3

SY89837U

Micrel, Inc.

M9999-060410

hbwhelp@micrel.com or (408) 955-1690

PACKAGE/ORDERINGINFORMATION

PinNumber

PinName

PinFunction

1, 3,

IN0, /IN0,

Differential Inputs: These input pairs are the differential signal inputs to the device. These inputs

6, 8

IN1, /IN1

accept AC- or DC-coupled signals as small as 200mV. Each pin of a pair internally terminates to

aVTpinthrough50Ω.Pleaserefertothe“InputInterfaceApplications”sectionformoredetails.

2, 7

VT0, VT1

Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The

VT0andVT1pinsprovideacenter-taptoaterminationnetworkformaximuminterfaceflexibility.

See the “Input Interface Applications” section for more details.

31

SEL

This single-ended TTL/CMOS-compatible input selects the inputs to the multiplexer. This input

isinternallyconnectedtoa25kΩpull-upresistorandwilldefaulttoalogicHIGHstateifleftopen.

9,19,22,32

VCC

Positivepowersupply.Bypasswith0.1µF0.01µFlowESRcapacitorsasclosetothepinsas

possible.

30, 28, 26, 24,

Q0 – Q7,

Differential Outputs: These LVPECL output pairs are the outputs of the device. They are a logic

18, 16, 14, 12,

/Q0 – /Q7

function of the IN0, IN1, and SEL inputs. Please refer to the truth table for details. Unused

29, 27, 25, 23,

output pairs may be left open.

17, 15, 13, 11

20,21

GND,

Ground. Ground and exposed pad to be tied together to most negative potential of chip.

Exposed Pad

10

CAP

Power-On Reset (POR) Initialization Capacitor. When using the multiplexer with RPE capability,

function as a normal multiplexer. See “Application” section for more details. The CAP pin should

never be left open.

4,5

VREF-AC0

Reference Voltage: These outputs bias to V - 1.2V. They are used for AC-coupling inputs

VREF-AC1

(IN,/IN). Connect VREF_AC directly to the VT pin. Bypass with 0.01µF low ESR capacitor to

VCC. See "Input Interface Applications" section. Maximum sink/source current is ±1.5mA.

PIN DESCRIPTION

Package Operating

Package

Lead

PartNumber

Type

Range

Marking

Finish

SY89837UMI

MLF-32

Industrial

SY89837U

Sn-Pb

MLF-32

Industrial

SY89837U

Sn-Pb

MLF-32

Industrial

SY89837U with

Pb-Free

Pb-Free bar-line indicator NiduAu

Industrial

SY89837U with

Pb-Free

Pb-Free bar-line indicator NiduAu

Notes:

2. Tape and Reel.

3. Pb-Free package is recommended for new designs.

CC