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| 型号： | SN74LVCH16543AGQLR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 总线收发器 |
| 英文描述： | LVC/LCX/Z SERIES, DUAL 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PBGA56 |
| 封装： | PLASTIC, VFBGA-56 |
| 文件页数： | 11/18页 |
| 文件大小： | 480K |
| 代理商： | SN74LVCH16543AGQLR |
www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
GQL OR ZQL PACKAGE
(TOP VIEW)
1
2
3
4
A
B
C
D
E
F
G
H
J
K
5
6
SN74LVCH16543A
16-BIT REGISTERED TRANSCEIVER
WITH 3-STATE OUTPUTS
SCAS317M – NOVEMBER 1993 – REVISED MARCH 2005
The A-to-B enable (CEAB) input must be low to enter data from A or to output data from B. If CEAB is low and
LEAB is low, the A-to-B latches are transparent; a subsequent low-to-high transition of LEAB puts the A latches
in the storage mode. With CEAB and OEAB both low, the 3-state B outputs are active and reflect the data
present at the output of the A latches. Data flow from B to A is similar, but requires using the CEBA, LEBA, and
OEBA inputs.
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.
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in
a mixed 3.3-V/5-V system environment.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or
pulldown resistors with the bus-hold circuitry is not recommended. The bus-hold circuitry is part of the input
circuit and is not disabled by OE or DIR.
TERMINAL ASSIGNMENTS
1
2
3
4
5
6
A
1CEAB
1LEAB
1OEAB
1OEBA
1LEBA
1CEBA
B
1A2
1A1
GND
1B1
1B2
C
1A4
1A3
VCC
1B3
1B4
D
1A6
1A5
GND
1B5
1B6
E
1A8
1A7
1B7
1B8
F
2A1
2A2
2B2
2B1
G
2A3
2A4
GND
2B4
2B3
H
2A5
2A6
VCC
2B6
2B5
J
2A7
2A8
GND
2B8
2B7
K
2CEAB
2LEAB
2OEAB
2OEBA
2LEBA
2CEBA
2
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