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IDT72V81 Datasheet(PDF) 9 Page - Integrated Device Technology

Part No. IDT72V81
Description  3.3 Volt CMOS DUAL ASYNCHRONOUS FIFO DUAL 512 x 9, DUAL 1,024 x 9 DUAL 2,048 x 9, DUAL 4,096 X 9
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Maker  IDT [Integrated Device Technology]
Homepage  http://www.idt.com
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IDT72V81 Datasheet(HTML) 9 Page - Integrated Device Technology

 
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9
Commercial Temperature Range
IDT72V81/72V82/72V83/72V84/72V85
TABLE II—RESET AND FIRST LOAD TRUTH TABLE
Depth Expansion/Compound Expansion Mode
Inputs
Internal Status
Outputs
Mode
RS
RS
RS
RS
RS
FL
FL
FL
FL
FL
XI
XI
XI
XI
XI
Read Pointer
Write Pointer
EF
EF
EF
EF
EF
FF
FF
FF
FF
FF
Reset First Device
0
0
(1)
LocationZero
LocationZero
0
1
Reset All Other Devices
0
1
(1)
LocationZero
LocationZero
0
1
Read/Write
1
X
(1)
X
X
X
X
NOTE:
1.
XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output,
XI = Expan-
sion Input,
HF = Half-Full Flag Output
TABLE I—RESET AND RETRANSMIT
Single Device Configuration/Width Expansion Mode
Inputs
Internal Status
Outputs
Mode
RS
RS
RS
RS
RS
RT
RT
RT
RT
RT
XI
XI
XI
XI
XI
Read Pointer
Write Pointer
EF
EF
EF
EF
EF
FF
FF
FF
FF
FF
HF
HF
HF
HF
HF
Reset
0
X
0
LocationZero
LocationZero
0
1
1
Retransmit
1
0
0
LocationZero
Unchanged
X
X
X
Read/Write
1
1
0
Increment
(1)
Increment
(1)
XX
X
NOTE:
1. Pointer will increment if flag is High.
Figure 14. Block Diagram of 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9 and 32,768 x 9 FIFO Memory (Depth Expansion)
D
W
FFB
EFB
FLB
XOB
RSA
FULL
EMPTY
V CC
R
9
9
99
XIB
9
Q
FFA
EFA
FLA
XOA
XIA
FFB
EFB
FLB
XIB
3966 drw 16
XOA
FIFO A
FIFO B
FIFO A
FIFO B
XIA
XOB
EFA
FLA
FFA
72V81/72V82
72V83/72V84
72V85
72V81/72V82
72V83/72V84
72V85


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