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IDT7381L25J Datasheet

  • IDT7381L25J

  • Fixed Point ALU

  • 17頁(yè)

  • ETC

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IDT7381
16-BIT CASCADABLE ALU
COMMERCIAL TEMPERATURE RANGE
16-BIT CMOS
CASCADABLE ALU
IDT7381
FEATURES:
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High-performance 16-bit Arithmetic Logic Unit (ALU)
25ns to 55ns clocked ALU operations
Ideal for radar, sonar or image processing applications
74S381 instruction set (8 functions)
Replaces Gould S614381 or Logic Devices L4C381
Cascadable with or without carry look-ahead
Pipeline or flow-through modes
Internal feedback path for accumulation
Three-state outputs
TTL-compatible
Produced with advanced submicron CMOS technology
Available in PLCC
Speeds available: L/25/30/40/55
DESCRIPTION:
The IDT7381 is a high-speed cascadable Arithmetic Logic Unit (ALU).
These three-bus devices have two input registers, an ultra-fast 16-bit ALU
and 16-bit output register. With IDT鈥檚 high-performance CMOS technology,
the IDT7381 can do arithmetic or logic operations in 25ns. The IDT7381
functionally replaces four 54/74S381 four-bit ALUs in a 68-pin package.
The two input operands, A and B, can be clocked or fed through for
flexible pipelining. The F output can also be set into clocked or flow-through
mode. An output enable is provided for three-state control of the output port
on a bus.
The IDT7381 has three function pins to select 1 of 8 arithmetic or logic
operations. The two R and S selection pins determine whether A, B, F or
0 are fed into the ALU. This ALU has carry-out, propagate and generate
outputs for cascading using carry look-ahead.
FUNCTIONAL BLOCK DIAGRAM
A
0
-1 5
B
0
-1 5
16
16
ENA
A R EG
B R EG
CL K
ENB
A MUX
0000 H
R MUX
0000 H
B MUX
FT AB
S MUX
2
RS
0
-1
C
1 6
OVF
Z
P
G
I
16-BIT ALU
3
0-2
C
0
EN F
F RE G
FTF
F M UX
PO W E R
SU P P LY
16
F
0
- 15
GND
V
CC
OE
COMMERCIAL TEMPERATURE RANGE
1
c
2001
Integrated Device Technology, Inc.
APRIL 2001
DSC-2525/-

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