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SN54ALS29825, SN74ALS29825, SN74ALS29826
8 BIT BUS INTERFACE FLIP FLOPS WITH 3 STATE OUTPUTS
SDAS147B — JANUARY 1986 — REVISED MARCH 1990
•
•
•
•
•
•
•
Functionally Equivalent to AMD AM29825
and AM29826
Improved I
OH
Specifications
Multiple Output Enables Allow Multiuser
Control of the Interface
Outputs Have Undershoot Protection
Circuitry
Power-Up High-Impedance State
Package Options Include Plastic
“Small-Outline” Packages and Standard
Plastic and Ceramic 300-mil DIPs
Buffered Control Inputs to Reduce DC
Loading Effect
SN54ALS29825 . . . JT PACKAGE
SN74ALS29825 . . . DW OR NT PACKAGE
(TOP VIEW)
OC1
OC2
1D
2D
3D
4D
5D
6D
7D
8D
CLR
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
OC3
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
CLKEN
CLK
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.
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.
SN74ALS29826 . . . DW OR NT PACKAGE
(TOP VIEW)
OC1
OC2
1D
2D
3D
4D
5D
6D
7D
8D
CLR
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCC
OC3
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
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.
PRODUCTION DATA information is current as of
publication date. Products conform to specifications
per the terms of Texas Instruments standard
warranty. Production processing does not
necessarily include testing of all parameters.
POST OFFICE BOX 655303
Copyright
1991, Texas Instruments Incorporated
•
DALLAS, TEXAS 75265
1
SN54ALS29825, SN74ALS29825
8 BIT BUS INTERFACE FLIP FLOPS WITH 3 STATE OUTPUTS
SDAS147B — JANUARY 1986 — REVISED MARCH 1990
FUNCTION TABLE
INPUTS
OC *
L
L
L
L
H
CLR
L
H
H
H
X
CLKEN
X
L
L
H
X
CLK
X
↑
↑
X
X
D
X
H
L
X
X
OUTPUT
Q
L
H
L
Q0
Z
OC * = H if any of OC1, OC2, or OC3 is high.
OC * = L if any of OC1, OC2, or OC3 is low.
logic symbol
†
OC1
OC2
OC3
CLR
CLKEN
CLK
1D
2D
3D
4D
5D
6D
7D
8D
1
2
23
11
14
13
R
G1
1C2
2D
22
21
20
19
18
17
16
15
&
EN
logic diagram (positive logic)
MISSING ILLUSTRATION
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
3
4
5
6
7
8
9
10
† This symbol is in accordance with ANSI/IEEE Std. 91-1984
and IEC Publication 617-12.
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN74ALS29826
8 BIT BUS INTERFACE FLIP FLOPS WITH 3 STATE OUTPUTS
SDAS147B — JANUARY 1986 — REVISED MARCH 1990
FUNCTION TABLE
INPUTS
OC *
L
L
L
L
H
CLR
L
H
H
H
X
CLKEN
X
L
L
H
X
CLK
X
↑
↑
X
X
D
X
H
L
X
X
OUTPUT
Q
L
H
L
Q0
Z
OC * = H if any of OC1, OC2, or OC3 is high.
OC * = L if any of OC1, OC2, or OC3 is low.
logic symbol
†
OC1
OC2
OC3
CLR
CLKEN
CLK
1D
2D
3D
4D
5D
6D
7D
8D
1
2
23
11
14
13
R
G1
1C2
2D
22
21
20
19
18
17
16
15
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
&
EN
logic diagram (positive logic)
MISSING ILLUSTRATION
3
4
5
6
7
8
9
10
† This symbol is in accordance with ANSI/IEEE Std. 91-1984
and IEC Publication 617-12.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54ALS29825
8 BIT BUS INTERFACE FLIP FLOPS WITH 3 STATE OUTPUTS
SDAS147B — JANUARY 1986 — REVISED MARCH 1990
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to a disabled high-impedance output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 55°C to 125°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 65°C to 150°C
† Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and
functional operation of the device at these or any other conditions beyond those indicated in the “Recommended Operating Conditions” section
of this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to GND.
recommended operating conditions
MIN
VCC
VIH
VIL
IOH
IOL
tw
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
CLR low
Pulse duration
CLK high
CLK low
CLR inactive
tsu
Setup time before CLK
↑
Data
CLKEN high or low
th
TA
Hold time, data after CLK
↑
Operating free-air temperature
Data
CLKEN
7
8
8
7
4
8
4
2
25
7
8
8
7
4
8
4
2
− 55
125
ns
°C
ns
ns
NOM
5
MAX
MIN
4.75
2
0.8
− 18
32
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
VOL
IOZH
IOZL
II
IIH
IIL
IOS ¶
ICC
VCC = MIN,
VCC = MIN,
VCC = MIN,
VCC = MIN,
VCC = MAX,
VCC = MAX,
VCC = MAX,
VCC = MAX,
VCC = MAX,
VCC = MAX,
VCC = MAX,
TEST CONDITIONS ‡
II = −18 mA
IOH = −12 mA
IOH = −18 mA
IOL = 32 mA
VO = 2.4 V
VO = 0.4 V
VI = 5.5 V
VI = 2.7 V
VI = 0.4 V
VO = 0 V
Outputs open
−75
70
MIN
2.4
2
0.35
0.5
50
− 50
0.1
20
− 0.5
−250
115
TYP §
MAX
−1.2
UNIT
V
V
V
µA
µA
mA
µA
mA
mA
mA
‡ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
§ All typical values are at VCC = 5 V, TA = 25°C.
¶ Not more than one output should be shorted at a time and duration of the short circuit should not exceed one second.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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