Datasheet

32KCLKOUT
CK0 CK1 CK1
032-073
HFCLKOUT
CHO1 CHO2 CHO2
032-074
TPS65950
SWCS032E–OCTOBER 2008–REVISED JANUARY 2011 www.ti.com
Table 12-10. 32KCLKOUT Output Clock Switching Characteristics (continued)
Name Parameter Description Min Typ Max Unit
CK2 t
R(32KCLKOUT)
Rise time, 32KCLKOUT
(1)
16 ns
CK3 t
F(32KCLKOUT)
Fall time, 32KCLKOUT
(1)
16 ns
(1) The output capacitive load is 30 pF.
Figure 12-12. 32KCLKOUT Output Clock
12.3.2 HFCLKOUT Output Clock
Table 12-11 lists the electrical characteristics of the HFCLKOUT output clock.
Table 12-11. HFCLKOUT Output Clock Electrical Characteristics
Name Parameter Description Min Typ Max Unit
f Frequency 19.2, 26, or 38.4 MHz
C
L
Load capacitance 30 pF
V
OUT
Output clock voltage, depending on output reference level IO_1P8 (see Section 2) 1.8
(1)
V
V
OH
Voltage output high V
OUT
– 0.45 V
OUT
V
V
OL
Voltage output low 0 0.45 V
(1) The output voltage depends on output reference level, which is IO_1P8 (see Section 2).
Table 12-12 lists the timing characteristics of the HFCLKOUT output clock.
Table 12-12. HFCLKOUT Output Clock Switching Characteristics
Name Parameter Description Min Typ Max Unit
CHO1 1/t
C(HFCLKOUT)
Frequency 19.2, 26, or 38.4 MHz
CHO2 t
W(HFCLKOUT)
Pulse duration, HFCLKOUT low or high 0.40*t
C(HFCLKOUT)
0.60*t
C(HFCLKOUT)
ns
CHO3 t
R(HFCLKOUT)
Rise time, HFCLKOUT
(1)
2.6 ns
CHO4 t
F(HFCLKOUT)
Fall time, HFCLKOUT
(1)
2.6 ns
(1) The output capacitive load is 30 pF.
Figure 12-13 shows the waveform of the HFCLKOUT output clock.
Figure 12-13. HFCLKOUT Output Clock
142 Clock Specifications Copyright © 2008–2011, Texas Instruments Incorporated
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