Datasheet > LMA1009

LMA1009

更新时间： 2024-09-23 22:31:11

品牌	Logo	应用领域
逻辑 - LOGIC		/
页数	文件大小	规格书
7页	191K
描述
12 x 12-bit Multiplier-Accumulator

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LMA1009 数据手册

LMA 1009/2009

DEVICES INCORPORATED

12 x 12-bit Multiplier-Accumulator

LMA1009/2009

12 x 12-bit Multiplier-Accumulator

DEVICES INCORPORATED

FEATURES

DESCRIPTION

The LMA1009 and LMA2009 are high- Data present at the A and B input regis-

speed, low power 12-bit multiplier-accu- ters is latched on the rising edges of

mulators. They are pin-for-pin equiva- CLK A and CLK B respectively. RND,

lent to the TRW TDC1009/TMC2009 TC, ACC, and SUB controls are latched

multiplier-accumulators. The LMA1009 on the rising edge of the logical OR of

and LMA2009 are functionally identical; CLK AandCLK B. TCspecifiestheinput

they differ only in packaging. Full ambi- as two’s complement

❑ 20 ns Multiply-Accumulate Time

❑ LowPowerCMOSTechnology

❑ Replaces Fairchild TDC1009/

TMC2009

❑ Two’s Complement or Unsigned

Operands

❑ Accumulator Performs Preload,

ent temperature range operation is (TC HIGH) or unsigned magnitude

achieved by the use of advanced CMOS (TC LOW). RND, when HIGH, adds ‘1’

Accumulate, and Subtract

❑ Three-State Outputs

❑ 68-pinPLCC, J-Lead

technology.

to the most significant bit position of the

least significant half of the product. Sub-

sequent truncation of the 12 least signifi-

cant bits produces a result correctly

rounded to 12-bit precision.

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 prod-

ucts. Accumulation is performed to The ACC and SUB inputs control accu-

27-bitprecisionwiththemultiplierprod- mulatoroperation. ACCHIGHresultsin

uct sign extended as appropriate.

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 accu-

mulator 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

intotheaccumulatorregister. ACCLOW

and SUB HIGH is undefined.

LMA1009/2009 BLOCK DIAGRAM

11-0

B11-0

A REGISTER

B REGISTER

CLK A

CLK B

RND

ACC

SUB

The LMA1009/2009 output register (ac-

cumulator 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 regis-

ter (XTR) is 3 bits long.

R + A

R – A

OEX

LEX

LEM

LEL

PASS R

PRELOAD

CONTROL

LOGIC

OEM

OEL

PREL

Each output register has an independ-

ent output enable control. In addition

to providing control of the three-state

output buffers, when OEX, OEM, or

OELareHIGHandPRELisHIGH, 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.

OEX

OEM

OEL

LEX

LEM

LEL

CLK R

ACCUMULATOR REGISTER

OEX

OEM

OEL

26-24

23-12

R11-0

Multiplier-Accumulators

03/29/2000–LDS.10/2009-L

12 3 4 5 6 7

中文翻译

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与LMA1009相关器件

型号	品牌	获取价格	描述	数据表
LMA1009DC45	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DC55	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DC75	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DM55	ETC	获取价格	Multiplier/Accumulator
LMA1009DM65	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DM95	ETC	获取价格	Multiplier/Accumulator
LMA1009DMB55	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DMB65	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64
LMA1009DMB75	LOGIC	获取价格	Multiplier Accumulator/Summer, CMOS, CDIP64
LMA1009DMB95	LOGIC	获取价格	Multiplier Accumulator/Summer, 12-Bit, CMOS, CDIP64, SIDE BRAZED, HERMETIC SEALED, DIP-64

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