T9000
Preliminary Data Sheet
November 2000
ISDN Network Termination Node (NTN) Device
4 Pin Information (continued)
Table 8. Miscellaneous Pins (2)
Pin Name Pin #
Type*
Pin Description
RESET
31
Id
Reset Input (Active-High). This signal resets the entire device. During RESET,
the U transmitter produces 0 V. This puts the U-interface in the QUIET mainte-
nance mode as described in ANSI T1.601 Section 6.5. RESET should be
asserted whenever return loss and longitudinal balance measurements are being
made on the U-interface. Internal 50 kΩ pull-down.
TEST
43
Id
Test Input (Active-High). During normal operation, this signal should be main-
tained high. Internal 50 kΩ pull-down. Please see Section 15, Test Mode for more
details.
* I = input, O = output, Id = input with an internal 50 kΩ pull-down.
Table 9. Oscillator Pins (2)
Pin Name Pin #
Type*
Pin Description
XTAL1
37
I
Crystal In. 15.36 MHz oscillator input. When using an external crystal, one of the
crystal pins is connected to this pin. This pin may also be driven by an external
oscillator with CMOS output levels.
XTAL0
38
O
Crystal Out. 15.36 MHz oscillator output. When using an external crystal, one of
the crystal pins is connected to this pin. When using an external oscillator, this
pin is left unconnected.
* I = input, O = output.
Table 10. Power and Ground Pins
Pin Name
VDDD
Pin #
Type
—
Pin Description
3, 22, 39, 80
Digital Power. 5 V ± 5% power supply pins for digital circuitry.
Digital Ground. Ground leads for digital circuitry.
GNDD
12, 25, 36, 44, 69,
89, 98
—
VDDA
53, 57, 67
52, 59, 66
—
—
Analog Power. 5 V ± 5% power supply lead for the analog circuitry.
Analog Ground. Ground leads for analog circuitry.
GNDA
14
Lucent Technologies Inc.
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