3
LTC1232
sn1232 1232fas
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage ● 4.5 5 5.5 V
V
IH
ST and PB RST Input High Level ● 2V
CC
+0.3 V
V
IL
ST and PB RST Input Low Level ● –0.3 0.8 V
DC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
IL
Input Leakage (Note 3) ● –1 1 µA
I
OH
Output Current at 2.4V (Note 5) ● –1 –13 mA
I
OL
Output Current at 0.4V (Note 5) ● 26 mA
I
CC
Supply Current (Note 4) ● 0.5 2 mA
V
CCTP
V
CC
Trip Point TOL = GND ● 4.5 4.62 4.74 V
V
CCTP
V
CC
Trip Point TOL = V
CC
● 4.25 4.37 4.49 V
V
HYS
V
CC
Trip Point Hysteresis 40 mV
V
RST
RST Output Voltage at V
CC
= 1V I
SINK
= 10µA 4 200 mV
The ● denotes the specifications which apply
over the full operating temperature. V
CC
= full operating range.
The ● denotes the specifications which apply over the full operating
temperature. V
CC
= full operating range.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PB
PB RST = V
IL
● 40 ms
t
RST
RESET Active Time ● 250 610 1000 ms
t
ST
ST Pulse Width ● 20 ns
t
RPD
V
CC
Detect to RST and RST ● 100 ns
t
f
V
CC
Slew Rate 4.75V–4.25V ● 300 µs
t
RPU
V
CC
Detect to RST and RST t
R
= 5µs ● 250 610 1000 ms
(Reset Active Time)
t
R
V
CC
Slew Rate 4.25V–4.75V ● 0ns
t
TD
ST Pin Detect to RST and RST TD = GND ● 60 150 250 ms
(Watchdog Time-Out Period) TD = Floating
● 250 610 1000 ms
TD = V
CC
● 500 1200 2000 ms
C
IN
Input Capacitance 5pF
C
OUT
Output Capacitance 5 pF
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to GND.
Note 3: The PB RST pin is internally pulled up to V
CC
with an internal
impedance of 10k typical. The TD pin has internal bias current.
Note 4: Measured with outputs open.
Note 5: The RST pin is an open drain output.
The ● denotes the specifications which apply over the full operating temperature.
V
CC
= full operating range.
AC CHARACTERISTICS
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