X84160/640/128

2

PIN DESCRIPTIONS

Chip Enable (CE)

The Chip Enable input must be LOW to enable all read/

write operations. When CE is HIGH, the chip is dese-

lected, the I/O pin is in the high impedance state, and

unless a nonvolatile write operation is underway, the

device is in the standby power mode.

Output Enable (OE)

The Output Enable input must be LOW to enable the out-

put buffer and to read data from the device on the I/O line.

Write Enable (WE)

The Write Enable input must be LOW to write either data

or command sequences to the device.

Data In/Data Out (I/O)

Data and command sequences are serially written to or

serially read from the device through the I/O pin.

Write Protect (WP)

The Write Protect input controls the Hardware Write Pro-

tect feature. When WP is LOW and the nonvoltaile bit

WPEN is “1”, nonvolatile writes of the X84160/640/128

control register is disabled, but the part otherwise func-

tions normally. When WP is held HIGH, all functions,

including nonvolatile write operate normally. WP going

LOW while CS is still LOW will interrupt a write to the

X84160/640/128 control register. If the internal Write

cycle has already been initiated, WP going LOW will

have no effect on write.

The WP pin function is blocked when the WPEN bit in the

control register is “0”. This allows the user to install the

X84160/640/128 in a system with WP pin grounded and

still be able to write to the control register. The WP pin

functions will be enabled when the WPEN bit is set “1”.

PIN CONFIGURATIONS: Drawings are to the same scale, actual package sizes are shown in inches:

VCC

NC

OE

WE

CE

I/O

WP

VSS

1

2

3

4

8

7

6

5

8-LEAD SOIC

1

2

3

4

5

6

7

8

14

13

12

11

10

9

14-LEAD SOIC

CE

I/O

NC

NC

NC

WP

VSS

V CC

NC

NC

NC

NC

OE

WE

PIN NAMES

I/O

Data Input/Output

CE

Chip Enable Input

OE

Output Enable Input

WE

Write Enable Input

WP

Write Protect Input

Supply Voltage

Ground

NC

No Connect

PACKAGE

SELECTION GUIDE

84160

8-Lead PDIP

8-Lead SOIC

8-Lead TSSOP

84640

8-Lead CSP/BGA

8-Lead PDIP

8-Lead SOIC

20-Lead TSSOP

84128

8-Lead CSP/BGA

8-Lead PDIP

14-Lead SOIC

28-Lead TSSOP

1

2

3

4

5

6

7

20

19

18

17

16

15

14

20-LEAD TSSOP

CE

I/O

NC

NC

NC

WP

VSS

VCC

NC

NC

NC

NC

OE

WE

8

9

10

13

12

11

NC

NC

NC

NC

NC

NC

1

2

3

4

5

6

7

20

19

18

17

16

15

28-LEAD TSSOP

NC

NC

WP

NC

NC

NC

OE

WE

NC

NC

8

9

10

I/O

CE

NC

NC

NC

CE

CE

NC

NC

NC

NC

NC

NC

11

12

13

14

21

22

23

24

25

26

27

28

X84160

X84640

X84128

.190 in.

.230 in.

.230 in.

.390 in.

.250 in.

.394 in.

.252 in.

. 252 in.

X84128

X84640

NC

NC

NC

OE

NC

CE

I/O

1

2

3

4

8

7

6

5

8-LEAD TSSOP

X84160

.114 in.

.252 in.

WE

WP

VSS

8-LEAD PDIP

8-LEAD XBGA: Top View

NC

WE

OE

VSS

WP

VCC

I/O

CE

1

2

3

4

8

7

6

5

.078 in.