IDT72205LB10TF(2000) 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72205LB10TF
(Rev.:2000)

CMOS SyncFIFO™ 256 x 18, 512 x 18, 1,024 x 18, 2,048 x 18 and 4,096 x 18

Integrated Device Technology 

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

Commercial And Industrial Temperature Ranges

After half of the memory is filled, and at the LOW-to-HIGH

transition of the next write cycle, the Half-Full Flag goes LOW

and will remain set until the difference between the write

pointer and read pointer is less than or equal to one half of the

total memory of the device. The Half-Full Flag (HF) is then

reset to HIGH by the LOW-to-HIGH transition of the read clock

(RCLK). The HF is asynchronous.

In the Daisy Chain Depth Expansion mode, WXI is connected

to WXO of the previous device. This output acts as a signal to the

next device in the Daisy Chain by providing a pulse when the

previous device writes to the last location of memory.

READ EXPANSION OUT (RXO)

In the Daisy Chain Depth Expansion configuration, Read

Expansion In (RXI) is connected to Read Expansion Out (RXO)

of the previous device. This output acts as a signal to the next

device in the Daisy Chain by providing a pulse when the

previous device reads from the last location of memory.

DATA OUTPUTS (Q0-Q17)

Q0-Q17 are data outputs for 18-bit wide data.

,,

,

,,

Q0 - Q17

t RS

tRSS

t RSF

t RSF

t RSF

NOTES:

1. After reset, the outputs will be LOW if OE = 0 and tri-state if OE = 1.

2. The clocks (RCLK, WCLK) can be free-running during reset.

Figure 4. Reset Timing(2)

t RSR

= 1(1)

=0

2766 drw 06

8

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