CY7C421-20VXC Cypress Semiconductor Corp, CY7C421-20VXC Datasheet - Page 12

• Manufacturer Part Number: CY7C421-20VXC
• Description: IC ASYNC FIFO MEM 512X9 28-SOJ
• Manufacturer: Cypress Semiconductor Corp
• Series: CY7Cr

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

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
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Q
EMPTY
R
V
CC
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