Document
STMUX1800E
16-bit to 8-bit MUX/DEMUX for gigabit Ethernet LAN switch with LED switch and enhanced ESD protection
Features
■ Low RON: 4.0 Ω typical
■ VCC operating range: 3.0 to 3.6 V ■ Enhanced ESD protection: > 8 kV (contact)
) and 15 kV (HBM) t(s ■ Low power mode for minimum power c consumption du ■ Channel on capacitance: 9.5 pF typical ro ■ Switching time speed: 9 ns P ■ Near to zero propagation delay: 250 ps te ■ Very low crosstalk: -45 dB at 250 MHz le ■ Bit-to-bit skew: 200 ps so ■ > 600 MHz -3 dB typical bandwidth (or data b frequency) - O ■ Three SPDT switches for LED support ) ■ Rail-to-rail switching on data I/O ports t(s (0 V to 5 V) c ■ Package: QFN42 du ■ Lead-free Pro Applications te ■ 10/100/1000 Mbit Ethernet switching Obsole ■ Audio/video switching
QFN42
Description
The STMUX1800E is a 16 to 8-bit multiplexer/ demultiplexer low RON bidirectional LAN switch designed for various standards, such as 10/100/1000 Ethernet. It is designed for very low crosstalk, low bit-to-bit skew and low I/O capacitance.
The differential signal from the Gigabit Ethernet transceiver is multiplexed into one of two selected outputs while the unselected switch goes to Hi-Z status.
The device integrates three SPDT (single pole dual throw) switches, for LED support.
The device can be put into low power mode
consuming minimum power.
Table 1. Device summary
Order code
Package
STMUX1800EQTR QFN42
Packing Tape and reel
November 2011
Doc ID 16772 Rev 3
1/26
www.st.com
1
Contents
Contents
STMUX1800E
1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Obsolete Product(s) - Obsolete Product(s) 5
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
2/26
Doc ID 16772 Rev 3
STMUX1800E
List of tables
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. LAN switch function table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 4. LED switch function table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 5. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 7. DC electrical characteristics for Gigabit Ethernet LAN8/16MUX/DEMUX
(VCC = 3.3 V ±10%) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 8.
) Table 9. t(s Table 10. c Table 11. u Table 12. d Table 13. ro Table 14. Obsolete Product(s) - Obsolete P Table 15.
DC electrical characteristics for 10/100 Ethernet LAN8/16MUX/DEMUX
(VCC = 3.3 V ±10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Capacitance (TA = 25 °C, f = 1 MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Power supply characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Dynamic electrical characteristics (VCC = 3.3 V ±10%) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Switching characteristics (TA = 25 °C, VCC = 3.3 V ±10%) . . . . . . . . . . . . . . . . . . . . . . . . 13 ESD performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mechanical data for QFN42 (3.5 x 9 x 0.75) - pitch 0.5 mm . . . . . . . . . . . . . . . . . . . . . . . . 21
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Doc ID 16772 Rev 3
3/26
List of figures
List of figures
STMUX1800E
Figure 1. Pin connection (top through view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Input equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8.
Diagram for suggested VCC decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Test circuit for leakage current (IOFF) . . ..