CY7C421(2002) 查看數據表（PDF） - Cypress Semiconductor

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CY7C421
(Rev.:2002)

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

Cypress Semiconductor 

CY7C419/21/25/29/33

Switching Waveforms

Asynchronous Read and Write

R

Q0–Q 8

W

tA

tLZR

tPW

D0–D 8

tRC

tRR

tDVR

DATA VALID

tWC

tWR

tSD

tHD

DATA VALID

tPR

tA

tHZR

DATA VALID

DATA VALID

C420–9

Master Reset

MR

[11]

R, W

EF

HF

FF

Half-Full Flag

W

HALF FULL

[12]

tMRSC

tPMR

tEFL

tHFH

tFFH

R

tWHF

HF

tRPW

tWPW

tRMR

HALF FULL+1

C420–10

HALF FULL

tRHF

C420–11

Notes:

11. W and R ≥ VIH around the rising edge of MR.

12. tMRSC = tPMR + tRMR.

Document #: 38-06001 Rev. *A

Page 8 of 22

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