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参数资料
| 型号： | SN74AS856NT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 总线收发器 |
| 英文描述： | AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24 |
| 封装： | 0.300 INCH, PLASTIC, DIP-24 |
| 文件页数： | 1/9页 |
| 文件大小： | 127K |
| 代理商： | SN74AS856NT |
SN54AS856, SN74AS856
8-BIT UNIVERSAL TRANSCEIVER PORT CONTROLLERS
SDAS032A DECEMBER 1983 REVISED MARCH 1985
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Copyright
1985, Texas Instruments Incorporated
1
Package Options Include Plastic Small
Outline Packages, Both Plastic and
Ceramic Chip Carriers, and Standard
Plastic and Ceramic 300-mil DIPs
Buffered 3-State Outputs Drive Bus Lines
Directly
Cascadable to n-Bits
Eight Selectable Transceiver/Port
Functions:
B to A
Register to A and/or B
Off-Line Shifts (A and B Ports in
High-Impedance State)
Shifted to A and/or B
Particularly Suitable for Use in Diagnostics
Analysis Circuitry
Serial Register Provides:
Parallel Storage of Either A or B input
Data
Serial Transmission of Data from Either
A or B Port
Readback Mode B to A
Dependable Texas Instruments Quality and
Reliability
description
The ’AS856 features two 8-bit I/O ports (A1-A8
and B1-B8), an 8-bit parallel-load, serial-in,
parallel-out shift register, and control logic. With
these
features,
this
device
is
capable
of
performing eight selectable transceiver or port
functions, depending on the state of the three
control lines OEA, OEB, and MODE. These
functions include: transferring data from port A to
port B or vice versa (i.e., the transceiver function),
serial shifting data to either or both ports, and
performing off-line shifts (with A and B ports active
as transceivers in a high-impedance state).
Synchronous parallel loading of the internal register can be accomplished from either port on the positive
transition of the clock while serially shifting data in via the SERIN input. The ’AS856 is ideally suited for
applications needing signature-analysis circuitry to enhance system verification and/or fault analysis. All serial
data is shifted right. All outputs are buffer-type outputs designed specifically to drive bus lines directly and all
are 3-state except for Q8, which is a totem-pole output.
The SN54AS856 is characterized for operation over the full military temperature range of 55
°C to 125°C. The
SN74AS856 is characterized for operation from 0
°C to 70°C.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
OEB
OEA
MODE
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
CLK
SERIN
B1
B2
B3
B4
B5
B6
B7
B8
Q8
SN54AS856 . . . JT PACKAGE
SN74AS856 . . . DW OR NT PACKAGE
(TOP VIEW)
32 1
13 14
5
6
7
8
9
10
11
B1
B2
B3
NC
B4
B5
B6
A1
A2
A3
NC
A4
A5
A6
4
15 16 17 18
A8
GND
NC
Q8
B8
B7
MODE
OEA
OEB
NC
SN54AS856 . . . FK PACKAGE
SN74AS856 . . . FN PACKAGE
(TOP VIEW)
28 27 26
25
24
23
22
21
20
19
12
A7
CLK
SERIN
CC
V
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.
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| SN74AS867DW | 功能描述:计数器 IC Synch 8-Bit Up/Down Counter RoHS:否 制造商:NXP Semiconductors 计数器类型:Binary Counters 逻辑系列:74LV 位数:10 计数法: 计数顺序: 工作电源电压:1 V to 5.5 V 工作温度范围:- 40 C to + 125 C 封装 / 箱体:SOT-109 封装:Reel |
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