Aeroflex UTMC UT54ACTS373, UT54ACS373 Datasheet
217 RadHard MSI Logic
UT54ACS373/UT54ACTS373
Radiation-Hardened
Octal Transparent Latches with Three-State Outputs
FEATURES
8 latches in a single package
Three-state bus-driving true outputs
Full parallel access for loading
radiation-hardened CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
- 20-pin DIP
- 20-lead flatpack
DESCRIPTION
The UT54ACS373 and the UT54ACTS373 are 8-bit latches
with three-state outputs designed for driving highly capacitive
or relatively low-impedance loads. The device is suitable for
buffer registers, I/O ports, and bidirectional bus drivers.
The eight latches are transparent D latches. While the enable
(C) is high the Q outputs will follow the data (D) inputs. When
the enable is taken low, the Q outputs will be latched at the levels
that were set up at the D inputs.
An output-control input (OC) places the eight outputs in either
a normal logic state (high or low logic levels) or a high-impedance state. The high-impedance third state and increased drive
provide the capability to drive the bus line in a bus-organized
system without need for interface or pull-up components.
The output control OC does not affect the internal operations of
the latches. Old data can be retained or new data can be entered
while the outputs are off.
The devices are characterized over full military temperature
range of -55 C to +125 C.
FUNCTION TABLE
Note:
1. Data may be latched internally.
PINOUTS
20-Pin DIP
Top View
20-Lead Flatpack
Top View
LOGIC SYMBOL
INPUTS OUTPUT
OC C nD nQ
L H H H
L H L L
L L X nQ
0
H X X
Z
1
1
2
3
4
5
7
6
20
19
18
17
16
14
15
OC
1Q
1D
2D
2Q
3Q
3D
V
DD
8Q
8D
7D
7Q
6D
8 134D 5D
6Q
9 124Q 5Q
10 11V
SS
C
1
2
3
4
5
7
6
20
19
18
17
16
14
15
OC
1Q
1D
2D
2Q
3Q
3D
V
DD
8Q
8D
7D
7Q
6D
8 134D 5D
6Q
9 124Q 5Q
10 11V
SS
C
(1)
OC EN
(3)
1D
(4)
2D
(7)
(2)
1Q
(6)
(5)
2Q
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
3D
(8)
4D
(13)
5D
(14)
6D
3Q
(15)
6Q
(12)
5Q
(9)
4Q
(17)
7D
(18)
8D
(19)
8Q
(16)
7Q
(11)
C C1
1D
RadHard MSI Logic 218
UT54ACS373/UT54ACTS373
LOGIC DIAGRAM
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 RATING
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.
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
OC
C
1D2D3D4D5D6D7D8D
(1)
(11)
(4)(7)(8)
(13)(14)(17)(18)
(2)(5)(6)(9)(12)(15)(16)(19)
1Q2Q3Q4Q5Q6Q7Q8Q
CD
CDCD
CD
C
D
CD
(3)
D CCD
Q
Q
Q
Q
Q
Q
Q Q
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
219 RadHard MSI Logic
UT54ACS373/UT54ACTS373
RECOMMENDED OPERATING CONDITIONS
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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