CY7C421-25JI datasheet(8/25 Pages) CYPRESS

Part #	CY7C421-25JI

Description	256/512/1K/2K/4K x 9 Asynchronous FIFO

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Manufacturer	CYPRESS [Cypress Semiconductor]

Direct Link	http://www.cypress.com

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8 / 25 page

CY7C419/21/25/29/33

Document #: 38-06001 Rev. *B

Page 8 of 25

Switching Waveforms

Asynchronous Read and Write

Master Reset

Half-full Flag

Notes:

11. W and R

≥ V

IH around the rising edge of MR.

12. tMRSC = tPMR + tRMR.

DATA VALID

tSD

tHD

tRC

tPR

tA

tRR

tA

tLZR

tDVR

tHZR

tWC

tPW

tWR

R

Q0–Q 8

W

D0–D 8

MR

R,W

HF

FF

EF

tMRSC

tPMR

tEFL

tHFH

tFFH

tRPW

tWPW

tRMR

[11]

[12]

HALF FULL+1

HALF FULL

W

R

HF

tWHF

tRHF

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