Rainbow Electronics DS12887 - Manual (Page 15)

DS12887
15 of 19
AC ELECTRICAL CHARACTERISTICS
( V
CC
= 4.5V to 5.5V, 0
°
C to +70
°
C)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Cycle Time t
CYC
385 DC ns
Pulse Width, DS/E Low or RD/ WR High PW
EL
150 ns
Pulse Width, DS/E High or RD/ WR Low PW
EH
125 ns
Input Rise and Fall Time t
R
, t
F
30 ns
R/ W Hold Time t
RWH
10 ns
R/ W Setup Time Before DS/E t
RWS
50 ns
Chip-Select Setup Time Before DS, WR ,
or RD
t
CS
20 ns
Chip-Select Hold Time t
CH
0 ns
Read-Data Hold Time t
DHR
10 80 ns
Write-Data Hold Time t
DHW
0 ns
Muxed Address Valid Time to AS/ALE
Fall
t
ASL
30 ns
Muxed Address Hold Time t
AHL
10 ns
Delay Time DS/E to AS/ALE Rise t
ASD
20 ns
Pulse Width AS/ALE High PW
ASH
60 ns
Delay Time, AS/ALE to DS/E Rise t
ASED
40 ns
Output Data Delay Time From DS/E or
RD
t
DDR
20 120 ns 6
Data Setup Time t
DSW
100 ns
Reset Pulse Width t
RWL
5 ms
IRQ Release from DS t
IRDS
2 ms
IRQ Release from RESET
t
IRR
2 ms
NOTES:
1) All voltages are referenced to ground.
2) All outputs are open.
3) The MOT pin has an internal pulldown of 20k
W.
4) Applies to the AD0–AD7 pins, the IRQ pin, and the SQW pin when each is in the high-impedance
state.
5) The IRQ pin is open drain.
6) Measured with a load as shown in Figure 4.
7) RTC modules can be successfully processed through conventional wave-soldering techniques as long
as temperature exposure to the lithium energy source contained within does not exceed +85 °C.
However, post-solder cleaning with water-washing techniques is acceptable, provided that ultrasonic
vibration is not used to prevent damage to the crystal.