ST72321XX Datasheet, PDF (189/243 Pages) STMicroelectronics – PLL for 2x frequency multiplication

ST72321xx-Auto
Electrical characteristics
19.3.2
Operating conditions with low voltage detector (LVD)
Subject to general operating conditions for V_DD, f_CPU, and T_A.
Table 108. Operating conditions with low voltage detector (LVD)
Symbol
Parameter
Conditions
Min
Typ
Max Unit
V_IT+(LVD)
Reset release threshold
(V_DD rise)
V_IT-(LVD)
Reset generation threshold
(V_DD fall)
VD level = High in option byte
VD level = Med. in option byte⁽²⁾
VD level = Low in option byte⁽²⁾
VD level = High in option byte
VD level = Med. in option byte⁽²⁾
VD level = Low in option byte⁽²⁾
4.0⁽¹⁾
3.55⁽¹⁾
2.95⁽¹⁾
3.8
3.35⁽¹⁾
2.8⁽¹⁾
4.2
3.75
3.15
4.0
3.55
3.0
4.5
4.0⁽¹⁾
3.35⁽¹⁾
V
4.25⁽¹⁾
3.75⁽¹⁾
3.15⁽¹⁾
V_hys(LVD)
LVD voltage threshold
hysteresis
Vt_POR V_DD rise time⁽²⁾⁽³⁾
t_g(VDD)
V_DD glitches filtered (not
detected) by LVD⁽⁴⁾
V_IT+(LVD)-V_IT-(LVD)
LVD enabled
6µs/V
200
mV
100ms/V -
40
ns
1. Data based on characterization results, tested in production for ROM devices only
2. Data based on characterization results, not tested in production
3. When Vt_POR is faster than 100µs/V, the Reset signal is released after a delay of maximum 42µs after V_DD crosses the
V_IT+(LVD) threshold.
4. 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.
19.3.3
Auxiliary voltage detector (AVD) thresholds
Subject to general operating conditions for V_DD, f_CPU, and T_A.
Table 109. Auxiliary voltage detector (AVD) thresholds
Symbol
Parameter
Conditions
V_IT+(AVD)
10 AVDF flag toggle threshold
(V_DD rise)
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
V_IT-(AVD)
01 AVDF flag toggle threshold
(V_DD fall)
VD level = High in option byte
VD level = Med. in option byte
VD level = Low in option byte
V_hys(AVD) AVD voltage threshold hysteresis V_IT+(AVD)-V_IT-(AVD)
V_IT-
Voltage drop between AVD flag set
and LVD reset activated
V_IT-(AVD)-V_IT-(LVD)
1. Data based on characterization results, tested in production for ROM devices only
Min
4.4⁽¹⁾
3.95⁽¹⁾
3.4⁽¹⁾
4.2⁽¹⁾
3.75⁽¹⁾
3.2⁽¹⁾
Typ
4.6
4.15
3.6
4.4
4.0
3.4
200
450
Max Unit
4.9⁽¹⁾
4.4⁽¹⁾
3.8⁽¹⁾
V
4.65⁽¹⁾
4.2⁽¹⁾
3.6⁽¹⁾
mV
Doc ID 13829 Rev 1
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