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ꢈ ꢍ ꢎꢏ ꢐ ꢊꢎꢑ ꢀꢊ ꢏꢁꢐ ꢒꢓꢔꢄꢕꢒ ꢊꢔ ꢅ ꢏꢖꢍ ꢔ ꢅ ꢗ ꢖꢀꢊ ꢘꢏ ꢐ ꢙꢊꢚ ꢍ ꢀ ꢐꢄꢐ ꢒꢊ ꢗꢑ ꢐꢖ ꢑꢐ ꢀ
SDAS147B — JANUARY 1986 — REVISED MARCH 1990
SN54ALS29825 . . . JT PACKAGE
SN74ALS29825 . . . DW OR NT PACKAGE
• Functionally Equivalent to AMD AM29825
and AM29826
(TOP VIEW)
• Improved I
Specifications
OH
1
24
23
22
21
20
19
18
17
16
15
14
13
OC1
OC2
1D
V
CC
OC3
• Multiple Output Enables Allow Multiuser
2
Control of the Interface
3
1Q
4
2D
2Q
• Outputs Have Undershoot Protection
5
3D
3Q
Circuitry
6
4D
4Q
7
5D
5Q
• Power-Up High-Impedance State
• Package Options Include Plastic
“Small-Outline” Packages and Standard
Plastic and Ceramic 300-mil DIPs
8
6D
6Q
9
7D
7Q
10
11
12
8D
8Q
CLR
GND
CLKEN
CLK
• Buffered Control Inputs to Reduce DC
Loading Effect
SN74ALS29826 . . . DW OR NT PACKAGE
(TOP VIEW)
description
These 8-bit flip-flops feature three-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing multiuser
registers, I/O ports, bidirectional bus drivers, and
working registers.
1
24
23
22
21
20
19
18
17
16
15
14
13
OC1
OC2
1D
V
CC
OC3
2
3
1Q
4
2D
2Q
5
3D
3Q
6
4D
4Q
7
5D
5Q
With the clock enable (CLKEN) low, the eight
D-type edge-triggered flip-flops enter data on the
low-to- high transitions of the clock. Taking
CLKEN high will disable the clock buffer, thus
latching the outputs. The ′ALS29825 has
noninverting D inputs and the ′ALS29826 has
inverting D inputs. Taking the CLR input low
causes the eight Q outputs to go low independent-
ly of the clock.
8
6D
6Q
9
7D
7Q
10
11
12
8D
8Q
CLR
GND
CLKEN
CLK
Multiuser buffered output-control inputs (OC1, OC2, and OC3) can be used to place the eight outputs in either
a normal logic state (high or low level) or a high-impedance state. The outputs are also in the high-impedance
state during power-up and power-down conditions. The outputs remain in the high-impedance state while the
device is powered-down. In the high-impedance state the outputs neither load nor drive the bus lines
significantly. The high-impedance state and increased drive provide the capability to drive the bus lines in a
bus-organized system without need for interface or pullup components. The output controls do not affect the
internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are
in the high-impedance state.
The SN54ALS29825 is characterized over the full military range of − 55°C to 125°C. The SN74ALS29825 and
SN74ALS29826 are characterized for operation from 0°C to 70°C.
ꢖꢓ ꢗ ꢛꢑ ꢕ ꢐꢏ ꢗꢁ ꢛ ꢄꢐꢄ ꢜꢝ ꢞ ꢟꢠ ꢡꢢ ꢣꢜꢟ ꢝ ꢜꢤ ꢥꢦ ꢠ ꢠ ꢧꢝꢣ ꢢꢤ ꢟꢞ
ꢣ
Copyright 1991, Texas Instruments Incorporated
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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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