UT54ACS374 Datasheet, PDF (1/6 Pages) List of Unclassifed Manufacturers – Radiation-Hardened Octal D-Type Flip-Flops with Three-State Outputs

UT54ACS374/UT54ACTS374
Radiation-Hardened
Octal D-Type Flip-Flops 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 UT54ACS374 and the UT54ACTS374 are non-inverting
octal D type flip-flops with three-state outputs designed for driv-
ing highly capacitive or relatively low-impedance loads. The
device is suitable for buffer registers, I/O ports, and bidirectional
bus drivers.
The eight flip-flops are edge triggered D-type flip-flops. On the
positive transition of the clock the Q outputs will follow the data
(D) inputs.
An output-control input (OC) places the eight outputs in either
a normal logic state (high or low logic level) or a high-imped-
ance state. The high-impedance third state and increased drive
provide the capability to drive the bus line in a bus-organized
system without the need for interface or pull-up components.
The output control OC does not affect the internal operations of
the flip-flops. 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
INPUTS
OUTPUT
OC
CLK
nD
nQ
L
H
H
L
L
L
L
L
X
nQ₀
H
X
X
Z
PINOUTS
20-Pin DIP
Top View
OC 1 20
1Q 2 19
1D 3 18
2D 4 17
2Q 5 16
3Q 6 15
3D 7 14
4D 8 13
4Q 9 12
V_SS 10 11
V_DD
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
20-Lead Flatpack
Top View
OC
1Q
1D
2D
2Q
3Q
3D
4D
4Q
V_SS
LOGIC SYMBOL
(1)
OC
EN
(11)
CLK
C1
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
V_DD
8Q
8D
7D
7Q
6Q
6D
5D
5Q
CLK
1D ⁽³⁾
1D
2D ⁽⁴⁾
3D ⁽⁷⁾
4D ⁽⁸⁾
5D ⁽¹³⁾
6D ⁽¹⁴⁾
7D ⁽¹⁷⁾
8D ⁽¹⁸⁾
(2)
(5)
1Q
2Q
(6) _3Q
(9) _4Q
(12) _5Q
(15) _6Q
(16) _7Q
(19) _8Q
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and IEC
Publication 617-12.
223
RadHard MSI Logic