MAX9389 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Differential 8:1 ECL/PECL Multiplexer with Dual Output Buffers

19-2688; Rev 0; 1/03
Differential 8:1 ECL/PECL Multiplexer with
Dual Output Buffers
General Description
The MAX9389 is a fully differential, high-speed, low-jitter,
8-to-1 ECL/PECL multiplexer (mux) with dual output
buffers. The device is designed for clock and data distri-
bution applications, and features extremely low propa-
gation delay (310ps typ) and output-to-output skew
(30ps max).
Three single-ended select inputs, SEL0, SEL1, and SEL2,
control the mux function. The mux select inputs are com-
patible with ECL/PECL logic, and are internally refer-
enced to the on-chip reference output (V_BB1, V_BB2),
nominally V_CC - 1.425V. The select inputs accept signals
between V_CC and V_EE. Internal pulldowns to V_EE ensure
a low default condition if the select inputs are left open.
The differential inputs D_, D_ can be configured to
accept a single-ended signal when the unused comple-
mentary input is connected to the on-chip reference
output (V_BB1, V_BB2). All the differential inputs have
internal bias and clamping circuits that ensure a low
output state when the inputs are left open.
The MAX9389 operates with a wide supply range V_CC -
V_EE of 2.375V to 5.5V. The device is offered in 32-pin
TQFP and thin QFN packages, and operates over the
-40°C to +85°C extended temperature range.
Applications
High-Speed Telecom and Datacom Applications
Central-Office Backplane Clock Distribution
DSLAM/DLC
Pin Configurations
TOP VIEW
VCC 1
VBB2 2
VBB1 3
D0 4
D0 5
D1 6
D1 7
VCC 8
32 31 30 29 28 27 26 25
MAX9389
24 SEL1
23 SEL0
22 VCC
21 D7
20 D7
19 D6
18 D6
17 VEE
9 10 11 12 13 14 15 16
TQFP
Pin Configurations continued at end of data sheet.
Features
o 310ps Propagation Delay
o Guaranteed 2.7GHz Operating Frequency
o 0.3ps_RMS Random Jitter
o <30ps Output-to-Output Skew
o -2.375V to -5.5V Supplies for Differential
LVECL/ECL
o +2.375V to +5.5V Supplies for Differential
LVPECL/PECL
o Outputs Low for Open Inputs
o Dual Output Buffers
o >2kV ESD Protection (Human Body Model)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9389EHJ
-40°C to +85°C 32 TQFP
MAX9389ETJ*
-40°C to +85°C 32 Thin QFN
*Future product—contact factory for availability.
Functional Diagram
D0
MAX9389
D0
D1
D1
D2
VCC
D2
VEE
D3
D3
Q0
MUX
D4
81
Q0
D4
Q1
D5
Q1
D5
VBB1
D6
VBB2
D6
D7
D7
VCC
SEL0
232kΩ
180kΩ
SEL1
D_
SEL2
D_
165kΩ 180kΩ
180kΩ
VEE
VEE
________________________________________________________________ Maxim Integrated Products 1
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