LMH2190TM-38 NSC [National Semiconductor], LMH2190TM-38 Datasheet - Page 20

• Manufacturer Part Number: LMH2190TM-38
• Description: Quad Channel 27 MHz Clock Tree Driver with I2C Interface
• Manufacturer: NSC [National Semiconductor]

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Field
CLK4 Load
CLK_REQ4 Input Polarity
CLK_REQ4 Force ON Control
CLK_REQ4 Force OFF Control
CLK_REQ4 Pull down Resistor
Reserved
Reserved
Field
Thermal Shutdown (TSD)
CLK_REQ1 Input Value
CLK_REQ2 Input Value
CLK_REQ3 Input Value
CLK_REQ4 Input Value
SCLK_REQ Output Value
Reserved
Reserved
Address = 04H, type = R/W, reset value = 06H, 0000_0110, Bold face settings are the default configuration.
Address = 05H, type = R
Bits
[1-0]
[2]
[3]
[4]
[5]
[6]
[7]
Bits
[0]
[1]
[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 I
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 I
0 - Use the clock request pin to control the output.
1 - Force the clock output to be disabled (Force OFF). ”Force OFF" overrides ”Force
ON".
Selects whether an internal 200 kΩ pull down resistor on the clock request input to GND
is present.
0 - No internal pull down resistor is present.
1 - Internal 200 kΩ pull-down resistor is present.
Description
Indicates if a thermal shutdown event has occurred.
0 - Thermal shutdown has not occurred.
1 - Thermal shutdown has occurred
Captures the state of the generated clock request input value.
0 - Generated clock request is low.
1 - Generated clock request is high.
Captures the state of the generated clock request input value.
0 - Generated clock request is low.
1 - Generated clock request is high.
Captures the state of the generated clock request input value.
0 - Generated clock request is low.
1 - Generated clock request is high.
Captures the state of the generated clock request input value.
0 - Generated clock request is low.
1 - Generated clock request is high.
Captures the state of the system clock request output value.
0 - System clock request is low.
1 - System clock request is high.
TABLE 6. CLK4 Output Register
TABLE 7. Status Register
20
2
2
C logic to enable the output.
C logic to disable the output.