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參數(shù)資料
| 型號： | SN54AS877 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-Bit Universal Transceiver Port Controllers(8位通用收發(fā)端口控制器) |
| 中文描述： | 8位通用收發(fā)器端口控制器（8位通用收發(fā)端口控制器） |
| 文件頁數(shù)： | 1/9頁 |
| 文件大?。?/td> | 193K |
| 代理商： | SN54AS877 |
SN54AS877, SN74AS877
8-BIT UNIVERSAL TRANSCEIVER PORT CONTROLLERS
SDAS234 – D2661, DECEMBER 1982 – REVISED AUGUST 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
Cascaded to n-Bits
Eight Selectable Transceiver/Port
Functions:
A to B or B to A
Register to A or Register to B
Shifted to A or Shifted to B
Off-Line Shifts (A and B Ports in
High-Impedance State)
Register Clear
Particularly Suitable for Use in Signature
Analysis Circuitry
Serial Register Provides:
Parallel Storage of Either A or B Input
Data
Serial Transmission of Data from Either
A or B Port
Dependable Texas Instruments Quality and
Reliability
description
The ’AS877 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
select lines S0, S1, and S2. These functions
include: transferring data from port A to port B or
vice versa (i.e., the transceiver function),
transferring data from the register to either port,
serial shifting data to either port, performing off-line shifts (with A and B ports in high-impedance state), and
clearing the register. 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 ’AS877 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 SN54AS877 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74AS877 is characterized for operation from 0
°
C to 70
°
C.
1
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4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
S0
S1
S2
A1
A2
A3
A4
A5
A6
A7
A8
GND
V
CC
CLK
SERIN
B1
B2
B3
B4
B5
B6
B7
B8
Q8
SN54AS877 . . . JT PACKAGE
SN74AS877 . . . DW OR NT PACKAGE
(TOP VIEW)
3 2 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
A
G
N
Q
B
B
S
S
S
N
SN54AS877 . . . JT PACKAGE
SN74AS877 . . . DW OR NT PACKAGE
(TOP VIEW)
28 27 2625
24
23
22
21
20
19
12
A
C
S
C
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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