Output Enable Time Output pins are considered to be enabled when they have made a transition from a high impedance state" />
參數(shù)資料
型號(hào): ADSP-21991BSTZ
廠商: Analog Devices Inc
文件頁(yè)數(shù): 30/44頁(yè)
文件大?。?/td> 0K
描述: IC DSP CONTROLLER 16BIT 176-LQFP
產(chǎn)品變化通告: Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝: 1
系列: ADSP-21xx
類型: 定點(diǎn)
接口: SPI,SSP
時(shí)鐘速率: 160MHz
非易失內(nèi)存: 外部
芯片上RAM: 112kB
電壓 - 輸入/輸出: 3.30V
電壓 - 核心: 2.50V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 176-LQFP
供應(yīng)商設(shè)備封裝: 176-LQFP(24x24)
包裝: 托盤(pán)
ADSP-21991
–36–
REV. 0
Output Enable Time
Output pins are considered to be enabled when they have made
a transition from a high impedance state to when they start
driving. The output enable time tENA is the interval from when a
reference signal reaches a high or low voltage level to when the
output has reached a specified high or low trip point, as shown
in the Output Enable/Disable diagram (Figure 18). 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
V to be the difference between the output
voltage of the ADSP-21991 and the input threshold for the device
requiring the hold time. A typical
V will be 0.4 V. CLis 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).
Pin Configurations
Table 16 identifies the signal for each Mini-BGA ball number.
Table 17 identifies the Mini-BGA ball number for each signal
name.
Table 18 identifies the signal for each LQFP lead.
Table 19 identifies the LQFP lead for each signal name.
Table 4 describes each signal.
Figure 19. Equivalent Device Loading for AC
Measurements (Includes All Fixtures)
Figure 20. Voltage Reference Levels for AC
Measurements (Except Output Enable/Disable)
1.5V
50pF
TO
OUTPUT
PIN
IOL
IOH
INPUT
OR
OUTPUT
1.5V
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