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參數資料
型號: ADSP-21990
廠商: Analog Devices, Inc.
元件分類: 數字信號處理
英文描述: 16-bit fixed point DSP with Flash
中文描述: 具有閃存的 16 位定點 DSP
文件頁數: 35/44頁
文件大小: 574K
代理商: ADSP-21990
–35–
REV. 0
ADSP-21990
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 t
ENA
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 t
DECAY
using the equation at
Output Disable Time
on Page 34
. Choose
V to be the difference between the ADSP-
21990 output voltage and the input threshold for the device
requiring the hold time. A typical
V will be 0.4 V. C
L
is the total
bus capacitance (per data line), and I
L
is the total leakage or three-
state current (per data line). The hold time will be t
DECAY
plus the
minimum disable time (i.e., t
DATRWH
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 pin name.
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
I
OL
I
OH
INPUT
OR
OUTPUT
1.5V
1.5V
相關PDF資料
PDF描述
ADSP-21990BBC 16-bit fixed point DSP with Flash
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相關代理商/技術參數
參數描述
ADSP-21990BBC 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 150MHz 150MIPS 196-Pin Mini-BGA 制造商:Rochester Electronics LLC 功能描述:160 MIPS, MIXED SIGNAL DSPWITH 14-BIT - Bulk
ADSP-21990BST 制造商:Rochester Electronics LLC 功能描述:160 MIPS,MIXED SIGNAL DSP WITH 14BIT - Tape and Reel
ADSP-21990BSTZ 功能描述:IC DSP CONTROLLER 16BIT 176-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - DSP(數字式信號處理器) 系列:ADSP-21xx 標準包裝:2 系列:StarCore 類型:SC140 內核 接口:DSI,以太網,RS-232 時鐘速率:400MHz 非易失內存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA,FCBGA 供應商設備封裝:431-FCPBGA(20x20) 包裝:托盤
ADSP-21991BBC 制造商:Analog Devices 功能描述:DSP Fixed-Point 16-Bit 150MHz 150MIPS 196-Pin Mini-BGA
ADSP-21991BBCZ 功能描述:IC DSP CTLR 16BIT 196CSPBGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - DSP(數字式信號處理器) 系列:ADSP-21xx 標準包裝:2 系列:StarCore 類型:SC140 內核 接口:DSI,以太網,RS-232 時鐘速率:400MHz 非易失內存:外部 芯片上RAM:1.436MB 電壓 - 輸入/輸出:3.30V 電壓 - 核心:1.20V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:431-BFBGA,FCBGA 供應商設備封裝:431-FCPBGA(20x20) 包裝:托盤
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