MSM6242B 查看數據表（PDF） - Oki Electric Industry

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MSM6242B

DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR

Oki Electric Industry 

¡ Semiconductor

MSM6242B

CS1

A0 ~ A3

CS0

ALE

WR

D0 ~ D3

(INPUT)

VIH2 –

VIH1 –

VIL1 –

VIH1 –

VIL1 –

VIH1 –

VIL1 –

VIH1 –

VIL1 –

tC1S

,,,

,,,, tAS

,,,

,, tAH

,,,, tC1H

,,,,,,,t,A,W,,,,,,,

tALW

,,,

,,

,,,

,,,,

tWW

,,,

tDS

tWAL

,,t,D,H,,,tR,,C,V,,,,,

,,,,,,,

Figure 5. Write Cycle — (With Use of ALE)

VIH1 = 2.2V

VIL1 = 0.8V

VIH2 = 4/5VDD

VIL2 = 1/5VDD

(3) READ mode (ALE = VDD)

Parameter

CS1 Set up Time

CS1 Hold Time

Address Stable before

READ

Address Stable after

READ

RD to Data

Data Hold

RD / WR Recovery Time

Symbol

tC1S

tC1H

tAR

tRA

tRD

tDR

tRCV

Condition

—

—

—

—

CL = 150pF

—

—

(VDD = 5V ± 10%, Ta = -40 to +85°C)

Min.

Max.

Unit

1000

—

1000

—

20

—

ns

0

—

—

120

0

—

60

—

CS1

A0 ~ A3

CS0

RD

D0 ~ D3

(OUTPUT)

VIH2 –

VIH1 –

VIL1 –

tC1S

,,,

VIH1 –

VIL1 –

VOH –

VOL –

,,,,,

tAR

,,,,

tRA

tC1H

,,,,

,,,

,,, tRD

tDR,t,R,C,V,,,,,,,,

,,,,,,,,,,,,,,,,,,

"Z"

Figure 6. Read Cycle — (ALE = VDD)

VIH1 = 2.2V

VIL1 = 0.8V

VIH2 = 4/5VDD

VIL2 = 1/5VDD

VOH = 2.2V

VOL = 0.8V

29

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