ST72344S4 STMicroelectronics, ST72344S4 Datasheet - Page 210

• Manufacturer Part Number: ST72344S4
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST72344S4

• Up To 16 Kbytes Program Memory: single voltage extended Flash (XFlash) with readout and write protection, in-circuit and inapplication programming (ICP and IAP). 10K write/erase cycles guaranteed, data retention
• 256 Bytes Data Eeprom With Readout Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: crystal/ceramic resonator oscillators, high-accuracy internal RC oscillator or external clock
• 5 Power-saving Modes: Slow, Wait, Halt, Auto-wakeup from Halt and Active-halt
• 16-bit Timer A With: 1 input capture, 1 output compares, external clock input, PWM and pulse generator modes
• 16-bit Timer B With: 2 input captures, 2 output compares, PWM and pulse generator modes

Electrical characteristics
13.6.1
210/247
Table 97.
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 is based on characterization results
with specified typical external components. In the application, the resonator and the load
capacitors have to be placed as close as possible to the oscillator pins in order to minimize
output distortion and startup stabilization time. Refer to the crystal/ceramic resonator
manufacturer for more details (frequency, package, accuracy, etc.).
Table 98.
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with
2. Data based on characterisation results, not tested in production. The relatively low value of the RF
3. For C
f
t
f
R
C
C
i
Symbol
2
AWU
RCSRT
OSC
F
L1
L2
Symbol
small R
resistor, offers a good protection against issues resulting from use in a humid environment, due to the
induced leakage and the bias condition change. However, it is recommended to take this point into
account if the µC is used in tough humidity conditions.
designed for high-frequency applications and selected to match the requirements of the crystal or
resonator. C
capacitance which is the series combination of C
included when sizing C
capacitance).
L1
S
Oscillator frequency
Feedback resistor
Recommended load capacitance versus
equivalent serial resistance of the
crystal or ceramic resonator (R
OSC2 driving current
and C
value. Refer to crystal/ceramic resonator manufacturer for more details.
Auto-wakeup from Halt oscillator (AWU) characteristics
Crystal/ceramic resonator oscillator characteristics
AWU oscillator frequency
AWU oscillator startup time
L1
L2
and C
it is recommended to use high-quality ceramic capacitors in the 5-pF to 25-pF range (typ.)
L2,
L1
are usually the same size. The crystal manufacturer typically specifies a load
Parameter
Parameter
and C
(2)
(1)
L2
Doc ID 12321 Rev 5
(10 pF can be used as a rough estimate of the combined pin and board
S
)
(3)
L1
Conditions
and C
See
f
CL1 = CL2 = 68 pF
f
CL1 = CL2 = 68 pF
f
CL1 = CL2 = 40 pF
f
CL1 = CL2 = 20 pF
OSC
OSC
OSC
OSC
L2
. PCB and MCU pin capacitance must be
= 2 MHz, C0 = 6 pF,
= 4 MHz, C0 = 6 pF,
= 8 MHz, C0 = 6 pF,
= 16 MHz, C0 = 7 pF,
Table 99
Conditions
Min
50
below
Typ
125
ST72344xx ST72345xx
Min
426
425
456
660
20
1
Max
250
50
Max
16
40
Unit
kHz
µs
MHz
Unit
µA
kΩ
pF