isd-t360sb ETC-unknow, isd-t360sb Datasheet - Page 12

• Manufacturer Part Number: isd-t360sb
• Manufacturer: ETC-unknow

ISD-T360SB
Figure 1-3: External Clock Source
Crystal Oscillator
A crystal oscillator is connected to the on-chip os-
cillator circuit via the X1 and X2 signals, as shown
in Figure 1-4.
Figure 1-4: Connections for an External
Keep stray capacitance and inductance, in the
oscillator circuit, as low as possible. The crystal res-
onator, and the external components, should be
as close to the X1 and X2/CLKIN pins as possible,
to keep the trace lengths in the printed circuit to
an absolute minimum.
You can use crystal oscillators with maximum load
capacitance of 20 pF, although the oscillation
frequency may differ from the crystal’s specified
value.
1-4
VoiceDSP
C2
X1
X2
Clock Generator
Crystal Oscillator
X2/CLKIN
R1
ISD-T360
Single-phase Clock Signal
crystal
X1
C1
Table 1-2 lists the components in the crystal oscil-
lator circuit
Table 1-2:
1.2.3
Power-down mode is useful during a power failure
or in a power-saving model, when the power
source for the processor is a backup battery or in
battery-powered devices, while the processor is in
idle mode.
In power-down mode, the clock frequency of the
VoiceDSP processor is reduced and some of the
processor modules are deactivated. As a result,
the ISD-T360SB consumes considerably less power
than in normal-power mode. Although the
VoiceDSP processor does not perform all its usual
functions in power-down mode, it does retain
stored messages and maintain the date and
time.
NOTE
The ISD-T360SB stores messages and all memory
management information in Flash memory.
When Flash memory is used for memory manage-
ment, power does not need to be maintained to
the processor to preserve stored messages.
To keep power consumption low during power-
down mode, the RESET, MWCS, MWCLK and MW-
DIN signals should be held above V
below V
Crystal Resonator
Resistor R1
Capacitors C1, C2
Component
SS
In power-down mode all the chip select
signals, CS0 to CS3, are set to 1. To guar-
antee that there is no current flow from
these signals to the Flash devices, the
power supply to these devices must not
be disconnected.
POWER-DOWN MODE
+ 0.5 V.
Components of Crystal Oscillator
Circuit
4.096 MHz
10 MW
33 pF
Values
Voice Solutions in Silicon
50 PPM
5%
20%
1—HARDWARE
Tolerance
CC
– 0.5 V or
™