July 2005

ASM5I9658

rev 0.2

3.3V 1:10 LVCMOS PLL Clock Generator

3 of 14

Notice: The information in this document is subject to change without notice.

Table 1: Pin Configuration

Pin #

Pin Name

I/O

Type

Function

6

7

PCLK,

PCLK

Input

LVPECL

LVPECL reference clock signal

2

FB_IN

Input

LVCMOS

PLL feedback signal input, connect to QFB

32

VCO_SEL

Input

LVCMOS

Operating frequency range select

3

BYPASS

Input

LVCMOS

PLL and output divider bypass select

4

PLL_EN

Input

LVCMOS

PLL enable/disable

5

MR/OE

Input

LVCMOS

Output enable/disable (high-impedance tristate) and device reset

28,26,24,

22,20,18,

16,14,12,

10

Q0-9

Output

LVCMOS

Clock outputs

30

QFB

Output

LVCMOS

Clock output for PLL feedback, connect to FB_IN

8,9,13,17

21,25,29

GND

Supply

Ground

Negative power supply (GND)

1

VCC_PLL

Supply

VCC

PLL positive power supply (analog power supply). It is recommended

Please see applications section for details.

11,15,19,

23,27,31

VCC

Supply

VCC

to the positive power supply for correct operation

Table 2: FUNCTION TABLE

Control

Default

0

1

PLL_EN

1

Test mode with PLL bypassed. The reference

clock (PCLK) is substituted for the internal VCO

output. ASM59658 is fully static and no minimum

frequency limit applies. All PLL related AC

characteristics are not applicable.

Selects the VCO output

1

BYPASS

1

Test mode with PLL and output dividers

bypassed. The reference clock (PCLK) is directly

routed to the outputs. ASM59658 is fully static

and no minimum frequency limit applies. All PLL

related AC characteristics are not applicable.

Selects the output dividers.

VCO_SEL

1

VCO ÷ 1 (High frequency range).

MR/OE

0

Outputs enabled (active)

Outputs disabled (high-impedance state) and

reset of the device. During reset the PLL

feedback loop is open. The VCO is tied to its

lowest frequency. The length of the reset

pulse should be greater than one reference

clock cycle (PCLK).

Note: 1 PLL operation requires BYPASS=1 and PLL_EN=1.