6.42

IDT71V2556, 128K x 36, 3.3V Synchronous ZBT™ SRAMs

with 2.5V I/O, Burst Counter, and Pipelined Outputs

Commercial and Industrial Temperature Ranges

7

NOTES:

2. When ADV/LD signal is sampled high, the internal burst counter is incremented. The R/W signal is ignored when the counter is advanced. Therefore the nature of

the burst cycle (Read or Write) is determined by the status of the R/W signal when the first address is loaded at the beginning of the burst cycle.

tri-state two cycles after deselect is initiated.

4. When CEN is sampled high at the rising edge of clock, that clock edge is blocked from propogating through the part. The state of all the internal registers and the I/

Os remains unchanged.

6. Device Outputs are ensured to be in High-Z after the first rising edge of clock upon power-up.

7. Q - Data read from the device, D - data written to the device.

NOTES:

2. Multiple bytes may be selected during the same cycle.

N

E

C

/

R

W

p

i

h

C

)

5

(

e

l

b

a

n

E

/

V

D

A

D

L

W

B x

S

S

E

R

D

D

A

D

E

S

U

E

L

C

Y

C

S

U

O

I

V

E

R

PE

L

C

Y

C

T

N

E

R

R

U

CO

/

I

)

6

(

)

r

e

t

a

l

s

e

l

c

y

c

2

(

LL

t

c

e

l

e

SL

d

il

a

Vl

a

n

r

e

t

x

EX

E

T

I

R

W

D

A

O

7

(

LH

t

c

e

l

e

SL

X

l

a

n

r

e

t

x

EX

D

A

E

R

D

A

O

7

(

LX

X

H

d

il

a

Vl

a

n

r

e

t

n

I/

E

T

I

R

W

D

A

O

L

E

T

I

R

W

T

S

R

U

B

E

T

I

R

W

T

S

R

U

B

)

r

e

t

n

u

o

c

t

s

r

u

b

e

c

n

a

v

d

A

(

)

2

(

7

(

LX

X

H

X

l

a

n

r

e

t

n

I/

D

A

E

R

D

A

O

L

D

A

E

R

T

S

R

U

B

D

A

E

R

T

S

R

U

B

)

r

e

t

n

u

o

c

t

s

r

u

b

e

c

n

a

v

d

A

(

)

2

(

7

(

LX

t

c

e

l

e

s

e

DL

X

X

X

P

O

T

S

r

o

T

C

E

L

E

S

E

D

)

3

(

Z

i

H

LX

X

H

X

X

P

O

O

N

/

T

C

E

L

E

S

E

DP

O

O

NZ

i

H

HX

X

X

X

X

X

D

N

E

P

S

U

S

)

4

(

e

u

l

a

V

s

u

o

i

v

e

r

P

8

0

l

b

t

5

7

8

4

N

O

I

T

A

R

E

P

O/

R

W

W

W

W

W

D

A

E

R

H

XXXX

S

E

T

Y

B

L

L

A

E

T

I

R

W

LLLLL

O

/I

,

]

7

:

0

[

O

/I

(

1

E

T

Y

B

E

T

I

R

W

1

P

2

(

L

L

HHH

O

/I

,

]

5

1

:

8

[

O

/I

(

2

E

T

Y

B

E

T

I

R

W

2

P

2

(

LH

LH

H

O

/I

,

]

3

2

:

6

1

[

O

/I

(

3

E

T

Y

B

E

T

I

R

W

3

P

2

(

LH

H

L

H

O

/I

,

]

1

3

:

4

2

[

O

/I

(

4

E

T

Y

B

E

T

I

R

W

4

P

2

(

L

HHH

L

E

T

I

R

W

O

N

L

HHHH

9

0

l

b

t

5

7

8

4