参数资料
型号: ADSP-21261SKSTZ150
厂商: Analog Devices Inc
文件页数: 31/44页
文件大小: 0K
描述: IC DSP 32BIT 150MHZ 144LQFP
产品培训模块: SHARC Processor Overview
标准包装: 60
系列: SHARC®
类型: 浮点
接口: DAI,SPI
时钟速率: 150MHz
非易失内存: ROM(384 kB)
芯片上RAM: 128kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.20V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
ADSP-21261
Rev. 0
|
Page 37 of 44
|
March 2006
OUTPUT DRIVE CURRENTS
Figure 28 shows typical I-V characteristics for the output driv-
ers of the ADSP-21261. The curves represent the current drive
capability of the output drivers as a function of output voltage.
TEST CONDITIONS
The ac signal specifications (timing parameters) appear in
output disable time, output enable time, and capacitive loading.
Timing is measured on signals when they cross the 1.5 V level as
described in Figure 30. All delays (in nanoseconds) are mea-
sured between the point that the first signal reaches 1.5 V and
the point that the second signal reaches 1.5 V.
CAPACITIVE LOADING
Output delays and holds are based on standard capacitive loads:
30 pF on all pins (see Figure 29). Figure 33 shows graphically
how output delays and holds vary with load capacitance. The
graphs of Figure 31, Figure 32, and Figure 33 may not be linear
outside the ranges shown for Typical Output Delay vs. Load
Capacitance and Typical Output Rise Time (20%–80%, V =
Min) vs. Load Capacitance.
Figure 28. ADSP-21261 Typical Drive
Figure 29. Equivalent Device Loading for AC Measurements
(Includes All Fixtures)
Figure 30. Voltage Reference Levels for AC Measurements
SWEEP (VDDEXT) VOLTAGE (V)
–20
03.5
0.5
1.0
1.5
2
2.5
3.0
0
–40
–30
20
40
–10
S
O
U
R
C
E
(V
D
E
X
T
)
C
U
R
E
N
T
(m
A
)
VOL
3.11V, 70°C
3.3V, 25°C
3.47V, 0°C
VOH
30
10
3.11V, 70°C
3.3V, 25°C
3.47V, 0°C
1.5V
30pF
TO
OUTPUT
PIN
50
INPUT
OR
OUTPUT
1.5V
Figure 31. Typical Output Rise/Fall Time
(20% to 80%, VDDEXT = Max)
Figure 32. Typical Output Rise/Fall Time
(20% to 80%, VDDEXT = Min)
LOAD CAPACITANCE (pF)
8
0
120
40
100
12
4
2
10
6
R
IS
E
A
N
D
F
A
L
T
IM
E
S
(n
s
)
y = 0.0722x + 1.4042
80
60
20
RISE
FALL
y = 0.0904x + 1.9426
LOAD CAPACITANCE (pF)
12
0120
20
40
60
80
100
10
8
6
4
R
IS
E
A
N
D
F
A
L
T
IM
E
S
(n
s
)
2
0
y = 0.0915x + 2.2207
y = 0.0728x +1.6336
RISE
FALL
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