Power-up/power-down characteristics, Figure 1. timing diagram, Figure 2. power-up/power-down timing – Rainbow Electronics DS1672 User Manual
Page 5: 40 °c to +85°c), Detect to, Falling) t, 10 µs v, Rising) t, Fall time; v, 300 ms v
DS1672
5 of 12
POWER-UP/POWER-DOWN CHARACTERISTICS
(T
A
= -40
°C to +85°C)
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
NOTES
V
CC
Detect to
RST
(V
CC
Falling)
t
RPD
10
µs
V
CC
Detect to
RST
(V
CC
Rising)
t
RPU
250
ms
11
V
CC
Fall Time; V
PF(MAX)
to V
PF(MIN)
t
F
300
ms
V
CC
Rise Time; V
PF(MIN)
to V
PF(MAX)
t
R
0
ms
Note 11: If the
EOSC
bit in the control register is set to logic 1, t
RPU
is equal to 250ms plus the startup time of the crystal oscillator.
Warning: Under no circumstances are negative undershoots, of any amplitude, allowed when device is in write
protection.
Figure 1. Timing Diagram
SCL
START
SDA
STOP
t
BUF
REPEATED
START
t
HD:STA
t
LOW
t
HD:STA
t
HD:DAT
t
SU:DAT
t
HIGH
t
SU:STA
t
F
t
SU:STO
Figure 2. Power-Up/Power-Down Timing
OUTPUTS
V
CC
V
PF(max)
INPUTS
HIGH-Z
RST
DON'T CARE
VALID
RECOGNIZED
RECOGNIZED
VALID
t
RPD
V
PF(min)
t
F
t
PD
t
R
t
RPU