ST STMUX1800L User Manual
June 2009 Doc ID 14869 Rev 4 1/21
21
STMUX1800L
16- to 8-bit MUX/DEMUX for gigabit Ethernet LAN switch
with LED switch and enhanced ESD protection
Features
■ Low R
ON
: 4.0 Ω typical
■ V
CC
operating range: 3.0 to 3.6 V
■ Enhanced ESD protection: > 8 kV (contact) and
15 kV (HBM)
■ Channel on capacitance: 9.5 pF typical
■ Switching time speed: 9 ns
■ Near to zero propagation delay: 250 ps
■ Very low crosstalk: -45 dB at 250 MHz
■ Bit-to-bit skew: 200 ps
■ > 600 MHz -3 dB typical bandwidth (or data
frequency)
■ Three SPDT switches for LED support
■ Rail-to-rail switching on data I/O ports
(0 V to 5 V)
■ Package: QFN56
■ Pb-free
Applications
■ 10/100/1000 Mbit Ethernet switching
■ Audio/video switching
Description
The STMUX1800L is a 16- to 8-bit
multiplexer/demultiplexer low R
ON
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.
QFN56
Table 1. Device summary
Order code Package Packing
STMUX1800LQTR QFN56 Tape and reel
www.st.com
Contents STMUX1800L
2/21 Doc ID 14869 Rev 4
Contents
1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STMUX1800L Pin description
Doc ID 14869 Rev 4 3/21
1 Pin description
Figure 1. Pin connection (top through view)
Table 2. Pin description
Pin Symbol Name and function
2, 3, 7, 8, 11, 12, 14, 15 A, B, C, D, E, F, G, H 8-bit bus
48, 47, 43, 42, 37, 36, 32, 31 A0, B0, C0, D0, E0, F0, G0, H0 8-bit multiplexed to bus 0
46, 45, 41, 40, 35, 34, 30, 29 A1, B1, C1, D1, E1, F1, G1, H1 8-bit multiplexed to bus 1
5 N/C Not connected
17 SEL Bus and LED switch selection
19, 20, 54 LED1, LED2, LED3 LED switch input
22, 23, 25, 26, 51, 52
LED1_0, LED2_0, LED1_1,
LED2_1, LED3_1, LED3_0
LED switch output
4, 10, 18, 27, 38, 50, 56 V
DD
Supply voltage
1, 6, 9, 13, 16, 21, 24, 28, 33,
39, 44, 49, 53, 55
GND Ground
GND
LED1_0
LED2_0
GND
LED1_1
LED2_1
VDD
GND
VDD
GND
LED3
GND
LED3_0
LED3_1
VDD
GND
LED2
LED1
VDD
SEL
GND
H
G
GND
F
E
VDD
GND
D
C
GND
N/C
VDD
B
A
GND
CS000103
H1
G1
H0
GND
F1
E1
E0
VDD
GND
D1
C1
D0
C0
GND
B1
A1
B0
A0
G0
F0
Pin description STMUX1800L
4/21 Doc ID 14869 Rev 4
Figure 2. Input equivalent circuit
Table 3. LAN switch function table
SEL Function
L 8-bit bus to 8-bit multiplexed bus 0
H 8-bit bus to 8-bit multiplexed bus 1
CS000104
STMUX1800L Pin description
Doc ID 14869 Rev 4 5/21
Table 4. LED switch function table
SEL Function
L LED switch input connected to LED switch output X_0
H LED switch input connected to LED switch output X_1
Maximum ratings STMUX1800L
6/21 Doc ID 14869 Rev 4
2 Maximum ratings
Stressing the device above the rating listed in the “absolute maximum ratings” table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
2.1 Recommended operating conditions
Table 5. Absolute maximum ratings
Symbol Parameter Value Unit
V
CC
Supply voltage to ground -0.5 to 4.6 V
V
IO
DC input output voltage -0.5 to 4.6 V
V
IC
DC control input voltage -0.5 to 4.6 V
I
O
DC output current
(1)
1. If V
IO
x I
O
does not exceed the maximum limit of P
D
.
120 mA
P
D
Power dissipation 0.5 W
T
stg
Storage temperature -65 to 150 °C
T
L
Lead temperature (10 sec) 300 °C
Table 6. Recommended operating conditions
Symbol Parameter
Val ue
Unit
Min Typ Max
V
CC
Supply voltage to ground 3 – 3.6 V
V
IC
DC control input voltage (SEL) 0 – 5 V
V
IO
DC input/output voltage 0 – V
CC
V
T
A
Operating temperature -40 – 85 ° C
STMUX1800L Electrical characteristics
Doc ID 14869 Rev 4 7/21
3 Electrical characteristics
Table 7. DC electrical characteristics for Gigabit Ethernet LAN8/16MUX/DEMUX
(V
CC
= 3.3 V ±10%)
Symbol Parameter Test condition
Val ue
Unit-40 to 85 °C
Min Typ Max
V
IH
Voltage input high (SEL) High level guaranteed 2 – – V
V
IL
Voltage input low
(SEL)
Low level guaranteed -0.5 – 0.8 V
V
IK
Clamp diode voltage
(SEL)
V
CC
= 3.6 V
I
IN
= -18 mA
– -0.8 -1.2 V
I
IH
Input high current
(SEL)
V
CC
= 3.6 V
V
IN
= V
CC
––±5µA
I
IL
Input low current
(SEL)
V
CC
= 3.6 V
V
IN
= GND
––±5µA
IOFF
(SW)
(1)
Leakage current through
the switch common
terminals (A to H)
(LED1 to LED3)
V
CC
= 3.6 V
A to H = V
CC
LED1 to LED3 = V
CC
A0 to H0 = 0 V
A1 to H1 = floating
LEDx_0 = 0 V
LEDx1 = floating
SEL = V
CC
––±1µA
IOFF
(SEL)
SEL pin leakage current
V
CC
= 0 V
SEL = 0 to 3.6 V
––±1µA
R
ON
Switch ON resistance
(2)
V
CC
= 3.0 V
V
IN
= 1.5 to V
CC
I
IN
= -40 mA
–4.06.5Ω
R
FLAT
ON resistance flatness
(2)
(3)
V
CC
= 3.0 V
V
IN
at 1.5 and VCC
I
IN
= -40 mA
–0.5–Ω
ΔR
ON
ON resistance match
between channel
ΔR
ON
= R
ONMAX
-R
ONMIN
(2)(4)
V
CC
= 3.0 V
V
IN
= 1.5 to V
CC
I
IN
= -40 mA
–0.41Ω
1. Refer to Figure 4: Test circuit for leakage current (IOFF) on page 11
2. Measured by voltage drop between channels at indicated current through the switch. ON resistance is determined by the
lower of the voltages.
3. Flatness is defined as the difference between the R
ONMAX
and R
ONMIN
of ON resistance over the specified range.
4.
ΔR
ON
measured at same V
CC
, temperature and voltage level.
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