IDT72805LB(1996) 데이터 시트보기 (PDF) - Integrated Device Technology

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IDT72805LB
(Rev.:1996)

CMOS DUAL SyncFIFO DUAL 256 x 18, DUAL 512 x 18, DUAL 1024 x 18

Integrated Device Technology 

IDT72805/72815/72825 CMOS Dual SyncFIFO™

256 x 18, 512 x 18, and 1024 x 18

COMMERCIAL TEMPERATURE RANGE

DESCRIPTION (CONTINUED)

The output port of each FIFO bank is controlled by a Read

Clock pin (RCLK) and a Read Enable pin (REN). The Read

Clock can be tied to the Write Clock for single clock operation or

the two clock lines can run asynchronously to one another for

dual clock operation. An Output Enable pin (OE) is provided on

the read port of each FIFO for three-state output control.

Each of the two FIFOs has fixed flags, an Empty (EF) and a

Full (FF). Two kinds of programmable flags, an Almost-Empty

(PAE) and an Almost-Full (PAF), are provided to improve the

utilization of each FIFO memory bank. The offset loading of the

programmable flags is controlled by a simple state machine and

is initiated by asserting the load pin (LD). A Half-Full flag

(HF) is available for each FIFO that is implemented as a

single device.

The IDT72805LB/72815LB/72825LB are depth expand-

able using a daisy-chain technique. A set of expansion pins

(XI and XO) are provided for each FIFO. In depth expansion

configuration, FL is grounded on the first device and set high

for all other devices in the daisy-chain.

The IDT72805LB/72815LB/72825LB is fabricated using

IDT's high speed submicron CMOS technology.

PIN CONFIGURATION

PIN 1

A

WCLKA DA3 DA1

DA0 DB13 DB16 RCLKB LDB

RSB QB17 QB16

B

PAFA DA4 WENA DA2 DB12 DB15 RENB OEB EFB QB15 QB14

C

FFA RXIA WXIA DA5 DB14 DB11 GND DB17 GND QB13 QB11

D

RXOA QA0 QA2

FLA

DB8 DB10 DB7

VCC QB12 QB10 QB8

E

QA1

QA4

QA3

WXOA/

HFA

PAEA

DB9

DB6

VCC

VCC

QB9

QB7

F

QA5 QA6 GND VCC GND GND GND VCC GND QB6 QB5

G

QA7

QA9 VCC VCC

DA6

DA9

PAEB

WXOB/

HFB

QB3

QB4

QB1

H

QA8 QA10 QA12 VCC

DA7 DA10 DA8

FLB QB2 QB0 RXOB

J

QA11 QA13 GND DA17 GND DA11 DA14 DB5 WXIB RXIB FFB

K

QA14 QA15 EFA OEA RENA DA15 DA12 DB2 WENB DB4 PAFB

L

QA16 QA17 RSA

LDA RCKLA DA16 DA13 DB0

DB1 DB3 WCLKB

1

2

3

4

5

6

7

8

9

10

11

BGA

3139 drw 02

(BG 121-1)

TOP VIEW

5.17

2

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