CY7C4221V-25JC View Datasheet(PDF) - Cypress Semiconductor
Part Name
Description
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CY7C4221V-25JC Datasheet PDF : 16 Pages
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CY7C4421V/4201V/4211V/4221V
PRELIMINARY
CY7C4231V/4241V/4251V
Switching Waveforms
Write Cycle Timing
WCLK
D0 –D8
WEN1
tCLKH
tCLK
tCLKL
tDS
tENS
tDH
tENH
NO OPERATION
WEN2
(if applicable)
FF
RCLK
tWFF
tSKEW1 [9]
tWFF
NO OPERATION
REN1,REN2
Read Cycle Timing
RCLK
REN1,REN2
tENS
EF
Q0 –Q8
OE
tOLZ
WCLK
tCLKH
tCKL
tCLKL
tENH
tREF
tA
NO OPERATION
tOE
[10]
tSKEW1
tREF
VALID DATA
tOHZ
42X1V–6
WEN1
WEN2
42X1V–7
Notes:
9. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go HIGH during the current clock cycle. If the time between the
rising edge of RCLK and the rising edge of WCLK is less than tSKEW1, then FF may not change state until the next WCLK rising edge.
10. tSKEW1 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that EF will go HIGH during the current clock cycle. It the time between the
rising edge of WCLK and the rising edge of RCLK is less than tSKEW1, then EF may not change state until the next RCLK rising edge.
5
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