CY7C4255-25AC Cypress Semiconductor Corp, CY7C4255-25AC Datasheet - Page 8

• 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

Switching Waveforms
First Data Word Latency after Reset with Simultaneous Read and Write
Reset Timing
Notes:
REN, WEN,
16. The clocks (RCLK, WCLK) can be free-running during reset.
17. After reset, the outputs will be LOW if OE = 0 and three-state if OE = 1.
18. When t
19. The first word is available the cycle after EF goes HIGH, always.
Q
D
0
0
Q
WCLK
RCLK
EF,PAE
FF,PAF,
WEN
–D
–Q
0 –
REN
t
SKEW2
OE
EF
17
17
RS
Q
HF
LD
17
. The Latency Timing applies only at the Empty Boundary (EF = LOW).
SKEW2
t
ENS
[16]
> minimum specification, t
t
DS
D
0
(FIRSTVALID WRITE)
(continued)
FRL
t
SKEW2
(maximum) = t
t
t
t
RSF
RSF
RSF
t
RS
t
OLZ
t
FRL
CLK
[18]
+ t
SKEW2
t
D
REF
. When t
1
8
SKEW2
t
OE
< minimum specification, t
t
RSR
t
D
A
2
FRL
(maximum) = either 2*t
D
0
t
A
[19]
D
3
CLK
OE=0
OE=1
+ t
CY7C4255
CY7C4265
SKEW2
[17]
or t
CLK
4255–8
D
4255–9
1
+
D
4