4-Mbit (128K x 36) Pipelined Sync SRAM
CY7C1347G
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
, CA 95134-1709
•
408-943-2600
Document #: 38-05516 Rev. *E
Revised May 22, 2007
Features
• Fully registered inputs and outputs for pipelined operation
• 128K x 36 common IO architecture
• 3.3V core power supply (VDD)
• 2.5V/3.3V I/O power supply (VDDQ)
• Fast clock-to-output times
— 2.6 ns (for 250-MHz device)
• User-selectable burst counter supporting Intel® Pentium®
interleaved or linear burst sequences
• Separate processor and controller address strobes
• Synchronous self-timed writes
• Asynchronous output enable
• Offered in lead-free 100-Pin TQFP, lead-free and non-
lead-free 119-Ball BGA package and 165-Ball FBGA
package
• “ZZ” sleep mode option and stop clock option
• Available in industrial and commercial temperature ranges
Functional Description[1]
The CY7C1347G is a 3.3V, 128K x 36 synchronous-pipelined
SRAM designed to support zero-wait-state secondary cache
with minimal glue logic. CY7C1347G IO pins can operate at
either the 2.5V or the 3.3V level; the IO pins are 3.3V tolerant
when VDDQ = 2.5V. All synchronous inputs pass through input
registers controlled by the rising edge of the clock. All data
outputs pass through output registers controlled by the rising
edge of the clock. Maximum access delay from the clock rise
is 2.6 ns (250 MHz device). CY7C1347G supports either the
interleaved burst sequence used by the Intel Pentium
processor or a linear burst sequence used by processors such
as the PowerPC®. The burst sequence is selected through the
MODE pin. Accesses can be initiated by asserting either the
Address Strobe from Processor (ADSP) or the Address Strobe
from Controller (ADSC) at clock rise. Address advancement
through the burst sequence is controlled by the ADV input. A
2-bit on-chip wraparound burst counter captures the first
address in a burst sequence and automatically increments the
address for the rest of the burst access.
Byte write operations are qualified with the four Byte Write
Select (BW[A:D]) inputs. A Global Write Enable (GW) overrides
all byte write inputs and writes data to all four bytes. All writes
are conducted with on-chip synchronous self-timed write
circuitry.
Three synchronous Chip Selects (CE1, CE2, CE3) and an
asynchronous Output Enable (OE) provide for easy bank
selection and output tri-state control. In order to provide proper
data during depth expansion, OE is masked during the first
clock of a read cycle when emerging from a deselected state.
Selection Guide
250 MHz
200 MHz
166 MHz
133 MHz
Unit
Maximum Access Time
2.6
2.8
3.5
4.0
ns
Maximum Operating Current
325
265
240
225
mA
Maximum CMOS Standby Current
40
40
40
40
mA
Note
1. For best practice recommendations, refer to the Cypress application note AN1064, SRAM System Guidelines.
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