Datasheet

(V
CC
= 2.25V to 5.5V, V
BATT
= 3V, RESET not asserted, T
A
= -40°C to +85°C, for MAX16039PLA31+T, T
A
= -55°C to +85°C, unless
otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note 1: All devices are 100% production tested at T
A
= +25°C. All overtemperature limits are guaranteed by design.
Note 2: V
BATT
can be 0V any time, or V
CC
can go down to 0V if V
BATT
is active (except at startup).
Note 3: Positive current flows into BATT.
Note 4: Guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
WATCHDOG (MAX16034/MAX16038)
Watchdog Timeout Period t
WD
1.00 1.65 2.25 s
Minimum WDI Input Pulse Width t
WDI
(Note 4) 100 ns
WDI Input Voltage
V
IL
0.3 x V
CC
V
V
IH
0.7 x V
CC
WDI Input Current -1.0 +1.0 µA
BATTON (MAX16035/MAX16039)
Output Voltage V
OL
I
SINK
= 3.2mA, V
BATT
= 2.1V 0.4 V
Output Short-Circuit Current
Sink current, V
CC
= 5V 60 mA
Source current, V
BATT
> 2V 10 30 120 µA
RESETIN (MAX16036/MAX16040)
RESETIN Threshold V
RTH
1.185 1.235 1.285 V
RESETIN Input Current 0.01 25 nA
RESETIN to Reset Delay (V
RTH
+ 100mV) to (V
RTH
- 100mV) 1.5 µs
CHIP-ENABLE GATING (MAX16033–MAX16036)
CEIN Leakage Current RESET asserted ±1 µA
CEIN to CEOUT Resistance
RESET not asserted, V
CC
= V
TH(MAX),
V
CEIN
= V
CC
/2, I
SINK
= 10mA
100 Ω
CEOUT Short-Circuit Current RESET asserted, V
CEOUT
= 0V 1 2.0 mA
CEIN to CEOUT Propagation
Delay (Note 4)
50Ω source impedance driver,
C
LOAD
= 50pF
V
CC
= 4.75V 1.5 7
ns
V
CC
= 3.15V 2 9
CEOUT Output-Voltage High
V
CC
= 5V, V
CC
> V
BATT
, I
SOURCE
= 100µA 0.7 x V
CC
V
V
CC
= 0V, V
BATT
> 2.2V, I
SOURCE
= 1µA V
BATT
- 0.1
RESET to CEOUT Delay 1 µs
MAX16033–MAX16040 Low-Power Battery-Backup
Circuits in Small μDFN Packages
www.maximintegrated.com
Maxim Integrated │ 4
Electrical Characteristics (continued)