Fairchild FST3306 service manual
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FST3306
2-Bit Low Power Bus Switch
FST3306 2-Bit Low Power Bus Switch
February 2001
Revised February 2001
General Description
The FST3306 is a 2-bit ultra high-speed CMOS FET bus
switch with TTL-compatible active LOW control inputs. The
low on resistance of the switch allows inputs to be connected to outputs with minimal propagation delay and without generating additional ground bounce noise. The device
is organized as a 2-bit switch with independent bus enable
(BE
) controls. When BE is LOW, the switch is ON and
Port A is connected to Port B. When BE
switch is OPEN and a high-impedance state exists
between the two ports. C ontrol inputs t olerate voltages up
to 5.5V independent of V
.
CC
is HIGH, the
Features
■ Typical 3Ω switch resistance at 5.0V V
■ Minimal propagation delay through the switch
■ Power down high impedance input/output
■ Zero bounce in flow through mode .
■ TTL compatible active LOW control inputs
■ Control inputs are overvoltage tolerant
CC
Ordering Code:
Order Number Package Number Package Description
FST3306MTC MTC08 8-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Devices also availab le in Tape and Reel. Specify by appending the suffix letter “X” to the o rdering code.
Logic Symbol Connection Diagram
(Top View)
Pin Descriptions Function Table
Pin Name Description
ABus A
BBus B
BE
© 2001 Fairchild Semiconductor Corporation DS500479 www.fairchildsemi.com
Bus Enable Input
Bus Enable Input BE Function
L B Connected to A
H Disconnected
H = HIGH Logic Level
L = LOW Logic Level
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (VS)
FST3306
DC Output Voltage (V
) (Note 2) −0.5V to +7.0V
IN
−0.5V to +7.0V
DC Input Diode Current
) VIN < 0V −50 mA
(I
IK
DC Output (I
DC V
CC
Storage Temperature Range (T
Junction Lead Temperature under Bias (T
Lead Temperature (T
) Current 128 mA
OUT
or Ground Current (ICC/GND) ±100 mA
) −65°C to +150°C
STG
)
L
) +150°C
J
(Soldering, 10 seconds)
Power Dissipation (P
) @ +85°C 250 mW
D
+260°C
Conditions
Supply Operating (V
Control Input Voltage (V
Switch Input Voltage (V
Output Voltage (V
Operating Temperature (T
Input Rise and Fall Time (t
Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC
Thermal Resistance (
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 ratings.
The “Recomme nded O peratin g Cond itions ” table will defin e the condition s
for actual device operation.
Note 2: 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 3: Unused logic inputs must be held HIGH or LOW. They may not
float.
(Note 3)
) 4.0V to 5.5V
CC
) 0V to 5.5V
IN
) 0V to 5.5V
IN
) 0V to 5.5V
OUT
) −40°C to +85°C
A
, tf)
r
θ
)250°C/W
JA
DC Electrical Characteristics
V
Symbol Parameter
V
V
V
V
I
I
R
I
∆I
Clamp Diode Voltage 4.5 −1.2 V IIN = −18 mA
IK
HIGH Level Input Voltage 4.0–5.5 2.0 V
IH
LOW Level Input Voltage 4.0–5.5 0.8 V
IL
HIGH Level Output Voltage 4.5–5.5 see Figure 3 V VIN = V
OH
Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V
IN
Switch OFF Leakage Current 5.5 ±1.0 µA0 ≤ A, B, ≤ V
OFF
Switch On Resistance 4.5 3 7
ON
(Note 4) 4.5 3 7 VIN = 0V, IIN = 30 mA
Quiescent Supply Current 5.5 3 µAVIN = VCC or GND,
CC
Increase in ICC per Input 5.5 1 2.5 mA VIN = 3.4V, IO = 0,
CC
(Note 5) Control Input Only
Note 4: 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.
Note 5: Per TTL driven input (V
= 3.4V, control input only). A and B pins do not contribute to I
IN
CC
(V) Min Typ Max
4.5 6 15 V
4.0 10 20 V
TA = −40°C to +85°C
CC.
Units Conditions
CC
VIN = 0V, IIN = 64 mA
Ω
I
CC
= 2.4V, IIN = 15 mA
IN
= 2.4V, IIN = 15 mA
IN
= 0
OUT
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