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SN54ABT16657 数据表(PDF) 2 Page - Texas Instruments

部件名 SN54ABT16657
功能描述  16-BIT TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS AND 3-STATE OUTPUTS
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN54ABT16657 数据表(HTML) 2 Page - Texas Instruments

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SN54ABT16657, SN74ABT16657
16-BIT TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS
AND 3-STATE OUTPUTS
SCBS103B – FEBRUARY 1992 – REVISED JANUARY 1997
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
In the receive mode, after the 1B (or 2B) bus is polled to determine the number of high bits, the 1ERR (or 2ERR)
output logic level indicates whether or not the data to be received exhibits the correct parity sense. For example,
if 1ODD/EVEN is high (odd parity selected), 1PARITY is high, and there are three high bits on the 1B bus, then
1ERR is low, indicating a parity error.
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.
The SN54ABT16657 is characterized for operation over the full military temperature range of –55
°C to 125°C.
The SN74ABT16657 is characterized for operation from –40
°C to 85°C.
FUNCTION TABLE
(each 8-bit section)
NUMBER OF A OR B
INPUTS
INPUT/OUTPUT
OUTPUTS
NUMBER OF A OR B
INPUTS THAT ARE HIGH
OE
T/R
ODD/EVEN
INPUT/OUTPUT
PARITY
ERR
OUTPUT MODE
L
H
H
H
Z
Transmit
L
HL
L
Z
Transmit
02468
L
LH
H
H
Receive
0, 2, 4, 6, 8
L
LH
L
L
Receive
L
LL
H
L
Receive
L
LL
L
H
Receive
L
H
H
L
Z
Transmit
L
HL
H
Z
Transmit
1357
L
LH
H
L
Receive
1, 3, 5, 7
L
LH
L
H
Receive
L
LL
H
H
Receive
L
LL
L
L
Receive
Don’t care
H
X
X
Z
Z
Z


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