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74CBT16800CDGGRG4 数据表(PDF) 2 Page - Texas Instruments

部件名 74CBT16800CDGGRG4
功能描述  20-BIT FET BUS SWITCH WITH PRECHARGED OUTPUTS 5-V BUS SWITCH WITH -2-V UNDERSHOOT PROTECTION
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

74CBT16800CDGGRG4 数据表(HTML) 2 Page - Texas Instruments

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SN74CBT16800C
20BIT FET BUS SWITCH WITH PRECHARGED OUTPUTS
5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION
SCDS117C − JANUARY 2003 − REVISED OCTOBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CBT16800C is organized as two 10-bit bus switches with separate output-enable (1OE, 2OE) inputs.
It can be used as two 10-bit bus switches or as one 20-bit bus switch. When OE is low, the associated 10-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 associated 10-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
Ω 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
SSOP − DL
Tube
SN74CBT16800CDL
CBT16800C
SSOP − DL
Tape and reel
SN74CBT16800CDLR
CBT16800C
−40
°C to 85°C
TSSOP − DGG
Tube
SN74CBT16800CDGG
CBT16800C
−40 C to 85 C
TSSOP − DGG
Tape and reel
SN74CBT16800CDGGR
CBT16800C
TVSOP − DGV
Tape and reel
SN74CBT16800CDGVR
CY800C
† Package drawings, standard packing quantities, thermal data, symbolization, and PCB design
guidelines are available at www.ti.com/sc/package.
FUNCTION TABLE
(each 10-bit bus switch)
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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