STM6321_09 Datasheet, PDF (22/29 Pages) STMicroelectronics – 5-pin supervisor with watchdog timer and push-button reset

DC and AC parameters
STM6321/6322STM6821/6822/6823/6824/6825
Table 6. DC and AC characteristic (continued)
Sym
Alter-
native
Description
Test condition ⁽¹⁾
Min Typ Max Unit
Reset threshold
temperature coefficient
40
ppm/C
Push-button reset input
t_MLMH
t_MLRL
t_MR
t_MRD
MR pulse width
MR to RST output delay
MR glitch immunity
MR pull-up resistor
1
µs
500
ns
100
ns
35
52
75
kΩ
Watchdog timer
t_WD ⁽⁶⁾
Watchdog timeout period
WDI pulse width⁽⁷⁾
V_CC ≥ 3.0 V
1.12 1.60 2.24
s
50
ns
1. Valid for ambient operating temperature: T_A = –40 to 85°C; V_CC = 4.5 to 5.5 V for “L/M” versions; V_CC = 2.7 to 3.6 V for
“T/S/R” versions; and V_CC = 1.2 to 2.75 V for “Z/Y” version (except where noted).
2. V_CC (min) = 1.0 V for T_A = 0 to +85°C.
3. WDI input is designed to be driven by a three-state output device. To float WDI, the “high-impedance mode” of the output
device must have a maximum leakage current of 10 µA and a maximum output capacitance of 200 pF. The output device
must also be able to source and sink at least 200 µA when active.
4. WDI is internally serviced within the watchdog period if WDI is left unconnected.
5. The leakage current measured on the RST pin is tested with the reset asserted (output high impedance).
6. Other t_rec and watchdog timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
7. For V_CC < 3.0 V, t_WD(min) = 100 ns.
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