SMJ320C25GBM Datasheet, PDF (18/38 Pages) Texas Instruments – DIGITAL SIGNAL PROCESSOR

SMJ320C25, SMJ320C25Ć50
DIGITAL SIGNAL PROCESSOR
SGUS007D – AUGUST 1988 – REVISED OCTOBER 2001
electrical characteristics over specified free-air temperature range (unless otherwise noted)
PARAMETER
VOH
VOL
IZ
II
High-level output voltage
Low-level output voltage
Three-state current
Input current
X2/CLKIN
All other pins
ICC
Supply current
Normal
Idle/R5L5
Ci
Input capacitance
Co
Output capacitance
§ _{All typical values are at VCC = 5 V, TA = 25°C}
TEST CONDITIONS
VCC = MIN, IOH = MAX
VCC = MIN, IOL = MAX
VCC = MAX
VI = VSS to VCC
VCC = MAX, fx = MAX
SMJ320C25,
SMJ320C25-50
MIN TYP^§ MAX
24
3
0.3 0.6
–20
20
–20
20
–10
10
185
100
15
15
UNIT
V
V
mA
mA
mA
pF
pF
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 Ω, 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
fx
Input clock frequency
TA = – 55°C MIN
C1, C2
TC = 125°C MAX
† _{These values are derived from characterization data and are not tested.}
SMJ320C25-50
MIN TYP MAX
6.7^†
50.0
10
SMJ320C25
MIN TYP MAX
6.7^†
40.0
10
UNIT
MHz
pF
X1
X2/CLKIN
Crystal
C1
C2
Figure 2. Internal Clock Options
18
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