LMKDB1120FS datasheet(40/133 Pages) TI2

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• Device power supply is on or off

• PWRGD/PWRDN# pin is pulled high or low

• Clock input is valid or invalid

The OE# pins only take effect if all below conditions are met:

1. The clock input is valid

2. The PWRGD/PWRDN# pin is high

3. The device power is up

Otherwise outputs are always muted and OE# assertion and deassertion has no impact.

If OE# pins become low in any of the below conditions:

1. Input clock is invalid

2. PWRGD/PWRDN# pin is low

3. Device power is off

Then when all below conditions are met:

1. The clock input is valid

2. The PWRGD/PWRDN# pin is high

3. The device power is up

Outputs are enabled without any glitch (assuming register OE and SBI OE are active).

8.3.2.3 Clock Input and PWRGD/PWRDN# Behaviors When Device Power is Off

Input clocks can be running, floating, low/low or pulled to VDD when device power is off, regardless of

PWRGD/PWRDN# pin states (low, high, low-to-high transition and high-to-low transition). Table 8-1 shows all the

supported sequences; where clock input can be applied before or after VDD is applied.

Table 8-1. Flexible Power-up Sequences

VDD

PWRGD/PWRDN#

CLKIN_P/CLKIN_N

Not Present

Running

Floating

Low / Low

Present

0 or 1

Running

Floating

Low / Low

8.3.3 LOS and OE

8.3.3.1 Additional OE# Pins for LMKDB1120 and Backward Compatibility

The DB2000QL specification only defines 8 OE# pins. In the LMKDB1120, 12 additional OE# pins are added so

that each of the 20 outputs has a dedicated OE# pin. This provides additional design flexibility. The LMKDB1120

is backward pin-compatible with DB2000QL because all OE# pins have internal pulldown resistor. When left

floating, these additional OE# pins have no impact (OE# pins are active low), because the three types of OE

controls follow the AND logic.

8.3.3.2 Synchronous OE

Outputs are enabled and disabled synchronously. Synchronous OE means when an output is enabled or

disabled, there is no glitch or runt pulse at the output.

LMKDB1102, LMKDB1104, LMKDB1104FS, LMKDB1108, LMKDB1108FS

LMKDB1112, LMKDB1120, LMKDB1120FS

SNAS855G – NOVEMBER 2023 – REVISED MAY 2026

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Product Folder Links: LMKDB1102 LMKDB1104 LMKDB1104FS LMKDB1108 LMKDB1108FS LMKDB1112 LMKDB1120 LMKDB1120FS

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