CY7C421-20VXC Cypress Semiconductor Corp, CY7C421-20VXC Datasheet - Page 12
![IC ASYNC FIFO MEM 512X9 28-SOJ](/photos/7/9/70998/428-28-soj_sml.jpg)
CY7C421-20VXC
Manufacturer Part Number
CY7C421-20VXC
Description
IC ASYNC FIFO MEM 512X9 28-SOJ
Manufacturer
Cypress Semiconductor Corp
Series
CY7Cr
Datasheet
1.CY7C421-20JXC.pdf
(17 pages)
Specifications of CY7C421-20VXC
Access Time
10ns
Memory Size
4.6K (512 x 9)
Package / Case
28-SOJ
Function
Asynchronous
Data Rate
50MHz
Voltage - Supply
3.3V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Number Of Circuits
2
Data Bus Width
9 bit
Bus Direction
Unidirectional
Timing Type
Asynchronous
Organization
512 K x 9
Supply Voltage (max)
5.5 V
Supply Voltage (min)
4.5 V
Maximum Operating Current
55 mA
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
CY7C421-20VXC
Manufacturer:
CYPRESS/赛普拉斯
Quantity:
20 000
into the FIFO, with a signal that is asynchronous to the read
signal. The (internal) state machine in the FIFO goes from empty
to empty+1. However, it does this asynchronously with respect
to the read signal, so that the effective pulse width of the read
signal cannot be determined, because the state machine does
not look at the read signal until it goes to the empty+1 state.
Document #: 38-06001 Rev. *C
FULL
W
D
MR
9
Figure 13. Depth Expansion
9
9
9
FF
FF
FF
CY7C420/1
CY7C424/5
CY7C428/9
CY7C432/3
CY7C420/1
CY7C424/5
CY7C428/9
CY7C432/3
CY7C420/1
CY7C424/5
CY7C428/9
CY7C432/3
CY7C419
CY7C419
CY7C419
XO
XO
XO
XI
XI
XI
Similarly, the minimum write pulse width may be violated by
trying to write into a full FIFO, and asynchronously performing a
read. The empty and full flags are used to avoid these effective
pulse width violations, but to do this and operate at the maximum
frequency, the flag must be valid at the beginning of the next
cycle.
*
* FIRST DEVICE
EF
EF
EF
FL
FL
FL
CY7C419/21/25/29/33
9
Page 12 of 17
Q
EMPTY
R
V
CC
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