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©2020 Renesas Electronics Corporation

February 19, 2020

9SQL4952/9SQL4954/9SQL4958 Datasheet

If SRnS mode is desired, power up with ^vSS_EN_tri = '0'. Do not attempt to switch to the other modes via SMBus control in Byte 1 or a

system reset will be required. If Common Clock (CC) or SRIS mode is desired, power up with ^vSS_EN_tri at either 'M' or '1'. The desired

spread spectrum amount can then be selected via Byte 1 without a requiring a system reset. Once 'M' or '1' is latched at power up, do not

attempt to enter SRnS mode or a system reset will be required.

vOE1#

Input

Active low input for enabling output 1. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

17

17

19

vOE2#

Input

Active low input for enabling output 2. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

25

24

—

vOE3#

Input

Active low input for enabling output 3. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

28

29

—

vOE4#

Input

Active low input for enabling output 4. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

34

—

—

vOE5#

Input

Active low input for enabling output 5. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

37

—

—

vOE6#

Input

Active low input for enabling output 6. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

43

—

—

vOE7#

Input

Active low input for enabling output 7. This pin has an internal pull-down.

1 = disable output, 0 = enable output.

46

—

—

vSADR/REF3.3

Latched

I/O

Latch to select SMBus Address/3.3V LVCMOS copy of X1/REFIN pin

7

6

4

X2

Output

Crystal output.

4

3

2

XIN/CLKIN_25

Input

Crystal input or Reference Clock input. nominally 25MHz.

3

2

1

Table 2. Spread Selection

^vSS_EN_tri Pin

B1[4:3]

Spread%

Note

0

00

0

PCIe SRNS mode.

—

01

-0.25

PCIe Common Clock or SRIS mode.

M (VDD/2)

10

0

PCIe Common Clock or SRIS mode.

1

11

-0.50

PCIe Common Clock or SRIS mode.

Table 1. Pin Descriptions (Cont.)

Name

Type

Description

9SQL4958

Pin No.

9SQL4954

Pin No.

9SQL4952

Pin No.