Datasheet

ADM8690/ADM8691/ADM8695 Data Sheet
Rev. C | Page 4 of 24
SPECIFICATIONS
V
CC
= full operating range, V
BATT
= 2.8 V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Min Typ Max Unit Test Conditions/Comments
BATTERY BACKUP SWITCHING
V
CC
Operating Voltage Range 4.75 5.5 V
V
BATT
Operating Voltage Range 2.0 4.25 V
V
OUT
Output Voltage V
CC
− 0.005 V
CC
− 0.0025 V I
OUT
= 1 mA
V
CC
− 0.2 V
CC
− 0.125 V I
OUT
≤ 100 mA
V
OUT
in Battery Backup Mode V
BATT
− 0.005 V
BATT
− 0.002 V I
OUT
= 250 µA, V
CC
< V
BATT
− 0.2 V
Supply Current (Excludes I
OUT
) 140 200 µA I
OUT
= 100 µA
Supply Current in Battery Backup Mode 0.4 1 µA V
CC
= 0 V, V
BATT
= 2.8 V
Battery Standby Current 5.5 V > V
CC
> V
BATT
+ 0.2 V
+ = Discharge, − = Charge −0.1 +0.02 µA T
A
= 25°C
Battery Switchover Threshold 70 mV Power-up
V
CC
− V
BATT
50 mV Power-down
Battery Switchover Hysteresis 20 mV
BATT ON Output Voltage 0.3 V I
SINK
= 3.2 mA
BATT ON Output Short-Circuit Current 55 mA BATT ON = V
OUT
= 4.5 V, sink current
0.5 2.5 25 µA BATT ON = 0 V, source current
RESET AND WATCHDOG TIMER
Reset Voltage Threshold 4.5 4.65 4.73 V
Reset Threshold Hysteresis 40 mV
Reset Timeout Delay
ADM8690 and ADM8691 35 50 70 ms OSC SEL = high
ADM8695 140 200 280 ms OSC SEL = high
Watchdog Timeout Period, Internal
Oscillator
1.0 1.6 2.25 Seconds Long period
70 100 140 ms Short period
Watchdog Timeout Period, External Clock 3840 4064 4097 Cycles Long period
768 1011 1025 Cycles Short period
Minimum WDI Input Pulse Width 50 ns V
IL
= 0.4 V, V
IH
= 3.5 V
RESET Output Voltage at V
CC
= 1 V
4 20 mV I
SINK
= 10 µA, V
CC
= 1 V
RESET, LOW LINE Output Voltage
0.05 0.4 V I
SINK
= 1.6 mA, V
CC
= 4.25 V
3.5 V I
SOURCE
= 1 µA
RESET, WDO Output Voltage
0.4 V I
SINK
= 1.6 mA
3.5 V I
SOURCE
= 1 µA
Output Short-Circuit Source Current 1 10 25 µA
Output Short-Circuit Sink Current 25 mA
WDI Input Threshold
1
Logic Low 0.8 V
Logic High 3.5 V
WDI Input Current 1 10 µA WDI = V
OUT
−10 −1 µA WDI = 0 V
POWER-FAIL DETECTOR
PFI Input Threshold 1.25 1.3 1.35 V V
CC
= 5 V
PFI Input Current −25 ±0.01 +25 nA
PFO Output Voltage
0.4 V I
SINK
= 3.2 mA
3.5 V I
SOURCE
= 1 µA
PFO Short-Circuit Source Current
1 3 25 A
PFI = low, PFO = 0 V
PFO Short-Circuit Sink Current
25 mA
PFI = high, PFO = V
OUT