Rainbow-electronics DS12887 Manual de usuario descargar pdf (Pagina 15)

DS12887

15 of 19

AC ELECTRICAL CHARACTERISTICS (V

= 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

150 ns

Pulse Width, DS/E High or RD/ WR Low

125 ns

Input Rise and Fall Time t

, t

30 ns

R/ W Hold Time

RWH

10 ns

R/ W Setup Time Before DS/E

RWS

50 ns

Chip-Select Setup Time Before DS, WR ,

or RD

20 ns

Chip-Select Hold Time t

0ns

Read-Data Hold Time t

DHR

10 80 ns

Write-Data Hold Time t

DHW

0ns

Muxed Address Valid Time to AS/ALE

Fall

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

DDR

20 120 ns 6

Data Setup Time t

DSW

100 ns

Reset Pulse Width t

RWL

IRQ Release from DS

IRDS

IRQ Release from RESET

IRR

NOTES:

1) All voltages are referenced to ground.

2) All outputs are open.

3) The MOT pin has an internal pulldown of 20kW.

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.

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