Microprocessor Supervisory Circuits
MAX691A/MAX693A/MAX800L/MAX800M
ELECTRICAL CHARACTERISTICS (continued)
(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V, MAX693A, MAX800M: V
CC
= +4.5V to +5.5V, VBATT = 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.)
PARAMETER
POWER-FAIL COMPARATOR
PFI Input Threshold
PFI Leakage Current
PFO
Output Voltage
PFO
Output Short-Circuit
Current
PFI-to-PFO Delay
CHIP-ENABLE GATING
CE
IN Leakage Current
CE
IN-to-CE OUT Resistance
(Note 7)
CE
OUT Short-Circuit Current
(Reset Active)
CE
IN-to-CE OUT Propagation
Delay (Note 8)
CE
OUT Output Voltage High
(Reset Active)
RESET-to-CE OUT Delay
INTERNAL OSCILLATOR
OSC IN Leakage Current
OSC IN Input Pull-Up Current
OSC SEL Input Pull-Up Current
OSC IN Frequency Range
OSC IN External Oscillator
Threshold Voltage
OSC IN Frequency with
External Capacitor
OSC SEL = 0V
OSC SEL = V
OUT
or floating, OSC IN = 0V
OSC SEL = 0V
OSC SEL = 0V
V
IH
V
IL
OSC SEL = 0V, COSC = 47pF
V
OUT
- 0.3
0.10
10
10
50
V
OUT
- 0.6
3.65
100
2.00
±5
100
100
µA
µA
µA
kHz
V
kHz
Disable mode
Enable mode
–
Disable mode,
CE
OUT = 0V
50Ω source impedance driver, C
LOAD
= 50pF
V
CC
= 5V, I
OUT
= -100µA
V
CC
= 0V, VBATT = 2.8V, I
OUT
= 1µA
Power-down
3.5
2.7
12
0.1
±0.005
75
0.75
6
±1
150
2.0
10
µA
Ω
mA
ns
V
µs
I
SINK
= 3.2mA
I
SOURCE
= 1µA, V
CC
= 5V
Output source current
V
IN
= -20mV, V
OD
= 15mV
V
IN
= 20mV, V
OD
= 15mV
3.5
1
15
25
60
100
MAX69_AC/AE/AM, V
CC
= 5V
MAX800_C/E, V
CC
= 5V
1.2
1.225
1.25
1.25
±0.01
1.3
1.275
±25
0.4
V
nA
V
µA
µs
CONDITIONS
MIN
TYP
MAX
UNITS
Note 1:
Either V
CC
or VBATT can go to 0V, if the other is greater than 2.0V.
Note 2:
The supply current drawn by the MAX691A/MAX800L/MAX800M from the battery excluding I
OUT
typically goes to 10µA
when (VBATT - 1V) < V
CC
< VBATT. In most applications, this is a brief period as V
CC
falls through this region.
Note 3:
“+” = battery-discharging current, “--” = battery-charging current.
Note 4:
Although presented as typical values, the number of clock cycles for the reset and watchdog timeout periods are fixed and
do not vary with process or temperature.
Note 5:
RESET is an open-drain output and sinks current only.
Note 6:
WDI is internally connected to a voltage divider between V
OUT
and GND. If unconnected, WDI is driven to 1.6V (typ),
disabling the watchdog function.
Note 7:
The chip-enable resistance is tested with V
CC
= +4.75V for the MAX691A/MAX800L and V
CC
= +4.5V for the
MAX693A/MAX800M.
CE
IN =
CE
OUT = V
CC
/ 2.
Note 8:
The chip-enable propagation delay is measured from the 50% point at
CE
IN to the 50% point at
CE
OUT.
4
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