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LMU112PC25 Datasheet(PDF) 1 Page - LOGIC Devices Incorporated

Part # LMU112PC25
Description  12 x 12-bit Parallel Multiplier
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Manufacturer  LODEV [LOGIC Devices Incorporated]
Direct Link  http://www.logicdevices.com
Logo LODEV - LOGIC Devices Incorporated

LMU112PC25 Datasheet(HTML) 1 Page - LOGIC Devices Incorporated

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DEVICES INCORPORATED
LMU112
12 x 12-bit Parallel Multiplier
Multipliers
08/16/2000–LDS.112-K
1
u
u
u
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u 25 ns Worst-Case Multiply Time
u
u
u
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u Low Power CMOS Technology
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u Replaces Fairchild MPY112K
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u
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u Two’s Complement or Unsigned
Operands
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u Three-State Outputs
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u Package Styles Available:
• 48-pin PDIP
• 52-pin PLCC, J-Lead
FEATURES
DESCRIPTION
LMU112
12 x 12-bit Parallel Multiplier
DEVICES INCORPORATED
The LMU112 is a high-speed, low
power 12-bit parallel multiplier built
using advanced CMOS technology.
The LMU112 is pin and functionally
compatible with Fairchilds’s MPY112K.
The A and B input operands are
loaded into their respective registers
on the rising edge of the separate
clock inputs (CLK A and CLK B).
Two’s complement or unsigned
magnitude operands are accommo-
dated via the operand control bit (TC)
LMU112 BLOCK DIAGRAM
A REGISTER
CLK A
CLK B
12
12
24
OE
B11-0
A11-0
R23-8
TC
FORMAT ADJUST
16
B REGISTER
RESULT REGISTER
16
which is loaded along with the B
operands. The operands are specified
to be in two’s complement format
when TC is asserted and unsigned
magnitude when TC is deasserted.
Mixed mode operation is not allowed.
For two’s complement operands, the
17 most significant bits at the output
of the asynchronous multiplier array
are shifted one bit position to the left.
This is done to discard the redundant
copy of the sign-bit, which is in the
most significant bit position, and
extend the bit precision by one bit.
The result is then truncated to the 16
MSB’s and loaded into the output
register on the rising edge of CLK B.
The contents of the output register are
made available via three-state buffers
by asserting OE. When OE is de-
asserted, the outputs (R23-8) are in the
high impedance state.


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