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71 RadHard MSI Logic
UT54ACS138/UT54ACTS138
Radiation-Hardened
3-Line to 8-Line Decoders/Demultiplexers
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 UT54ACS138 and the UT54ACTS138 3-line to 8-line decoders/demultiplexers are designed to be used in high-performance memory-decoding or data-routing applications requiring
very short propagation delay times.
The conditions at the binary select inputs and the three enable
inputs select one of eight output lines. Two active-low and one
active-high enable inputs reduce the need for external gates of
inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only
one inverter. An enable input can be used as a data input for
demultiplexing applications.
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
FUNCTION TABLE
1
2
3
4
5
7
6
16
15
14
13
12
10
11
A
B
C
G2A
G2B
G1
Y7
V
DD
Y0
Y1
Y2
Y3
Y4
Y5
8 9V
SS
Y6
1
2
3
4
5
7
6
16
15
14
13
12
10
11
V
DD
A
B
C
G2A
G2B
G1
Y7
Y0
Y1
Y2
Y3
Y4
Y5
V
SS
Y6
8 9
ENABLE INPUTS SELECT INPUTS OUTPUT
G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X X H X X X H H H H H H H H
L X X X X X H H H H H H H H
X H X X X X H H H H H H H H
H L L L L L L H H H H H H H
H L L L L H H L H H H H H H
H L L L H L H H L H H H H H
H L L L H H H H H L H H H H
H L L H L L H H H H L H H H
H L L H L H H H H H H L H H
H L L H H L H H H H H H L H
H L L H H H H H H H H H H L
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RadHard MSI Logic 72
UT54ACS138/UT54ACTS138
LOGIC SYMBOL
LOGIC DIAGRAM
(7)
Y7
(1)
A
(2)
B
(3)
C
(6)
G1
(4)
G2A
(5)
G2B
2
4
1
(9)
Y6
(10)
Y5
(11)
Y4
(12)
Y3
(13)
Y2
(14)
Y1
(15)
Y0
BIN/OCT
EN
&
1
2
0
4
5
3
6
7
(7)
Y7
(1)
A
(2)
B
(3)
C
(6)
G1
(4)
G2A
(5)
G2B
2
4
1
(9)
Y6
(10)
Y5
(11)
Y4
(12)
Y3
(13)
Y2
(14)
Y1
(15)
Y0
DMUX
EN
&
1
2
0
4
5
3
6
7
Note:
1. Logic symbols in accordance with ANSI/IEEE standard 91-1984 and IEC Publication 617-12.
G
0
7
---
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
DATA
SELECT
ENABLE
(15)
(14)
(13)
(12)
(11)
(10)
(9)
(7)
(3)
(2)
(1)
A
B
C
(6)
(4)
(5)
G1
G2A
G2B
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73 RadHard MSI Logic
UT54ACS138/UT54ACTS138
RADIATION HARDNESS SPECIFICATIONS
1
Notes:
1. Logic will not latchup during radiation exposure within the limits defined in the table.
2. Device storage elements are immune to SEU affects.
ABSOLUTE MAXIMUM RATINGS
Note:
1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, functional operation of the device
at these or any other conditions beyond limits indicated in the operational sections is not recommended. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
RECOMMENDED OPERATING CONDITIONS
PARAMETER LIMIT UNITS
Total Dose 1.0E6 rads(Si)
SEU Threshold
2
80
MeV-cm2/mg
SEL Threshold 120
MeV-cm2/mg
Neutron Fluence 1.0E14
n/cm
2
SYMBOL PARAMETER LIMIT UNITS
V
DD
Supply voltage -0.3 to 7.0 V
V
I/O
Voltage any pin -.3 to VDD +.3 V
T
STG
Storage Temperature range -65 to +150 C
T
J
Maximum junction temperature +175 C
T
LS
Lead temperature (soldering 5 seconds) +300 C
JC
Thermal resistance junction to case 20 C/W
I
I
DC input current 10 mA
P
D
Maximum power dissipation 1 W
SYMBOL PARAMETER LIMIT UNITS
V
DD
Supply voltage 4.5 to 5.5 V
V
IN
Input voltage any pin 0 to V
DD
V
T
C
Temperature range -55 to + 125 C
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RadHard MSI Logic 74
UT54ACS138/UT54ACTS138
DC ELECTRICAL CHARACTERISTICS
7
(VDD = 5.0V 10%; VSS = 0V 6, -55 C < TC < +125 C)
SYMBOL PARAMETER CONDITION MIN MAX UNIT
V
IL
Low-level input voltage
1
ACTS
ACS
0.8
.3V
DD
V
V
IH
High-level input voltage
1
ACTS
ACS
.5V
DD
.7V
DD
V
I
IN
Input leakage current
ACTS/ACS VIN = V
DD
or V
SS
-1
1 A
V
OL
Low-level output voltage
3
ACTS
ACS
I
OL
= 8.0mA
I
OL
= 100 A
0.40
0.25
V
V
OH
High-level output voltage
3
ACTS
ACS
I
OH
= -8.0mA
I
OH
= -100 A
.7V
DD
VDD - 0.25
V
I
OS
Short-circuit output current
2 ,4
ACTS/ACS
VO = VDD and V
SS
-200 200 mA
I
OL Output current
10
(Sink)
VIN = VDD or V
SS
VOL = 0.4V
8 mA
I
OH
Output current
10
(Source)
VIN = VDD or V
SS
VOH = VDD - 0.4V
-8 mA
P
total
Power dissipation
2, 8, 9
CL = 50pF 1.9 mW/
MHz
I
DDQ
Quiescent Supply Current VDD = 5.5V 10 A
I
DDQ
Quiescent Supply Current Delta
ACTS
For input under test
VIN = VDD - 2.1V
For all other inputs
VIN = VDD or V
SS
V
DD
= 5.5V
1.6 mA
C
IN Input capacitance
5
= 1MHz @ 0V 15 pF
C
OUT Output capacitance
5
= 1MHz @ 0V 15 pF
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75 RadHard MSI Logic
UT54ACS138/UT54ACTS138
Notes:
1. Functional tests are conducted in accordance with MIL-STD-883 with the following input test conditions: VIH = VIH(min) + 20%, - 0%; VIL = VIL(max) + 0%,
- 50%, as specified herein, for TTL, CMOS, or Schmitt compatible inputs. Devices may be tested using any input voltage within the above specified range, but
are guaranteed to VIH(min) and VIL(max).
2. Supplied as a design limit but not guaranteed or tested.
3. Per MIL-PRF-38535, for current density 5.0E5 amps/cm2, the maximum product of load capacitance (per output buffer) times frequency should not exceed
3,765 pF/MHz.
4. Not more than one output may be shorted at a time for maximum duration of one second.
5. Capacitance measured for initial qualification and when design changes may affect the value. Capacitance is measured between the designated terminal and VSS
at frequency of 1MHz and a signal amplitude of 50mV rms maximum.
6. Maximum allowable relative shift equals 50mV.
7. All specifications valid for radiation dose 1E6 rads(Si).
8. Power does not include power contribution of any TTL output sink current.
9. Power dissipation specified per switching output.
10. This value is guaranteed based on characterization data, but not tested.
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RadHard MSI Logic 76
UT54ACS138/UT54ACTS138
AC ELECTRICAL CHARACTERISTICS
2
(VDD = 5.0V 10%; VSS = 0V 1, -55 C < TC < +125 C)
Notes:
1. Maximum allowable relative shift equals 50mV.
2. All specifications valid for radiation dose 1E6 rads(Si).
SYMBOL PARAMETER MINIMUM MAXIMUM UNIT
t
PHL
Binary Select to output Yn 2 15 ns
t
PLH
Binary Select to output Yn 2 15 ns
t
PHL
Enable to output Yn 2 17 ns
t
PLH
Enable to output Yn 2 14 ns
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