CY7C429-10JC Cypress Semiconductor Corp, CY7C429-10JC Datasheet - Page 12

• Manufacturer Part Number: CY7C429-10JC
• Description: IC ASYNC FIFO MEM 2KX9 32-PLCC
• Manufacturer: Cypress Semiconductor Corp
• Series: CY7Cr

Specifications of CY7C429-10JC

• Function: Asynchronous
• Memory Size: 18K (2K x 9)
• Data Rate: 50MHz
• Access Time: 10ns
• Voltage - Supply: 3.3V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1243

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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