SN74AS1843 [TI]
9-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS; 9位总线接口D类锁存器具有三态输出
| 型号： | SN74AS1843 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 9-BIT BUS INTERFACE D-TYPE LATCHES WITH 3-STATE OUTPUTS |
| 文件： | 总5页 (文件大小：59K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ꢀꢁ ꢂꢃ ꢄꢀ ꢅꢆ ꢃꢇ
ꢈ ꢉ ꢊꢋ ꢌ ꢍꢊ ꢎꢀ ꢍ ꢋ ꢁꢌ ꢏꢐꢑꢄꢒꢏ ꢍꢓꢉ ꢌ ꢔꢕ ꢏꢍ ꢖꢄꢌ ꢒꢗꢏꢀ ꢍꢘ ꢋꢌ ꢗꢍ ꢇ ꢉ ꢀꢌꢄꢌ ꢏꢍ ꢙ ꢎꢌ ꢕꢎ ꢌꢀ
SDAS127 − APRIL 1987
NT Package
(Top View)
• Center V
and GND Configuration
Provides Minimum Lead Inductance in High
CC
Current Switching Applications
1
24
23
22
21
20
19
18
17
16
15
14
13
5Q
4Q
3Q
2Q
1Q
6Q
7Q
8Q
9Q
PRE
C
2
• 3-State Buffer-Type Outputs Drive
3
Bus-Lines Directly
4
5
• Bus-Structured Pinout
• Provide Extra Bus Driving Latches
Necessary for Wider Address/Data Paths or
Buses With Parity
6
V
CC
7
OC
1D
2D
3D
4D
5D
GND
CLR
9D
8
9
10
11
12
8D
• Buffered Control Inputs to Reduce DC
7D
Loading
6D
• Power-Up High Impedance
• Package Options Include Plastic DIPs. Use
the ′AS843 for Plastic and Ceramic Chip
Carriers and “Small Outline” Package
Options
FUNCTION TABLE
INPUTS
OUTPUT
PRE
CLR
OC
C
D
Q
L
X
L
L
L
L
L
L
X
X
H
H
L
X
X
L
H
L
• Dependable Texas Instruments Quality and
H
H
H
H
Reliability
H
H
H
L
H
X
H
description
Q
O
This 9-bit latch device features three-state outputs
designed specifically for driving highly capacitive
or relatively low-impedance loads. It is particularly
suitable for implementing buffer registers, I/O
ports, bidirectional bus drivers, and working
registers.
X
X
H
X
X
Z
†
logic symbol
7
OC
EN
The nine latches are transparent D-type and have
noninverting data (D) inputs.
20
PRE
S2
R
A buffered output control (OC) input can be used
to place the nine outputs in either a normal logic
state (high or low levels) or a 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 the bus lines in a
bus-organized system without need for interface
or pullup components.
17
CLR
19
C
C1
1D
8
5
1D
2
1Q
9
4
3
2D
2Q
3Q
10
3D
11
2
4D
4Q
The output control (OC) 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 off.
12
1
24
23
22
21
5D
5Q
6Q
7Q
8Q
9Q
13
6D
14
7D
15
8D
The SN74AS1843 is characterized for operation
from 0°C to 70°C.
16
9D
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12,
ꢕꢐ ꢙ ꢓꢎ ꢒ ꢌꢋ ꢙꢁ ꢓ ꢄꢌꢄ ꢚꢛ ꢜ ꢝꢞ ꢟꢠ ꢡꢚꢝ ꢛ ꢚꢢ ꢣꢤ ꢞ ꢞ ꢥꢛꢡ ꢠꢢ ꢝꢜ
ꢡ
Copyright 1987, Texas Instruments Incorporated
ꢦ
ꢤ
ꢧ
ꢨ
ꢚ
ꢣ
ꢠ
ꢡ
ꢚ
ꢝ
ꢛ
ꢩ
ꢠ
ꢡ
ꢥ
ꢪ
ꢕ
ꢞ
ꢝ
ꢩ
ꢤ
ꢣ
ꢡ
ꢢ
ꢣ
ꢝ
ꢛ
ꢜ
ꢝ
ꢞ
ꢟ
ꢝ
ꢢ
ꢦ
ꢥ
ꢣ
ꢚ
ꢜ
ꢚ
ꢣ
ꢠ
ꢡ
ꢚ
ꢝ
ꢛ
ꢢ
ꢦ
ꢭ
ꢥ
ꢠ
ꢞ
ꢞ
ꢡ
ꢫ
ꢡ
ꢥ
ꢮ
ꢡ
ꢥ
ꢞ
ꢕ
ꢟ
ꢢ
ꢩ
ꢝ
ꢜ
ꢡ
ꢌ
ꢥ
ꢬ
ꢠ
ꢢ
ꢦ
ꢋ
ꢛ
ꢥ
ꢢ
ꢢ
ꢡ
ꢞ
ꢢ
ꢤ
ꢟ
ꢯ
ꢥ
ꢛ
ꢡ
ꢢ
ꢩ
ꢢ
ꢡ
ꢢ
ꢠ
ꢛ
ꢩ
ꢠ
ꢛꢝꢡ
ꢞ
ꢩ
ꢞ
ꢠ
ꢛ
ꢪ
ꢞ
ꢝ
ꢤ
ꢣ
ꢚ
ꢝ
ꢛ
ꢞ
ꢝ
ꢣ
ꢚ
ꢛ
ꢝ
ꢥ
ꢛ
ꢥ
ꢣ
ꢥ
ꢢ
ꢢ
ꢠ
ꢞ
ꢚ
ꢨ
ꢮ
ꢚ
ꢛ
ꢣ
ꢨ
ꢤ
ꢩ
ꢥ
ꢡ
ꢥ
ꢢ
ꢡꢚ
ꢛ
ꢯ
ꢝ
ꢜ
ꢠ
ꢨ
ꢨ
ꢦ
ꢠ
ꢞ
ꢠ
ꢟ
ꢥ
ꢡ
ꢥ
ꢞ
ꢢ
ꢪ
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢆꢃ ꢇ
ꢍ
ꢈ
ꢉ
ꢊ
ꢋ
ꢌ
ꢍ
ꢊ
ꢎ
ꢀ
ꢋ
ꢁ
ꢌ
ꢏ
ꢐ
ꢑ
ꢄ
ꢒ
ꢏ
ꢍ
ꢓ
ꢉ
ꢌ
ꢔ
ꢕ
ꢏ
ꢍ
ꢖ
ꢄ
ꢌ
ꢒ
ꢗ
ꢏ
ꢀ
ꢍ
ꢘ
ꢋ
ꢌ
ꢗ
ꢍ
ꢇ
ꢉ
ꢀ
ꢌ
ꢄ
ꢌ
ꢏ
ꢍ
ꢙꢎ
ꢌ
ꢕ
ꢎ
ꢌ
ꢀ
SDAS127 − APRIL 1987
logic diagram (positive logic)
7
OC
PRE
CLR
C
20
17
19
S
5
4
3
2
1
C1
1D
R
8
1D
2D
3D
4D
5D
6D
7D
8D
9D
1Q
2Q
3Q
4Q
5Q
6Q
7Q
8Q
9Q
S
C1
1D
R
9
S
C1
1D
R
10
11
12
13
14
15
16
S
C1
1D
R
S
C1
1D
R
S
24
23
22
21
C1
1D
R
S
C1
1D
R
S
C1
1D
R
S
C1
1D
R
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
CC
Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. 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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2
ꢀꢁ ꢂꢃ ꢄꢀ ꢅꢆ ꢃꢇ
ꢈ ꢉ ꢊꢋ ꢌ ꢍꢊ ꢎꢀ ꢍ ꢋ ꢁꢌ ꢏꢐꢑꢄꢒꢏ ꢍꢓꢉ ꢌ ꢔꢕ ꢏꢍ ꢖꢄꢌ ꢒꢗꢏꢀ ꢍꢘ ꢋꢌ ꢗꢍ ꢇ ꢉ ꢀꢌꢄꢌ ꢏꢍ ꢙ ꢎꢌ ꢕꢎ ꢌꢀ
SDAS127 − APRIL 1987
recommended operating conditions
MIN
4.5
2
NOM MAX
UNIT
V
V
V
V
Supply voltage
5
5.5
CC
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
V
IH
0.8
−24
48
V
IL
I
I
mA
mA
OH
OL
CLR or PRE low
C high
4
4
t
w
Pulse duration, enable C high
ns
t
t
Setup time, data before enable C ↓
Hold time, data after enable C ↓
2.5
2.5
15
14
0
ns
ns
su
h
PRE
CLR
t
Recovery time
ns
r
T
Operating free-air temperature
70
°C
A
electrical characteristics over full ranges of recommended operating conditions (unless otherwise
noted)
†
TYP
PARAMETER
TEST CONDITIONS
MIN
MAX
UNIT
V
V
V
V
V
V
V
V
V
V
V
V
V
= 4.5 V,
= 4.5 V,
= 4.5 V,
= 4.5 V,
= 4.5 V,
= 4.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
I = − 18 mA
−1.2
V
IK
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
CC
I
I
I
I
I
I
= − 2 mA
= − 15 mA
= − 24 mA
= 32 mA
= 48 mA
= 2.7 V
V
−2
OH
OH
OH
OL
OL
CC
2.4
V
OH
3.2
V
2
V
V
OL
0.35
0.5
50
I
V
V
µA
µA
OZH
OZL
I
O
O
I
I
I
I
I
= 0.4 V
−50
0.1
20
V = 7 V
I
mA
µA
V = 2.7 V
I
IH
V = 0.4 V
I
−.05
−112
62
mA
mA
IL
‡
V
O
= 2.25 V
−30
O
Output high
37
56
56
I
V
CC
= 5.5 V,
Output low
92
mA
CC
Outputs disabled
92
†
‡
All typical values are at V
= 5 V, T = 25°C.
A
CC
The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
.
OS
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
ꢀꢁ ꢂ ꢃꢄ ꢀꢅ ꢆꢃ ꢇ
ꢈ ꢉ ꢊꢋ ꢌ ꢍ ꢊ ꢎꢀ ꢍ ꢋ ꢁꢌ ꢏ ꢐꢑꢄꢒ ꢏꢍ ꢓ ꢉ ꢌꢔ ꢕ ꢏꢍ ꢖꢄꢌ ꢒꢗꢏꢀ ꢍꢘ ꢋꢌ ꢗꢍ ꢇ ꢉ ꢀꢌꢄꢌ ꢏꢍ ꢙꢎ ꢌꢕ ꢎꢌꢀ
SDAS127 − APRIL 1987
switching characteristics over recommended ranges of supply voltage and free-air temperature
(see Note 2)
V
= 4.5 V to 5.5 V,
CC
C
= 50 pF,
= 500 Ω,
= 500 Ω,
L
1
2
R
R
FROM
(INPUT)
TO
(OUTPUT)
PARAMETER
UNIT
T
A
= MIN to MAX
MIN
1
MAX
t
t
t
t
t
t
6.5
9
PLH
PHL
PLH
PHL
PLH
PHL
PZH
ns
ns
D
C
Q
Q
1
2
12
12
10
13
10.5
13.5
8
2
PRE
CLR
Q
Q
2
ns
ns
2
t
2
ns
ns
OC
OC
Q
Q
t
2
PZL
t
1
PHZ
t
1
8
PLZ
NOTE 2: Load circuit and voltage waveforms are shown in Section 1 of the ALS/AS Logic Data Book, 1986.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
4
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements,
and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should
obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are
sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard
warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where
mandated by government requirements, testing of all parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
applications using TI components. To minimize the risks associated with customer products and applications, customers should provide
adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right,
or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information
published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a
warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual
property of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied
by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive
business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all
express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not
responsible or liable for any such statements.
TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably
be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing
such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products
and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be
provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in
such safety-critical applications.
TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are
specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military
specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at
the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use.
TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are
designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated
products in automotive applications, TI will not be responsible for any failure to meet such requirements.
Following are URLs where you can obtain information on other Texas Instruments products and application solutions:
Products
Applications
Audio
Automotive
Broadband
Digital Control
Medical
Amplifiers
Data Converters
DSP
Clocks and Timers
Interface
amplifier.ti.com
dataconverter.ti.com
dsp.ti.com
www.ti.com/clocks
interface.ti.com
logic.ti.com
www.ti.com/audio
www.ti.com/automotive
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/medical
www.ti.com/military
Logic
Military
Power Mgmt
Microcontrollers
RFID
power.ti.com
microcontroller.ti.com
www.ti-rfid.com
Optical Networking
Security
Telephony
Video & Imaging
Wireless
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
RF/IF and ZigBee® Solutions www.ti.com/lprf
www.ti.com/wireless
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2008, Texas Instruments Incorporated
相关型号：
SN74AS194DRG4
AS SERIES, 4-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PDSO16, GREEN, PLASTIC, SOIC-16
TI
SN74AS194FN-00
AS SERIES, 4-BIT BIDIRECTIONAL PARALLEL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PQCC20
TI
©2020 ICPDF网 联系我们和版权申明