CY7C4801-25AC Cypress Semiconductor Corp, CY7C4801-25AC Datasheet - Page 16

• Manufacturer Part Number: CY7C4801-25AC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C4801-25AC

• Density: 4Kb
• Word Size: 9b
• Sync/async: Synchronous
• Expandable: Yes
• Package Type: TQFP
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 64
• Lead Free Status / Rohs Status: Not Compliant

Flag Operation
The CY7C48X1 devices provide four flag pins to indicate the
condition of the FIFO contents. Empty, Full, (PAEA,PAEB), and
(PAFA,PAFB) are synchronous.
Full Flag
The Full Flag (FFA,FFB) will go LOW when the device is full. Write
operations are inhibited whenever (FFA,FFB) is LOW regardless of
the state of (WENA1,WENB1) and (WENA2/LDA,WENB2/LDB).
Table 2. Status Flags.
0
1 to n
(n+1) to (256-(m+1))
(256 m)
256
0
1 to n
(n+1) to (2048 (m+1)) (n+1) to (4096 (m+1)) (n+1) to (8192 (m+1))
(2048 m)
2048
Notes:
25. n =Empty Offset (n=7 default value).
26. m = Full Offset (m=7 default value).
[25]
[25]
CY7C4831
[26]
CY7C4801
[26]
to 255
to 2047
Number of Words in FIFO
0
1 to n
(4096 m)
4096
[25]
CY7C4841
0
1 to n
(n+1) to (512-(m+1))
(512 m)
512
Number of Words in FIFO
[26]
[25]
to 4095
[26]
CY7C4811
to 511
0
1 to n
(8192 m)
8192
[25]
CY7C4851
[26]
16
to 8191
0
1 to n
(n+1) to (1024 (m+1))
(1024 m)
1024
(FFA,FFB) is synchronized to (WCLKA,WCLKB), i.e., it is exclusively
updated by each rising edge of (WCLKA,WCLKB).
Empty Flag
The Empty Flag (EFA,EFB) will go LOW when the device is empty.
Read operations are inhibited whenever (EFA,EFB) is LOW, regard-
less of the state of (RENA1,RENB1) and (RENA2,RENB2.
(EFA,EFB) is synchronized to (RCLKA,RCLKB), i.e., it is exclusively
Full Flag
[25]
CY7C4821
[26]
FF
H
H
H
H
to 1023
L
PAF
H
H
H
L
L
PAE
CY7C4831/4841/4851
CY7C4801/4811/4821
H
H
H
L
L
FF
EF
H
H
H
H
L
H
H
H
H
L
PAF
H
H
H
L
L
PAE
H
H
H
L
L
EF
H
H
H
H
L