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Fairchild Semiconductor |
www.DataSheet4U.com
November 1998
Revised December 1999
FST16210
20-Bit Bus Switch
General Description
The Fairchild Switch FST16210 provides 20-Bits of high-
speed 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 10-bit or 20-Bit bus switch.
When OE1 is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE2 is LOW, Port 2A is connected
to Port 2B.
Features
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.
Ordering Code:
Order Number Package Number
Package Description
FST16210MTD
MTD48
48-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.
Connection Diagram
Logic Diagram
Pin Descriptions
Pin Name
OE1, OE2
1A, 2A
1B, 2B
Description
Bus Switch Enables
Bus A
Bus B
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
© 1999 Fairchild Semiconductor Corporation DS500193
www.fairchildsemi.com
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC)
DC Switch Voltage (VS)
DC Input Voltage (VIN) (Note 2)
DC Input Diode Current (lIK) VIN<0V
DC Output (IOUT) Sink Current
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
−50mA
128mA
+/− 100mA
−65°C to +150 °C
Recommended Operating
Conditions (Note 3)
Power Supply Operating (VCC)
Input Voltage (VIN)
Output Voltage (VOUT)
Input Rise and Fall Time (tr, tf)
Switch Control Input
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
0nS/V to 5nS/V
Switch I/O
0nS/V to DC
Free Air Operating Temperature (TA) -40 °C to +85 °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 operation.
Note 2: The input and output negative voltage ratings may be exceeded if
the input and output diode current ratings are observed.
Note 3: Unused control inputs must be held high or low. They may not float.
DC Electrical Characteristics
Symbol
Parameter
VCC
(V)
TA = −40 °C to +85 °C
Min
Typ
(Note 4)
Max
Units
Conditions
VIK
VIH
VIL
II
IOZ
RON
ICC
∆ ICC
Clamp Diode Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
OFF-STATE Leakage Current
Switch On Resistance
(Note 5)
Quiescent Supply Current
Increase in ICC per Input
4.5
4.0–5.5
4.0–5.5
5.5
0
5.5
4.5
4.5
4.5
4.0
5.5
5.5
Note 4: Typical values are at VCC = 5.0V and TA = +25°C
2.0
−1.2
V IIN = −18mA
V
0.8 V
±1.0
µA 0≤ VIN ≤5.5V
10 µA VIN = 5.5V
±1.0
µA 0 ≤A, B ≤VCC
4 7 Ω VIN = 0V, IIN = 64mA
4 7 Ω VIN = 0V, IIN = 30mA
8 12 Ω VIN = 2.4V, IIN = 15mA
11 20 Ω VIN = 2.4V, IIN = 15mA
3 µA VIN = VCC or GND, IOUT = 0
2.5 mA One input at 3.4V
Other inputs at VCC or GND
Note 5: 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
voltages on the two (A or B) pins.
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