Fairchild Semiconductor FSTD3306 Datasheet
February 2001
Revised February 2001
FSTD3306
2-Bit Low Power Bus Switch with Level Shifting
FSTD3306 2-Bit Low Power Bus Switch with Level Shifting
General Description
The FSTD3306 is a 2-bit ult ra high-sp eed CMOS FET bus
switch with enhanced level sh ifting circuitry and w ith TTLcompatible active LOW c ontrol inputs. The low on resistance of the switch allows inputs to be connect ed to outputs with minimal propagation delay and without
generating addition al ground bounce nois e. The device is
organized as a 2-bit swi tch with independent bus enabl e
(BE
) controls. When BE is LOW, the switch is ON and Port
A is connected to Port B. When BE
OPEN and a high-impedance sta te exist s between the two
ports. Reduced voltag e drive to the gat e of the FET switch
permits nominal level shifting of 5V to 3V through the
switch. Control inputs tolerate voltages up to 5.5V independent of V
.
CC
is HIGH, the switch is
Features
■ Typical 3Ω switch resistance at 5.0V VCC, VIN = 0V
■ Level shift facilitates 5V to 3.3V interfacing
■ Minimal propagation delay through the switch
■ Power down high impedance input/output
■ Zero bounce in flow t h rough mode
■ TTL compatible active LOW control inputs
■ Control inputs are overvoltage tolerant
Ordering Code:
Order Number Package Number Package Description
FSTD3306MTC MTC08 8-Lead Thin Shrink Small Outline Package (TS SOP), 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 Diagram Connection Diagram
(Top View)
Pin Descriptions Function Table
Pin Name Description
A Bus A Switch I/O
B Bus B Switch I/O
BE
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Bus Enable Input
Bus Enable Input (BE) Function
L B Connected to A
H = HIGH Logic Level
L = LOW Logic Level
H Disconnected
Absolute Maximum Ratings(Note 1) Recommended Operating
Supply Voltage (VCC) −0.5V to +7.0V
DC Switch Voltage (V
FSTD3306
DC Output Voltage (V
) −0.5V to +7.0V
S
) (Note 2) −0.5V to +7.0V
IN
DC Input Diode Current
) VIN < 0V −50 mA
(I
IK
DC Output (I
DC V
CC
(I
CC/IGND
Storage Temperature Range (T
) Sink Current 128 mA
OUT
or Ground Current
) ±100 mA
) −65°C to +150°C
STG
Junction Temperature
under Bias (T
Junction Lead Temperature (T
) +150°C
J
)
L
(Soldering, 10 Seconds)
Power Dissipation (P
) @ +85°C250 mW
D
+260°C
Conditions
Supply Operating (V
Control Input Voltage (V
Switch Input Voltage (V
Switch Output Voltage (V
Operating Temperature (T
Input Rise and Fall Time (t
Control Input 0 ns/V to 5 ns
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)
) 4.5V 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
IK
V
IH
V
IL
V
OH
I
IN
I
OFF
R
ON
I
CC
∆ I
Note 4: 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.
Note 5: Per TTL driven input (V
Clamp Diode Voltage 4.5 −1.2 V IIN = −18 mA
HIGH Level Input Voltage 4.5–5.5 2.0 V
LOW Level Input Voltage 4.5–5.5 0.8 V
HIGH Level Output Voltage 4.5–5.5 see Figure 3 V VIN = V
Input Leakage Current 5.5 ±1.0 µA0 ≤ VIN ≤ 5.5V
Power OFF Leakage Current 5.5 ±1.0 µA0 ≤ A, B ≤ V
Switch On Resistance 4.5 3 7
(Note 4) 4.5 3 7 V
Quiescent Supply Current 5.5 VIN = VCC or GND, I
Increase in ICC per Input
CC
(Note 5) Input Only, Other BE = V
= 3.4V, control input only). A and B pins do not contribute to ICC.
IN
CC
(V) Min Typ Max
4.5 15 50 VIN = 2.4V, IIN = 15 mA
5.5 1 2.5 mA
TA = −40°C to +85°C
1.1 1.5 mA BE
10 µABE1 = BE2 = V
Units Conditions
CC
VIN = 0V, IIN = 64 mA
Ω
VIN = 3.4V, IO = 0, one Control
CC
= 0V, IIN = 30 mA
IN
= BE2 = GND
1
= 0
OUT
CC
CC
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