ST72C254G2M6 STMicroelectronics, ST72C254G2M6 Datasheet - Page 106

• Manufacturer Part Number: ST72C254G2M6
• Description: IC MCU 8BIT 8K FLASH SOIC-28
• Manufacturer: STMicroelectronics
• Series: ST7r

Specifications of ST72C254G2M6

• Core Processor: ST7
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI
• Peripherals: LVD, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 3.2 V ~ 5.5 V
• Data Converters: A/D 6x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Controller Family/series: ST7
• No. Of I/o's: 22
• Ram Memory Size: 256Byte
• Cpu Speed: 8MHz
• No. Of Timers: 2
• Rohs Compliant: Yes
• Processor Series: ST72C2x
• Core: ST7
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: I2C, SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 22
• Number Of Timers: 3 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Development Tools By Supplier: ST7MDT1-DVP2/US
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: In Transition

ST72104G, ST72215G, ST72216G, ST72254G
CLOCK AND TIMING CHARACTERISTICS (Cont’d)
14.5.3 Crystal and Ceramic Resonator Oscillators
The ST7 internal clock can be supplied with four
different Crystal/Ceramic resonator oscillators. All
the information given in this paragraph are based
on characterization results with specified typical
external components. In the application, the reso-
nator and the load capacitors have to be placed as
14.5.3.1 Typical Crystal Resonators
Figure 64. Typical Application with a Crystal Resonator
Notes:
1. Resonator characteristics given by the crystal manufacturer.
2. t
quick V
3. The oscillator selection can be optimized in terms of supply current using an high quality resonator with small R
Refer to crystal manufacturer for more details.
106/140
Config.
Option
f
R
C
C
i
2
OSC
Byte
Symbol
F
L1
L2
MP
MS
HS
LP
SU(OSC)
DD
ramp-up from 0 to 5V (<50 s).
is the typical oscillator start-up time measured between V
S-200-30-30/50
SS3-400-30-30/30
SS3-800-30-30/30
SS3-1600-30-30/30
Oscillator Frequency
Feedback resistor
Recommended load capacitance ver-
sus equivalent serial resistance of the
crystal or ceramic resonator (R
OSC2 driving current
Reference
C
L2
Parameter
C
L1
3)
16MHz
Freq.
2MHz
4MHz
8MHz
RESONATOR
S
)
f
f
f
f
OSC
OSC
OSC
OSC
=[±30ppm
=[±30ppm
=[±30ppm
=[±30ppm
LP: Low power oscillator
MP: Medium power oscillator
MS: Medium speed oscillator
HS: High speed oscillator
R
R
R
R
V
V
OSC1
OSC2
S
S
S
S
DD
IN
=200
=200
=200
=100
=V
=5V
SS
25°C
25°C
25°C
25°C
close as possible to the oscillator pins in order to
minimize output distortion and start-up stabiliza-
tion time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, pack-
age, accuracy...).
Characteristic
Conditions
R
,±30ppm
,±30ppm
,±30ppm
,±30ppm
F
DD
=2.8V and the fetch of the first instruction (with a
LP oscillator
MP oscillator
MS oscillator
HS oscillator
LP oscillator
MP oscillator
MS oscillator
HS oscillator
Ta
Ta
Ta
Ta
i
2
, Typ. R
, Typ. R
, Typ. R
, Typ. R
1)
S
S
S
S
=200
=60
=25
=15
Min
110
180
400
>2
>4
>8
20
38
32
18
15
40
1
ST72XXX
f
OSC
Max
100
190
360
700
16
40
56
46
26
21
[pF]
2
4
8
C
33
33
33
33
L1
[pF]
C
34 10~15
34
34
34
L2
S
MHz
Unit
k
pF
t
value.
[ms]
SU(osc)
2.5~3
1~1.5
A
7~10
2)