DSP56001 View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
DSP56001 Datasheet PDF : 64 Pages
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DSP56001 Electrical Characteristics
AC Electrical Characteristics
The timing waveforms in the AC Electrical Characteristics are tested with a VIL maximum of 0.5 V and a VIH minimum of 2.4 V for
all pins, except EXTAL, RESET, MODA, and MODB. These four pins are tested using the input levels set forth in the DC Electrical
Characteristics. AC timing specifications which are referenced to a device input signal are measured in production with respect to the
50% point of the respective input signal’s transition. DSP56001 output levels are measured with the production test machine VOL and
VOH reference levels set at 0.8 V and 2.0 V respectively.
AC Electrical Characteristics - Clock Operation
The DSP56001 system clock may be derived from the on-chip crystal oscillator as shown in Clock Figure 1, or it may be externally
supplied. An externally supplied square wave voltage source should be connected to EXTAL, leaving XTAL physically unconnected
(see Clock Figure 2) to the board or socket. The rise and fall time of this external clock should be 5 ns maximum.
Num
Characteristics
Frequency of Operation (EXTAL Pin)
1 External Clock Input High (tch) —
EXTAL Pin
(see Note 1 and 2)
2 External Clock Input Low (tcl) —
EXTAL Pin
(see Note 1 and 2)
3 Clock Cycle Time = cyc = 2T
4 Instruction Cycle Time = Icyc = 4T
20.5 MHz
Min
Max
4.0
20.5
22
150
22
150
48.75
250
97.5
500
27 MHz
Min
Max
4.0
27.0
17
150
33 MHz
Min
Max
4.0
33.0
13.5
150
Unit
MHz
ns
17
150
13.5
150
ns
37
250
30.33
250
ns
74
500
60
500
ns
Notes:
1. External Clock Input High and External Clock Input Low are measured at 50% of the
input transition. tch and tcl are dependent on the duty cycle.
2. T = Icyc / 4 is used in the electrical characteristics. T represents an average which is
independent of the duty cycle.
DSP56001
MOTOROLA
9
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