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LMH2190 Datasheet, PDF (23/32 Pages) National Semiconductor (TI) – Quad Channel 27 MHz Clock Tree Driver with I2C Interface | |||
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LMH2190
www.ti.com
Field
CLK_REQ2 Force ON Control
CLK_REQ2 Force OFF Control
CLK_REQ2 Pull down Resistor
Reserved
Reserved
SNAS473H â JUNE 2009 â REVISED MAY 2013
Table 4. CLK2 Output Register(1) (continued)
Bits
Description
[3]
Selects whether to use a clock request or
I2C logic to enable the output.
0 - Use the clock request pin to control
the output.
1 - Force the clock output to be enabled
(Force ON).
[4]
Selects whether to use a clock request or
I2C logic to disable the output.
0 - Use the clock request pin to control
the output.
1 - Force the clock output to be disabled
(Force OFF). âForce OFF" overrides âForce
ON".
[5]
Selects whether an internal 200 k⦠pull
down resistor on the clock request input to
GND is present.
0 - No internal pull down resistor is
present.
1 - Internal 200 k⦠pull-down resistor is
present.
[6]
[7]
Table 5. CLK3 Output Register(1)
Field
CLK3 Load
CLK_REQ3 Input Polarity
CLK_REQ3 Force ON Control
CLK_REQ3 Force OFF Control
CLK_REQ3 Pull down Resistor
Reserved
Reserved
Bits
[1-0]
[2]
[3]
[4]
[5]
[6]
[7]
Description
Sets the drive strength of the clock output
based on the capacitive load.
00 - 10pF to 15pF
01 - 15pF to 22.5pF
10 - 22.5pF to 33.5pF
11 - 33.5pF to 50pF
Sets whether a logic low or high enables the
clock output.
0 - Logic low enables the clock output.
1 - Logic high enables the clock output.
Selects whether to use a clock request or
I2C logic to enable the output.
0 - Use the clock request pin to control
the output.
1 - Force the clock output to be enabled
(Force ON).
Selects whether to use a clock request or
I2C logic to disable the output.
0 - Use the clock request pin to control
the output.
1 - Force the clock output to be disabled
(Force OFF). âForce OFF" overrides âForce
ON".
Selects whether an internal 200 k⦠pull
down resistor on the clock request input to
GND is present.
0 - No internal pull down resistor is
present.
1 - Internal 200 k⦠pull-down resistor is
present.
(1) Address = 03H, type = R/W, reset value = 06H, 0000_0110, Bold face settings are the default configuration.
Copyright © 2009â2013, Texas Instruments Incorporated
Product Folder Links: LMH2190
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