CY7C4251-10AI Cypress Semiconductor Corp, CY7C4251-10AI Datasheet - Page 12

• Manufacturer Part Number: CY7C4251-10AI
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C4251-10AI

• Configuration: Dual
• Density: 64Kb
• Access Time (max): 8ns
• Word Size: 9b
• Organization: 8Kx9
• Sync/async: Synchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: TQFP
• Clock Freq (max): 100MHz
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 40mA
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / Rohs Status: Not Compliant

Document #: 38-06016 Rev. *D
Notes
WEN2/LD
16. The clocks (RCLK, WCLK) can be free-running during reset.
17. Holding WEN2/LD HIGH during reset makes the pin act as a second enable pin. Holding WEN2/LD LOW during reset makes the pin act as a load enable for the
18. After reset, the outputs are LOW if OE = 0 and three-state if OE = 1.
19. When t
20. The first word is available the cycle after EF goes HIGH, always.
programmable flag offset registers.
t
SKEW1
Q
EF,PAE
FF,PAF,
REN1,
WEN1
0 -
REN2
. The Latency Timing applies only at the Empty Boundary (EF = LOW).
RS
SKEW1
[17]
Q
(if applicable)
8
D
WEN2
Q
> minimum specification, t
WCLK
WEN1
REN1,
RCLK
REN2
0
0
–D
–Q
OE
EF
8
8
Figure 8. First Data Word Latency after Reset with Simultaneous Read and Write
t
ENS
t
DS
D
0 (FIRST
FRL
(maximum) = t
VALID
t
t
t
t
RSF
RSF
RSF
SKEW1
t
Write)
RS
t
t
t
t
OLZ
t
RSS
RSS
RSS
FRL
CLK
Figure 7. Reset Timing
[19]
+ t
SKEW1
t
REF
D
1
. When t
t
SKEW1
OE
< minimum specification, t
t
A
D
[16]
2
[]
t
t
t
RSR
RSR
RSR
CY7C4421/4201/4211/4221
D
0
FRL
D
t
A
(maximum) = either 2*t
3
CY7C4231/4241/4251
D
OE = 0
OE = 1
1
D
4
CLK
[18]
+ t
Page 12 of 20
SKEW1
or t
CLK
+
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