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SN54AS823A, SN74AS823A, SN74AS824A
9-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS231A – JUNE 1984 – REVISED AUGUST 1995
•
•
•
•
•
•
Functionally Equivalent to AMD’s AM29823
and AM29824
Provide Extra Data Width Necessary for
Wider Address/Data Paths or Buses With
Parity
Outputs Have Undershoot-Protection
Circuitry
Power-Up High-Impedance State
Buffered Control Inputs to Reduce
dc Loading Effects
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
SN54AS823A . . . JT PACKAGE
SN74AS823A . . . DW OR NT PACKAGE
(TOP VIEW)
OE
1D
2D
3D
4D
5D
6D
7D
8D
9D
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
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
CLKEN
CLK
description
These 9-bit flip-flops feature 3-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. These devices
are particularly suitable for implementing wider
buffer registers, I/O ports, bidirectional bus
drivers, parity bus interfacing, and working
registers.
With the clock-enable (CLKEN) input low, the nine
D-type edge-triggered flip-flops enter data on the
low-to-high transitions of the clock (CLK) input.
Taking CLKEN high disables the clock buffer,
latching the outputs. The SN54AS823A and
SN74AS823A have noninverting data (D) inputs
and the SN74AS824A has inverting (D) inputs.
Taking the clear (CLR) input low causes the nine
Q outputs to go low independently of the clock.
A buffered output-enable (OE) input can be used
to place the nine outputs in either a normal logic
state (high or low logic level) or the high-
impedance state. 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 bus
lines without interface or pullup components.
OE does 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 SN54AS823A is characterized for operation
over the full military temperature range of – 55°C
to 125°C. The SN74AS823A and SN74AS824A
are characterized for operation from 0°C to 70°C.
SN54AS823A . . . FK PACKAGE
(TOP VIEW)
3D
4D
5D
NC
6D
7D
8D
2D
1D
OE
NC
V
CC
1Q
2Q
4
5
6
7
8
9
10
3 2 1 28 27 26
25
24
23
22
21
20
19
11
12 13 14 15 16 17 18
3Q
4Q
5Q
NC
6Q
7Q
8Q
SN74AS824A . . . DW OR NT PACKAGE
(TOP VIEW)
OE
1D
2D
3D
4D
5D
6D
7D
8D
9D
CLR
GND
NC – No internal connection
Copyright
©
1995, Texas Instruments Incorporated
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
•
DALLAS, TEXAS 75265
9D
CLR
GND
NC
CLK
CLKEN
9Q
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
CLKEN
CLK
1
SN54AS823A, SN74AS823A, SN74AS824A
9-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS231A – JUNE 1984 – REVISED AUGUST 1995
Function Tables
SN54AS823A, SN74AS823A
(each flip-flop)
INPUTS
OE
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
SN74AS824A
(each flip-flop)
INPUTS
OE
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
L
H
Q0
Z
logic symbols
†
SN54AS823A, SN74AS823A
OE
CLR
CLKEN
CLK
1
11
14
13
EN
R
G1
1C2
23
22
21
20
19
18
17
16
15
OE
CLR
CLKEN
CLK
1
11
14
13
SN74AS824A
EN
R
G1
1C2
23
22
21
20
19
18
17
16
15
1D
2D
3D
4D
5D
6D
7D
8D
9D
2
3
4
5
6
7
8
9
10
2D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
1D
2D
3D
4D
5D
6D
7D
8D
9D
2
3
4
5
6
7
8
9
10
2D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
† These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the DW, JT, and NT packages.
2
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DALLAS, TEXAS 75265
SN54AS823A, SN74AS823A, SN74AS824A
9-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS231A – JUNE 1984 – REVISED AUGUST 1995
logic diagrams (positive logic)
SN54AS823A, SN74AS823A
OE
CLR
CLKEN
1
11
14
CLK
1D
13
R
C1
23
1Q
2
1D
To Eight Other Channels
SN74AS824A
OE
CLR
CLKEN
1
11
14
CLK
1D
13
R
C1
23
1Q
2
1D
To Eight Other Channels
Pin numbers shown are for the DW, JT, and NT packages.
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
3
SN54AS823A, SN74AS823A, SN74AS824A
9-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS231A – JUNE 1984 – REVISED AUGUST 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T
A
: SN54AS823A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN74AS823A, SN74AS824A . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54AS823A
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
Pulse duration
CLR low
CLK high or low
CLR high
tsu*
th*
TA
Setup time before CLK↑
↑
Hold time after CLK↑
Operating free-air temperature
Data
CLKEN high or low
CLKEN low
7.5
9.5
8
7
8.5
0
– 55
125
4.5
2
0.8
– 24
32
6.5
8
8
6
7.5
0
0
70
ns
°C
ns
NOM
5
MAX
5.5
SN74AS823A
SN74AS824A
MIN
4.5
2
0.8
– 24
48
NOM
5
MAX
5.5
V
V
V
mA
mA
ns
UNIT
* On products compliant to MIL-STD-883, Class B, this parameter is based on characterization data but is not production tested.
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
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