CY7C4801-25AC Cypress Semiconductor Corp, CY7C4801-25AC Datasheet - Page 18

• 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

Width Expansion Configuration
Word width may be increased simply by connecting the corre-
sponding input control signals of FIFOs A and B. A composite
flag should be created for each of the end-point status flags
EFA and EFB, also FFA and FFB. The partial status flags
PAEA, PAFB, PAFA, PAFB can be detected from any one de-
vice. Figure 3 demonstrates an 18-bit word width using the two
FIFOs contained in one CY7C4801/4811/4821/4831/4841
/4851. Any word width can be attained by adding additional
CY7C4801/4811/4821/4831/4841/4851s.
WRITE ENABLE 2/LOAD
WRITECLOCK
WRITE ENABLE
Figure 3. Block Diagram of two FIFOs contained in one CY7C4801/4811/4821/4831/4841/4851 configured for an 18-bit
FULL FLAG
D
0
D
17
18
WEN2/LD
WENA
WCLKA
9
9
FFA
FFB
RESET (RSA)
Read Enable 2
RAM ARRAY A
1024 x 9
2048 x 9
4096 x 9
8192 x 9
256 x 9
512 x 9
(RENA2)
EF
width-expansion.
9
WENB2/LDB
WCLKB
WENB1
RCLKA
RENA1
OEA
9
18
When the CY7C4801/4811/4821/4831/4841/4851 is in a
Width Expansion Configuration, the Read Enable 2 (RENA2
and RENB2) control unputs can be grounded (see Figure 3 ).
In
(WENA2/LDA,WENB2/LDB) pins are set LOW at Reset so
that the pin operates as a control to load and read the program-
mable flag offsets.
Read Enable 2 (RENB2)
this
RAM ARRAY B
FF
1024 x 9
2048 x 9
4096 x 9
8192 x 9
256 x 9
512 x 9
configuration,
RESET(RSB)
9
RCLKB
EFB
RENB1
EFA
OEB
CY7C4831/4841/4851
CY7C4801/4811/4821
the
READCLOCK
READ ENABLE
OUTPUT ENABLE
Q
0
Write
Q
17
48X1–17
Enable
EMPTY FLAG
RESET
18
2/Load