Datasheet

MAX792/MAX820
4 _______________________________________________________________________________________
Microprocessor and Nonvolatile
Memory Supervisory Circuits
Note 1: The minimum operating voltage is 2.75V; however, the MAX792R and MAX820R are guaranteed to operate down to their
preset reset thresholds.
Note 2: Pulling RESET IN/INT below 60mV selects internal threshold mode and connects the internal voltage divider to the reset
and low-line comparators. External programming mode allows an external resistor divider to set the low-line and reset
thresholds (see Figure 4).
Note 3: The Chip-Enable Propagation delay is measured from the 50% point at CE IN to the 50% point at CE OUT.
PARAMETER
CONDITIONS
V
CC
= 5V or V
CC
= 3V
MIN TYP MAX UNITS
I
SINK
= 3.2mA
I
SOURCE
= 1µA
Output source current, V
CC
= 5.5V
V
OD
= 100mV, OVI rising
MR Pull-Up Current
V
IH
0.75 x V
CC
MR = 0V
V
CC
= 2.5V
V
CC
= 4.25V
V
IL
0.8
1
V
IH
0.75 x V
CC
CE IN Threshold Voltage
V
CC
= 2.55V
V
IL
0.2
V
CE IN Leakage Current
50Ω source impedance driver,
C
LOAD
= 50pF
Disabled mode ±0.005 ±1 µA
V
CC
= 5V
V
CC
= 3V
V
CC
= 5V 75 150
610
CE IN to CE OUT Resistance
OVI Input Threshold
Enabled mode
V
CC
= 3V 150 300
1.25 1.30 1.35 V
OVI Leakage Current
Ω
±0.01 ±25 nA
V
CC
= 5V 0.5 2.5
CE OUT Short-Circuit Current
0.4
OVO Output Voltage
Disabled mode, CE
OUT
= 0V
V
CC
= 3V 0.05 0.2 0.4
V
CC
- 1
V
mA
Chip-Enable Propagation Delay
(Note 3)
10 50
813
ns
I
OUT
= -100µA V
CC
- 1
Chip-Enable Output Voltage
High (Reset Active)
I
OUT
= 10µA V
CC
- 0.5
V
Reset Active to CE OUT High
V
CC
falling 15 µs
MR Minimum Pulse Width
25 µs
MR to RESET Propagation Delay
12 µs
MR Threshold Range
1.1 1.3 1.5 V
V
CC
= 4.25V
to V
CC
= 5.5V
52380
µA
OVO Short-Circuit Current
µA
13
OVI to OVO Delay
V
OD
= 100mV, OVI falling 55
µs
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.75V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
MANUAL RESET
CHIP-ENABLE GATING
OVERVOLTAGE COMPARATOR