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PDF LF2249QC25 Data sheet ( Hoja de datos )
| Número de pieza | LF2249QC25 | |
| Descripción | 12 x 12-bit Digital Mixer | |
| Fabricantes | LOGIC Devices Incorporated | |
| Logotipo |  |
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DEVICES INCORPORATED
DEVICES INCORPORATED
LF2249
12 x 12-biLt DFig2ita2l 4Mi9xer
12 x 12-bit Digital Mixer
FEATURES
DESCRIPTION
u 40 MHz Data and Computation Rate
u Two 12 x 12-bit Multipliers with
Individual Data Inputs
u Separate 16-bit Input Port for
Cascading Devices
u Independent, User-Selectable 1–16
Clock Pipeline Delay for Each Data
Input
u User-Selectable Rounding of Products
u Fully Registered, Pipelined
Architecture
u Three-State Outputs
u Fully TTL Compatible
u Replaces TRW/Raytheon/Fairchild
TMC2249
u 120-pin PQFP
The LF2249 is a high-speed digital
mixer comprised of two 12-bit
multipliers and a 24-bit accumulator.
All multiplier inputs are user acces-
sible, and each can be updated on
every clock cycle. The LF2249 utilizes
a pipelined architecture with fully
registered inputs and outputs and an
asynchronous three-state output
enable control for optimum flexibility.
Independent input register clock
enables allow the user to hold the
data inputs over multiple clock cycles.
Each multiplier input also includes a
user-selectable 1-16 clock pipeline
delay. The output of each multiplier
can be independently negated under
user control for subtraction of prod-
ucts. The sum of the products can
also be internally rounded to 16 bits
during the accumulation process.
A separate 16-bit input port con-
nected to the accumulator is included
to allow cascading of multiple
LF2249s. Access to all 24 bits of the
accumulator is gained by switching
between upper or lower 16-bit words.
The accumulated output data is
updated on every clock cycle.
All inputs and outputs of the LF2249
are registered on the rising edge of
clock, except for OE. Internal pipeline
registers for all data and control
inputs are provided to maintain
1
2
3
4
5
6
LF2249 BLOCK DIAGRAM
ADEL3-0 A11-0 ENA
BDEL3-0 B11-0 ENB
CDEL3-0 C11-0 ENC
DDEL3-0 D11-0 END
7
8
CLK
NEG1
RND
FT
CAS15-0
CASEN
SWAP
1–16
1–16
1–16
1–16
4
4
16
2's COMP
2's COMP
16
3
24
MS 16
16 LS
10
2:1
01
2:1
4 NEG2
4 ACC
9
10
11
OE
NOTE: NUMBERS IN REGISTERS INDICATED
NUMBER OF PIPELINE DELAYS.
16
S15-0
Video Imaging Products
1 08/16/2000–LDS.2249-J
1 page  
DEVICES INCORPORATED
LF2249
12 x 12-bit Digital Mixer
SWITCHING CHARACTERISTICS
COMMERCIAL OPERATING RANGE (0°C to +70°C) Notes 9, 10 (ns)
Symbol Parameter
tCYC Cycle Time
tPWL Clock Pulse Width, LOW
tPWH Clock Pulse Width, HIGH
tS Input Setup Time
tH Input Hold Time
tD Output Delay
tENA Three-State Output Enable Delay (Note 11)
tDIS Three-State Output Disable Delay (Note 11)
11111111111111111111111111111111222222222222222222222222222222223333333333333333333333333333333344444444444444444444444444444444M4115555555555555555555555555555555500058in666666666666666666666666666666667777777777777777777777777777777748888888888888888888888888888888899999999999999999999999999999999000000000000000000000000000000000* 11111111111111111111111111111111M2222222222222222222222222222222211133333333333333333333333333333333a75544444444444444444444444444444444x555555555555555555555555555555556666666666666666666666666666666677777777777777777777777777777777
LF2249-
33
Min Max
33
15
10
8
0
15
15
15
25
Min Max
25
10
10
7
0
14
15
15
1
2
3
4
MILITARY OPERATING RANGE (–55°C to +125°C) Notes 9, 10 (ns)
Symbol Parameter
tCYC Cycle Time
tPWL Clock Pulse Width, LOW
tPWH Clock Pulse Width, HIGH
tS Input Setup Time
tH Input Hold Time
tD Output Delay
tENA Three-State Output Enable Delay (Note 11)
tDIS Three-State Output Disable Delay (Note 11)
5
111111111111111111111111111111112222222222222222222222222222222233333333333333333333333333333333M41144444444444444444444444444444440005855555555555555555555555555555555in6666666666666666666666666666666677777777777777777777777777777777488888888888888888888888888888888099999999999999999999999999999999*0000000000000000000000000000000011111111111111111111111111111111M11122222222222222222222222222222222a755L33333333333333333333333333333333x44444444444444444444444444444444F55555555555555555555555555555555266666666666666666666666666666666277777777777777777777777777777777488888888888888888888888888888888999999999999999999999999999999999M-3110000000000000000000000000000000008305i11111111111111111111111111111111n222222222222222222222222222222223333333333333333333333333333333344444444444444444444444444444444355555555555555555555555555555555*66666666666666666666666666666666M7777777777777777777777777777777711188888888888888888888888888888888a55599999999999999999999999999999999x000000000000000000000000000000001111111111111111111111111111111122222222222222222222222222222222
6
7
8
9
10
SWITCHING WAVEFORMS
CLK
A11-0 – D11-0
CONTROLS
(Except OE)
S15-0*
OE
1
tH
N
tS
2
tPWH
N+1
3
tPWL
N+2
tDIS
HIGH IMPEDANCE
tENA
6
tD
7 8 11
SN
SN + 1
SN + 2
*Assumes ADEL–DDEL = 0000
111*222D333I444S555C666O777N888TI999N000U111E222D333S444P555E666E777D888999G000R111A222D333E444
Video Imaging Products
5 08/16/2000–LDS.2249-J
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LF2249QC25.PDF ] | |
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