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| 型號： | SN74ABTH1826520A |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Scan Test Devices With 18 Bit Universal Bus Transceivers And Registers( 掃描檢測裝置帶18位總線收發(fā)器和寄存器) |
| 中文描述： | 掃描測試設(shè)備與18位通用總線收發(fā)器和寄存器（掃描檢測裝置帶18位總線收發(fā)器和寄存器） |
| 文件頁數(shù)： | 3/36頁 |
| 文件大小： | 848K |
| 代理商： | SN74ABTH1826520A |
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SN54ABTH18652A, SN54ABTH182652A, SN74ABTH18652A, SN74ABTH182652A
SCAN TEST DEVICES WITH
18-BIT BUS TRANSCEIVERS AND REGISTERS
SCBS167D – AUGUST 1993 – REVISED JULY 1996
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
In the test mode, the normal operation of the SCOPE
bus transceivers and registers is inhibited, and the test
circuitry is enabled to observe and control the I/O boundary of the device. When enabled, the test circuitry
performs boundary-scan test operations according to the protocol described in IEEE Standard 1149.1-1990.
Four dedicated test pins observe and control the operation of the test circuitry: test data input (TDI), test data
output (TDO), test mode select (TMS), and test clock (TCK). Additionally, the test circuitry performs other testing
functions such as parallel-signature analysis (PSA) on data inputs and pseudo-random pattern generation
(PRPG) from data outputs. All testing and scan operations are synchronized to the TAP interface.
Improved scan efficiency is accomplished through the adoption of a one boundary-scan cell (BSC) per I/O pin
architecture. This architecture is implemented in such a way as to capture the most pertinent test data. A
PSA/COUNT instruction is also included to ease the testing of memories and other circuits where a binary count
addressing scheme is useful.
Active bus-hold circuitry holds unused or floating data inputs at a valid logic level.
The B-port outputs of ’ABTH182652A, which are designed to source or sink up to 12 mA, include 25-
series
resistors to reduce overshoot and undershoot.
The SN54ABTH18652A and SN54ABTH182652A are characterized for operation over the full military
temperature range of –55
°
C to 125
°
C. The SN74ABTH18652A and SN74ABTH182652A are characterized for
operation from –40
°
C to 85
°
C.
FUNCTION TABLE
(normal mode, each 9-bit section)
INPUTS
DATA I/O
OPERATION OR FUNCTION
OEAB
OEBA
CLKAB
CLKBA
SAB
SBA
A1 – A9
B1 – B9
L
H
L
↑
↑
↑
L
↑
X
L
↑
L
↑
↑
↑
X
X
X
Input disabled
Input disabled
Isolation
L
H
X
X
Input
Input
Store A and B data
X
H
X
X
X
Input
Unspecified
Store A, hold B
H
H
X
Input
Output
Store A in both registers
L
X
X
X
X
Unspecified
Input
Hold A, store B
L
L
X
Output
Input
Store B in both registers
L
L
X
L
Output
Input
Real-time B data to A bus
L
L
X
X
X
H
Output
Input
Stored B data to A bus
H
H
X
X
L
X
Input
Output
Real-time A data to B bus
H
H
X
X
H
X
Input
Output
Stored A data to B bus
H
L
X
X
H
H
Output
Output
Stored A data to B bus and
stored B data to A bus
The data-output functions can be enabled or disabled by a variety of level combinations at OEAB or OEBA. Data-input functions are always
enabled; i.e., data at the bus pins is stored on every low-to-high transition on the clock inputs.
Select control = L: clocks can occur simultaneously.
Select control = H: clocks must be staggered to load both registers.
相關(guān)PDF資料 |
PDF描述 |
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| SN54ABTH18652A | Scan Test Devices With 18 Bit Universal Bus Transceivers and Registers( 掃描檢測裝置，帶18位總線收發(fā)器和寄存器) |
| SN54ABTH245FK | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| SN74ABTH245DB | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| SN74ABTH245DGV | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
| SN74ABTH245PW | OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74ABTH182652APM | 功能描述:特定功能邏輯 Device w/18-Bit Trnscvr & Register RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABTH18502APM | 功能描述:特定功能邏輯 Device w/18-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABTH18502APMG4 | 功能描述:特定功能邏輯 Device w/18-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABTH18502APMR | 功能描述:特定功能邏輯 Device w/18-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABTH18504APM | 功能描述:特定功能邏輯 Device w/20-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
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