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SN74CBT16244CDGGR データシート(PDF) 2 Page - Texas Instruments

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部品番号 SN74CBT16244CDGGR
部品情報  16-BIT FET BUS SWITCH 5-V BUS SWITCH WITH-2-V UNDERSHOOT PROTECTION
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

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SN74CBT16244C
16BIT FET BUS SWITCH
5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION
SCDS134A − SEPTEMBER 2003 − REVISED OCTOBER 2003
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CBT16244C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron),
allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the
SN74CBT16244C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring
that the switch remains in the proper OFF state.
The SN74CBT16244C is organized as four 4-bit bus switches with separate output-enable (1OE, 2OE, 3OE,
4OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or as one 16-bit bus switch. When
OE is low, the associated 4-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 4-bit bus switch is OFF, and the high-impedance state
exists between the A and B ports.
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.
FUNCTION TABLE
(each 4-bit bus switch)
INPUT
INPUT/OUTPUT
FUNCTION
INPUT
OE
INPUT/OUTPUT
A
FUNCTION
L
B
A port = B port
H
Z
Disconnect
logic diagram (positive logic)
1A1
SW
1B1
1A4
1OE
SW
1B4
3A1
SW
3B1
3A4
3OE
SW
3B4
47
43
1
36
32
25
2
6
13
17
2A1
SW
2B1
2A4
2OE
SW
2B4
4A1
SW
4B1
4A4
4OE
SW
4B4
41
37
48
30
26
24
8
12
19
23


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