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November 2009

FSA1208 Rev. 1.0.1

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



FSA1208

Low-Power, Eight-Port, High-Speed Isolation Switch

Features

 Low On Capacitance: 6pF Typical

 Low On Resistance: 15Ω Typical

 Low Power Consumption: 1μA Maximum

 10μA Maximum I

CCT

over an Expanded Voltage

Range (V

=2.3V, V

=4.3V)

 Wide -3db Bandwidth: > 400MHz

 Packaged in Space-Saving 20-Lead MLP

(2.5 x 4.5mm)

 8kV ESD Rating; >16kV Power/GND ESD Rating

 Low C

OFF

Capacitance: 2.5pF Typical

Applications

 DIMM DDR Memory

IMPORTANT NOTE:

For additional performance information, please contact

analogswitch@fairchildsemi.com

Description

The FSA1208 is a low-power, eight-port, high-speed

switch. This part is configured as a single-pole, single-

throw switch and is optimized for isolating a high-speed

source, such as a DDR memory bus. The FSA1208

features an extremely low on capacitance (C

) of 6pF.

Superior channel-to-channel crosstalk minimizes

interference.

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

). Applications include port isolation and switching

in DDR memory modules, portable cell phones, PDAs,

digital cameras, printers, and notebook computers.

Ordering Information

Part Number

Top

Mark

Operating

Temperature Range

Package

Eco Status

FSA1208BQX F1208 -40 to +85°C

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

DIMM Slot

OEOE V

FSA1208

DIMM

Figure 1. Analog Symbol

Summary of content (9 pages)

PAGE 1
FSA1208 Low-Power, Eight-Port, High-Speed Isolation Switch Features Description 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.
PAGE 2
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.
PAGE 3
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.
PAGE 4
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.
PAGE 5
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.
PAGE 6
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.
PAGE 7
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.
PAGE 8
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.
PAGE 9
FSA1208 — Low-Power, Eight-Port, High-Speed Isolation Switch © 2008 Fairchild Semiconductor Corporation FSA1208 Rev. 1.0.1 www.fairchildsemi.