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參數(shù)資料
| 型號： | SCAN18374TSSCX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 總線收發(fā)器 |
| 中文描述： | SCAN/JTAG/3J SERIES, DUAL 9-BIT BOUNDARY SCAN DRIVER, TRUE OUTPUT, PDSO56 |
| 封裝： | 0.300 INCH, MO-118, SSOP-56 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 99K |
| 代理商： | SCAN18374TSSCX |
www.fairchildsemi.com
4
SCAN18374
T
Description of Boundary-Scan Circuitry
The scan cells used in the BOUNDARY-SCAN register are
one of the following two types depending upon their loca-
tion. Scan cell TYPE1 is intended to solely observe system
data, while TYPE2 has the additional ability to control sys-
tem data.
Scan cell TYPE1 is located on each system input pin while
scan cell TYPE2 is located at each system output pin as
well as at each of the two internal active-high output enable
signals. AOE controls the activity of the A-outputs while
BOE controls the activity of the B-outputs. Each will acti-
vate their respective outputs by loading a logic high.
The BYPASS register is a single bit shift register stage
identical to scan cell TYPE1. It captures a fixed logic low.
Bypass Register Scan Chain Definition
Logic 0
The INSTRUCTION register is an eight-bit register which
captures the value 00111101.
The two least significant bits of this captured value (01) are
required by IEEE Std 1149.1. The upper six bits are unique
to the SCAN18374T device. SCAN CMOS Test Access
Logic devices do not include the IEEE 1149.1 optional
identification register. Therefore, this unique captured
value can be used as a “pseudo ID” code to confirm that
the correct device is placed in the appropriate location in
the boundary scan chain.
Instruction Register Scan Chain Definition
MSB
→ LSB
Scan Cell TYPE1
Scan Cell TYPE2
Instruction Code
Instruction
00000000
EXTEST
10000001
SAMPLE/PRELOAD
10000010
CLAMP
00000011
HIGHZ
All Others
BYPASS
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SCAN1837TSSC | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Transparent Latch with 3-STATE Outputs |
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| SCAN18540T | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Inverting Line Driver with TRI-STATE Outputs |
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| SCAN18540TSSC | 功能描述:緩沖器和線路驅(qū)動器 Inverting Line Drv RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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