LOGIC LMU8UPC50, LMU8UPC35, LMU8UJC50, LMU8UJC35, LMU08PC35 Datasheet
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DEVICES INCORPORATED
LMU08/8U
8 x 8-bit Parallel Multiplier
Multipliers
08/16/2000–LDS.08/8U-R
1
❑❑
❑❑
❑ 20 ns Worst-Case Multiply Time
❑❑
❑❑
❑ Low Power CMOS Technology
❑❑
❑❑
❑ LMU08 Replaces TRW TMC208K
❑❑
❑❑
❑ LMU8U Replaces TRW TMC28KU
❑❑
❑❑
❑ Two’s Complement (LMU08), or
Unsigned Operands (LMU8U)
❑❑
❑❑
❑ Three-State Outputs
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❑❑
❑ Package Styles Available:
• 40-pin PDIP
• 44-pin PLCC, J-Lead
FEATURES DESCRIPTION
LMU08/8U
8 x 8-bit Parallel Multiplier
DEVICES INCORPORATED
The LMU08 and LMU8U are high-
speed, low power 8-bit parallel
multipliers. They are pin-for-pin
equivalents with TRW TMC208K and
TMC28KU type multipliers. Full
military ambient temperature range
operation is attained by the use of
advanced CMOS technology.
Both the LMU08 and the LMU8U
produce the 16-bit product of two
8-bit numbers. The LMU08 accepts
operands in two’s complement format,
and produces a two’s complement
result. The product is provided in two
halves with the sign bit replicated as
the most significant bit of both halves.
This facilitates use of the LMU08
product as a double precision operand
in 8-bit systems. The LMU8U operates on unsigned data, producing an
unsigned magnitude result.
Both the LMU08 and the LMU8U
feature independently controlled
registers for both inputs and the
product, which along with three-state
outputs allows easy interfacing with
microprocessor busses. Provision is
made in the LMU08 and LMU8U for
proper rounding of the product to
8-bit precision. The round input is
loaded at the rising edge of the logical
OR of CLK A and CLK B for the
LMU08. The LMU8U latches RND on
the rising edge of CLK A only. In
either case, a ‘1’ is added in the most
significant position of the lower
product byte when RND is asserted.
Subsequent truncation of the least
significant product byte results in a
correctly rounded 8-bit result.
LMU08/8U BLOCK DIAGRAM
REGISTER
CLK A
CLK B
RND
CLK R
LMU08 Only
8
8
16
88
OEM
R
7-0
A
7-0
R
15-8
A REGISTER
B REGISTER
B
7-0
RESULT REGISTER
OEL
88
DEVICES INCORPORATED
LMU08/8U
8 x 8-bit Parallel Multiplier
Multipliers
08/16/2000–LDS.08/8U-R
2
FIGURE 1A.INPUT FORMATS
FIGURE 1B.OUTPUT FORMATS
15 14 13 10 9 8
–2
0
(Sign)
2–12
–2
2–52–62
–7
765 210
–2
0
(Sign)
2–82
–9
2
–122–132–14
LMU08 Fractional Two’s Complement
15 14 13 10 9 8
–2
14
(Sign)
2132
12
29282
7
765 210
–2
14
(Sign)
262
5
22212
0
LMU08 Integer Two’s Complement
15 14 13 10 9 8
2
–12–22–3
2–62–72
–8
765 210
2
–92–102–11
2
–142–152–16
LMU8U Unsigned Fractional
15 14 13 10 9 8
2
15214213
210292
8
765 210
2
72625
22212
0
LMU8U Unsigned Integer
MSP LSP
765 210
–2
0
(Sign)
2–12
–2
2–52–62
–7
765 210
–2
0
(Sign)
2–12
–2
2–52–62
–7
LMU08 Fractional Two’s Complement
765 210
–2
7
(Sign)
262
5
22212
0
765 210
–2
7
(Sign)
262
5
22212
0
LMU08 Integer Two’s Complement
765 210
2
–12–22–3
2–62–72
–8
765 210
2
–12–22–3
2–62–72
–8
LMU8U Unsigned Fractional
765 210
2
72625
22212
0
765 210
2
72625
22212
0
LMU8U Unsigned Integer
A
IN
B
IN
DEVICES INCORPORATED
LMU08/8U
8 x 8-bit Parallel Multiplier
Multipliers
08/16/2000–LDS.08/8U-R
3
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
MAXIMUM RATINGS
Above which useful life may be impaired (Notes 1, 2, 3, 8)
OPERATING CONDITIONS
To meet specified electrical and switching characteristics
ELECTRICAL CHARACTERISTICS
Over Operating Conditions (Note 4)
Mode Temperature Range (Ambient) Supply Voltage
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
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
V IL 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) 824mA
ICC2 VCC Current, Quiescent (Note 7) 1.0 mA
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