Datasheet

(MAX691A, MAX800L: V
CC
= +4.75V to +5.5V; MAX693A, MAX800M: V
CC
= +4.5V to +5.5V; V
VBATT
= 2.8V, T
A
= T
MIN
to T
MAX
,
unless otherwise noted.
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), dis-
abling 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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
POWER-FAIL COMPARATOR
PFI Input Threshold
MAX69_AC/AE/AM, V
CC
= 5V 1.2 1.25 1.3
V
MAX800_C/E, V
CC
= 5V 1.225 1.25 1.275
PFI Leakage Current ±0.01 ±25 nA
PFO Output Voltage
I
SINK
= 3.2mA 0.4
V
I
SOURCE
= 1μA, V
CC
= 5V 3.5
PFO Output Short-Circuit
Current
Output source current 1 15 100 µA
PFI-to-PFO Delay
V
IN
= -20mV, V
OD
= 15mV 25
µs
V
IN
= 20mV, V
OD
= 15mV 60
CHIP-ENABLE GATING
CE IN Leakage Current Disable mode ±0.005 ±1 μA
CE IN-to- CE OUT
Resistance (Note 7)
Enable mode 75 150 Ω
CE OUT Short-Circuit
Current (Reset Active)
Disable mode, CE OUT = 0V 0.1 0.75 2.0 mA
CE IN-to- CE OUT
Propagation Delay (Note 8)
50Ω source impedance driver, C
LOAD
= 50pF 6 10 ns
CE OUT Output-Voltage
High (Reset Active)
V
CC
= 5V, I
OUT
= -100μA 3.5
V
V
CC
= 0V, VBATT = 2.8V, I
OUT
= 1μA 2.7
RESET-to-CE OUT Delay Power-down 12 µs
INTERNAL OSCILLATOR
OSC IN Leakage Current OSC SEL = 0V 0.10 ±5 µA
OSC IN Input Pullup Current OSC SEL = V
OUT
or oating, OSC IN = 0V 10 100 μA
OSC SEL Input Pullup
Current
OSC SEL = 0V 10 100 μA
OSC IN Frequency Range OSC SEL = 0V 50 kHz
OSC IN External Oscillator
Threshold Voltage
V
IH
V
OUT
-
0.3
V
OUT
-
0.6
V
V
IL
3.65 2.00
OSC IN Frequency with
External Capacitor
OSC SEL = 0V, COSC = 47pF 100 kHz
MAX691A/MAX693A/
MAX800L/MAX800M
Microprocessor Supervisory Circuits
www.maximintegrated.com
Maxim Integrated │ 4
Electrical Characteristics (continued)