參數(shù)資料
型號(hào)： SN74CBT6845CPWRG4
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 總線收發(fā)器
英文描述： CBT/FST/QS/5C/B SERIES, OCTAL 1-BIT DRIVER, TRUE OUTPUT, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁(yè)數(shù)： 12/21頁(yè)
文件大?。?/td> 791K
代理商： SN74CBT6845CPWRG4
SN74CBT6845C
8BIT FET BUS SWITCH WITH PRECHARGED OUTPUTS
5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION
SCDS140 OCTOBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CBT6845C is an 8-bit bus switch with a single output-enable (OE) input. When OE is low, the 8-bit
bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When
OE is high, the 8-bit bus switch is OFF, and a high-impedance state exists between the A and B ports. The B
port is precharged to BIASV through the equivalent of a 10-k
resistor when OE is high, or if the device is
powered down (VCC = 0 V).
During insertion (or removal) of a card into (or from) an active bus, the card’s output voltage may be close to
GND. When the connector pins make contact, the card’s parasitic capacitance tries to force the bus signal to
GND, creating a possible glitch on the active bus. This glitching effect can be reduced by using a bus switch
with precharged bias voltage (BIASV) of the bus switch equal to the input threshold voltage level of the receivers
on the active bus. This method will ensure that any glitch produced by insertion (or removal) of the card will not
cross the input threshold region of the receivers on the active bus, minimizing the effects of live-insertion noise.
This device is fully specified for partial-power-down applications using Ioff. The Ioff feature ensures that
damaging current will not backflow through the device when it is powered down. The device has isolation during
power off.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QFN RGY
Tape and reel
SN74CBT6845CRGYR
CT6845C
SOIC DW
Tube
SN74CBT6845CDW
CBT6845C
SOIC DW
Tape and reel
SN74CBT6845CDWR
CBT6845C
SSOP DB
Tube
SN74CBT6845CDB
CT6845C
40
°C to 85°C
SSOP DB
Tape and reel
SN74CBT6845CDBR
CT6845C
40 C to 85 C
SSOP (QSOP) DBQ
Tape and reel
SN74CBT6845CDBQR
CBT6845C
TSSOP PW
Tube
SN74CBT6845CPW
CT6845C
TSSOP PW
Tape and reel
SN74CBT6845CPWR
CT6845C
TVSOP DGV
Tape and reel
SN74CBT6845CDGVR
CT6845C
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
FUNCTION TABLE
INPUT
INPUT/OUTPUT
FUNCTION
INPUT
OE
INPUT/OUTPUT
A
FUNCTION
L
B
A port = B port
H
Z
Disconnect
B port = BIASV
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN74CBT6845CRGYR 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-Bit FET 5-V Bus Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
SN74CBT6845CRGYRG4 功能描述:數(shù)字總線開(kāi)關(guān) IC 8-Bit FET 5-V Bus Switch RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
SN74CBTD16210DGGR 功能描述:數(shù)字總線開(kāi)關(guān) IC 20bit FET RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
SN74CBTD16210DGVR 功能描述:數(shù)字總線開(kāi)關(guān) IC 20bit FET RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
SN74CBTD16210DL 功能描述:數(shù)字總線開(kāi)關(guān) IC 20bit FET RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)數(shù)量:24 傳播延遲時(shí)間:0.25 ns 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TSSOP-56 封裝:Reel
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