Micrel, Inc.

SY88236L/AL

June 2009

3

M9999-063009-A

Pin Configuration

32-Pin MLF

Pin Description

Pin Number

Pin Name

Pin Function

1

LOS/SD_SEL

LOS or SD selection, TTL input. Set high, connect to VCC, or leave open to select LOS. Set low

or connect to GND to select SD.

2

LOSLVL

amplitude at which LOS will be asserted.

3

LOS/SD

Loss-of-Signal (LOS selected): asserts high when the data input amplitude falls below the

Signal Detect (SD selected): asserts low when the data input amplitude falls below the threshold

4

JAM

Active low TTL/CMOS. Internally pulled-up with 75kΩ. Connect to GND or apply a low level

signal (<0.8 V) to enable the post amp output. Can be shorted to LOS/SD (pin 3) to create a

squelch function. The polarity of this input follows the polarity of LOS/SD.

SY88236L: Driver Non-inverting input data. Internally terminated with 50Ω to a reference

voltage.

6

DIN+

SY88236AL: Driver Non-inverting input data. No internal termination.

SY88236L: Driver inverting input data. Internally terminated with 50Ω to a reference voltage.

7

DIN-

SY88236AL: Driver inverting input data. No internal termination.

9

BEN+

Non-Inverting burst enable. Accepts any input, single-ended or differential: TTL/CMOS,

LVPECL, CML, LVDS, and HSTL. BEN requires an external termination. See Figure 2-a-d.

10

BEN-

Inverting burst enable. Accepts any input, single-ended or differential: TTL/CMOS, LVPECL,

CML, LVDS, and HSTL. BEN requires an external termination. See Figure 2-a-d.

11

TXDIS

Internally pulled-up. Pull-down with a 22kΩ or lower resistance or apply a low level signal (<0.8

V) to enable bias and modulation. Keep floating or apply a high level (>2V) to disable bias and

modulation.