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CGS2535V Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. CGS2535V
Description  Commercial Quad 1 to 4 Clock Drivers/Industrial Quad 1 to 4 Clock Drivers
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

CGS2535V Datasheet(HTML) 5 Page - National Semiconductor (TI)

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CGS2534/35/36/37
Memory Array Driving
In order to minimize the total load on the address bus, quite
often memory arrays are driven by buffers while having the
inputs of the buffers tied together. Although this practice was
feasible in the conventional memory designs, in today’s high
speed, large buswidth designs which require address fetch-
ing at higher speeds, this technique produces many undes-
ired results such as cross-talk and over/undershoot.
CGS2534/35/36/37 Quad 1 to 4 clock drivers were designed
specifically to address these application issues on high
speed, large memory arrays systems.
These drivers are optimized to drive large loads, with 3.5 ns
propagation delays. These drivers produce less noise while
reducing the total capacitive loading on the address bus by
having only four inputs tied together (see the diagram below,
point A). This helps to minimize the overshoot and under-
shoot by having only four outputs being switched simulta-
neously.
Also this larger fan-out helps to save board space since for
every one of these drivers, two conventional buffers were
typically being used.
Another feature associated with these clock drivers is a
350 ps pin-to-pin skew specification. The minimum skew
specification allows high speed memory system designers to
optimize the performance of their memory sub-system by
operating at higher frequencies without having concerns
about output-to-output (bank-to-bank) synchronization prob-
lems which are associated with driving high capacitive loads
(Point B).
The diagram below depicts a “2534/35/36/37” a memory
subsystem operating at high speed with large memory ca-
pacity. The address bus is common to both the memory and
the CPU and I/Os.
These drivers can operate beyond 125 MHz, and are also
available in 3V–5V TTL/CMOS versions with large current
drive .
Device
V
CC
I/O
Output Configuration
2534
5
TTL
Inverting quad 1–4
2535
3 or 5
CMOS
Non-inverting quad 1–4
2536
3 or 5
CMOS
Inverting, Non-inverting, ÷2
2537
5
TTL
Inverting quad 1–4 with series 8
Ω output resistors
DS011954-8
5
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