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SN74VMEH22501A-EP bảng dữ liệu(PDF) 3 Page - Texas Instruments

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SN74VMEH22501AEP
8BIT UNIVERSAL BUS TRANSCEIVER AND TWO 1BIT BUS TRANSCEIVERS
WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND 3STATE OUTPUTS
SCES625 − FEBRUARY 2005
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
terminal assignments
123456
A
1OEBY
NC
NC
NC
NC
1OEAB
B
1Y
1A
GND
GND
VCC
1B
C
2Y
2A
VCC
VCC
BIAS VCC
2B
D
3A1
2OEBY
GND
GND
2OEAB
3B1
E
3A2
LE
VCC
3B2
F
3A3
OE
VCC
3B3
G
3A4
CLKBA
GND
GND
CLKAB
3B4
H
3A5
3A6
VCC
VCC
3B6
3B5
J
3A7
3A8
GND
GND
3B8
3B7
K
DIR
NC
NC
NC
NC
VCC
NC − No internal connection
functional description
The SN74CVMEH22501A−EP is a high-drive (–48/64 mA), 8-bit UBT transceiver containing D-type latches and
D-type flip-flops for data-path operation in transparent, latched, or flip-flop modes. Data transmission is true logic.
The device is uniquely partitioned as 8-bit UBT transceivers with two integrated 1-bit three-wire bus transceivers.
functional description for two 1-bit bus transceivers
The OEAB inputs control the activity of the 1B or 2B port. When OEAB is high, the B-port outputs are active. When
OEAB is low, the B-port outputs are disabled.
Separate 1A and 2A inputs and 1Y and 2Y outputs provide a feedback path for control and diagnostics monitoring.
The OEBY inputs control the 1Y or 2Y outputs. When OEBY is low, the Y outputs are active. When OEBY is high,
the Y outputs are disabled.
The OEBY and OEAB inputs can be tied together to form a simple direction control where an input high yields A
data to B bus and an input low yields B data to Y bus.
1-BIT BUS TRANSCEIVER FUNCTION TABLE
INPUTS
OUTPUT
MODE
OEAB
OEBY
OUTPUT
MODE
L
H
Z
Isolation
H
H
A data to B bus
True driver
L
L
B data to Y bus
True driver
H
L
A data to B bus, B data to Y bus
True driver with feedback path
GQL PACKAGE
(TOP VIEW)
1
23456
A
B
C
D
E
F
G
H
J
K


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