ST72F321 STMICROELECTRONICS [STMicroelectronics], ST72F321 Datasheet - Page 141

• Manufacturer Part Number: ST72F321
• Description: 64/44-PIN 8-BIT MCU WITH 32 TO 60K FLASH/ROM, ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

OPERATING CONDITIONS (Cont’d)
12.3.2 Operating Conditions with Low Voltage Detector (LVD)
Subject to general operating conditions for V
Notes:
1. Data based on characterization results, tested in production for ROM devices only.
2. When Vt
V
3. If the medium or low thresholds are selected, the detection may occur outside the specified operating voltage range.
Below 3.8V, device operation is not guaranteed.
V
V
V
Vt
t
IT+(LVD)
g(VDD)
Symbol
IT+(LVD)
IT-(LVD)
hys(LVD)
POR
threshold.
POR
Reset release threshold
(V
Reset generation threshold
(V
LVD voltage threshold hysteresis
V
V
by LVD
DD
DD
DD
DD
is faster than 100 µs/V, the Reset signal is released after a delay of max. 42µs after V
rise time
glitches filtered (not detected)
rise)
fall)
1)
Parameter
1)2)
1)
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
V
LVD enabled
DD
IT+(LVD)
, f
CPU
-V
Conditions
, and T
IT-(LVD)
A
.
3)
3)
3)
3)
3.55
2.95
3.35
4.0
2.8
Min
150
3.8
6
1)
1)
1)
1)
1)
Typ
3.75
3.15
3.55
200
4.0
4.2
3.0
4.25
3.15
20000
3.35
3.75
Max
4.0
250
DD
4.5
40
1)
1)
1)
ST72321
1)
1)
crosses the
141/189
µs/V
Unit
mV
ns
V