IDT72251 datasheet(16/17 Pages) IDT

Part #	IDT72251

Description	CMOS SyncFIFOO 8192 X 9

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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5.14

16

IDT72251 CMOS SyncFIFO

™

8192 x 9

COMMERCIAL TEMPERATURE RANGES

Figure 15. Block Diagram of 8192 x 18 Synchronous FIFO

Used in a Width Expansion Configuration

OPERATING CONFIGURATIONS

SINGLE DEVICE CONFIGURATION - A single IDT72251

may be used when the application requirements are for 8192

words or less. When the IDT72251 is in a Single Device

using two IDT72251. Any word width can be attained by

adding additional IDT72251s.

When the IDT72251is in a Width Expansion Configuration,

the Read Enable 2 (

REN2) control input can be grounded (see

Figure 15). In this configuration, the Write Enable 2/Load

(WEN2/

LD) pin is set LOW at Reset so that the pin operates

as a control to load and read the programmable flag offsets.

Figure 14. Block Diagram of Single 8192 x 9 Synchronous FIFO

WIDTH EXPANSION CONFIGURATION - Word width may

be increased simply by connecting the corresponding input

controls signals of multiple devices. A composite flag should

be created for each of the end-point status flags (

EF and FF).

The partial status flags (

AE and AF) can be detected from any

one device. Figure 15 demonstrates a 18-bit word width by

Configuration, the Read Enable 2 (

REN2) control input can be

grounded (see Figure 14). In this configuration, the Write

Enable 2/Load (WEN2/

LD) pin is set LOW at Reset so that the

pin operates as a control to load and read the programmable

flag offsets.

DATA IN (D)

WRITE CLOCK (WCLK)

18

9

RESET (

)

READ CLOCK (RCLK)

DATA OUT (Q)

9

18

READ ENABLE 2 (

)

READ ENABLE 2 (

)

WRITE ENABLE1 (

)

FULL FLAG (

) #1

PROGRAMMABLE (

)

PROGRAMMABLE (

)

EMPTY FLAG (

) #2

OUTPUT ENABLE (

)

READ ENABLE (

)

9

WRITE ENABLE2/LOAD (WEN2/

)

IDT

72251

FULL FLAG (

) #2

EMPTY FLAG (

) #1

RESET (

)

IDT

72251

3545 drw 17

DATA OUT (Q0 - Q8)

DATA IN (D0 - D8)

RESET (

)

READ CLOCK (RCLK)

READ ENABLE 1 (

)

OUTPUT ENABLE (

)

EMPTY FLAG (

)

PROGRAMMABLE ALMOST EMPTY (

)

READ ENABLE 2 (

)

WRITE CLOCK (WCLK)

WRITE ENABLE 1 (

)

WRITE ENABLE 2/LOAD (WEN2/

)

FULL FLAG (

)

PROGRAMMABLE ALMOST FULL (

)

IDT

72251

3545 drw 16

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