Datasheet

DS1705/DS1706
9 of 12
AC ELECTRICAL CHARACTERISTICS (V
CC
= 1.2V to 5.5V, T
A
= -40C to +85C.)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
PBRST = V
IL
t
PB
150 ns
Reset Active Time t
RST
130 205 285 ms
ST Pulse Width
t
ST
10 ns 6
V
CC
Detect to RST and RST
t
RPD
5 8
s
9
V
CC
Slew Rate t
F
20
s
V
CC
Detect to RST and RST
t
RPU
130 205 285 ms 7
V
CC
Slew Rate t
R
0 ns
PBRST Stable Low to RST and RST
t
PDLY
250 ns
Watchdog Timeout t
TD
1.0 1.6 2.2 s 8
VIN Detect to NMI
t
IPD
5 8
s
9
NOTES:
1. All voltages are referenced to ground.
2. PBRST is internally pulled up to V
CC
with an internal impedance of 40 ktypical and the ST input is
internally pulled up to V
CC
with an internal impedance of 180 ktypical.
3. V
CC
≥ 2.4V.
4. V
CC
< 2.4V.
5. Measured with outputs open and all inputs at V
CC
or ground.
6. Must not exceed t
TD
minimum.
7. t
R
= 5 s.
8. Minimum watchdog time-out tested at 2.7V for the 3.3V devices and 4.5V for the 5.0V devices.
9. Noise immunity  pulses < 2 s will not cause a reset.