參數(shù)資料
型號(hào)： MC74LCX543DW
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 總線收發(fā)器
英文描述： LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
封裝： PLASTIC, SOIC-24
文件頁(yè)數(shù)： 11/42頁(yè)
文件大小： 360K
代理商： MC74LCX543DW
LCX Family Characteristics
LCX DATA
BR1339 — REV 3
15
MOTOROLA
LCX — Low–Voltage CMOS Logic (WIth
5V–Tolerant Inputs and Outputs)
The LCX family represents Motorola’s Low–Voltage
CMOS family. These devices offer mixed 3V–5V capability
and are recommended for applications where 3.3V and 5V
subsystems interface with one another and where low power
consumption is a necessity. The input and output (Note 1)
structures of the LCX family of products will tolerate input and
output node exposure to signals or DC levels that exceed the
VCC level (Note 2). Refer to Figure 11 for schematic
description of a typical LCX circuit. Note that the output
PMOS device P1 has its bulk potential supplied by the output
of the comparator X1 rather than by VCC as in conventional
CMOS. The circuitry contained within the comparator is
designed such that the output is always the greater of VCC or
VO. This technique circumvents the P+/N– bulk–source
forward junction that usually appears between the PMOS
drain at the output and the bulk connection of the output
PMOS which is usually tied to VCC. Eliminating this junction is
fundamental to the powered–down high Z and overvoltage
tolerance features that distinguish Motorola’s LCX family
from other Low–Voltage CMOS products.
NOTE 1: U.S. Patent 5,451,889.
NOTE 2: Output overvoltage is permitted unconditionally for 3–stated outputs.
For active outputs, see datasheet.
LVX-Low Voltage Dual Supply Translating
Transceivers
In applications where 3.3V signals must be “stepped up” to
5V, in order to interface full swing CMOS busses, LCX may
not be the proper solution. The LVX translating transceiver
designs have an entirely different approach to solve the
mixed supply interface problem. These devices are not
overvoltage tolerant, but rather true voltage translators —
meaning that they receive 3V signals and output 5V signals,
and receive 5V signals and output 3V signals (which can also
be accomplished with LCX). This is done by dividing the
devices internally so that the A–side circuitry is isolated from
the B–side circuitry. The dual supply architecture allows the
LVX translators to interface 3V and 5V signals with near–zero
static power dissipation.
The MC74LVX4245 A–side is dedicated to 5V operation,
with VCCA specified over the 4.5V–5.5V range. The B–side is
dedicated to 3.3V, with VCCB specified over the 2.7V–3.6V
range.
The MC74LVXC3245 offers enhanced interfacing
features. The B–side is designed to operate over an
extended range of I/O and supply levels. The VCCB is
permitted to be set to any value between 2.7V and 5.5V. The
I/O levels on the B–side will track or scale automatically
according to the level set on VCCB. The B–side operation is
completely independent of VCCA. The A–port and control
input buffers are referenced to VCCA, totally independent of
VCCB. The configurable dual supply translating transceiver,
LVXC3245, is designed to tolerate floating inputs on the
B–port when VCCA and the control signals are set to valid
operating levels. The combination of this on–the–fly interface
flexibility together with “empty socket” tolerance is intended
to benefit designers of PC card systems (or PCMCIA) where
expansion cards with different supply potentials must be
accommodated.
The LVX dual supply translators offer switching speeds
equivalent to 5V FCT/FAST but with low ground noise and
very low power dissipation.
Data
Enable
Input Stage
P1
X1
Output
VDD
VCC
Figure 11. Simplified LCX Schematic Diagram
相關(guān)PDF資料
PDF描述
MC74LCX573DTEL LVC/LCX/Z SERIES, 8-BIT DRIVER, TRUE OUTPUT, PDSO20
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MC74LCX652DWR2 LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
MC74LCX652SDR2 LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC74LCX573DT 功能描述:閉鎖 2-3.6V Octal 3-State RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel
MC74LCX573DTG 功能描述:閉鎖 2-3.6V Octal 3-State Transparent RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel
MC74LCX573DTR2 功能描述:閉鎖 2-3.6V Octal 3-State RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel
MC74LCX573DTR2G 功能描述:閉鎖 2-3.6V Octal 3-State Transparent RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel
MC74LCX573DW 功能描述:閉鎖 2-3.6V Octal 3-State RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel
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