74LCX646MTCX Fairchild Semiconductor, 74LCX646MTCX Datasheet - Page 3

• Manufacturer Part Number: 74LCX646MTCX
• Description: IC TRANSCVR/REGISTER 8B 24TSSOP
• Manufacturer: Fairchild Semiconductor
• Series: 74LCXr

Specifications of 74LCX646MTCX

• Logic Type: Registered Transceiver, Non-Inverting
• Number Of Elements: 1
• Number Of Bits Per Element: 8
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Functional Description
In the transceiver mode, data present at the HIGH imped-
ance port may be stored in either the A or B register or
both. The select (SAB, SBA) controls can multiplex stored
and real-time. The examples shown below demonstrate the
four fundamental bus-management functions that can be
performed.
OE
L
L
OE DIR CPAB CPBA SAB SBA
L
DIR
H
L
L
Real-Time Transfer
Transfer Storage
Bus B to Bus A
Data to A or B
CPAB CPBA
H or L
X
X
H or L
X
X
X
SAB
H
X
L
SBA
H
X
3
The direction control (DIR) determines which bus will
receive data when OE is LOW. In the isolation mode (OE
HIGH), A data may be stored in one register and/or B data
may be stored in the other register. When an output func-
tion is disabled, the input function is still enabled and may
be used to store and transmit data. Only one of the two
busses, A or B, may be driven at a time.
OE
OE
H
H
L
L
L
DIR
DIR
H
H
X
X
L
Real-Time Transfer
Bus A to Bus B
CPAB CPBA
CPAB CPBA


Storage
X
X
X


X
X
X
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SAB
SAB
X
X
X
L
L
SBA
SBA
X
X
X
X
L