IDT72T7285L4-4BB IDT, Integrated Device Technology Inc, IDT72T7285L4-4BB Datasheet - Page 47

• Manufacturer Part Number: IDT72T7285L4-4BB
• Description: IC FIFO 16384X72 4-4NS 324-BGA
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: 72Tr

Specifications of IDT72T7285L4-4BB

• Access Time: 3.2ns
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 324-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Supply: -
• Function: -
• Memory Size: -
• Data Rate: -
• Other names: 72T7285L4-4BB

NOTE:
1. The O/P Register is the internal output register. Its contents are available on the Qn output bus only when RCS and OE are both active, LOW, that is the bus is not in High-
2. OE is LOW.
Cycle:
a&b. At this point the FIFO is empty, OR is HIGH.
c.
d .
e.
f.
g .
h .
i .
16,384 x 72, 32,768 x 72, 65,536 x 72, 131,072 x 72
D0 - Dn
ERCLK
Impedance state.
WCLK
EREN
RCLK
WEN
REN
RCS
Reg.
O/P
OR
Qn
RCS and REN are both disabled, the output bus is High-Impedance.
Word Wn+1 falls through to the output register, OR goes active, LOW.
RCS is HIGH, therefore the Qn outputs are High-Impedance. EREN goes LOW to indicate that a new word has been placed on the output register.
EREN goes HIGH, no new word has been placed on the output register on this cycle.
No Operation.
RCS is LOW on this cycle, therefore the Qn outputs go to Low-Impedance and the contents of the output register (Wn+1) are made available.
NOTE: In FWFT mode is important to take RCS active LOW at least one cycle ahead of REN, this ensures the word (Wn+1) currently in the output register is made
available for at least one cycle.
REN goes active LOW, this reads out the second word, Wn+2.
EREN goes active LOW to indicate a new word has been placed into the output register.
Word Wn+3 is read out, EREN remains active, LOW indicating a new word has been read out.
NOTE: Wn+3 is the last word in the FIFO.
This is the next enabled read after the last word, Wn+3 has been read out. OR flag goes HIGH and EREN goes HIGH to indicate that there is no new word available.
HIGH-Z
t
ENS
t
DS
W
t
ERCLK
n+1
W
t
DH
n
t
Last Word
SKEW1
t
DS
Figure 29. Echo RCLK and Echo REN
a
W
n+2
t
DH
1
b
t
DS
W
n+3
t
DH
2
t
ENH
c
t
t
t
REF
CLKEN
A
d
47
REN
REN
REN
REN Operation (FWFT Mode Only)
t
CLKEN
e
W
n+1
t
ENS
f
t
RCSLZ
t
ENS
W
n+1
g
COMMERCIAL AND INDUSTRIAL
t
t
t
A
A
CLKEN
W
W
n+2
n+2
TEMPERATURE RANGES
h
t
t
A
A
W
W
i
n+3
t
n+3
ENH
t
t
REF
CLKEN
5994 drw34