Micrel, Inc.

SY88232L/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.

SY88232L: Driver Non-inverting input data. Internally terminated with 50Ω to a reference

voltage.

6

DIN+

SY88232AL: Driver Non-inverting input data. No internal termination.

SY88232L: Driver inverting input data. Internally terminated with 50Ω to a reference voltage.

7

DIN-

SY88232AL: Driver inverting input data. No internal termination.

9

/TXDIS

Transmitter Complementary Fast Disable. TTL input. The transmitter is enabled when this pin is

asserted High or left open and disabled when this pin is asserted Low. A 6.3kΩ resistor must be

installed between pin 10 and GND if /TXDIS is used as TTL input.

10

TXDIS

Transmitter Fast Disable. TTL Input. The transmitter is enabled when this pin is asserted Low

and disabled when this pin is asserted High or left open. A 6.3kΩ resistor must be installed

between pins 9 and GND if TXDIS is used as TTL input.

11

/TXEN

Active low TTL/CMOS. Internally pulled-up. Pull-down with a 22kΩ or lower resistance or apply

a low level signal (<0.8V) to enable bias and modulation. Keep floating or apply a high level

(>2V) to disable.