IDT72275 IDT [Integrated Device Technology], IDT72275 Datasheet - Page 2

• Manufacturer Part Number: IDT72275
• Manufacturer: IDT [Integrated Device Technology]

IDT72275/72285 SUPERSYNC FIFO™
32,768 x 18, 65,536 x 18
DESCRIPTION (Continued)
PIN CONFIGURATIONS
SuperSync FIFOs are particularly appropriate for network,
video, telecommunications, data communications and other
applications that need to buffer large amounts of data.
and a Write Enable (
on every rising edge of WCLK when
output port is controlled by a Read Clock (RCLK) input and
Read Enable (
rising edge of RCLK when
(
may vary from 0 to f
are no restrictions on the frequency of the one clock input with
respect to the other.
OE
delay associated with the latency period found on previous
SuperSync devices has been eliminated on this SuperSync
family.)
The input port is controlled by a Write Clock (WCLK) input
The frequencies of both the RCLK and the WCLK signals
) input is provided for three-state control of the outputs.
REN
PIN 1
) input. Data is read from the FIFO on every
MAX
WEN
GND
D17
D16
D15
D14
D13
D12
D11
D10
V
DC
D9
D8
D7
CC
with complete independence. There
) input. Data is written into the FIFO
REN
is asserted. An Output Enable
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
WEN
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
is asserted. The
TQFP (PN64-1, order code: PF)
STQFP (PP64-1, order code: TF)
TOP VIEW
these devices: IDT Standard mode and First Word Fall Through
(FWFT) mode.
FIFO will not appear on the data output lines unless a specific
read operation is performed. A read operation, which consists
of activating
the word from internal memory to the data output lines.
clocked directly to the data output lines after three transitions
of the RCLK signal. A
accessing the first word. However, subsequent words written
to the FIFO do require a LOW on
of the FWFT/SI input during Master Reset determines the
timing mode in use.
a single FIFO can provide, the FWFT timing mode permits
depth expansion by chaining FIFOs in series (i.e. the data
In IDT Standard mode, the first word written to an empty
In FWFT mode, the first word written to an empty FIFO is
For applications requiring more data storage capacity than
There are two possible timing modes of operation with
REN
and enabling a rising RCLK edge, will shift
REN
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
COMMERCIAL TEMPERATURE RANGE
does not have to be asserted for
4674 drw 02
REN
Q17
Q16
GND
Q15
Q14
V
Q13
Q12
Q11
GND
Q10
Q9
Q8
Q7
Q6
GND
for access. The state
CC
2