Cypress CY7C1480V25, CY7C1486V25, CY7C1482V25 manual Truth Table, Operation Add. Used

CY7C1480V25

CY7C1482V25

CY7C1486V25

Truth Table

The truth table for CY7C1480V25, CY7C1482V25, and CY7C1486V25 follows.[3, 4, 5, 6, 7]

Operation

Add. Used

CE1

CE2

CE3

ZZ

ADSP

ADSC

ADV

WRITE

OE

CLK

DQ

Deselect Cycle, Power Down

None

H

X

X

L

X

L

X

X

X

L-H

Tri-State

Deselect Cycle, Power Down

None

L

L

X

L

L

X

X

X

X

L-H

Tri-State

Deselect Cycle, Power Down

None

L

X

H

L

L

X

X

X

X

L-H

Tri-State

Deselect Cycle, Power Down

None

L

L

X

L

H

L

X

X

X

L-H

Tri-State

Deselect Cycle, Power Down

None

L

X

H

L

H

L

X

X

X

L-H

Tri-State

Sleep Mode, Power Down

None

X

X

X

H

X

X

X

X

X

X

Tri-State

Read Cycle, Begin Burst

External

L

H

L

L

L

X

X

X

L

L-H

Q

Read Cycle, Begin Burst

External

L

H

L

L

L

X

X

X

H

L-H

Tri-State

Write Cycle, Begin Burst

External

L

H

L

L

H

L

X

L

X

L-H

D

Read Cycle, Begin Burst

External

L

H

L

L

H

L

X

H

L

L-H

Q

Read Cycle, Begin Burst

External

L

H

L

L

H

L

X

H

H

L-H

Tri-State

Read Cycle, Continue Burst

Next

X

X

X

L

H

H

L

H

L

L-H

Q

Read Cycle, Continue Burst

Next

X

X

X

L

H

H

L

H

H

L-H

Tri-State

Read Cycle, Continue Burst

Next

H

X

X

L

X

H

L

H

L

L-H

Q

Read Cycle, Continue Burst

Next

H

X

X

L

X

H

L

H

H

L-H

Tri-State

Write Cycle, Continue Burst

Next

X

X

X

L

H

H

L

L

X

L-H

D

Write Cycle, Continue Burst

Next

H

X

X

L

X

H

L

L

X

L-H

D

Read Cycle, Suspend Burst

Current

X

X

X

L

H

H

H

H

L

L-H

Q

Read Cycle, Suspend Burst

Current

X

X

X

L

H

H

H

H

H

L-H

Tri-State

Read Cycle, Suspend Burst

Current

H

X

X

L

X

H

H

H

L

L-H

Q

Read Cycle, Suspend Burst

Current

H

X

X

L

X

H

H

H

H

L-H

Tri-State

Write Cycle, Suspend Burst

Current

X

X

X

L

H

H

H

L

X

L-H

D

Write Cycle, Suspend Burst

Current

H

X

X

L

X

H

H

L

X

L-H

D

Notes

3.X = “Don't Care.” H = Logic HIGH, L = Logic LOW.

4.WRITE = L when any one or more Byte Write Enable signals and BWE = L or GW = L. WRITE = H when all Byte Write Enable signals, BWE, GW = H.

5.The DQ pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.

6.The SRAM always initiates a read cycle when ADSP is asserted, regardless of the state of GW, BWE, or BWX. Writes may occur only on subsequent clocks after the ADSP or with the assertion of ADSC. As a result, OE must be driven HIGH before the start of the write cycle to enable the outputs to tri-state. OE is a don't care for the remainder of the write cycle

7.OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle all data bits are tri-state when OE is inactive or when the device is deselected, and all data bits behave as output when OE is active (LOW).

Document #: 38-05282 Rev. *H Page 10 of 32

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