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PDF SY55858U Data sheet ( Hoja de datos )
| Número de pieza | SY55858U | |
| Descripción | DUAL 2 x 2 CML CROSSPOINT SWITCH W/INTERNAL TERMINATION | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Micrel
2.5V/3.3V 3.0GHZ DUAL 2 x 2 CML
CROSSPOINT SWITCH
W/INTERNAL TERMINATION
SuperLite™
SuperSLYit5e5™858U
SY55858U
FEATURES
s Guaranteed AC parameters over temperature:
• fMAX > 3.0GHz (3Gbps)
• tr/ tf < 120ps
• Within-device skew < 25ps
s Non-blocking “switch architecture”
s Configurable as dual 2:1 mux, dual 1:2 fanout buffer,
1:4 fanout buffer, quad buffer, or dual 2 x 2 switch
s 50Ω compatible outputs
s Unique input termination and VT pin for DC-coupled
and AC-coupled input signals–CML or PECL
s Fully differential inputs/outputs
s TTL/CMOS compatible control logic
s Wide supply voltage range: 2.3V to 3.6V
s Wide operating temperature range: –40°C to +85°C
s Available in 32-pin EPAD-TQFP package
DESCRIPTION
SuperLite™
The SY55858U is a low-voltage, high-speed dual 2 x 2
crosspoint switch with a flexible input that accepts CML
or PECL, and a 50Ω compatible differential CML (current-
mode logic) output. The non-blocking design allows any
input to connect to any output. Varying the state of the
select inputs allows SY55858U to be used in backup,
fault tolerant, protection and backplane distribution
applications.
The signal inputs (DA0–1 and DB0–1) have a unique
internal termination design that allows access to the
termination network through VT pins. This feature allows
the device to easily interface to other logic standards
such as AC-coupled or DC-coupled PECL/LVPECL
signals. For applications that require a single-channel
2 x 2 crosspoint, consider the SY55854.
PIN CONFIGURATION
DB1
VTB1
/DB1
SELB0
DB0
VTB0
/DB0
SELB1
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4
Top View
21
EPAD-TQFP
5
H32-1
20
6 19
7 18
8 17
9 10 11 12 13 14 15 16
GND
VCC
QA0
/QA0
VCC
QA1
/QA1
VCC
APPLICATIONS
s SONET/SDH optical transport
s Backplane redundancy
s Add-drop Multiplexers
SuperLite is a trademark of Micrel, Inc.
1
Rev.: C Amendment: /1
Issue Date: September2003
1 page  
Micrel
DC ELECTRICAL CHARACTERISTICS(1)
Symbol
Parameter
VCC Power Supply Voltage
ICC Power Supply Current
Note 1. Specification for packaged product only.
Min.
2.3
—
Typ.
—
150
SuperLite™
SY55858U
Max.
3.6
190
Unit Condition
V
mA No load, over temp.
TTL CONTROL ELECTRICAL CHARACTERISTICS(1)
VCC = 2.3V to 3.6V; GND = 0V; TA = –40°C to +85°C(2)
Symbol
Parameter
Min.
Typ.
VIH Input HIGH Voltage
VIL Input LOW Voltage
IIH Input HIGH Current
2.0
—
—
—
—
—
—
—
IIL Input LOW Current
–300
—
Note 1. Specification for packaged product only.
Note 2. Specifications are guaranteed after thermal equilibrium has been establised.
Max.
—
0.8
+20
+100
—
Unit
V
V
µA
µA
µA
Condition
VIN = 2.7V, VCC = Max.
VIN = VCC, VCC = Max.
VIN = 0.5V, VCC = Max.
CML DC ELECTRICAL CHARACTERISTICS(1)
VCC = 2.3V to 3.6V; GND = 0V; TA = –40°C to +85°C(2)
Symbol
Parameter
Min.
Typ.
Max. Unit Condition
VID Differential Input Voltage
100
—
— mV
RIN Differential Input Resistance
D-to-/D
80
100 120 Ω
VIH Input HIGH Voltage
VIL Input LOW Voltage
VOH
Output HIGH Voltage
VOL Output LOW Voltage
VOUT(SWING) Output Voltage Swing(3)
1.6
—
VCC
V
1.5
—
VCC – 0.1
V
VCC – 0.040
VCC – 0.010
VCC
V
No Load
VCC – 1.00
VCC – 0.800
VCC – 0.650
V
No Load
0.650
—
0.800
0.400
1.00 V
No Load
— 50Ω Environment
ROUT
Output Source Impedance
40
50
60 Ω
Note 1.
Note 2.
Note 3.
Specification for packaged product only.
Device is guaranteed to meet the DC specifications, shown in the table above, after thermal equilibrium has been established. The device is
tested in a socket such that traverse airflow ≥500lfpm is maintained.
VOUT(SWING) is defined as the swing on one output of a differential pair, that is |VOH – VOL| on one pin. The swing for common mode immunity
purposes is 2 × VOUT(SWING). Actual voltage levels and differential swing will depend on customer termination scheme. Typically, a 400mV
swing is available in the 50Ω environment. Refer to the “CML Output Termination Application” section, Figures 3 and 4, for more details.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SY55858U.PDF ] | |
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