ST72F264G ST Microelectronics, ST72F264G Datasheet - Page 147

• Manufacturer Part Number: ST72F264G
• Description: (ST72F260G - ST72F264G) 8-BIT MCU
• Manufacturer: ST Microelectronics

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DataSheet
13.9 CONTROL PIN CHARACTERISTICS
13.9.1 Asynchronous RESET Pin
T
Figure 99. Typical Application with RESET pin
Notes:
1. Data based on characterization results, not tested in production.
2. The I
(I/O ports and control pins) must not exceed I
3. To guarantee the reset of the device, a minimum pulse has to be applied to the RESET pin. All short pulses applied on
RESET pin with a duration below t
4. The reset network protects the device against parasitic resets.
5. The output of the external reset circuit must have an open-drain output to drive the ST7 reset pad. Otherwise the device
can be damaged when the ST7 generates an internal reset (LVD or watchdog).
6. Whatever the reset source is (internal or external), the user must ensure that the level on the RESET pin can go below
the V
7. Because the reset circuit is designed to allow the internal RESET to be output in the RESET pin, the user must ensure
that the current sunk on the RESET pin (by an external pull-up for example) is less than the absolute maximum value
specified for I
t
w(RSTL)out
t
t
A
Symbol
h(RSTL)in
g(RSTL)in
Required if LVD is disabled
EXTERNAL
V
R
CIRCUIT
= -40 to +85°C unless otherwise specified
V
V
V
4
hys
OL
ON
RESET
IL
IH
IL
USER
U
max. level specified in
IO
.com
current sunk must always respect the absolute maximum rating specified in
5)
Input low level voltage
Input high level voltage
Schmitt trigger voltage hysteresis
Output low level voltage
Pull-up equivalent resistor
Generated reset pulse duration
External reset pulse hold time
Filtered glitch duration
Recommended
if LVD is disabled
INJ(RESET)
in
V
Parameter
DD
Section 13.2.2 on page
0.01 F
0.01 F
Section 13.9.1
h(RSTL)in
5)
2)
V
DD
4.7k
4)
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can be ignored.
VSS
. Otherwise the reset will not be taken into account internally.
1)
.
123.
V
V
V
Internal reset sources
V
DD
DD
DD
DD
=5V
=5V
=3V
6)7)8)
Conditions
R
ON
Filter
I
I
IO
IO
=+5mA
=+2mA
ST72260G, ST72262G, ST72264G
GENERATOR
0.85xV
PULSE
Min
20
20
DD
Section 13.2.2
0.68
0.28
Typ
2.5
200
40
85
30
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0.16xV
and the sum of I
Max
0.95
0.45
80
INTERNAL
RESET
WATCHDOG
LVD RESET
DD
ST72XXX
147/171
Unit
k
ns
V
V
V
s
s
4U
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