72245LB15PF Integrated Device Technology (Idt), 72245LB15PF Datasheet - Page 15

• Manufacturer Part Number: 72245LB15PF
• Description: FIFO Mem Sync Dual Depth/Width Uni-Dir 4K x 18 64-Pin TQFP
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 72245LB15PF

• Package: 64TQFP
• Configuration: Dual
• Bus Directional: Uni-Directional
• Density: 72 Kb
• Organization: 4Kx18
• Data Bus Width: 18 Bit
• Timing Type: Synchronous
• Expansion Type: Depth|Width
• Typical Operating Supply Voltage: 5 V
• Operating Temperature: 0 to 70 °C

DEPTH EXPANSION CONFIGURATION —
(WITH PROGRAMMABLE FLAGS)
512/1,024/2,048/4,096 words of buffering. Figure 21 shows Depth Expansion
using three IDT72205LB/72215LB/72225LB/72235LB/72245LBs. Maximum
depth is limited only by signal loading. Follow these steps:
IDT72205LB/72215LB/72225LB/72235LB/72245LB CMOS SyncFIFO
256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18
WRITE ENABLE
These devices can easily be adapted to applications requiring more than 256/
1. The first device must be designated by grounding the First Load (FL)
2. All other devices must have FL in the HIGH state.
WRITE CLOCK
control input.
DATA IN
RESET
LOAD
Figure 21. Block Diagram of 768 x 18, 1,536 x 18, 3,072 x 18, 6,144 x 18, 12,288 x 18 Synchronous
FIFO Memory With Programmable Flags used in Depth Expansion Configuration
FIRST LOAD (
Vcc
Vcc
)
Dn
WCLK
WCLK
Dn
Dn
WCLK
72205LB
72215LB
72225LB
72235LB
72245LB
72205LB
72215LB
72225LB
72235LB
72245LB
72205LB
72215LB
72225LB
72235LB
72245LB
IDT
IDT
IDT
RCLK
RCLK
RCLK
Qn
Qn
Qn
15
TM
3. The Write Expansion Out (WXO) pin of each device must be tied to
4. The Read Expansion Out (RXO) pin of each device must be tied to the
5. All Load (LD) pins are tied together.
6. The Half-Full Flag (HF) is not available in this Depth Expansion
7. EF, FF, PAE, and PAF are created with composite flags by ORing
the Write Expansion In (WXI) pin of the next device. See Figure 21.
Read Expansion In (RXI) pin of the next device. See Figure 21.
Configuration.
together every respective flags for monitoring. The composite PAE
and PAF flags are not precise.
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
OCTOBER 22, 2008
READ CLOCK
READ ENABLE
DATA OUT
OUTPUT ENABLE
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