CY7C4255-25AC Cypress Semiconductor Corp, CY7C4255-25AC Datasheet - Page 7

• Manufacturer Part Number: CY7C4255-25AC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C4255-25AC

• Density: 128Kb
• Word Size: 18b
• Sync/async: Synchronous
• Expandable: Yes
• Package Type: TQFP
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / Rohs Status: Not Compliant

Document #: 38-06004 Rev. *C
Switching Waveforms
Write Cycle Timing
Read Cycle Timing
Notes:
14. t
15. t
between the rising edge of RCLK and the rising edge of WCLK is less than t
between the rising edge of WCLK and the rising edge of RCLK is less than t
SKEW1
SKEW2
Q
D
0
0
WCLK
WCLK
RCLK
RCLK
WEN
–D
–Q
WEN
REN
REN
OE
EF
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
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
FF
17
17
t
ENS
t
OLZ
t
SKEW1
t
ENH
t
[14]
t
CLKH
CLKH
t
t
t
WFF
A
REF
t
OE
t
t
CLK
CLK
t
SKEW2
NO OPERATION
[15]
t
DS
t
CLKL
t
CLKL
t
ENS
SKEW1
SKEW2
, then FF may not change state until the next WCLK rising edge.
, then EF may not change state until the next RCLK rising edge.
t
VALID DATA
DH
t
ENH
t
REF
t
WFF
t
OHZ
NO OPERATION
CY7C4255
CY7C4265
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