MAX793 Maxim, MAX793 Datasheet - Page 4

• Manufacturer Part Number: MAX793
• Description: 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
MAX793R/MAX794/MAX795R, V
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
Note 1: V
Note 2: Tested at V
Note 3: Leakage current into the battery is tested under the worst-case conditions at V
Note 4: Guaranteed by design.
Note 5: When V
Note 6: When V
Note 7: OUT switches from BATT to V
Note 8: The reset threshold tolerance is wider for V
Note 9: The leakage current into or out of the RESET pin is tested with RESET not asserted (RESET output high impedance).
Note 10: PFO is normally an output, but is used as an input when activating the battery freshness seal.
4
MANUAL RESET INPUT
CHIP-ENABLE GATING
WATCHDOG (MAX793/MAX794 only)
Resistance
Propagation Delay
High (reset active)
RESET Output Voltage Low
BATT ON Output
Voltage Low
All Inputs Including PFO
(Note 10)
MR Pulse Width
MR-to-Reset Delay
MR Pull-Up Current
CE IN Leakage Current
CE IN-to-CE OUT
CE IN-to-CE OUT
CE OUT Drive from CE IN
Reset to CE OUT High Delay
CE OUT Output Voltage
WDI Input Current
Watchdog Timeout Period
WDI Pulse Width
CC
_______________________________________________________________________________________
= 3.17V to 5.5V for the MAX793T/MAX795T, V
PARAMETER
PFI functionality (MAX793/MAX794), state of RESET and RESET (MAX793/MAX794) tested at V
The state of RESET is tested at V
V
V
has a small 15mV typical hysteresis to prevent oscillation. For V
V
to V
V
which prevents internal oscillation.
CC
CC
BATT
BATT
BATT
CC
supply current, logic input leakage, watchdog functionality (MAX793/MAX794), MR functionality (MAX793/MAX794),
= 1.9V.
.
= 1.0V.
< V
occurs at the exact voltage that causes reset to be asserted, however switchover occurs 200ms prior to reset. If
SW
BATT
RST
> V
BATT
> V
, OUT switches from BATT to V
CC
CC
= 3.6V, V
> V
> V
SYMBOL
BATT
BATT
I
SW
LEAK
V
V
V
V
V
t
t
t
V
V
WD
MR
MD
OH
OH
OL
OL
OL
IH
IL
CC
, OUT remains connected to V
, OUT remains connected to V
= 3.6V, T
= 3.5V and 0V. The battery current will rise to 10µA over a narrow transition window around
CC
MAX79_C, V
MAX79_E, V
I
V
MAX793/MAX794 only
MAX793/MAX794 only
MAX793/MAX794 only, MR = 0V
Disable mode
Enable mode, V
V
V
V
V
V
I
0V < V
CC
when V
SINK
OH
RST
CC
CC
CC
CE IN
CE IN
= V
A
= 500µA, V
= V
= V
= V
max < V
= 3.2mA, V
= T
CC
CC
= V
= 0V
CC
RST
RST
RST
MIN
CC
< 5.5V
min.
rises above the reset threshold, if V
CC
CC
BATT
CC
BATT
max, Figure 9
max, I
max, I
rising than for V
to T
CC
CONDITIONS
= 3.02V to 5.5V for the MAX793S/MAX795S, V
when V
CC
CC
CC
= V
MAX
< 5.5V
= V
OUT
OUT
< 2.3V
= V
= V
CC
CC
, unless otherwise noted. Typical values are at T
CC
RST
= -1mA,
= 1.6mA,
= 1.2V, I
RST
CC
CC
= 1.0V, I
exceeds V
max
until V
until V
max
CC
CC
SINK
SINK
falling to accommodate the 10mV typical hysteresis,
CC
CC
< 1.75V (typical), OUT switches to BATT regardless of
= 200µA
BATT
drops below V
drops below the battery switch threshold (V
= 40µA
.
0.8V
CC
0.3V
0.8V
BATT
1.00
1.00
MIN
100
25
-1
= 5.5V, V
BATT
CC
CC
BATT
> V
RST
. The V
BATT
. In this case, switchover back
TYP
0.13
0.17
0.01
1.60
±10
BATT
50
75
70
46
10
2
CC
CC
= 1.8V and V
-to-V
= 3.6V and V
= 2.72V to 5.5V for the
A
BATT
= +25°C.)
0.2V
0.7V
0.2V
MAX
2.25
250
250
0.3
0.3
comparator
7
1
CC
CC
CC
CC
= 1.5V,
CC
SW
).
UNITS
= 5.5V.
sec
µA
nA
µA
ns
ns
ns
µs
ns
Ω
V
V
V
V
V