Datasheet

DS1846
16 of 18
AC ELECTRICAL CHARACTERISTICS (-40°C to +85°C; V
CC
= 4.5V to 5.5V)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS NOTES
SCL Clock Frequency f
SCL
Fast mode
Standard mode
0
0
400
100
kHz 4
Bus Free Time
Between Stop and
Start Condition
t
BUF
Fast mode
Standard mode
1.3
4.7
ms
4
Hold Time (Repeated)
Start Condition
t
HD:STA
Fast mode
Standard mode
0.6
4.0
ms
4, 5
Low Period of SCL
Clock
t
LOW
Fast mode
Standard mode
1.3
4.7
ms
4
High Period of SCL
Clock
t
HIGH
Fast mode
Standard mode
0.6
4.0
ms
4
Data Hold Time t
HD:DAT
Fast mode
Standard mode
0
0
0.9
ms
4, 6, 7
Data Setup Time t
SU:DAT
Fast mode
Standard mode
100
250
ns 4
Rise Time of Both
SDA and SCL Signals
t
R
Fast mode
Standard mode
20 + 0.1C
B
300
1000
ns 8
Fall Time of Both
SDA and SCL Signals
t
F
Fast mode
Standard mode
20 + 0.1C
B
300
300
ns 8
Setup Time for Stop
Condition
t
SU:STO
Fast mode
Standard mode
0.6
4.0
ms
Pulse Width of Spikes
(which must be suppressed
by input filter
)
t
SP
Fast mode 0 50 ns
Capacitive Load for
each Bus Line
C
B
400 pF 8
EEPROM Write Time t
W
310 ms 9
PBRST = V
IL
t
PB
150 ns
Reset Active Time t
RST
200 320 550 ms
V
CC
Detect to RST and
RST (Power-Down)
t
RPD
58
ms
16
V
CC
Slew Rate t
VF
20
ms
V
CC
Detect to RST and
RST (Power-Up)
t
RPU
200 320 550 ms 15
V
CC
Slew Rate t
VR
0ns
PBRST Stable Low to
RST and
RST
t
PDLY
250 ns
IN Detect (Falling) to
NMI
t
IPD
58
ms
16
IN Detect (Rising) to
NMI
t
NMI
200 700
ms