CY7C421-20VC Cypress Semiconductor Corp, CY7C421-20VC Datasheet - Page 8

• Manufacturer Part Number: CY7C421-20VC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C421-20VC

• Configuration: Dual
• Density: 4.5Kb
• Access Time (max): 20ns
• Word Size: 9b
• Organization: 512x9
• Sync/async: Asynchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: SOJ
• Clock Freq (max): Not RequiredMHz
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Supply Current: 55mA
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Not Compliant

Switching Waveforms
Document #: 38-06001 Rev. *D
Notes
12. EF, HF and FF may change state during retransmit as a result of the offset of the read and write pointers, but flags are valid at t
13. t
DATA OUT
RTC
FL/RT
= t
R,W
PRT
FF
EF
W
W
R
R
+ t
RTR
.
t
t
REF
WFF
LAST WRITE
LAST READ
t
A
VALID
(continued)
Figure 8. Last Read to First Write Empty Flag
Figure 7. Last Write to First Read Full Flag
t
PRT
t
RTC
[13]
FIRST WRITE
FIRST READ
Figure 9. Retransmit
t
t
WEF
RFF
t
RTR
ADDITIONAL
ADDITIONAL
WRITES
READS
[12]
FIRST WRITE
FIRST READ
CY7C419/21/25/29/33
VALID
RTC
.
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