ST7263 STMICROELECTRONICS [STMicroelectronics], ST7263 Datasheet - Page 98

• Manufacturer Part Number: 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
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST7263
7.6 LOW VOLTAGE DETECTOR (LVD) CHARACTERISTICS
7.7 CONTROL TIMING CHARACTERISTICS
(Operating conditions T
Note 1: The minimum period t
C
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LOW VOLTAGE RESET Electrical Specifications
CONTROL TIMINGS
Symbol
Symbol
t
T
t
OXOV
f
f
t
t
V
PORL
V
V
DOGL
DOG
OSC
CPU
t
DDR
RL
hys
IT+
IT-
interrupt service routine plus 21 cycles.
Oscillator Frequency
Operating Frequency
External RESET
Input pulse Width
Internal Power Reset Duration
Watchdog & Low Voltage Reset
Output Pulse Width
Watchdog Time-out
Crystal Oscillator
Start-up Time
Power up rise time
Low Voltage Reset Threshold
Low Voltage Reset Threshold
Hysteresis (V
Parameter
Parameter
V
V
A
DD
DD
= 0 to +70°C unless otherwise specified)
falling
rising
IT+
ILIL
- V
should not be less than the number of cycle times it takes to execute the
IT-
)
f
from V
cpu
= 8MHz
V
V
Conditions
DD
DD
DD
Conditions
Max. Variation
Max. Variation
= 0 to 4V
50mV/ s
50mV/ s
49152
4096
Min
200
1.5
6
Min
200
3.6
3.2
Value
Typ.
3.75
Typ
250
3.5
3145728
Max
384
100
24
50
8
Max
4.0
3.7
MHz
MHz
Unit
t
t
t
ms
ms
ms
CPU
CPU
CPU
Unit
ns
mV
V
V