MC146818A View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

MFG CO.

MC146818A

REAL-TIME CLOCK PLUS RAM

Motorola => Freescale 

FIGURE 3 – BUS READ TIMING COMPETITOR MULTIPLEXED BUS

‘LE(AddressLatch

~ (Read Output Enable)

(DS Pin)

C= (Chip Select)

I IL

STBY

ADO-AD7

(Address/ Data Bus)

FIGURE 4 – BUS WRITE TIMINti?@PETITOR

MULTIPLEXED BUS

ADO-AD7

(Address/ Data Bus)

@- *W

25

.

J

Address

<;

Valid

Note: VHIGH=VDD-2.O

V, VLOW=O.8 V, for VDD=5.O V A 10% for outputs only.

VHIGH=2.O V, VLOW=O.5 V, for VDD=3.O V for outputs only.

31

@

Write Data

Valld

MOTOROLA

@

Semicondu‘c- tor Products Inc. A

5

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