ADSP-2192M 查看數據表（PDF） - Analog Devices

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ADSP-2192M

DSP Microcomputer

Analog Devices 

ADSP-2192M

REFERENCE

SIGNAL

tDIS

VOH (MEASURED)

VOL (MEASURED)

tMEASURED

tENA

VOH (MEASURED) – ⌬V 2.0V

VOL (MEASURED) + ⌬V 1.0V

tDECAY

OUTPUT STOPS

DRIVING

OUTPUT STARTS

DRIVING

HIGH IMPEDANCE STATE.

TEST CONDITIONS CAUSE THIS VOLTAGE

TO BE APPROXIMATELY 1.5V

Figure 17. Output Enable/Disable

IOL

TO

OUTPUT

PIN

50pF

1.5V

IOH

Figure 18. Equivalent Device Loading for AC

Measurements (Includes All Fixtures)

INPUT

OR

OUTPUT

1.5V

1.5V

Figure 19. Voltage Reference Levels for AC

Measurements (Except Output Enable/Disable)

output has reached a specified high or low trip point, as shown

in the Output Enable/Disable diagram (Figure 17). If multiple

pins (such as the data bus) are enabled, the measurement value

is that of the first pin to start driving.

Example System Hold Time Calculation

To determine the data output hold time in a particular system,

first calculate tDECAY using the equation at Output Disable Time

on Page 34. Choose ∆V to be the difference between the ADSP-

2192M’s output voltage and the input threshold for the device

requiring the hold time. A typical ∆V will be 0.4 V. CL is the total

bus capacitance (per data line), and IL is the total leakage or three-

state current (per data line). The hold time will be tDECAY plus the

minimum disable time (i.e., tDATRWH for the write cycle).

Capacitive Loading

Output delays and holds are based on standard capacitive loads:

50 pF on all pins. The delay and hold specifications given should

be derated for loads other than the nominal value of 50 pF.

Environmental Conditions

The thermal characteristics in which the DSP is operating

influence performance (see Table 38).

Table 38. Thermal Characteristics

Rating Description

Thermal Resistance

(Junction-to-Ambient)

Symbol

θJA

LQFP

33.79°C/W

Still Air

REV. 0

–35–

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