ST72321B STMICROELECTRONICS [STMicroelectronics], ST72321B Datasheet - Page 158

• Manufacturer Part Number: ST72321B
• Description: 64/44-pin 8-bit MCU with 32 to 60K Flash/ROM, ADC, five timers, SPI, SCI, I2C interface
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

12.9 CONTROL PIN CHARACTERISTICS
12.9.1 Asynchronous RESET Pin
Subject to general operating conditions for V
Notes:
1. Data based on characterization results, not tested in production.
2. Hysteresis voltage between Schmitt trigger switching levels.
3. The I
(I/O ports and control pins) must not exceed I
4. To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses applied on
the RESET pin with a duration below t
5. The reset network (the resistor and two capacitors) protects the device against parasitic resets, especially in noisy en-
vironments.
6. Data guaranteed by design, not tested in production.
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t
w(RSTL)out
t
t
Symbol
h(RSTL)in
g(RSTL)in
R
V
V
V
V
I
hys
IO
ON
OL
IH
IL
IO
current sunk must always respect the absolute maximum rating specified in
Input low level voltage
Input high level voltage
Schmitt trigger voltage hysteresis
Output low level voltage
Input current on RESET pin
Weak pull-up equivalent resistor
Generated reset pulse duration
External reset pulse hold time
Filtered glitch duration
Parameter
1)
5)
1)
3)
h(RSTL)in
4)
VSS
2)
can be ignored.
.
DD
V
Stretch applied on
external pulse
Internal reset sources
, f
DD
CPU
=5V
Conditions
, and T
I
IO
=+2mA
A
unless otherwise specified.
0.7xV
Min
2.5
20
20
0
DD
Section 12.2.2
Typ
2.5
0.2
200
30
30
2
0.3xV
and the sum of I
Max
120
42
42
0.5
6)
6)
DD
Unit
mA
kΩ
µs
µs
µs
ns
V
V
IO