Rainbow-electronics DS12C887 Manual de usuario descargar pdf (Pagina 14)

DS12C887

14 of 19

AC ELECTRICAL CHARACTERISTICS (0°C to 70°C; VCC = 5.0V ± 10%)

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 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

20 ns

Chip Select Hold Time t

0ns

Read Data Hold Time t

DHR

10 80 ns

Write Data Hold Time t

DHW

0ns

Mux’ed Address Valid Time to

ALE Fall

ASL

30 ns

Mused Address Hold Time to

ALE Fall

AHL

10 ns

Delay Time DS/E to AS/ALE

Rise

ASD

20 ns

Pulse Width AS/ALE High PW

ASH

60 ns

Delay Time, AS/ALE to DS/E

Rise

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

µs

IRQ Release from DS

IRDS

µs

IRQ Release from RESET

IRR

µs

NOTES:

1. All voltages are referenced to ground.

All Outputs are open.

The MOT pin has an internal pull-down of 20KΩ.

Applies to the AD0-AD7 pins, the IRQ pin, and the SQW pin when each is in a high impedance state.

The IRQ pin is open drain.

Measured with a load as shown in Figure 4.

Real-Time Clock 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. Post solder cleaning with water washing techniques is acceptable, provided that

ultrasonic vibration is not used. Such cleaning can damage the crystal.

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