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參數(shù)資料
| 型號： | SMJ320C26FJ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | 16-BIT, 40 MHz, OTHER DSP, CQCC68 |
| 封裝： | CERAMIC, LCC-68 |
| 文件頁數(shù)： | 14/40頁 |
| 文件大小： | 577K |
| 代理商： | SMJ320C26FJ |
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SMJ320C26
DIGITAL SIGNAL PROCESSOR
SGUS 016A – AUGUST 1990 – REVISED AUGUST 2001
21
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
CLOCK CHARACTERISTICS AND TIMING
The SMJ320C26 can use either its internal oscillator or an external frequency source for a clock.
internal clock option
The internal oscillator is enabled by connecting a crystal across X1 and X2/CLKIN (see Figure 2). The frequency
of CLKOUT1 is one-fourth the crystal fundamental frequency. The crystal should be either fundamental or
overtone mode, and parallel resonant, with an effective series resistance of 30
, a power dissipation of
1 mW, and be specified at a load capacitance of 20 pF. Note that overtone crystals require an additional tuned
LC circuit (see the application report, Hardware Interfacing to the TMS320C25).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
fx Input clock frequency
TA = – 55°C MIN
6.7
40.0
MHz
C1, C2
TC = 125°C MAX
10
pF
This parameter is not production tested.
X1
X2/CLKIN
CRYSTAL
C2
C1
Figure 1. Internal Clock Option
external clock option
An external frequency source can be used by injecting the frequency directly into X2/CLKIN with X1 left
unconnected. The external frequency injected must conform to the specifications listed in the table below.
switching characteristics over recommended operating conditions (see Note 1)
PARAMETER
MIN
TYP
MAX
UNIT
tc(C)
CLKOUT1/CLKOUT2 cycle time
100
600
ns
td(CIH-C)
CLKIN high to CLKOUT1/CLKOUT2/STRB high/low
5
32
ns
tf(C)
CLKOUT1/CLKOUT2/STRB fall time
5
ns
tr(C)
CLKOUT1/CLKOUT2/STRB rise time
5
ns
tw(CL)
CLKOUT1/CLKOUT2 low pulse duration
2Q – 8
2Q
2Q + 8
ns
tw(CH)
CLKOUT1/CLKOUT2 high pulse duration
2Q – 8
2Q
2Q + 8
ns
td(C1-C2)
CLKOUT1 high to CLKOUT2 low, CLKOUT2 high to CLKOUT1 high, etc.
Q – 6
Q
Q+6
ns
This parameter is not production tested.
NOTE 1: Q = 1/4tc(C)
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| SMJ320C30GBM40 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC Digital Signal Proc RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
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