Rainbow Electronics DS1374 - Manual (Page 4)

DS1374
I 2 C, 32-Bit Binary Counter Watchdog RTC with
Trickle Charger and Reset Input/Output
4 _____________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(V CC = V CC MIN to V CC MAX , T A = -40°C to +85°C, unless otherwise noted.) (Note 1) (Figure 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Fast mode 100 400
SCL Clock Frequency (Note 16) f SCL
Standard mode 0 100
kHz
Fast mode 1.3 Bus Free Time Between STOP
and START Conditions
t
BUF
Standard mode 4.7
µs
Fast mode 0.6 Hold Time (Repeated) START
Condition (Note 17)
t HD:STA
Standard mode 4.0
µs
Fast mode 1.3
Low Period of SCL Clock t LOW
Standard mode 4.7
µs
Fast mode 0.6
High Period of SCL Clock t HIGH
Standard mode 4.0
µs
Fast mode 0 0.9
Data Hold Time (Notes 18, 19) t
HD:DAT
Standard mode 0 0.9
µs
Fast mode 100
Data Setup Time (Note 20) t SU:DAT
Standard mode 250
ns
Fast mode 0.6
Start Setup Time t SU:STA
Standard mode 4.7
µs
Fast mode 300 Rise Time of Both SDA and SCL
Signals (Note 16)
t R
Standard mode
20 +
0.1C B 1000
ns
Fast mode 300 Fall Time of Both SDA and SCL
Signals (Note 16)
t F
Standard mode
20 +
0.1C B 300
ns
Fast mode 0.6
Setup Time for STOP Condition t SU:STO
Standard mode 4.7
µs
C ap aci ti ve Load for E ach Bus Li ne C B (Note 16) 400 pF
I/O C ap aci tance ( S D A, S C L) C I/O (Note 21) 10 pF
Pulse Width of Spikes That Must
be Suppressed by the Input Filter
t SP Fast mode 30 ns
Pushbutton Debounce PB DB (Figure 2) 250 ms
Reset Active Time t RST (Figure 2) 250 ms
Oscillator Stop Flag (OSF) Delay t
OSF
(Note 22) 100 ms