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SY10E446

SY100E446

Micrel, Inc.

M9999-032206

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

Pin

Function

SIN, SIN

Differential Serial Data Input

Parallel Data Input

SOUT, SOUT

Differential Serial Data Output

CLK, CLK

Differential Clock Input

CL/4, CL/4

Differential 4 Clock Output

CL/8, CL/8

Differential 8 Clock Output

MODE

Conversion Mode, 4-bit/8-bit

SYNC

Conversion Synchronizing Input

DESCRIPTION

FEATURES

s On-chip clock

s 1.6Gb/s typical data rate capability

s Differential clock and serial inputs

s VBB output for single-ended use

s Asynchronous data synchronization

s Mode select to expand to 8 bits

s Internal 75K

s Fully compatible with Motorola MC10E/100E446

s Available in 28-pin PLCC package

4-BIT PARALLEL-TO-SERIAL

CONVERTER

The SY10/100E446 are integrated 4-bit parallel-to-

serial data converters. These devices are designed to

operate for NRZ data rates of up to a minimum of 1.3Gb/

s. The chips generate a divide-by-4 and a divide-by-8

clock for both 4-bit conversion and a two-chip 8-bit

conversion function. The conversion sequence was

chosen to convert the parallel data into a serial stream

two E446 devices for 8-bit conversion applications.

The SYNC input will asynchronously reset the internal

clock circuitry. This pin allows the user to reset the internal

clock conversion unit and, thus, select the start of the

conversion process.

The MODE input is used to select the conversion mode

of the device. With the MODE input LOW (or open) the

device will function as a 4-bit converter. When the mode

input is driven HIGH, the internal load clock will change

on every eighth clock cycle, thus allowing for an 8-bit

conversion scheme using two E446s. When cascaded in

an 8-bit conversion scheme, the devices will not operate

at the 1.3Gb/s data rate of a single device. Refer to the

applications section of this data sheet for more information

on cascading the E446.

voltage is supplied for single-ended inputs. When

operating at clock rates above 500MHz, differential input

signals are recommended. For single-ended inputs, the

bypassed via a 0.01

switching reference for the input differential amplifier. The

SY10E446

SY100E446

PIN NAMES

Rev.: F

Amendment: /0

Issue Date:

March 2006