Document
Preliminary
FSTU16211 24-Bit Bus Switch with −2V Undershoot Protection (Preliminary)
May 2001 Revised May 2001
FSTU16211 24-Bit Bus Switch with −2V Undershoot Protection (Preliminary)
General Description
The Fairchild Switch FSTU16211 provides 24-bits of highspeed CMOS TTL-compatible bus switching. The low On Resistance of the switch allows inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The device is organized as a 12-bit or 24-bit bus switch. When OE1 is LOW, the switch is ON and Port 1A is connected to Port 1B. When OE2 is LOW, Port 2A is connected to Port 2B. The A and B Ports are protected against undershoot to support an extended range to 2.0V below ground. Fairchild’s integrated Undershoot Hardened Circuit (UHC) senses undershoot at the I/O and responds by preventing voltage differentials from developing and turning the switch on.
Features
s Undershoot hardened to −2V (A and B Ports) s Slower output enable times to prevent signal disruption s 4Ω switch connection between two ports s Minimal propagation delay through the switch s Low lCC s Zero bounce in flow-through mode s Control inputs compatible with TTL level s See Applications Note AN-5008 for details
Ordering Code:
Order Number FSTU16211MTD Package Number MTD56 Package Description 56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2001 Fairchild Semiconductor Corporation
DS500389
www.fairchildsemi.com
Preliminary FSTU16211 Logic Diagram Connection Diagram
Truth Table
Inputs OE1 L L H H OE2 L H L H Inputs/Outputs 1A, 1B 1A = 1B 1A = 1B Z Z 2A, 2B 2A = 2B Z 2A = 2B Z
Pin Descriptions
Pin Name OE1, OE2 1A, 2A 1B, 2B Description Bus Switch Enables Bus A Bus B
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Preliminary
FSTU16211
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Switch Voltage (VS) (Note 2) DC Input Control Pin Voltage (VIN) (Note 3) DC Input Diode Current (lIK) VIN < 0V DC Output Current (IOUT) DC VCC/GND Current (ICC/IGND) Storage Temperature Range (TSTG)
−0.5V to +7.0V −0.5V to +7.0V −0.5V to +7.0V −50 mA
128 mA
Recommended Operating Conditions (Note 4)
Power Supply Operating (VCC) Input Voltage (VIN) Output Voltage (VOUT) Input Rise and Fall Time (tr, tf) Switch Control Input Switch I/O Free Air Operating Temperature (TA) 0 ns/V to 5 ns/V 0 ns/V to DC -40 °C to +85 °C 4.0V to 5.5V 0V to 5.5V 0V to 5.5V
+/− 100 mA −65°C to +150 °C
Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum rating. The “Recommended Operating Conditions” table will define the conditions for actual device operatio.