ST72C334N2T6 STMicroelectronics, ST72C334N2T6 Datasheet - Page 108

• Manufacturer Part Number: ST72C334N2T6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2T6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-64
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: In Transition

ST72334J/N, ST72314J/N, ST72124J
8.5 I/O PORT CHARACTERISTICS
Recommended operating conditions
with T
Notes:
1) Unless otherwise specified, typical data are based on T
lines and are not tested.
2) Data based on design simulation and/or technology characteristics, not tested in production.
3) Hysteresis voltage between Schmitt trigger switching levels. Based on characterization results, not tested.
4) Data based on characterization results, not tested in production.
5) Positive injection (I
The I
The true open-drain pins do not accept positive injection. In this case the maximum voltage rating must be respected.
6) ADC accuracy reduced by negative injection (I
The I
leakage (a few A) induced inside the die when a negative injection is performed. This leakage is tolerated by the digital
structure, but it acts on the analog line depending on the impedance versus a leakage current of a few A (if the MCU
has an AD converter). The effect depends on the pin which is submitted to the injection. Of course, external digital signals
applied to the component must have a maximum impedance close to 50K .
Location of the negative current injection:
- Pins with analog input capability are the most sensitive. I
analog voltage is lower than 25K )
- Pure digital pins can tolerate 1.6mA. In addition, the best choice is to inject the current as far as possible from the analog
input pins.
7) When several inputs are submitted to a current injection, the maximum I
rents (instantaneous values). These results are based on characterisation with I
O port pins of the device.
8) To generate an external interrupt, a minimum pulse width has to be applied on an I/O port pin configured as an external
interrupt source.
108/125
I/O PORT PINS
Symbol
t
V
V
I
t
t
ITEXT
V
R
V
I
V
I
PINJ
OHL
OLH
HYS
INJ
I
SV
OH
INJ-
OL
PU
INJ+
L
IL
IH
A
=-40 to +85
is performed through protection diodes NOT INSULATED from the substrate of the die. The drawback is a small
is performed through protection diodes insulated from the substrate of the die.
Input low level voltage
Input high level voltage
Schmitt trigger voltage hysteresis
Output low level voltage
for Standard I/O port pins
Output low level voltage
for high sink I/O port pins
Output high level voltage
Pull-up equivalent resistor
Input leakage current
Static current consumption
Single pin injected current
Total injected current
(sum of all I/O and control pins)
Output high to low level fall time
Output low to high rise time
External interrupt pulse time
INJ+
o
C and 4.5V<V
Parameter
)
7)
2)
2)
DD
2)
8)
-V
SS
3)
<5.5V unless otherwise specified.
INJ-
Positive
Negative
Positive: V
Negative: V
Floating input mode
3V<V
)
V
SS
Conditions
A
V
V
5)
=25 C and V
I=-20mA
INJ-
C
DD
I=-5mA
I=-2mA
I=-8mA
I=-5mA
I=-2mA
<V
6)
IN
IN
: V
l
EXT
=50pF
: V
EXT
-V
PIN
> V
< V
maximum is 0.8 mA (assuming that the impedance of the
EXT
EXT
SS
>V
<V
<V
IH
IL
>V
<5.5V
DD
<V
DD
SS
DD
SS
DD
-V
INJ
SS
is the sum of the positive (or negative) cur-
0.7xV
V
V
=5V. They are given only as design guide-
14.8
14.4
DD
DD
Min
INJ
20
60
1
-2.0
-0.8
maximum current injection on four I/
DD
4)
4)
Typ
400
100
35
25
25
1)
0.3xV
45.6
45.9
Max
140
200
1.3
0.5
1.3
0.5
tbd
tbd
50
-5
1
5
4)
4)
DD
Unit
t
mV
mA
CPU
k
ns
V
V
A