Aeroflex UTMC UT54ACTS264, UT54ACS264 Datasheet
183 RadHard MSI Logic
UT54ACS264/UT54ACTS264
Radiation-Hardened
Look-Ahead Carry Generators for Counters
FEATURES
Performs look-ahead carry across n-bit counters
Accommodates active-high or active-low carry
Improves cascaded counters system performance
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 UT54ACS264 and the UT54ACTS264 are look-ahead genÂerators designed specifically to perform a carry-anticipate
across any number of n-bit counters, thus increasing system
clock frequency. A carry enable CE, and carry outputs RCOA
and RCOB are provided for n-bit cascading.
Use the counter with either active-high-carry or active-low-carÂry counters. For active-high-carry counters, CE is active high,
the A set of inputs and output RCOA are used. The B set of
inputs are connected to a low logic level. For active-low-carry
counters, CE is active low, the B set of inputs and output RCOB
are used. The A set of inputs are connected to a high logic level.
The devices are characterized over full military temperature
range of -55 C to +125 C.
PINOUTS
16-Pin DIP
Top View
16-Lead Flatpack
Top View
1
2
3
4
5
7
6
16
15
14
13
12
10
11
A1
B1
A0
B0
A3
B3
RCOB
V
DD
B2
A2
CE
C0
C1
RCOA
8 9
V
SS
C2
1
2
3
4
5
7
6
16
15
14
13
12
10
11
V
DD
A1
B1
A0
B0
A3
B3
RCOB
B2
A2
CE
C0
C1
RCOA
V
SS
C2
8 9
RadHard MSI Logic 184
UT54ACS264/UT54ACTS264
LOGIC SYMBOL
Notes:
1. Logic symbols in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
FUNCTION TABLE FOR C0 OUTPUT
FUNCTION TABLE FOR C1 OUTPUT
FUNCTION TABLE FOR RCOB OUTPUT
FUNCTION TABLE FOR C2 OUTPUT
FUNCTION TABLE FOR RCOA OUTPUT
(12)
C0
(11)
C1
(9)
C2
(10)
RCOA
(7)
RCOB
1
1
1
1
1
1,3
2,3
1,3,5
2,3,5
4,5
1,3,5,7
2,3,5,7
4,5,7
6,7
1,3,5,7,
4,5,7,9
6,7,9
8,9
1
2
4
6
8
(13)
CE
(4)
B0
(3)
A0
(2)
B1
(1)
A1
(15)
B2
(14)
A2
(6)
B3
(5)
A3
G9
Z8
G7
Z6
G5
Z4
G3
Z2
Z1
ACTIVE-HIGH INPUTS
(12)
C0
(11)
C1
(9)
C2
(10)
RCOA
(7)
RCOB
1
1
1
1
1,2
3
5
3,4
1,2,4
7
5,6
3,4,6
1,2,4,6
9
7,8
5,6,8
3,4,6,8
1,2,4,6,8
(13)
CE
(4)
B0
(3)
A0
(2)
B1
(1)
A1
(15)
B2
(14)
A2
(6)
B3
(5)
A3
Z9
G8
Z7
G6
Z5
G4
Z3
G2
Z1
ACTIVE-LOW INPUTS
1,4,6,8
INPUTS OUTPUT
A0 B0 CE C0
H H X H
H X H H
L X X L
X L L L
INPUTS OUTPUT
A1 A0 B1 B0 CE C1
H X H X X H
H H X H X H
H H X X H H
L X X X X L
X L L X X L
X X L L L L
INPUTS OUTPUT
B3 B2 B1 B0 CE RCOB
H X X X X H
X H X X X H
X X H X X H
X X X H X H
X X X X H H
L L L L L L
INPUTS OUTPUT
A2 A1 A0 B2 B1 B0 CE C2
H X X H X X X H
H H X X H X X H
H H H X X H X H
H H H X X X H H
L X X X X X X L
X L X L X X X L
X X L L L X X L
X X X L L L L L
INPUTS OUTPUT
A3 A2 A1 A0 B3 B2 B1 CE RCOA
H X X X H X X X H
H H X X X H X X H
H H H X X X H X H
H H H H X X X H H
L X X X X X X X L
X L X X L X X X L
X X L X L L X X L
X X X L L L L X L
X X X X L L L L L
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