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SCAS144 − OCTOBER 1990 − REVISED APRIL 1993
DW OR N PACKAGE
(TOP VIEW)
• Inputs Are TTL-Voltage Compatible
• AND-Gated (Enable/Disable) Serial Inputs
• Fully Buffered Clock and Serial Inputs
• Direct Clear
Q
Q
Q
Q
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
C
D
B
A
Q
CLR
A
E
• Fully Synchronous Data Transfers
GND
GND
GND
GND
• Flow-Through Architecture Optimizes
V
CC
PCB Layout
V
CC
• Center-Pin V
and GND Pin Configurations
Minimize High-Speed Switching Noise
CC
B
Q
CLK
F
Q
G
Q
• EPIC (Enhanced-Performance Implanted
J
CMOS) 1-µm Process
Q
Q
I
H
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic
Small-Outline Packages and Standard
Plastic 300-mil DIPs
description
The 74ACT11898 features AND-gated serial inputs and an asynchronous clear. The gated serial inputs
(A and B) permit complete control over incoming data. A low at either input inhibits entry of new data and resets
the first flip-flop to the low level on the rising edge of the next clock pulse. A high-level input enables the other
input, which then determines the state of the first flip-flop. Data at the serial inputs may be changed while the
clock is high or low provided the minimum setup and hold time requirements are met. Clocking occurs on the
low-to-high transition of the clock input.
The 74ACT11898 is characterized for operation from −40°C to 85°C.
FUNCTION TABLE
INPUTS
OUTPUTS
...
CLR
L
CLK
A
X
X
H
L
B
X
X
H
X
L
Q
Q
Q
J
A
B
X
L
↑
↑
↑
L
L
L
H
Q
Q
Q
JO
A0
B0
AN
AN
AN
H
H
L
L
Q
Q
Q
Q
Q
Q
IN
IN
IN
H
H
X
H = high level (steady state)
X = irrelevant (any input, including transitions)
↑ = transition from low to high level
Q
, Q , Q = the level of Q , Q , Q respectively, before the
A0 B0 J0
A
B
J
indicated steady-state inputconditions were established.
Q , Q = the level or Q or Q before the most recent ↑ transition
n
in
A
J
of the clock; indicates aone-bit shift.t
EPIC is a trademark of Texas Instruments Incorporated.
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Copyright 1993, Texas Instruments Incorporated
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2−1
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