BR9080AF-W View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BR9080AF-W

8k, 16k bit EEPROMs for direct connection to serial ports

ROHM Semiconductor 

Memory ICs

BR9080AF-W / BR9080ARFV-W / BR9080ARFVM-W /

BR9016AF-W / BR9016ARFV-W / BR9016ARFVM-W

!Circuit operation

(1) Command mode

BR9080A

Instruction

Start Bit

Read (READ)

1010

Write (WRITE)

1010

Write enable (WEN)

1010

Write disable (WDS)

1010

∗ : Means either VIH or VIL

Address and data are transferred from LSB.

Op Code

100 A0

010 A0

0011

0000

Address

A1 A2 A3 A4 A5 A6 A7 A8

A1 A2 A3 A4 A5 A6 A7 A8

∗∗∗∗∗∗∗∗

∗∗∗∗∗∗∗∗

Data

D0 D1 − D14 D15

BR9016A

Instruction

Start Bit

Read (READ)

1010

Write (WRITE)

1010

Write enable (WEN)

1010

Write disable (WDS)

1010

∗ : Means either VIH or VIL

Address and data are transferred from LSB.

Op Code

10 A0 A1

01 A0 A1

0011

0000

Address

A2 A3 A4 A5 A6 A7 A8 A9

A2 A3 A4 A5 A6 A7 A8 A9

∗∗∗∗∗∗∗∗

∗∗∗∗∗∗∗∗

Data

D0 D1 − D14 D15

(2) Writing enabled / disabled

H

SK

1

4

L

H

CS

L

8

12

16

ENABLE = 11

DISABLE = 00

H

DI

L

101

000

HIGH-Z

DO

H

R/B

WC

High or LOW

Fig.3

1) When CS is “HIGH” during power up, BR9080AF-W / ARFV-W / ARFVM-W, BR9016AF-W / ARFV-W / ARFVM-W

comes up in the write disabled (WDS) state. In order to be programmable, it must receive a write enable (WEN)

instruction.

The device remains programmable until a disable (WDS) instruction is entered, or until it is powered down.

2) It is unnecessary to add the clock after 16th clock.

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