AMBE2000 Datasheet, PDF (14/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

X2/CLKIN
RESETN
CLKOUT
AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
t_su(INT)
t_su(RS)
t_w(RSL)
t_h(RS)
Figure 3-B Hardware Reset Timing Diagram
Table 3-B Reset Timing Parameters
Reference
t_h(RS)
t_w(RSL)
t_su(RS)
t_su(INT)
Parameter
Hold time, RS after CLKOUT low
Pulse duration, RS low
Setup time, RS before X2/CLKIN low
Setup time, INTn, NMI, RS before CLKOUT low
Min
Max
0
50
5
10
•
CLKOUT is shown for reference only. It should not be connected in the circuit.
Units
ns
µs
ns
ns
3.4 Crystal / Oscillator Usage
The AMBE-2000™ Vocoder Chip has an input clock frequency of 16.384 MHz. Two options are outlined below in providing
this signal. The option used is specified by the CLOCK_MODE pin 51.
The following points should be noted when designing any printed circuit board layout:
• Keep the crystal and external capacitors as close to the CLK_I and CLK_I2
pins as possible to minimize board stray capacitance.
• Keep X2/CLKIN and X1 away from high frequency digital traces (example
CLKOUT) to avoid coupling.
3.4.1 TTL Clock Source
If CLOCK_MODE pin is low then a TTL/CMOS source is used as the clock input. Connect X2/CLKIN and X1 as follows:
page 14
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