72255LA20TF IDT, 72255LA20TF Datasheet - Page 21

• Manufacturer Part Number: 72255LA20TF
• Description: FIFO
• Manufacturer: IDT

Specifications of 72255LA20TF

• Part # Aliases: IDT72255LA20TF

Q
IDT72255LA/72265LA CMOS SuperSync FIFO™
8,192 x 18 and 16,384 x 18
NOTES:
1. Retransmit setup is complete after OR returns LOW.
2. No more than D –2 words may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, IR will be LOW throughout the Retransmit setup
3. OE = LOW
4. W
5. OR goes LOW at 60 ns + 2 RCLK cycles + t
WCLK
NOTE:
1. X = 12 for the IDT72255LA and X = 13 for the IDT72265LA.
WCLK
RCLK
0
WEN
procedure. D = 8,193 for the IDT72255LA and 16,385 for the IDT72265LA.
REN
PAE
- Q
PAF
OR
1
HF
SI
RT
, W
n
2
, W
t
ENS
3
= first, second and third words written to the FIFO after Master Reset.
W
x
Figure 13. Serial Loading of Programmable Flag Registers (IDT Standard and FWFT Modes)
t
ENH
BIT 0
t
t
ENS
t
LDS
DS
t
ENS
t
RTS
t
RTS
REF
t
t
LDH
ENH
.
EMPTY OFFSET
t
t
REF
t
ENH
HF
t
SKEW4
1
Figure 12. Retransmit Timing (FWFT Mode)
2
t
PAF
1
W
x+1
BIT X
21
(1)
BIT 0
2
t
PAE
FULL OFFSET
COMMERCIAL AND INDUSTRIAL
3
t
A
t
ENH
t
REF
TEMPERATURE RANGES
(5)
W
1
(4)
BIT X
JANUARY 13, 2009
t
t
LDH
ENH
t
DH
(1)
W
4
2
t
A
4670 drw 16
t
ENH
4670 drw15
W
3