Datasheet

DS17285/DS17287/DS17485/DS17487/DS17885/DS17887
Real-Time Clocks
_____________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 3.0V, T
A
= Over the operating range, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BAT
or V
BAUX
Current (Oscillator
On); T
A
= +25°C, V
BAT
= 3.0V
I
BAT
(Note 7) 500 700 nA
V
BAT
or V
BAUX
Current
(Oscillator Off)
I
BATDR
(Note 7) 50 400 nA
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +4.5V to +5.5V, T
A
= Over the operating range, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Cycle Time t
CYC
240 DC ns
Pulse Width, RD or WR Low PW
RWL
120 ns
Pulse Width, RD or WR High PW
RWH
80 ns
Input Rise and Fall t
R
, t
F
30 ns
Chip-Select Setup Time Before
RD or WR
t
CS
20 ns
Chip-Select Hold Time t
CH
0ns
Read-Data Hold Time t
DHR
10 50 ns
Write-Data Hold Time t
DHW
0ns
Address Setup Time to ALE Fall t
ASL
20 ns
Address Hold Time to ALE Fall t
AHL
10 ns
RD or WR High Setup to ALE
Rise
t
ASD
25 ns
Pulse Width ALE High PW
ASH
40 ns
Delay Time ALE Low to RD Low t
ASED
30 ns
Output Data Delay Time from RD t
DDR
(Note 8) 20 120 ns
Data Setup Time t
DSW
30 ns
IRQ Release from RD t
IRD
2µs