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Texas Instruments (TI) Electronic Components Datasheet

SN74AS824A Datasheet

9-Bit Bus Interface Flip-Flops

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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
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, SN74AS823A, SN74AS824A
9-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SDAS231A – JUNE 1984 – REVISED AUGUST 1995
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 VCC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 CLKEN
13 CLK
SN54AS823A . . . FK PACKAGE
(TOP VIEW)
4 3 2 1 28 27 26
3D 5
25 3Q
4D 6
24 4Q
5D 7
23 5Q
NC 8
22 NC
6D 9
21 6Q
7D 10
20 7Q
8D 11
19 8Q
12 13 14 15 16 17 18
SN74AS824A . . . 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 VCC
23 1Q
22 2Q
21 3Q
20 4Q
19 5Q
18 6Q
17 7Q
16 8Q
15 9Q
14 CLKEN
13 CLK
NC – No internal connection
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
Copyright © 1995, Texas Instruments Incorporated
1


Texas Instruments (TI) Electronic Components Datasheet

SN74AS824A Datasheet

9-Bit Bus Interface Flip-Flops

No Preview Available !

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
OUTPUT
OE CLR CLKEN CLK D
Q
L L X XX
L
LH L H
H
LH L L
L
LH H XX
HX X XX
Q0
Z
SN74AS824A
(each flip-flop)
INPUTS
OE CLR CLKEN CLK D
L L X XX
LH L H
LH L L
LH H XX
HX X XX
OUTPUT
Q
L
L
H
Q0
Z
logic symbols
OE
CLR
CLKEN
CLK
1
11
14
13
SN54AS823A, SN74AS823A
EN
R
G1
1C2
OE
CLR
CLKEN
CLK
1
11
14
13
2
1D
3
2D
4
3D
5
4D
6
5D
7
6D
8
7D
9
8D
10
9D
2D
23
1Q
22
2Q
21
3Q
20
4Q
19
5Q
18
6Q
17
7Q
16
8Q
15
9Q
2
1D
3
2D
4
3D
5
4D
6
5D
7
6D
8
7D
9
8D
10
9D
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.
SN74AS824A
EN
R
G1
1C2
2D
23
1Q
22
2Q
21
3Q
20
4Q
19
5Q
18
6Q
17
7Q
16
8Q
15
9Q
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74AS824A
Description 9-Bit Bus Interface Flip-Flops
Maker Texas
Total Page 12 Pages
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