Aeroflex UTMC UT54ACTS85, UT54ACS85 Datasheet
51 RadHard MSI Logic
UT54ACS85/UT54ACTS85
Radiation-Hardened
4-Bit Comparators
FEATURES
radiation-hardened CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 16-pin DIP
- 16-lead flatpack
DESCRIPTION
The UT54ACS85 and the UT54ACTS85 are 4-bit magnitude
comparators that perform comparison of straight binary and
straight BCD (8-4-2-1) codes. Three fully decoded decisions
about two 4-bit words (A, B) are made and are externally available at three outputs. Devices are fully expandable to any number of bits without external gates. The cascading paths of the
devices are implemented with only a two-gate-level delay to
reduce overall comparison times for long words. An alternate
method of cascading which further reduces the comparison time
is shown in the typical application data.
The devices are characterized over full military temperature
range of -55 C to +125 C.
LOGIC SYMBOL
PINOUTS
16-Pin DIP
Top View
16-Lead Flatpack
Top View
(5)
(A>B)OUT
(10)
A0
(12)
A1
(13)
A2
0
(6)
(A=B)OUT
(7)
(A<B)OUT
COMP
<
=
>
A
(15)
A3
(2)
(A<B)IN
(3)
(A=B)IN
(4)
(A>B)IN
(9)
B0
(11)
B1
(14)
B2
(1)
B3
3
<
=
>
0
B
3
Note:
1. Logic symbol in accordance with ANSI/IEEE standard 91-1984 and IEC
Publication 617-12.
1
2
3
4
5
7
6
16
15
14
13
12
10
11
B3
(A<B)IN
(A=B)IN
(A>B)IN
(A>B)OUT
(A=B)OUT
(A<B)OUT
V
DD
A3
B2
A2
A1
B1
A0
8 9
V
SS
B0
1
2
3
4
5
7
6
16
15
14
13
12
10
11
V
DD
B3
(A<B)IN
(A=B)IN
(A>B)IN
(A>B)OUT
(A=B)OUT
(A<B)OUT
A3
B2
A2
A1
B1
A0
V
SS
B08 9
RadHard MSI Logic 52
UT54ACS85/UT54ACTS85
FUNCTION TABLE
LOGIC DIAGRAM
COMPARING INPUTS CASCADING INPUTS OUTPUTS
A3, B3 A2, B2 A1, B1 A0, B0 A>B A<B A=B A>B A<B A=B
A3>B3 X X X X X X H L L
A3<B3 X X X X X X L H L
A3=B3 A2>B2 X X X X X H L L
A3=B3 A2<B2 X X X X X L H L
A3=B3 A2=B2 A1>B1 X X X X H L L
A3=B3 A2=B2 A1<B1 X X X X L H L
A3=B3 A2=B2 A1=B1 A0>B0 X X X H L L
A3=B3 A2=B2 A1=B1 A0<B0 X X X L H L
A3=B3 A2=B2 A1=B1 A0=B0 H L L H L L
A3=B3 A2=B2 A1=B1 A0=B0 L H L L H L
A3=B3 A2=B2 A1=B1 A0=B0 X X H L L H
A3=B3 A2=B2 A1=B1 A0=B0 H H L L L L
A3=B3 A2=B2 A1=B1 A0=B0 L L L H H L
(7)
A>B
A=B
A<B
A3
B3
A2
B2
A<B
A=B
A>B
A1
B1
A0
B0
(6)
(5)
(15)
(1)
(13)
(14)
(2)
(3)
(4)
(12)
(11)
(10)
(9)
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