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SY10E445

SY100E445

Micrel, Inc.

M9999-032206

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

Pin

Function

SINA, SINA

Differential Serial Data Input A

SINB, SINB

Differential Serial Data Input B

SEL

Serial Input Select Pin

SOUT, SOUT

Differential Serial Data Output

Q0–Q3

Parallel Data Outputs

CLK, CLK

Differential Clock Inputs

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

RESET

Input, Resets the Counters

DESCRIPTION

FEATURES

4-BIT SERIAL-to-PARALLEL

CONVERTER

The SY10/100E445 are integrated 4-bit serial-to-parallel

data converters. The devices are designed to operate for

NRZ data rates of up to 2.5Gb/s. The chip generates 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

Two selectable serial inputs provide a loopback capability

for testing purposes when the device is used in conjunction

with the E446 parallel-to-serial converter.

The start bit for conversion can be moved using the

SYNC input. A single pulse, applied asynchronously for at

least two input clock cycles, shifts the start bit for conversion

an additional pulse must be applied to the SYNC input.

Asserting the SYNC input will force the internal clock dividers

to "swallow" a clock pulse, effectively shifting a bit from the

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 data on the output will change on

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

scheme using two E445s. When cascaded in an 8-bit

conversion scheme, the devices will not operate at the

2.5Gb/s data rate of a single device. Refer to the applications

section of this data sheet for more information on cascading

the E445.

is supplied for single-ended inputs. When operating at clock

rates above 500MHz, differential input signals are

to the inverting differential input and bypassed via a 0.01

µF

couple an input signal.

SY10E445

SY100E445

PIN NAMES

Rev.: F

Amendment: /0

Issue Date:

March 2006