T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
4 Pin Information (continued)
Table 1. S/T-Interface Pins (6)
Pin Name Pin # Type
Pin Description
CSENS
58
—
I
Current Sense. Connect an 11.5 kΩ, 1%, resistor from this pin to GNDA.
FT
71
Fixed Timing Control. Upon exiting from RESET, the state of this pin is sampled
internally and written to register SCR0[FT] to control whether the S-block receiver
uses fixed or adaptive timing (note that the 80C32 is free to overwrite register bit
SCR0[FT] subsequent to this). Internal 50 kΩ pull-down.
0: Adaptive Timing. Incoming data at S/T-interface is sampled at a point defined by
an adaptive timing algorithm.
1: Fixed Timing. Incoming data at the S/T-interface is sampled with a fixed delay
relative to the S/T transmitter clock.
TPR
TNR
RPR
RNR
54
51
55
56
O
O
I
Transmit Positive Rail for S/T-Interface. Positive output of S/T-interface analog
transmitter. Connect to transformer through a 121 Ω, 1% resistor.
Transmit Negative Rail for S/T-Interface. Negative output of S/T-interface analog
transmitter. Connect to transformer through a 121 Ω, 1% resistor.
Receive Positive Rail for S/T-Interface. Positive input of S/T-interface analog
receiver. Connect to transformer through a 10 kΩ, 10% resistor.
I
Receive Negative Rail for S/T-Interface. Negative input of S/T-interface analog
receiver. Connect to transformer through a 10 kΩ, 10% resistor.
Table 2. U-Interface Pins (7)
Pin Name Pin # Type
Pin Description
LOP
68
65
61
60
62
64
63
O
O
—
—
—
I
Line Driver Positive Output for U-Interface. Connect to U-interface transformer
through a 16.9 Ω, 1% resistor.
LON
Line Driver Negative Output for U-Interface. Connect to U-interface transformer
through a 16.9 Ω, 1% resistor.
VRP
Positive Voltage Reference for U-Interface Circuits. Connect a 0.1 µF, 20% capac-
itor to GNDA (as close to the device pins as possible).
VRN
Negative Voltage Reference for U-Interface Circuits. Connect a 0.1 µF, 20%
capacitor to GNDA (as close to the device pins as possible).
VRCM
SDINN
SDINP
Common-Mode Voltage Reference for U-Interface Circuits. Connect a 0.1 µF,
20% capacitor to GNDA (as close to the device pins as possible).
Sigma-Delta A/D Negative Input for U-Interface. Connect via an 820 pF, 20%
capacitor to SDINP.
I
Sigma-Delta A/D Positive Input for U-Interface. Connect via an 820 pF, 20%
capacitor to SDINN.
8
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
