85356 Datasheet, PDF (1/15 Pages) Integrated Device Technology – Propagation delay

2:1, Differential-to-3.3V Dual
LVPECL/ECL Clock Multiplexer
85356
DATA SHEET
General Description
The 85356 is a dual 2:1 Differential-to-LVPECL Multiplexer. The
device has both common select and individual select inputs. When
COM_SEL is logic High, the CLKxx input pairs will be passed to the
output. When COM_SEL is logic Low, the output is determined by
the setting of the SEL0 pin for channel 0 and the SEL1 pin for
Channel 1.
The differential input has a common mode range that can accept
most differential input types such as LVPECL, LVDS, LVHSTL,
SSTL, and HCSL. The 85356 can therefore be used as a differential
translator to translate almost any differential input type to LVPECL. It
can also be used in ECL mode by setting V_CC = 0V and V_EE to -3.0V
to - 3.8V.
The 85356 adds negligible jitter to the input clock and can operate at
high frequencies in excess of 900MHz thus making
it ideal for use in demanding applications such as SONET,
Fibre Channel, 1 Gigabit/10 Gigabit Ethernet.
Features
• High speed differential muliplexer. The device can be configured
as a 2:1 multiplexer
• Dual 3.3V LVPECL outputs
• Selectable differential CLKx/nCLKx input pairs
• Differential CLKx/nCLKx pairs can accept the following interface
levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL
• Output frequency: 900MHz (typical)
• Translates any single-ended input signal to 3.3V LVPECL levels
with resistor bias on nCLKx input
• Output skew: 75ps (typical)
• Propagation delay: 1.15ns (typical)
• LVPECL mode operating voltage supply range:
V_CC = 3V to 3.8V, V_EE = 0V
• ECL mode operating voltage supply range:
V_CC = 0V, V_EE = -3V to -3.8V
• -40°C to 85°C ambient operating temperature
• Available in lead-free (RoHS 6) package
Block Diagram
CLK0A ^Pulldown
nCLK0A ^Pullup
0
CLK0B ^Pulldown
CLK0B ^Pullup
1
Q0
nQ0
SEL0 ^Pullup
COM_SEL ^Pulldown
SEL1 ^Pullup
CLK1A ^Pulldown
nCLK1A ^Pullup
0
CLK1B ^Pulldown
CLK1B ^Pullup
1
Q1
nQ1
85356 Rev C 1/5/15
Pin Assignment
CLK0A 1
nCLK0A 2
nc 3
CLK0B 4
nCLK0B 5
CLK1A 6
nCLK1A 7
nc 8
CLK1B 9
nCLK1B 10
20 VCC
19 Q0
18 nQ0
17 SEL0
16 COM_SEL
15 SEL1
14 VCC
13 Q1
12 nQ1
11 VEE
85356
20-Lead SOIC
7.5mm x 12.8mm x 2.3mm package body
M Package
Top View
85356
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm package body
G Package
Top View
1
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