Fairchild FST16244 service manual
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Preliminary
May 2001
Revised May 2001
FST16244
16-Bit Bus Switch (Preliminary)
General Description
The Fairchild Switc h FST16244 provides 16-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 o rganized a s a 16- bit switch . There are fo ur
4-bit switches with separ ate output enable inputs. When
OE
is LOW, the switch in ON and P ort A is connected to
Port B. When OE
impedance state exists between the A and B Ports.
is HIGH, the switch OFF and a high
Ordering Code:
Order Number Package Number Package Description
FST16244MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Connection Diagram Logic Diagram
Features
■ 4Ω switch connection between two ports.
■ Minimal propagation delay through the switch.
■ Low l
■ Zero bounce in flow-through mode.
■ Control inputs compatible with TTL level.
.
CC
FST16244 16-Bit Bus Switch (Preliminary)
Pin Descriptions Truth Table
Pin Name Description
OE
n
, 2An, 3An, 4A
1A
n
1B
, 2Bn, 3Bn, 4B
n
© 2001 Fairchild Semiconductor Corporation DS500420 www.fairchildsemi.com
Output Enable Input (Active LOW)
n
n
Bus A
Bus B
H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance
Inputs Outputs
OE
x
LA Port
HZ
A, B
= B Port
Preliminary
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FST16244
DC Input Voltage (V
DC Input Diode Current (l
DC Output (I
DC V
OUT
/GND Current (ICC/I
CC
Storage Temperature Range (T
) (Note 2) −0.5V to +7.0V
S
) (Note 3) −0.5V to +7.0V
IN
) V
< 0V −50mA
IK
IN
) Current 128mA
) ±100mA
GND
) −65°C to +150 °C
STG
Conditions
Power Supply Operating (V
Input Voltage (V
Output Voltage (V
Input Rise and Fall Time (t
Switch Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC
Free Air Operating Temperature (T
Note 1: The “Absolute Maximum Ratings” are those values bey ond which
the safety of the d evice cannot be guaranteed. The device sh ould not be
operated at these limit s. The parametric values defin ed in the Electrical
Characteristics tables are not guaranteed at the absolute maximum rating.
The “Recomme nded O peratin g Cond itions ” table will defin e the condition s
for actual device operation.
is the voltage observed/applied at either the A or B Ports across
Note 2: V
S
the switch.
Note 3: The input and output ne gative vo ltage ra tings may be excee ded if
the input and output diode current ratings are observed.
Note 4: Unused control inputs must be held HIGH or LOW. They may not
float.
(Note 4)
CC)
)0V to 5.5V
IN
)0V to 5.5V
OUT
, tf)
r
)-40°C to +85°C
A
DC Electrical Characteristics
TA = −40°C to +85°C
Symbol Parameter
V
IK
V
IH
V
IL
I
I
I
OZ
R
ON
I
CC
∆ I
Note 5: Typi c al values are at VCC = 5.0V and TA = +25°C
Note 6: Measured by the volta ge drop between A an d B pins at the indicated c urrent through the switch. On resistance is determined by the lower of the
voltages on the two (A or B) pins.
Clamp Diode Voltage 4.5 −1.2 V IIN = −18mA
HIGH Level Input Voltage 4.0–5.5 2.0 V
LOW Level Input Voltage 4.0–5.5 0.8 V
Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V
OFF-STATE Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
Switch On Resistance 4.5 4 7 Ω VIN = 0V, IIN = 64mA
(Note 6) 4.5 4 7 Ω V
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND, I
Increase in I
CC
per Input 5.5 2.5 mA One Input at 3.4V
CC
CC
(V) (Note 5)
0 ±10 µAV
4.5 7 12 Ω VIN = 2.4V, IIN = 15mA
4.0 11 20 Ω V
Min Typ Max
Units ConditionsV
= 5.5V
IN
CC
= 0V, IIN = 30mA
IN
= 2.4V, IIN = 15mA
IN
Other Inputs at V
4.0V to 5.5V
= 0
OUT
or GND
CC
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