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

• Manufacturer Part Number: CY7C421-20VXCT
• Description: CY7C421-20VXCT
• Manufacturer: Cypress Semiconductor Corp
• Series: CY7Cr

Specifications of CY7C421-20VXCT

• Function: Asynchronous
• Memory Size: 4.6K (512 x 9)
• Data Rate: 50MHz
• Access Time: 10ns
• Voltage - Supply: 3.3V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SOJ
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Switching Waveforms
Document #: 38-06001 Rev. *C
Notes
13. EF, HF and FF may change state during retransmit as a result of the offset of the read and write pointers, but flags will be valid at t
14. 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
[14]
FIRST WRITE
FIRST READ
Figure 9. Retransmit
t
t
WEF
RFF
t
RTR
ADDITIONAL
ADDITIONAL
WRITES
READS
[13]
FIRST WRITE
FIRST READ
CY7C419/21/25/29/33
VALID
RTC
.
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