Texas Instruments Hercules TMS570LS04x/03x LaunchPad Evaluation Kit LAUNCHXL-TMS57004 LAUNCHXL-TMS57004 数据表
产品代码
LAUNCHXL-TMS57004
V
CCIO
V
IH
V
IH
V
IL
0
Input
t
pw
V
IL
SPNS186A – OCTOBER 2012 – REVISED SEPTEMBER 2013
Table 3-2. Output Buffer Drive Strengths (continued)
Low-level Output Current,
I
OL
for V
I
=V
OLmax
or
Signals
High-level Output Current,
I
OH
for V
I
=V
OHmin
ECLK,
selectable 8mA / 2mA
SPI2CLK, SPI2SIMO, SPI2SOMI
The default output buffer drive strength is 8mA for these signals.
Table 3-3. Selectable 8ma/2ma Control
Signal
Control Bit
Address
8mA
2mA
ECLK
SYSPC10[0]
0xFFFF FF78
0
1
SPI2CLK
SPI2PC9[9]
(1)
0xFFF7 F668
0
1
SPI2SIMO
SPI2PC9[10]
(1)
0xFFF7 F668
0
1
SPI2SOMI
SPI2PC9[11]
(1)
0xFFF7 F668
0
1
(1)
Do not do byte or half-word writes to SPI2PC9[31.16] as it may inadvertently change the drive strength of the SPI2 pins
3.8
Input Timings
Figure 3-2. TTL-Level Inputs
Table 3-4. Timing Requirements for Inputs
(1)
Parameter
MIN
MAX
Unit
t
pw
Input minimum pulse width
t
c(VCLK)
+ 10
(2)
ns
(1)
t
c(VCLK)
= peripheral VBUS clock cycle time = 1 / f
(VCLK)
(2)
The timing shown above is only valid for pin used in GIO mode.
3.9
Output Timings
Table 3-5. Switching Characteristics for Output Timings versus Load Capacitance ©
L
)
Parameter
MIN
MAX
Unit
Rise time, t
r
8mA pins
CL = 15 pF
2.5
ns
CL = 50 pF
4
CL = 100 pF
7.2
CL = 150 pF
12.5
Fall time, t
f
CL = 15 pF
2.5
ns
CL = 50 pF
4
CL = 100 pF
7.2
CL = 150 pF
12.5
22
Device Operating Conditions
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