DS12R885/DS12CR887/DS12R887
RTCs with Constant-Voltage Trickle Charger
4 _____________________________________________________________________
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 2.97V to 3.63V, T
A
= -40°C to +85°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Cycle Time t
CYC
280 DC ns
Pulse Width, DS Low or R/W High PW
EL
130 ns
Pulse Width, DS High or R/W Low PW
EH
90 ns
Input Rise and Fall t
R
, t
F
30 ns
R/W Hold Time t
RWH
0 ns
R/W Setup Time Before DS t
RWS
15 ns
Chip-Select Setup Time Before
DS or R/W
t
CS
8 ns
Chip-Select Hold Time t
CH
0 ns
Read-Data Hold Time t
DHR
5 55 ns
Write-Data Hold Time t
DHW
0 ns
Address Valid Time to AS Fall t
ASL
30 ns
Address Hold Time to AS Fall t
AHL
15 ns
Delay Time DS to AS Rise t
ASD
15 ns
Pulse Width AS High PW
ASH
45 ns
Delay Time, AS to DS Rise t
ASED
55 ns
Output Data Delay Time from DS
or R/W
t
DDR
(Note 8) 20 80 ns
Data Setup Time t
DSW
70 ns
Reset Pulse Width t
RWL
5 μs
IRQ Release from DS t
IRDS
0 2 μs
IRQ Release from RESET t
IRR
0 2 μs
