 |
Error-resistant
3T-iRAM® technology |
|
300
to 375 MHz clock for high bandwidth |
|
Read
latency of 2 clock cycles |
|
DTRII+™
Interface with Common I/O bus |
|
Fully
pin-compatible with DDRII+™ SRAMs |
|
Lead-free
JEDEC-standard
pinout and package |
|
Burst
of 2 Read and Write (Byte Writes) |
|
1.8
V core power supply, 1.5
V I/O |
|
Synchronous
internally self-timed Writes |
|
ZQ
pin for programmable output drive strength |
|
QVLD
pin indicates valid output data |
|
DLL
for accurate data placement |
|
IEEE
1149.1 JTAG-compliant Boundary Scan |
|
165-bump
15mm x 17mm BGA, 1 mm bump pitch |
|
Pin-compatible
with 9Mb, 18Mb, 36Mb, and 144Mb devices |
3T-iRAM® is a unique type
of dynamic memory. Tezzaron has crafted these pseudo-static devices to
provide entirely SRAM-compatible interfaces and timing. The unique design
of these 3T memories provides soft error rates up to 10 times lower than
equivalent high-speed, high-density SRAMs.
DTRII+™ is a double
transfer rate interface that is implemented with Common I/O architecture
in these devices, making them drop-in compatible with DDRII+ SRAMs.
These synchronous pipelined
72Mb 3T-iRAM devices employ two register clocks. These are independent
single-ended clock inputs, not differential inputs. All synchronous inputs
pass through registers controlled by these clocks. Accesses are initiated
on the rising edge of the positive clock and data is registered or driven
on the rising edges of both clocks. Write (input) and Read (output) data
share the same data pins. Data outputs are tightly matched to two
free-running echo clocks which are referenced with respect to the register
clocks. Data inputs are controlled by self-timed Write circuitry.
These devices always
transfer data in two packets. A0 is internally set to 0 for the first
transfer of a data burst and automatically incremented to 1 for the second
transfer.
