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 Pullup Current
OSC SEL Input Pullup 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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