STM6821 STMicroelectronics, STM6821 Datasheet - Page 22

• Manufacturer Part Number: STM6821
• Description: Reset + Watchdog
• Manufacturer: STMicroelectronics

Package mechanical data
Table 6.
1. Valid for ambient operating temperature: T
2. V
3. WDI input is designed to be driven by a three-state output device. To float WDI, the “high-impedance mode” of the output
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
7.
22/29
Push-button reset input
Watchdog timer
t
t
Sym-
t
WD
MLMH
MLRL
bol
“T/S/R” versions; and V
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.
For V
CC
(6)
(min) = 1.0 V for T
CC
native
rec
Alter-
t
t
MRD
MR
< 3.0 V, t
and watchdog timings are offered. Minimum order quantities may apply. Contact local sales office for availability.
DC and AC characteristic (continued)
Watchdog timeout period
MR to RST output delay
WD
temperature coefficient
WDI pulse width
MR glitch immunity
MR pull-up resistor
(min) = 100 ns.
Reset threshold
A
MR pulse width
CC
Description
= 0 to +85 °C.
= 1.2 to 2.75 V for “Z/Y” version (except where noted).
(7)
A
= –40 to 85 °C; V
Doc ID 11110 Rev 11
Test condition
V
CC
CC
= 4.5 to 5.5 V for “L/M” versions; V
STM6321/6322STM6821/6822/6823/6824/6825
≥ 3.0 V
(1)
1.12
Min
35
50
1
CC
1.60
Typ
500
100
40
52
= 2.7 to 3.6 V for
Max
2.24
75
ppm/
Unit
kΩ
µs
ns
ns
ns
C
s