ꢀ ꢁꢂꢃ ꢄ ꢅ ꢆ ꢇ ꢄ ꢆ ꢈ ꢀ ꢁꢂꢃ ꢄ ꢅ ꢆ ꢇ ꢃ ꢆ ꢈ ꢀ ꢁꢂꢃ ꢄꢅ ꢆꢇꢃ ꢆꢇ
ꢀ ꢉꢊꢋ ꢌ ꢁꢉ ꢍ ꢎꢏꢐ ꢀ ꢉꢑꢒꢓ ꢑꢓ ꢎꢔ ꢒꢓ ꢐꢐ ꢋꢒ
SLAS272F − JULY 2000 − REVISED JUNE 2004
electrical characteristics over recommended operating free-air temperature (unless otherwise
noted) (continued)
PUC/POR
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
250
1.8
UNIT
µs
V
t
Internal time delay to release POR
150
(POR_Delay)
T
= −40°C
= 25°C
= 85°C
1.4
1.1
0.8
A
V
threshold at which POR
CC
T
A
1.5
V
release delay time begins
(see Note 1)
V
POR
V
CC
= 2.2 V/3 V
T
A
1.2
V
V
threshold required to
CC
V
V
|dV/dt| ≥ 1V/ms
0.2
2
V
(min)
CC
generate a POR (see Note 2)
RST/NMI low time for PUC/POR
rise time dV/dt ≥ 1V/ms.
t
Reset is accepted internally
µs
(reset)
NOTES: 1. V
CC
2. When driving V
low in order to generate a POR condition, V should be driven to 200mV or lower with a dV/dt equal to or less
CC
CC
than −1V/ms. The corresponding rising V
CC
must also meet the dV/dt requirement equal to or greater than +1V/ms.
V
VCC
V
POR
No POR
POR
POR
V
(min)
t
Figure 10. Power-On Reset (POR) vs Supply Voltage
2
1.8
1.6
1.4
1.2
1
1.8
1.4
1.5
1.2
0.8
1.2
0.8
0.6
0.4
0.2
0
25°C
−40
−20
20
40
60
80
0
T
A
− Temperature − °C
Figure 11. V
vs Temperature
POR
31
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