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參數(shù)資料
| 型號： | LDHT245 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 16-BIT DUAL-SUPPLY BUS TRANSCEIVER WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS |
| 中文描述： | 16位雙電源總線收發(fā)器可配置電壓轉換和三態(tài)輸出 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 358K |
| 代理商： | LDHT245 |
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
Active bus-hold circuitry holds unused or undriven data inputs at a valid logic state. Use of pullup or pulldown
resistors with the bus-hold circuitry is not recommended.
GQL OR ZQL PACKAGE
(TOP VIEW)
J
H
G
F
E
D
C
B
A
2
1
3
4
6
5
K
SN74LVCH16T245
16-BIT DUAL-SUPPLY BUS TRANSCEIVER
WITH CONFIGURABLE VOLTAGE TRANSLATION AND 3-STATE OUTPUTS
SCES635A–JULY 2005–REVISED AUGUST 2005
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
The V
isolation feature ensures that if either V
input is at GND, then all outputs are in the high-impedance
state. The bus-hold circuitry on the powered-up side always stays active.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
TERMINAL ASSIGNMENTS
(1)
1
2
3
4
5
6
A
B
C
D
E
F
G
H
J
K
1DIR
1B2
1B4
1B6
1B8
2B1
2B3
2B5
2B7
2DIR
NC
1B1
1B3
1B5
1B7
2B2
2B4
2B6
2B8
NC
NC
GND
V
CCB
GND
NC
GND
V
CCA
GND
NC
1A1
1A3
1A5
1A7
2A2
2A4
2A6
2A8
NC
1OE
1A2
1A4
1A6
1A8
2A1
2A3
2A5
2A7
2OE
GND
V
CCB
GND
NC
GND
V
CCA
GND
NC
(1)
NC – No internal connection
FUNCTION TABLE
(1)
(EACH 16-BIT SECTION)
CONTROL INPUTS
OE
L
L
H
OUTPUT CIRCUITS
A PORT
Enabled
Hi-Z
Hi-Z
OPERATION
DIR
L
H
X
B PORT
Hi-Z
Enabled
Hi-Z
B data to A bus
A data to B bus
Isolation
(1)
Input circuits of the data I/Os are always active.
2
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