DS3884AVF NSC [National Semiconductor], DS3884AVF Datasheet - Page 5

• Manufacturer Part Number: DS3884AVF
• Description: BTL Handshake Transceiver
• Manufacturer: NSC [National Semiconductor]

B1–B6
B1GND–B6GND
DE
D1–D6
FR1–FR3
GND
LI
NC
PS1, PS2
R1–R6
REXT
QGND
QV
V
Note 12: the multiplicity of grounds reduces the effective inductance of bonding wires and leads, which then reduces the noise caused by transients on the ground
path. The various ground pins can be tied together provided that the external ground has low inductance (i.e., ground plane with power pins and many signal pins
connected to the backplane ground). If the external ground floats considerably during transients, precautionary steps should be taken to prevent QGND from moving
with reference to the backplane ground. The receiver threshold should have the same ground reference as the signal coming from the backplane. A voltage offset
between their grounds will degrade the noise margin.
Note 13: The same considerations for ground are used for V
insertion is not supported, the LI pin can be tied together with QV
Note 14: See AC characteristics for filter setting.
Pin Descriptions
CC
*
CC
Pin Name
Number of
Pins
6
6
1
6
3
3
1
4
2
6
1
2
1
2
CC
in reducing lead inductance (see Note 12). QV
CC
and V
Output
Input/
NA
NA
NA
NA
NA
NA
NA
NA
I/O
O
O
I
I
I
CC
.
5
BTL receiver input and driver output
Driver output ground reduces bounce due to high
current switching of driver outputs
(Note 12)
Driver Enable Low
TTL Driver Input
TTL Filtered Receiver Output
Ground reference for switching circuits.
(Note 12)
Power supply for live insertion. Boards that require live
insertion should connect LI to the live insertion pin on
the connector. (Note 13)
No Connect
Pulse Width Selection pin determines glitch filter setting
(Note 14)
TTL Receiver Output
External Resistor pin. External resistor is used for
internal biasing of filter circuitry. The 13 k
be connected between REXT and GND. The resistor
shall have a tolerance of 1% and a temperature
coefficient of 100 ppm/˚C or better.
Ground reference for receiver input bandgap reference
and non-switching circuits (Note 12)
V
circuits (Note 13)
V
CC
CC
supply for bandgap reference and non-switching
supply for switching circuits (Note 13)
CC
and V
Description
CC
should be tied together externally. If live
resistor shall
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