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DSP56166 Datasheet(PDF) 22 Page - Motorola, Inc |
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DSP56166 Datasheet(HTML) 22 Page - Motorola, Inc |
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22 / 63 page  PRELIMINARY - 6/15/93 MOTOROLA DSP56166 Technical Data Sheet 12 AC Electrical Characteristics (VSS = 0 Vdc) 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, MODB and MODC. These five 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 re- spective input signal’s transition. The DSP56166 output levels are measured with the production test ma- chine VOL and VOH reference levels set at 0.8 V and 2.0 V respectively. AC Electrical Characteristics — Clock Operation Timing The system clock to the DSP56166 must be externally supplied to EXTAL. Notes: 1. Rise and Fall time may be relaxed to 12 ns maximum if the EXTAL input frequency is less than or equal to 20MHz. If the EXTAL input frequency is between 20MHz and 40MHz, Rise and Fall time should be 4 ns maximum. If the EXTAL input frequency is between 40MHz and 60MHz, Rise and Fall time should meet the specified values in the 40MHz column (3 ns maximum). 2. The duty cycle may be relaxed to 43-57% if the EXTAL input frequency is less than or equal to 20MHz. If the EXTAL input frequency is between 20MHz and 40MHz, the duty cycle should be such that Th and Tl meet 12 ns minimum . If the EXTAL input frequency is between 40MHz and 60MHz, the duty cycle should be such that Th and Tl meet the specified values in the 60MHz column (8 ns minimum) . 3. T = Icyc / 4 is used in the electrical characteristics. The exact length of each T is affected by the duty cycle of the external clock input. 4. Duty cycles and EXTAL widths are measured at the EXTAL input signal midpoint when AC coupled and at Vdd/2 when not AC coupled. Num Characteristics Sym 60MHz Unit Min Max 1 Frequency of Operation (EXTAL) f 0 60 MHz 2 Instruction Cycle Time =2Tc Icyc 33 ∞ ns 3 Wait State =Tc =2T WS 16.6 ∞ ns 4 EXTAL Cycle Period Tc 16.6 ∞ ns 5 EXTAL Rise Time (see Note 1) — 3 ns 6 EXTAL Fall Time (see Note 1) — 3 ns 7 EXTAL Width High (see Note 2, 3, 4) 48-52% duty cycle Th 8 ∞ ns 8 EXTAL Width Low (see Note 2, 3, 4) 48%-52% duty cycle Tl 8 ∞ ns EXTAL VIHC Midpoint 7 8 4 2 5 6 Th Tl 90% 10% VILC |
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