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SY89845UMGTR

Description
PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION
Categorylogic    logic   
File Size623KB,18 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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SY89845UMGTR Overview

PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION

SY89845UMGTR Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
MakerMicrochip
Parts packaging codeDFN
package instructionMLF-24
Contacts24
Manufacturer packaging codeMLF
Reach Compliance Codecompliant
Other featuresALSO OPERATES WITH 3.3V SUPPLY
series89845
JESD-30 codeS-XQCC-N24
length4 mm
Logic integrated circuit typeMULTIPLEXER
Number of functions1
Number of entries2
Output times1
Number of terminals24
Maximum operating temperature85 °C
Minimum operating temperature-40 °C
Output polarityCOMPLEMENTARY
Package body materialUNSPECIFIED
encapsulated codeHVQCCN
Encapsulate equivalent codeLCC24,.16SQ,20
Package shapeSQUARE
Package formCHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
method of packingTR
Maximum supply current (ICC)140 mA
propagation delay (tpd)0.84 ns
Maximum seat height0.9 mm
Maximum supply voltage (Vsup)2.625 V
Minimum supply voltage (Vsup)2.375 V
Nominal supply voltage (Vsup)2.5 V
surface mountYES
Temperature levelINDUSTRIAL
Terminal formNO LEAD
Terminal pitch0.5 mm
Terminal locationQUAD
width4 mm
SY89845U
Precision CML Runt Pulse Eliminator 2:1 MUX
with 1:2 Fanout and Internal Termination
General Description
The SY89845U is a low jitter CML, 2:1 differential
input multiplexer (MUX) optimized for redundant
source switchover applications. Unlike standard
multiplexers, the SY89845U unique 2:1 Runt Pulse
Eliminator (RPE) MUX prevents any short cycles or
“runt” pulses during switchover. In addition, a unique
Fail-Safe Input protection prevents metastable
conditions when the selected input clock fails to a
DC voltage (voltage between the pins of the
differential input drops below 100mV).
The differential input includes Micrel’s unique, 3-pin
input termination architecture that allows customers
to interface to any differential signal (AC- or DC-
coupled) as small as 100mV (200mV
PP
) without any
level shifting or termination resistor networks in the
signal path. The outputs are 400mV CML with fast
rise/fall times guaranteed to be less than 80ps.
The SY89845U operates from a 2.5V ±5% or 3.3V
±10% supply and is guaranteed over the full
industrial temperature range of –40°C to +85°C. The
SY89845U is part of Micrel’s high-speed, Precision
®
Edge product line.
All support documentation can be found on Micrel’s
web site at:
www.micrel.com.
Precision Edge
®
Features
Selects between two sources, and provides a glitch-
free, stable CML output
Guaranteed AC performance over temperature and
supply voltage:
– Wide operating frequency: 1kHz to >1.5GHz
– < 840ps In-to-Out t
pd
– < 80ps t
r
/t
f
Unique, patent-pending input isolation design
minimizes crosstalk
Fail-Safe Input prevents oscillations
Ultra-low jitter design:
– <1ps
RMS
random jitter
– <1ps
RMS
cycle-to-cycle jitter
– <10ps
PP
total jitter (clock)
– <0.7ps
RMS
MUX crosstalk induced jitter
Unique patented input termination and VT pin accepts
DC- and AC-coupled inputs (CML, PECL, LVDS)
400mV CML output swing
2.5V ±5% or 3.3V ±10% supply voltage
-40°C to +85°C industrial temperature range
Available in 24-pin (4mm x 4mm) QFN package
Applications
Redundant clock switchover
Fail-safe clock protection
Markets
LAN/WAN
Enterprise servers
ATE
Test and measurement
Precision Edge is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2005
M9999-052405
hbwhelp@micrel.com
or (408) 955-1690

SY89845UMGTR Related Products

SY89845UMGTR SY89845U
Description PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION PRECISION CML RUNT PULSE ELIMINATOR 2:1 MUX WITH 1:2 FANOUT AND INTERNAL TERMINATION

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