout Period, External Clock
(Note 6)
Long Period
Short Period
4032
960
4097
1025
Clock
Cycles
Reset Active Time PSRR 1 ms/V
Watchdog Timeout Period PSRR, Internal OSC 1 ms/V
Minimum WDI Input Pulse Width V
IL
= 0.4V, V
IH
= 3.5V
l
200 ns
RESET Output Voltage at V
CC
= 1V I
SINK
= 10μA, V
CC
= 1V 4 200 mV
RESET and LOW LINE Output Voltage
(Note 4)
I
SINK
= 1.6mA, V
CC
= 4.25V
I
SOURCE
= 1μA, V
CC
= 5V 3.5
0.4 V
V
RESET and WDO Output Voltage
(Note 4)
I
SINK
= 1.6mA, V
CC
= 5V
I
SOURCE
= 1μA, V
CC
= 4.25V 3.5
0.4 V
V
RESET, RESET, WDO, LOW LINE Output
Short-Circuit Current (Note 4)
Output Source Current
Output Sink Current
13
25
25 μA
mA
WDI Input Threshold Logic Low
Logic High 3.5
0.8 V
V
WDI Input Current WDI = V
OUT
WDI = 0V
l
l
–50
4
–8
50 μA
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
V
PFO Short-Circuit Source Current
(Note 4)
PFI = High, PFO = 0V
PFI = Low, PFO = VOUT
13
25
25 μA
mA
PFI Comparator Response Time (Falling)
ΔV
IN
= –20mV, V
OD
= 15mV
2μs
PFI Comparator Response Time (Rising)
(Note 4)
ΔV
IN
= 20mV, V
OD
= 15mV with 10kΩ
Pull-Up
40
8
μs
μs
Chip Enable Gating
CE IN Threshold V
IL
V
IH
2.0
0.8 V
V
CE IN Pull-Up Current (Note 7) 3μA
CE OUT Output Voltage I
SINK
= 3.2mA
I
SOURCE
= 3mA
I
SOURCE
= 1μA, VCC = 0V
V
OUT
– 1.50
V
OUT
– 0.05
0.4 V
V
V
CE Propagation Delay V
CC
= 5V, C
L
= 20pF
l
20
20
35
45
ns
ns
CE OUT Output Short-Circuit Current Output Source Current
Output Sink Current
30
35
mA
mA