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74ABT899DB データシート(PDF) 4 Page - NXP Semiconductors

部品番号 74ABT899DB
部品情報  9-bit dual latch transceiver with 8-bit parity generator/checker 3-State
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ABT899DB データシート(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ABT899
9-bit dual latch transceiver with 8-bit parity
generator/checker (3-State)
1998 Jan 16
4
4
5
1
0
mux
9–bit
Output
Buffer
OE
9–bit
Output
Buffer
9–bit
Transparent
Latch
LE
Parity
Generator
Parity
Generator
1
0
mux
OE
9–bit
Transparent
Latch
LE
27
3
6
7
8
9
10
11
12
16
1
17
13
26
24
23
25
22
21
20
19
18
2
15
OEB
LEA
A0
A1
A2
A3
A4
A5
A6
A7
APAR
OEA
SEL
ODD/
EVEN
LEB
B7
BPAR
B6
B5
B4
B3
B2
B1
B0
ERRA
ERRB
SA00292
FUNCTION TABLE
INPUTS
OPERATING MODE
OEB
OEA
SEL
LEA
LEB
H
H
X
X
X
3-State A bus and B bus (input A & B simultaneously)
H
L
L
L
H
B
→ A, transparent B latch, generate parity from B0 - B7, check B bus parity
H
L
L
H
H
B
→ A, transparent A & B latch, generate parity from B0 - B7, check A & B bus parity
H
L
L
X
L
B
→ A, B bus latched, generate parity from latched B0 - B7 data, check B bus parity
H
L
H
X
H
B
→ A, transparent B latch, parity feed-through, check B bus parity
H
L
H
H
H
B
→ A, transparent A & B latch, parity feed-through, check A & B bus parity
L
H
L
H
X
A
→ B, transparent A latch, generate parity from A0 - A7, check A bus parity
L
H
L
H
H
A
→ B, transparent A & B latch, generate parity from A0 - A7, check A & B bus parity
L
H
L
L
X
A
→ B, A bus latched, generate parity from latched A0 - A7 data, check A bus parity
L
H
H
H
L
A
→ B, transparent A latch, parity feed-through, check A bus parity
L
H
H
H
H
A
→ B, transparent A & B latch, parity feed-through, check A & B bus parity
L
L
X
X
X
Output to A bus and B bus (NOT ALLOWED)
H = High voltage level
L
= Low voltage level
X = Don’t care


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