LOGIC LMA2010JC35, LMA2010JC25 Datasheet
DEVICES INCORPORATED
LMA1010/2010
16 x 16-bit Multiplier-Accumulator
LMA1010/2010
DEVICES INCORPORATED
16 x 16-bit Multiplier-Accumulator
FEATURES DESCRIPTION
❑❑
❑ 20 ns Multiply-Accumulate Time
❑❑
❑❑
❑ Replaces Fairchild TMC2210,
❑❑
Cypress CY7C510, IDT 7210L,
and AMD Am29510
❑❑
❑ Two’s Complement or Unsigned
❑❑
Operands
❑❑
❑ Accumulator Performs Preload,
❑❑
Accumulate, and Subtract
❑❑
❑ Three-State Outputs
❑❑
❑❑
❑ 68-pin PLCC, J-Lead
❑❑
The LMA1010 and LMA2010 are
high-speed, low power 16-bit
multiplier-accumulators. The LMA1010
and LMA2010 are functionally identical;
they differ only in packaging. Full military ambient temperature range operation is achieved with advanced CMOS
technology.
The LMA1010 and LMA2010 produce
the 32-bit product of two 16-bit numbers.
The results of a series of multiplications
may be accumulated to form the sum of
products. Accumulation is performed to
35-bit precision with the multiplier product sign extended as appropriate.
Data present at the A and B input registers is latched on the rising edges of
CLK A and CLK B respectively. RND,
LMA1010/2010 BLOCK DIAGRAM
15-0
A
16
CLK A
CLK B
A REGISTER B REGISTER
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 16 least
significant bits produces a result
correctly rounded to 16-bit precision.
ACC and SUB 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
B
15-0
R
15-0
16
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.
RND
TC
ACC
SUB
OEX
OEM
OEL
PREL
CLK R ACCUMULATOR
PRELOAD
CONTROL
LOGIC
REGISTER
3
3
OEX
OEM
OEL
LEX
LEM
LEL
35
LEM LELLEX
3 16 16
OEX
3
R
34-32
R
R + A
R – A
PASS R
16
R
31-16
32
OEM
A
35
REGISTER
1
16
OEL
The LMA1010/2010 output register
(accumulator register) is divided into
three independently controlled sections. The least significant result
(LSR) and most significant result
(MSR) registers are 16 bits in length.
The extended result register (XTR) is
3 bits long. The output signals R15-0
and input signals B15-0 share the same
bidirectional pins.
Each output register has an independent output enable control. In addition
to providing three-state control of the
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
08/16/2000–LDS.10/2010-P
DEVICES INCORPORATED
LMA1010/2010
16 x 16-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 L LZZZ
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)
15 14 13 2 1 0
0
–2
(Sign)
15 14 13 2 1 0
15
–2
(Sign)
15 14 13 2 1 0
–12–22–3
2
15 14 13 2 1 0
15214213
2
2–12
2142
–2
–132–142–15
2
Integer Two’s Complement (TC = 1)
13
22212
Unsigned Fractional (TC = 0)
–142–152–16
2
Unsigned Integer (TC = 0)
22212
B
IN
15 14 13 2 1 0
–2
(Sign)
0
2–12
–2
–132–142–15
2
15 14 13 2 1 0
0
15
–2
(Sign)
2142
13
22212
0
15 14 13 2 1 0
–12–22–3
2
–142–152–16
2
15 14 13 2 1 0
0
15214213
2
22212
0
FIGURE 1B.OUTPUT FORMATS
XTR
34 33 32
4
–2
(Sign)
34 33 32
34
–2
(Sign)
34 33 32
22120
2
34 33 32
34233232
2
232
2332
2
32
MSR LSR
Fractional Two’s Complement
31 30 29 18 17 16
1202–1
2
–122–132–14
2
Integer Two’s Complement
31 30 29 18 17 16
31230229
2
2182172
Unsigned Fractional
31 30 29 18 17 16
–12–22–3
2
–142–152–16
2
Unsigned Integer
31 30 29 18 17 16
31230229
2
2182172
15 14 13 2 1 0
–152–162–17
2
–282–292–30
2
15 14 13 2 1 0
16
15214213
2
22212
0
15 14 13 2 1 0
–172–182–19
2
–302–312–32
2
15 14 13 2 1 0
16
15214213
2
22212
0
Multiplier-Accumulators
2
08/16/2000–LDS.10/2010-P
DEVICES INCORPORATED
LMA1010/2010
16 x 16-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 ≤ 5.25V
Active Operation, Military –55°C to +125°C 4.50 V ≤ VCC ≤ 5.50 V
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
3
08/16/2000–LDS.10/2010-P
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