27

©

16,384 x 9

32,768 x 9

IDT72V261LA

IDT72V271LA

ADDENDUM

DIFFERENCES BETWEEN THE IDT72V261LA/72V271LA AND IDT72V261L/72V271L

IDT has improved the performance of the IDT72V261/72V271 SuperSync™ FIFOs. The new versions are designated by the “LA” mark. The LA

part is pin-for-pin compatible with the original “L” version. Some difference exist between the two versions. The following table details these differences.

Item

NEW PART

OLD PART

Comments

IDT72V261LA

IDT72V261L

IDT72V271LA

IDT72V271L

Pin #3

DC (Don’t Care) - There is

FS (Frequency Select)

In the LA part this pin must be tied

no restriction on WCLK and

RCLK. See note 1.

not toggle after reset.

First Word Latency

(3)

(IDT Standard Mode)

a fixed value, independent of the

frequency of RCLK or WCLK.

First Word Latency

(3)

(FWFT Mode)

a fixed value, independent of the

frequency of RCLK or WCLK.

Retransmit Latency

(3)

(IDT Standard Mode)

a fixed value, independent of the

frequency of RCLK or WCLK.

Retransmit Latency

(3)

(FWFT Mode)

a fixed value, independent of the

frequency of RCLK or WCLK.

55mA

150mA

Active supply current

20mA

15mA

Standby current

Not Given

NOTES:

1. WCLK and RCLK can vary independently and can be stopped. There is no restriction on operating WCLK and RCLK.

3. Tf is the period of the ‘selected clock’.

2009 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.

IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The SuperSync is a trademark of Integrated Device Technology, Inc.

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES