Fact Sheet
Freescale Semiconductor, Inc.
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Product Description
Freescale Semiconductor, Inc...
F
AST
S
TATIC
RAM
S FOR THE
C
OMMUNICATIONS
M
ARKET
The ZBT
廬
RAM is a synchronous fast static RAM designed to provide 100% bus utilization. The ZBT RAM
eliminates dead bus cycles during back to back read/write and write/read cycles. These devices allow
efficient bus usage in high performance systems allowing maximum bus throughput for a given system topology.
The 4M-bit ZBT RAM is available in 128K x 36 and 256K x 18 configurations and comes in both pipeline and
flow through versions. A new 8M-bit version will be available in 256K x 36 and 512K x 18 configurations.
Simplified burst logic allows the ZBT RAM to perform well in burst applications. The pinout is also similar to
that of BurstRAMs, which simplifies the integration of ZBT parts into existing burst sockets. Address, data, and
control inputs are all synchronous to the clock input with the exception of the output enable (G) and linear
burst order (LBO) signals.
Write cycles are internally self timed and are initiated by the rising edge of the clock (CK) input. This feature
eliminates complex off chip write pulse generation and provides increased timing flexibility for incoming
signals.
For read cycles, pipelined ZBT RAM output data is temporarily stored by an edge triggered output register and
then released to the output buffers at the next rising edge of clock (CK).
Features
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Single 3.3 V and 2.5 V Power Supplies
Selectable Burst Order (Linear or
Interleaved)
Internally Self Timed Write
Byte Write Control
ADV Controlled Burst
Suggested Applications
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Switch/Hub Shared Fabric and Router
Tables
Network Interface Cards (NIC)
LAN and WAN Switches
Networking Computer
Gigabit Switching
Continued on back
REV 6
10/26/99
For More Information On This Product,
Go to: www.freescale.com
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