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ST7263 Datasheet(PDF) 98 Page - STMicroelectronics

Part # ST7263
Description  LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7263 Datasheet(HTML) 98 Page - STMicroelectronics

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7.6 LOW VOLTAGE DETECTOR (LVD) CHARACTERISTICS
7.7 CONTROL TIMING CHARACTERISTICS
(Operating conditions T
A = 0 to +70°C unless otherwise specified)
Note 1: The minimum period t
ILIL should not be less than the number of cycle times it takes to execute the
interrupt service routine plus 21 cycles.
C
LOW VOLTAGE RESET Electrical Specifications
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VIT+
Low Voltage Reset Threshold
VDD rising
VDD Max. Variation
50mV/
µs
3.6
3.75
4.0
V
VIT-
Low Voltage Reset Threshold
VDD falling
VDD Max. Variation
50mV/
µs
3.2
3.5
3.7
V
Vhys
Hysteresis (VIT+ - VIT-)
200
250
mV
CONTROL TIMINGS
Symbol
Parameter
Conditions
Value
Unit
Min
Typ.
Max
fOSC
Oscillator Frequency
24
MHz
fCPU
Operating Frequency
8
MHz
tRL
External RESET
Input pulse Width
1.5
tCPU
tPORL
Internal Power Reset Duration
4096
tCPU
TDOGL
Watchdog & Low Voltage Reset
Output Pulse Width
200
ns
tDOG
Watchdog Time-out
fcpu = 8MHz
49152
6
3145728
384
tCPU
ms
tOXOV
Crystal Oscillator
Start-up Time
50
ms
tDDR
Power up rise time
from VDD = 0 to 4V
100
ms


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