Download FSA1208 Low-Power, Eight-Port, High-Speed Isolation Switch FSA1208 — Low-Power, Eight-Port, Features

FSA1208
Low-Power, Eight-Port, High-Speed Isolation Switch
Features
Description
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ƒ
ƒ
ƒ
Low On Capacitance: 6pF Typical
The FSA1208 is a low-power, eight-port, high-speed
switch. This part is configured as a single-pole, singlethrow switch and is optimized for isolating a high-speed
source, such as a DDR memory bus. The FSA1208
features an extremely low on capacitance (CON) of 6pF.
Superior channel-to-channel crosstalk minimizes
interference.
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ƒ
Wide -3db Bandwidth: > 400MHz
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8kV ESD Rating; >16kV Power/GND ESD Rating
Low On Resistance: 15Ω Typical
Low Power Consumption: 1μA Maximum
10μA Maximum ICCT over an Expanded Voltage
Range (VIN=2.3V, VCC=4.3V)
The FSA1208 contains special circuitry on the A & B
pins that allows the device to withstand an over-voltage
condition. This device is also designed to minimize
current consumption even when the control voltage
applied to the /OE pin is lower than the supply voltage
(VCC). Applications include port isolation and switching
in DDR memory modules, portable cell phones, PDAs,
digital cameras, printers, and notebook computers.
Packaged in Space-Saving 20-Lead MLP
(2.5 x 4.5mm)
Low COFF Capacitance: 2.5pF Typical
Applications
ƒ
DIMM DDR Memory
IMPORTANT NOTE:
For additional performance information, please contact
[email protected].
Ordering Information
Part Number
Top
Mark
Operating
Temperature Range
FSA1208BQX
F1208
-40 to +85°C
Package
Eco Status
20-Lead, Quad, Molded Leadless
Package (MLP), 2.5 x 4.5mm
Green
For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html.
DIMM
1A
2A
3A
4A
5A
6A
7A
8A
FSA1208
OE
VCC
1B
2B
3B
4B
5B
6B
7B
8B
DIMM
DIMM Slot
Figure 1. Analog Symbol
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
November 2009
19
18
17
16
15
14
13
B1
12
B2
B3
B4
B5
B6
B7
B8
20
11
/OE
NC
1
10
VCC
GND
2
3
4
5
6
7
8
A1
9
A2
A3
A4
A5
A6
Figure 2. Pin Assignments for MLP (Top Through View)
Pin Definitions
Pin #
Name
Description
20
/OE
Switch Enable
2-9
1A-8A
A Side of Bus
12-19
1B-8B
B Side of Bus
11
NC
No Connection
1
VCC
Power
10
GND
Ground
A7
A8
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
Pin Configurations
Truth Table
/OE Func
tion
HIGH
Disconnect
LOW
1A-8A=1B-8B
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
2
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device
reliability. The absolute maximum ratings are stress ratings only.
Symbol P
VCC
arameter
Supply Voltage
(1)
VCNTRL
DC Input Voltage (/OE)
VSW
DC Switch I/O Voltage
IIK
DC Input Diode Current
IOUT
DC Output Current
TSTG
Storage Temperature
(1)
Min.
Max.
Unit
-0.50
+5.25
V
-0.50
VCC
V
-0.50
5.25
V
-50
-65
All Pins
50
mA
+150
°C
7.5
Human Body Model, JEDEC: JESD22-A114 I/O to GND
ESD
mA
8
Power to GND
kV
16
Charged Device Model, JEDEC: JESD22-C101
2
Note:
1. The input and output negative ratings may be exceeded if the input and output diode current ratings are
observed.
Recommended Operating Conditions
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
Absolute Maximum Ratings
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol P
VCC
VCNTRL
VSW
TA
arameter
Min.
Max.
Unit
2.3
4.3
V
0
VCC
V
Switch I/O Voltage
-0.5
VCC
V
Operating Temperature
-40
+85
°C
Supply Voltage
(2)
Control Input Voltage (S, /OE)
Note:
2. The control input must be held HIGH or LOW; it must not float.
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
3
All typical values are at 25°C unless otherwise specified.
Symbol P
arameter
Conditions
TA=- 40ºC to +85ºC
Min. T yp.
VIH
Input Voltage High
VIL
Input Voltage Low
IIN
Control Input Leakage
VSW =0 to VCC
4.3
IOZ
Off State Leakage
0 ≤ A, B ≤ 3.6V
4.3
VSW =0V, ION=-10mA
Figure 3
2.5
7
Ω
VSW =1.8V, ION=-10mA
Figure 3
2.5
15
Ω
(3)
-1.2
Units
Clamp Diode Voltage
Switch On Resistance
2.5
Max.
VIK
RON
IIN=-18mA
VCC (V)
V
2.3 to 3.6
1.3
V
4.3
1.7
V
2.3 to 3.6
0.5
V
4.3
0.7
V
-1
1
µA
-2
2
µA
ICC
Quiescent Supply Current
VIN=0 or VCC, IOUT=0
4.3
1
µA
ICCT
Increase in ICC Current Per
Control Voltage and VCC
VIN=1.8V
2.7
10
µA
Notes:
3. Measured by the voltage drop between A and B pins at the indicated current through the switch.
On resistance is determined by the lower of the voltage on the two (A or B ports).
4. Guaranteed by characterization.
AC Electrical Characteristics
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
DC Electrical Characteristics
All typical values are for VCC=2.5V at 25°C unless otherwise specified.
Symbol P
arameter
Conditions
VCC (V)
TA=- 40ºC to +85ºC
Min. T
yp.
Max.
Units
tON
Turn-On Time, /OE to Output
RL=50Ω, CL=5pF
VSW =1.8V
Figure 4, Figure 5
2.3 to 3.6
15
34
ns
tOFF
Turn-Off Time, /OE to Output
RL=50Ω, CL=5pF
VSW =1.8V
Figure 4, Figure 5
2.3 to 3.6
12
25
ns
tPD
Propagation Delay
RL=50Ω, CL=5pF
Figure 4, Figure 6
3.3
0.35
ns
OIRR
Off Isolation
RL=50Ω, f=400MHz
Figure 11
2.3 to 3.6
-40
dB
Xtalk
Non-Adjacent Channel
Crosstalk
RL=50Ω, f=100MHz
Figure 12
2.3 to 3.6
-40
dB
1000
MHz
750
MHz
BW
(5)
-3db Bandwidth
RL=50Ω, CL=0pF
Figure 10
RL=50Ω, CL=5pF
Figure 10
2.3 to 3.6
Note:
5. Guaranteed by characterization.
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
4
Symbol P
arameter
Conditions
(6)
VCC (V)
TA=- 40ºC to +85ºC
Min. T yp.
Max.
Units
tSK(O)
Channel-to-Channel Skew
CL=5pF
3.3
40
80
ps
tSK(P)
Skew of Opposite Transitions
(6)
of the Same Output
CL=5pF
3.3
15
40
ps
CL=5pF
3.3
60
100
ps
tSK(PKG)
(6)
Package-to-Package Skew
Note:
6. Guaranteed by characterization.
Capacitance
Symbol P
arameter
Conditions
TA=- 40ºC to +85ºC
Min. T
yp.
CIN
Control Pin Input Capacitance
VCC=0.2V, f=1MHz
2.0
CON
D+/D- On Capacitance
VCC=2.5V, /OE=0V, f=1MHz
Figure 9
6.0
COFF
D1n, D2n Off Capacitance
VCC and /OE=2.5V, f=1MHz
Figure 8
2.5
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
Max.
Units
pF
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
High-Speed-Related AC Electrical Characteristics
www.fairchildsemi.com
5
VON
An
Bn
VSW
GND
ION
/OE
R ON =
VON / ION
GND
V Sel =
0 orVcc
Figure 3. On Resistance
An
tRISE = 2.5ns
Bn
VSW
GND
CL
RS
RL
tFALL = 2.5ns
VCC
V OUT
Input – V/OE , VSel
GND
10%
GND
V Sel
90%
90%
Output- VOUT
RL , RS , and C L are functions of the application
environment (see AC tables for specific values).
CL includes test fixture and stray capacitance.
VOL
Figure 4. AC Test Circuit Load
VCC /2
VCC /2
VOH
GND
90%
tON
90%
tOFF
Figure 5. Turn-On / Turn-Off Waveforms
tFALL = 500ps
tRISE = 500ps
+400mV
90%
0V
400mV
50%
Input
0V
50%
- 400mV
tPLH
10%
90%
10%
tPHL
VOH
Output
10%
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
Test Diagrams
50%
Output
50%
VOL
t PHL
Figure 6. Propagation Delay
(tR tF – 500ps)
Figure 7. Intra-Pair Skew Test tSK(P)
An
Capacitance
Meter
/OE
Capacitance
Meter
An
/OE
VSel = 0 or Vcc
V Sel = 0 or Vcc
Bn
Bn
Figure 8. Channel Off Capacitance
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
t PLH
Figure 9. Channel On Capacitance
www.fairchildsemi.com
6
Network Analyzer
RS
V IN
GND
VS
GND
VSel
GND
VOUT
GND
RT
GND
RS and RT are functions of the application
environment (see AC Tables for specific values).
Figure 10. Bandwidth
Network Analyzer
RS
VSel
V IN
GND
RT
VS
GND
GND
V OUT
GND
GND
RT
RS and RT are functions of the application
environment (see AC tables for specific values).
GND
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
Test Diagrams (Continued)
Off isolation = 20 Log (VOUT/ VIN)
Figure 11. Channel Off Isolation
Network Analyzer
NC
RS
GND
V IN
VS
VSel
GND
GND
RT
GND
GND
RS and RT are functions of the application environment
(see AC tables for specific values).
RT
V OUT
GND
Crosstalk= 20 Log (VOUT / VIN)
Figure 12. Non-Adjacent Channel-to-Channel Crosstalk
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
7
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
Physical Dimensions
Figure 13. 20-Lead, Molded Leadless Package (MLP)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify
or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions,
specifically the warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
8
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch
© 2008 Fairchild Semiconductor Corporation
FSA1208 Rev. 1.0.1
www.fairchildsemi.com
9