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Signal Name:
Signal Description:
Signal Type:
Analog line driver outputs. These pins connect via a step–up transformer to the E1 line. See Section 0 for
details.
4.1.7 Supply Pins
Signal Name:
Signal Description:
Signal Type:
5.0 volts +/-5% (DS21554) or 3.3 volts +/-5% (DS21354). Should be tied to the RVDD and TVDD pins.
Signal Name:
Signal Description:
Signal Type:
5.0 volts +/-5% (DS21554) or 3.3 volts +/-5% (DS21354). Should be tied to the DVDD and TVDD pins.
Signal Name:
Signal Description:
Signal Type:
5.0 volts +/-5% (DS21554) or 3.3 volts +/-5% (DS21354). Should be tied to the RVDD and DVDD pins.
Signal Name:
Signal Description:
Signal Type:
0.0 volts. Should be tied to the RVSS and TVSS pins.
Signal Name:
Signal Description:
Signal Type:
0.0 volts. Should be tied to DVSS and TVSS.
Signal Name:
Signal Description:
Signal Type:
0.0 volts. Should be tied to DVSS and RVSS.
5 PARALLEL PORT
The DS21354/554 is controlled via either a non–multiplexed (MUX = 0) or a multiplexed (MUX = 1) bus
by an external microcontroller or microprocessor. The device can operate with either Intel or Motorola
bus timing configurations. If the BTS pin is tied low, Intel timing will be selected; if tied high, Motorola
timing will be selected. All Motorola bus signals are listed in parenthesis (). See the timing diagrams in
the A.C. Electrical Characteristics in Section 21 for more details.
TTIP & TRING
Transmit Tip and Ring
Output
DVDD
Digital Positive Supply
Supply
RVDD
Receive Analog Positive Supply
Supply
TVDD
Transmit Analog Positive Supply
Supply
DVSS
Digital Signal Ground
Supply
RVSS
Receive Analog Signal Ground
Supply
TVSS
Transmit Analog Signal Ground
Supply
24 of 117
DS21354 & DS21554
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