CY7C4281
CY7C4291
Document #: 38-06007 Rev. *C Page 13 of 16
Programmable Almost Full Flag Timing
Write Programmable Registers
Notes:
23. If a write is performed on this rising edge of the write clock, there will be Full (m 1) words of the FIFO when PAF
goes LOW.
24. PAF offset = m.
25. 16,384 m words for CY7C4281, 32,768 m words for CY4291.
26. t
SKEW2
is the minimum time between a rising RCLK edge and a rising WCLK edge for PAF to change during that clock cycle. If the time between the rising edge
of RCLK and the rising edge of WCLK is less than t
SKEW2
, then PAF may not change state until the next WCLK.
Switching Waveforms (continued)
t
ENH
WCLK
PAF
RCLK
t
CLKH
t
ENS
(FULL M) WORDS
IN FIFO
t
CLKL
t
ENS
FULL (M+1)WORDS
IN FIFO
t
ENH
t
ENS
t
ENH
t
ENS
t
PAF
REN1,
REN2
WEN1
WEN2
(if applicable)
t
SKEW2
t
PAF
[25]
[26]
Note 23
Note 24
t
ENH
WEN2/LD
WCLK
t
CLKH
t
ENS
t
CLKL
PAE OFFSET
LSB
D
0
–D
8
WEN1
t
ENS
PAF OFFSET
MSB
t
CLK
t
DS
t
DH
PAE OFFSET
MSB
PAF OFFSET
LSB
[+] Feedback
CY7C4281
CY7C4291
Document #: 38-06007 Rev. *C Page 14 of 16
Read Programmable Registers
Switching Waveforms (continued)
PAF OFFSET
MSB
PAF OFFSET
LSB
t
ENH
WEN2/LD
RCLK
t
CLKH
t
ENS
t
CLKL
PAE OFFSET LSB
Q
0
–Q
15
REN1,
REN2
t
ENS
PAE OFFSET MSB
t
CLK
UNKNOWN
t
A
Ordering Information
64K x 9 Deep Sync FIFO
Speed
(ns) Ordering Code
Package
Name
Package
Type
Operating
Range
10 CY7C4281-10JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
CY7C4281-10JI J65 32-Lead Plastic Leaded Chip Carrier Industrial
15 CY7C4281-15JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
25 CY7C4281-25JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
128K x 9 Deep Sync FIFO
Speed
(ns) Ordering Code
Package
Name
Package
Type
Operating
Range
10 CY7C4291-10JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
CY7C4291-10JXC J65 32-Lead Pb-Free Plastic Leaded Chip Carrier Commercial
CY7C4291-10JI J65 32-Lead Plastic Leaded Chip Carrier Industrial
15 CY7C4291-15JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
CY7C4291-15JXC J65 32-Lead Pb-Free Plastic Leaded Chip Carrier Commercial
25 CY7C4291-25JC J65 32-Lead Plastic Leaded Chip Carrier Commercial
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CY7C4281
CY7C4291
Document #: 38-06007 Rev. *C Page 15 of 16
© Cypress Semiconductor Corporation, 2005. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use
of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be
used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its
products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress
products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.
Package Diagrams
All product and company names mentioned in this document are the trademarks of their respective holders.
51-85002-*B
32-Lead Pb-Free Plastic Leaded Chip Carrier J65
32-Lead Plastic Leaded Chip Carrier J65
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CY7C4291-10JXC

Mfr. #:
Manufacturer:
Cypress Semiconductor
Description:
IC DEEP SYNC FIFO 128KX9 32-PLCC
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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