73M2921 datasheet(3/41 Pages) ETC

3 / 41 page

73M2921

Advanced Single

Chip Modem

February 99 Rev M

TDK Semiconductor

Page 3 of 41

PIN DESCRIPTION

POWER

NAME

TYPE

DESCRIPTION

VPD

3, 23,

51, 82

DIGITAL POWER: Positive Digital Power.

VND

4, 20,

52, 74

DIGITAL POWER: Negative Digital Power.

VPA

29, 36

ANALOG POWER: Positive Analog Power.

VNA

27, 37

ANALOG POWER: Negative Analog Power.

VREF

VREF: Analog voltage reference for biasing of off chip analog function.

Maximum output current is +/- 20

µA.

VBG

BANDGAP VOLTAGE: Bandgap voltage pin used as a connection point

for an external capacitor for noise reduction only.

CLOCKS AND RESETS

NAME

TYPE

DESCRIPTION

XTALI

CRYSTAL INPUT: Onboard crystal oscillator input, or the master clock

input to the 73M2921 if the crystal oscillator is not used.

XTALO

CRYSTAL OUTPUT: Onboard crystal oscillator output should be left

unconnected if the crystal oscillator on the 73M2921 is not used. Along

with XTALI and proper loading capacitors, these pins include an inverter

for use with parallel resonant mode crystals.

MICCLK

MICROCONTROLLER CLOCK: Programmable clock output for use

when the system oscillator is on the 73M2921. May be used to drive the

system controller. The output frequency is controlled by CR0 bits D11-

D9 (MCLK [2:0]).

RESET

MASTER CHIP RESET: Active High Input with hysteresis. Resets the

73M2921 and the control registers. If not used as a reset source, this

pin must be tied low.

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