Standard Products
UT54ACS165/UT54ACTS165
8-Bit Parallel Shift Registers
Datasheet
November 2010
www.aeroflex.com/logic
FEATURES
PINOUTS
Complementary outputs
Direct overriding load (data) inputs
Gated clock inputs
16-Pin DIP
Top View
Parallel-to-serial data conversions
1.2μ CMOS
- Latchup immune
High speed
Low power consumption
Single 5 volt supply
Available QML Q or V processes
Flexible package
VDD
16
1
SH/LD
CLK INH
15
14
13
12
11
10
9
2
3
4
5
6
7
8
CLK
E
D
C
F
B
G
A
H
SER
QH
QH
VSS
- 16-pin DIP
- 16-lead flatpack
UT54ACS165 - SMD 5962-96558
UT54ACTS165 - SMD 5962-96559
16-Lead Flatpack
Top View
DESCRIPTION
1
16
VDD
SH/LD
CLK
2
15
14
13
12
11
10
9
CLK INH
The UT54ACS165 and the UT54ACTS165 are 8-bit serial shift regis-
ters that, when clocked, shift the data toward serial output QH. Parallel-
3
4
5
6
7
8
D
E
F
C
in access to each stage is provided by eight individual data inputs that
are enabled by a low level at the SH/LD input. The devices feature a
clock inhibit function and a complemented serial output QH .
B
G
A
H
QH
VSS
SER
QH
Clocking is accomplished by a low-to-high transition of the CLK input
while SH/LD is held high and CLK INH is held low. The functions of
theCLKandCLKINH(clockinhibit)inputsareinterchangeable. Since
a low CLK input and a low-to-high transition of CLK INH will also
accomplish clocking, CLK INH should be changed to the high level
only while the CLK input is high. Parallel loading is disabled when
SH/LD is held high. Parallel inputs to the registers are enabled while
SH/LD is low independently of the levels of CLK, CLK INH or SER
inputs.
LOGIC SYMBOL
SRG8
(1)
SH/LD
C1 (LOAD)
(15)
CLK INH
≥1
The devices are characterized over full military temperature range of
-55°C to +125°C.
C2/
(2)
CLK
(10)
FUNCTION TABLE
SER
A
2D
1D
(11)
INPUTS
INTERNAL OUTPUTS
OUTPUTS
(12)
B
1D
(13)
C
SH/ CLK CLK SER PARALLEL
(14)
D
QA
QB
QH QH
LD
A . . . H
INH
X
(3)
E
h
L
X
L
↑
X
X
a . . . h
X
a
b
h
(4)
F
(5)
H
L
Q
Q
Q
Q
Q
Q
Q
A
B
A
A
B
H
G
G
H
H
G
G
H
G
(9)
(7)
QH
QH
(6)
H
H
H
H
L
L
H
H
L
X
X
X
H
Q
Q
Q
Q
Q
Q
1D
↑
L
Note:
1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
X
X
Q
A
Note:
1
1. Qn = The state of the referenced output one setup time prior to the Low-to-
High clock transition.PINOUTS