Micrel, Inc.

SY87739L

June 2011

2

M9999-061511

hbwhelp@micrel.com

Ordering Information

Part Number

Package Type

Operating Range

Package Marking

Lead Finish

SY87739LHI

H32-2

Industrial

SY87739LHI

Sn-Pb

SY87739LHITR

(2)

H32-2

Industrial

SY87739LHI

Sn-Pb

SY87739LHY

H32-2

Industrial

SY87739LHY with Pb-Free Bar Line Indicator

Matte-Sn

Pb-Free

SY87739LHYTR

(2, 3)

H32-2

Industrial

SY87739LHY with Pb-Free Bar Line Indicator

Matte-Sn

Pb-Free

Notes:

1.

2.

Tape and Reel.

3.

Pb-Free package is recommended for new designs.

Pin Configuration

ePad TQFP (H32-2)

Pin Description

Pin Number

Pin Name

Pin Function

1, 24

VCCA

Analog Supply (Power). Set to same voltage as VCC.

2, 5, 11, 12,

13, 15, 16,

19, 20, 23,

28, 29

NC

No Connect. These pins are to be left unconnected.

3, 4

REFCLK

±

Reference Clock Input (Differential PECL Input): This is a clock derived from an oscillator or other

sufficiently accurate frequency source. The frequency provided at this input determines, along with

the programming, the output frequency at REFOUT

±. Micrel recommends using a 27.000MHz

frequency source.

6

PROGCS

Program Interface Chip Select (TTL Input): This signal forms part of the MicroWire™ interface. When

active high, this signal permits the acquisition of serial data. A falling edge on this input causes

SY87739L to re-acquire lock to a new frequency, based on the program downloaded to it.

or (408) 955-1690