IDT72421(1995) データシートの表示（PDF） - Integrated Device Technology

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IDT72421
(Rev.:1995)

CMOS SyncFIFO 64 X 9, 256 x 9, 512 x 9, 1024 X 9, 2048 X 9 and 4096 x 9

Integrated Device Technology 

IDT72421/72201/72211/72221/72231/72241 CMOS SyncFIFO™

64 x 9, 256 x 9, 512 x 9, 1024 x 9, 2048 x 9 and 4096 x 9

MILITARY AND COMMERCIAL TEMPERATURE RANGES

DEPTH EXPANSION - The IDT72421/7221/72211/72221/

72231/72241 can be adapted to applications when the re-

quirements are for greater than 64/256/512/1024/2048/4096

words. The existence of two enable pins on the read and write

port allow depth expansion. The Write Enable 2/Load pin is

used as a second write enable in a depth expansion configu-

ration thus the Programmable flags are set to the default

values. Depth expansion is possible by using one enable

input for system control while the other enable input is con-

trolled by expansion logic to direct the flow of data. A typical

application would have the expansion logic alternate data

access from one device to the next in a sequential manner.

The IDT72421/7221/72211/72221/72231/72241 operates in

the Depth Expansion configuration when the following condi-

tions are met:

1. The WEN2/ LD pin is held HIGH during Reset so that this pin

operates a second Write Enable.

2. External logic is used to control the flow of data.

Please see the Applicatioin Note" DEPTH EXPANSION OF

IDT'S SYNCHRONOUS FIFOs USING THE RING COUNTER

APPROACH" for details of this configuration.

ORDERING INFORMATION

IDT XXXXX

X

Device Type Power

XX

Speed

X

Package

X

Process/

Temperature

Range

BLANK Commercial (0°C to +70°C)

B

Military (–55°C to +125°C)

Compliant to MIL-STD-883, Class B

J

Plastic Leaded Chip Carrier (PLCC)

L

Leadless Chip Carrier (LCC)

PF

Thin Quad Flat Pack (TQFP)

12

Com'l. (72421/72201/72211) Only

15

Com'l. Only

20

All except 72221/72231/72241 Military

25

35

50

Clock Cycle

Time (tCLK)

Speed in ns

L

Low Power

72421

72201

72211

72221

64 x 9 Synchronous FIFO

256 x 9 Synchronous FIFO

512 x 9 Synchronous FIFO

1024 x 9 Synchronous FIFO

2048 x 9 Synchronous FIFO

4096 x 9 Synchronous FIFO

2655 drw 18

5.07

19

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