LOGIC LMA2009JC45, LMA2009JC20 Datasheet

DEVICES INCORPORATED

LMA 1009/2009

12 x 12-bit Multiplier-Accumulator

LMA1009/2009

DEVICES INCORPORATED

12 x 12-bit Multiplier-Accumulator

FEATURES DESCRIPTION

❑❑

❑ 20 ns Multiply-Accumulate Time

❑❑
❑❑

❑ Low Power CMOS Technology

❑❑
❑❑

❑ Replaces Fairchild TDC1009/

❑❑

TMC2009

❑❑

❑ Two’s Complement or Unsigned

❑❑

Operands

❑❑

❑ Accumulator Performs Preload,

❑❑

Accumulate, and Subtract

❑❑

❑ Three-State Outputs

❑❑
❑❑

❑ 68-pin PLCC, J-Lead

❑❑

The LMA1009 and LMA2009 are high-
speed, low power 12-bit multiplier-accu­mulators. They are pin-for-pin equiva­lent to the TRW TDC1009/TMC2009
multiplier-accumulators. The LMA1009
and LMA2009 are functionally identical;
they differ only in packaging. Full ambi­ent temperature range operation is
achieved by the use of advanced CMOS
technology.

The LMA1009/2009 produces the 24-bit
product of two 12-bit numbers. The
results of a series of multiplications may
be accumulated to form the sum of prod­ucts. Accumulation is performed to
27-bit precision with the multiplier prod­uct sign extended as appropriate.

LMA1009/2009 BLOCK DIAGRAM

A

11-0

12 12

CLK A
CLK B

RND

TC
ACC
SUB

OEX

OEM

OEL

PREL

CLK R ACCUMULATOR

PRELOAD
CONTROL

LOGIC

REGISTER

3

3

OEX
OEM
OEL

LEX
LEM
LEL

27

A REGISTER B REGISTER

R
R + A

R – A

PASS R

LEM LELLEX

3 12 12

OEX

3

R

R

26-24

23-12

24

OEM

12

B

11-0

A

27

REGISTER

R

11-0

12

OEL

Data present at the A and B input regis­ters is latched on the rising edges of
CLK A and CLK B respectively. RND,
TC, ACC, and SUB controls are latched
on the rising edge of the logical OR of
CLK A and CLK B. TC specifies the input
as two’s complement
(TC HIGH) or unsigned magnitude
(TC LOW). RND, when HIGH, adds ‘1’
to the most significant bit position of the
least significant half of the product. Sub­sequent truncation of the 12 least signifi­cant bits produces a result correctly
rounded to 12-bit precision.

The ACC and SUB inputs control accu­mulator operation. ACC HIGH results in
addition of the multiplier product and
the accumulator contents, with the result
stored in the accumulator register on the
rising edge of CLK R. ACC and SUB
HIGH results in subtraction of the accu­mulator contents from the multiplier
product, with the result stored in the
accumulator register. With ACC LOW
and SUB LOW, no accumulation occurs
and the next product is loaded directly
into the accumulator register. ACC LOW
and SUB HIGH is undefined.

The LMA1009/2009 output register (ac­cumulator register) is divided into three
independently controlled sections. The
least significant result (LSR) and most
significant result (MSR) registers are 12
bits in length. The extended result regis­ter (XTR) is 3 bits long.

Each output register has an independ­ent output enable control. In addition
to providing control of the three-state
output buffers, when OEX, OEM, or
OEL are HIGH and PREL is HIGH, data
can be preloaded via the bidirectional
output pins into the respective output
registers. Data present on the output
pins is latched on the rising edge of
CLK R. The interrelation of PREL and
the enable controls is summarized in
Table 1.

Multiplier-Accumulators

1

03/29/2000–LDS.10/2009-L

DEVICES INCORPORATED

LMA 1009/2009

12 x 12-bit Multiplier-Accumulator

TABLE 1. PRELOAD TRUTH TABLE

PREL OEX OEM OEL XTR MSR LSR

L L L L OUT OUT OUT
L L L H OUT OUT Z
L L H L OUT Z OUT
L L H H OUT Z Z
L H L L Z OUT OUT
L H L H Z OUT Z
L H H L Z Z OUT

LHHHZZZ
HL LLZZZ
H L L H Z Z PREL
H L H L Z PREL Z
H L H H Z PREL PREL
H H L L PREL Z Z
H H L H PREL Z PREL
H H H L PREL PREL Z
H H H H PREL PREL PREL

PREL= Preload data to appropriate register
OUT = Register available on output pins
Z = High impedance state

FIGURE 1A.INPUT FORMATS

A

IN

Fractional Two’s Complement (TC = 1)

11 10 9 2 1 0

0

–2

(Sign)

11 10 9 2 1 0

11

–2

(Sign)

11 10 9 2 1 0

–12–22–3

2

11 10 9 2 1 0

1121029

2

2–12

2102

–2

2–92

–102–11

Integer Two’s Complement (TC = 1)

9

22212

Unsigned Fractional (TC = 0)

–102–112–12

2

Unsigned Integer (TC = 0)

22212

B

IN

11 10 9 2 1 0

–2

(Sign)

0

2–12

–2

2–92

–102–11

11 10 9 2 1 0

0

11

–2

(Sign)

2102

9

22212

0

11 10 9 2 1 0

–12–22–3

2

–102–112–12

2

11 10 9 2 1 0

0

1121029

2

22212

0

FIGURE 1B.OUTPUT FORMATS

XTR

26 25 24

4

–2

(Sign)

26 25 24

26

–2

(Sign)

26 25 24

22120

2

26 25 24

26225224

2

232

2252

2

24

MSR LSR

Fractional Two’s Complement

23 22 21 14 13 12

1202–1

2

2–82–92

–10

Integer Two’s Complement

23 22 21 14 13 12

23222221

2

2142132

Unsigned Fractional

23 22 21 14 13 12

–12–22–3

2

–102–112–12

2

Unsigned Integer

23 22 21 14 13 12

23222221

2

2142132

11 10 9 2 1 0

–112–122–13

2

–202–212–22

2

11 10 9 2 1 0

12

1121029

2

22212

0

11 10 9 2 1 0

–132–142–15

2

–222–232–24

2

11 10 9 2 1 0

12

1121029

2

22212

0

Multiplier-Accumulators

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03/29/2000–LDS.10/2009-L

DEVICES INCORPORATED

LMA 1009/2009

12 x 12-bit Multiplier-Accumulator

MAXIMUM RATINGS

Storage temperature ........................................................................................................... –65°C to +150°C

Operating ambient temperature........................................................................................... –55°C to +125°C

VCC supply voltage with respect to ground............................................................................ –0.5 V to +7.0V

Input signal with respect to ground ........................................................................................ –3.0 V to +7.0 V

Signal applied to high impedance output ............................................................................... –3.0 V to +7.0 V

Output current into low outputs............................................................................................................. 25 mA

Latchup current ............................................................................................................................... > 400 mA

OPERATING CONDITIONS

Active Operation, Commercial 0°C to +70°C 4.75 V ≤ VCC ≤ 5.25 V
Active Operation, Military –55°C to +125°C 4.50 V ≤ VCC ≤ 5.50V

ELECTRICAL CHARACTERISTICS

Above which useful life may be impaired (Notes 1, 2, 3, 8)

To meet specified electrical and switching characteristics

Mode Temperature Range (Ambient) Supply Voltage

Over Operating Conditions (Note 4)

Symbol Parameter Test Condition Min Typ Max Unit

VOH Output High Voltage VCC = Min., IOH = –2.0 mA 2.4 V
VOL Output Low Voltage VCC = Min., IOL = 8.0 mA 0.5 V
VIH Input High Voltage 2.0 VCC V
VIL Input Low Voltage (Note 3) 0.0 0.8 V
IIX Input Current Ground ≤ VIN ≤ VCC (Note 12) ±20 µA
IOZ Output Leakage Current Ground ≤ VOUT ≤ VCC (Note 12) ±20 µA
ICC1 VCC Current, Dynamic (Notes 5, 6) 12 25 mA
ICC2 VCC Current, Quiescent (Note 7) 1.0 mA

Multiplier-Accumulators

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