参数资料
型号: ADSP-21375BSWZ-2B
厂商: Analog Devices Inc
文件页数: 49/56页
文件大小: 0K
描述: IC DSP 32BIT 266MHZ 208-MQFP
产品培训模块: SHARC Processor Overview
标准包装: 36
系列: SHARC®
类型: 浮点
接口: DAI,DPI
时钟速率: 266MHz
非易失内存: ROM(256 kB)
芯片上RAM: 64kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.20V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 208-LQFP 裸露焊盘
供应商设备封装: 208-LQFP-EP(28x28)
包装: 托盘
OUTPUT DRIVE CURRENTS
Figure 36 shows typical I-V characteristics for the output driv-
ers of the processors. The curves represent the current drive
capability of the output drivers as a function of output voltage.
40
CAPACITIVE LOADING
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see Figure 37 ). Figure 41 shows graphically
how output delays and holds vary with load capacitance. The
graphs of Figure 39 , Figure 40 , and Figure 41 may not be linear
outside the ranges shown for Typical Output Delay vs. Load
Capacitance and Typical Output Rise Time (20% to 80%,
3 0
20
V OH
3 . 3 V, 25°C
3 .47V, -45°C
V = Min) vs. Load Capacitance.
12
10
3 .11V, 125°C
0
- 10
10
8
y = 0.0467x + 1.6323
RISE
FALL
3 .11V, 125°C
- 20
3 . 3 V, 25°C
6
- 3 0
V OL
- 40
3 .47V, -45°C
4
y = 0.045x + 1.524
0
0.5
1.0 1.5 2.0 2.5
3 .0
3 .5
S WEEP (V DDEXT ) VOLTAGE (V)
Figure 36. Typical Drive at Junction Temperature
2
0
0
50
100
150
200
250
TEST CONDITIONS
The ac signal specifications (timing parameters) appear in
Table 15 on Page 22 through Table 41 on Page 48 . These include
output disable time, output enable time, and capacitive loading.
The timing specifications for the SHARC apply for the voltage
reference levels in Figure 37 .
Timing is measured on signals when they cross the 1.5 V level as
LOAD CAPACITANCE (pF)
Figure 39. Typical Output Rise/Fall Time (20% to 80%,
V DDEXT = Max)
12
described in Figure 38 . All delays (in nanoseconds) are mea-
10
RI S E
sured between the point that the first signal reaches 1.5 V and
the point that the second signal reaches 1.5 V.
8
y = 0.049x + 1.5105
FALL
6
y = 0.04 8 2x + 1.4604
TO
OUTPUT
PIN
30pF
V LOAD
4
2
0
0
50
100
150
200
250
Figure 37. Equivalent Device Loading for AC Measurements
(Includes All Fixtures)
LOAD CAPACITANCE (pF)
Figure 40. Typical Output Rise/Fall Time (20% to 80%,
V DDEXT = Min)
INPUT
OR
1.5V
1.5V
OUTPUT
Figure 38. Voltage Reference Levels for AC Measurements
Rev. D | Page 49 of 56 | April 2013
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