CY7C4245-25JC Cypress Semiconductor Corp, CY7C4245-25JC Datasheet - Page 16

• Manufacturer Part Number: CY7C4245-25JC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C4245-25JC

• Density: 64Kb
• Word Size: 18b
• Sync/async: Synchronous
• Expandable: Yes
• Package Type: LCC
• 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: 68
• Lead Free Status / Rohs Status: Not Compliant

Depth Expansion Configuration
(with Programmable Flags)
The CY7C42X5 can easily be adapted to applications requir-
ing more than 64/256/512/1024/2048/4096 words of buffering.
Figure 2 shows Depth Expansion using three CY7C42X5s. Maxi-
mum depth is limited only by signal loading. Follow these steps:
1. The first device must be designated by grounding the First
2. All other devices must have FL in the HIGH state.
DATAIN (D)
Load (FL) control input.
LOAD (LD)
Figure 2. Block Diagram of 192 x 18/768 x 18/1536 x 18/3072 x 18/12288 x 18 Synchronous FIFO Memory
FF
PAF
WRITE ENABLE (WEN)
WRITECLOCK (WCLK)
RESET(RS)
with Programmable Flags used in Depth Expansion Configuration.
FIRSTLOAD (FL)
FIRSTLOAD (FL)
FIRSTLOAD (FL)
V
V
CC
CC
FF
PAF
FF
PAF
FF
PAF
WXO RXO
WXO RXO
WXO RXO
7C4425
7C4205
7C4215
7C4225
7C4235
7C4235
WXI RXI
7C4425
7C4205
7C4215
7C4225
7C4235
7C4235
WXI RXI
7C4425
7C4205
7C4215
7C4225
7C4235
7C4235
WXI RXI
16
3. The Write Expansion Out (WXO) pin of each device must be
4. The Read Expansion Out (RXO) pin of each device must be
5. All Load (LD) pins are tied together.
6. The Half-Full Flag (HF) is not available in the Depth Expansion
7. EF, FF, PAE, and PAF are created with composite flags by
PAE
PAE
PAE
EF
EF
EF
tied to the Write Expansion In (WXI) pin of the next device.
tied to the Read Expansion In (RXI) pin of the next device.
Configuration.
ORing together these respective flags for monitoring. The
composite PAE and PAF flags are not precise.
READ CLOCK (RCLK)
READ ENABLE (REN)
OUTPUT ENABLE (OE)
CY7C4425/4205/4215
CY7C4225/4235/4245
PAE
42X5–23
EF
DATAOUT (Q)