參數(shù)資料
型號(hào)： SM320C25-50FJM
廠商： TEXAS INSTRUMENTS INC
元件分類： 數(shù)字信號(hào)處理
英文描述： 16-BIT, 50 MHz, OTHER DSP, CQCC68
封裝： CERAMIC, MS-004, LCC-68
文件頁(yè)數(shù)： 10/40頁(yè)
文件大?。?/td> 681K
代理商： SM320C25-50FJM
SMJ320C25, SMJ320C2550
DIGITAL SIGNAL PROCESSOR
SGUS007D – AUGUST 1988 – REVISED OCTOBER 2001
18
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
electrical characteristics over specified free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SMJ320C25,
SMJ320C25-50
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP§
MAX
UNIT
VOH
High-level output voltage
VCC = MIN, IOH = MAX
24
3
V
VOL
Low-level output voltage
VCC = MIN, IOL = MAX
0.3
0.6
V
IZ
Three-state current
VCC = MAX
–20
20
mA
I
Input current
X2/CLKIN
VV
to V
–20
20
A
II
Input current
All other pins
VI = VSS to VCC
–10
10
mA
I
S ppl c rrent
Normal
V
MAX f
MAX
185
mA
ICC
Supply current
Idle/R5L5
VCC = MAX, fx = MAX
100
mA
Ci
Input capacitance
15
pF
Co
Output capacitance
15
pF
§ All typical values are at VCC = 5 V, TA = 25°C
CLOCK CHARACTERISTICS AND TIMING
The SMJ320C25 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 of crystals require an additional tuned LC
circuit (see the application report, Hardware Interfacing to the TMS320C25).
PARAMETER
TEST CONDITIONS
SMJ320C25-50
SMJ320C25
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNIT
fx
Input clock frequency
TA = – 55°C MIN
6.7
50.0
6.7
40.0
MHz
C1, C2
TC = 125°C MAX
10
pF
These values are derived from characterization data and are not tested.
X2/CLKIN
C2
C1
X1
Crystal
Figure 2. Internal Clock Options
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