16
CORPORATE HEADQUARTERS for SALES: for Tech Support:
6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 408-360-1753
San Jose, CA 95138 fax: 408-284-2775 email: FIFOhelp@idt.com
www.idt.com
DEPTH EXPANSION — These FIFOs can be adapted to applications that
require greater than 256/512/1,024/2,048/4,096/8,192 words. The exist-
ence of double enable pins on the read and write ports allow depth expansion.
The Write Enable 2/Load (WENA2, WENB2) pins are used as a second write
enables in a depth expansion configuration, 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 controlled 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.
ORDERING INFORMATION
The IDT72V801/72V811/72V821/72V831/72V841/72V851 operates in the
Depth Expansion configuration when the following conditions are met:
1. WENA2/LDA and WENB2/LDB pins are held HIGH during Reset so that
these pins operate as second Write Enables.
2. External logic is used to control the flow of data.
Please see the Application Note "DEPTH EXPANSION OF IDT'S SYN-
CHRONOUS FIFOs USING THE RING COUNTER APPROACH" for
details of this configuration.
NOTES:
1. Industrial temperature range product for the 15ns speed grade is available as a standard device.
2. Green parts available. For specific speeds and packages contact your local sales office.
3. TF package is End of Life. Last time buy is July 28, 2015.
XXXXX
Device Type
X
Power
XX
Speed
X
Package
X
Process /
Temperature
Range
X X
Tube or Tray
Tape and Reel
BLANK
8
BLANK
4093 drw 20
Clock Cycle Time
(t
CLK), speed in
Nanoseconds
Commercial (0°C to +70°C)
Commercial Only
I
(1)
Industrial (-40°C to +85°C)
PF
TF
(3)
Thin Quad Flatpack (TQFP, PN64)
Slim Thin Plastic Quad Flatpack (STQFP, PP64)
10
15
20
Commercial And Industrial
Commercial Only
L
Low Power
72V801
256 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
72V811
512 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
72V821
1,024 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
72V831
2,048 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
72V841
4,096 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
72V851
8,192 x 9 ⎯ 3.3 Volt DUAL SyncFIFO
G
(2)
Green
DATASHEET DOCUMENT HISTORY
04/24/2001 pgs. 4, 5 and 16
02/02/2006 pgs. 1 and 16.
10/22/2008 pg. 16.
11/06/2014 pg. 1, 2 and 16.
