Features: Select 8192 x 18 or 16384x 9 organization (IDT72264)
Select 16384 x 18 or 32678 x 9 organization (IDT72274)
Flexible control of read and write clock frequencies
Reduced dynamic power dissipation
Auto power down minimizes power consumption
15 ns read/write cycle time (10 ns access time)
Retransmit Capability
Master Reset clears entire FIFO, Partial Reset clears data, but retains programmable settings
Empty, full and half-full flags signal FIFO status
Programmable almost empty and almost full flags, each flag can default to one of two preselected offsets
Program partial flags by either serial or parallel means
Select IDT Standard timing (using EF and FF flags) or First Word Fall Through timing (using OR and IR flags)
Easily expandable in depth and width
Independent read and write clocks (permits simultaneous reading and writing with one clock signal)
Available in the 64-pin Thin Quad Flat Pack (TQFP), 64-pin Slim Thin Quad Flat Pack (STQFP) and the 68-pin Pin Grid Array (PGA)
Output enable puts data outputs into high impedance
High-performance submicron CMOS technology
Industrial temperature range (-40 to +85) is avail-able, tested to military electrical specifications
Pinout
Specifications
| Symbol |
Rating |
Commercial |
Unit |
| VTERM |
Terminal Voltage
with respect to GND |
-0.5 to +7. |
V |
| TA |
Operating
Temperature |
0 to +70 |
|
| TBIAS |
Temperature Under
Bias |
-55 to +12 |
|
| TSTG |
Storage
Temperature |
-55 to +12 |
|
| IOUT |
DC Output Current |
50 |
mA |
DescriptionThe IDT72274 are monolithic, CMOS, high capac-ity, high speed, low power first-in, first-out (FIFO) memories
with clocked read and write controls. These FIFOs have three main features that distinguish them among SuperSync FIFOs:
First, the data path width can be changed from 9-bits to 18-bits; as a result,halving the depth. A pin called Memory Array Select (MAC) chooses between the two options.This feature helps reduce the need for redesigns or multiple versions of PC cards, since a single layout can be used for both data bus widths.
Second, IDT72274 offer the greatest flexibility for setting and varying the read and write clock (WCLK and
RCLK) frequencies. For example,given that the two clock frequencies are unequal, the slower clock may exceed the
faster by, at most, twice its frequency. This feature is espe-cially useful for communications and network applications where clock frequencies are switched to permit different data rates.
IDT72274 Data Sheet
