FST16245MTDX

© 2005 Fairchild Semiconductor Corporation DS500419 www.fairchildsemi.com
April 2001
Revised June 2005
FST16245 16-Bit Bus Switch
FST16245
16-Bit Bus Switch
General Description
The Fairchild Switch FST16245 provides 16-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 16-bit switch. There are two
8-bit switches with separate output enable inputs. When
OE
is LOW, the switch is ON and Port a is connected to
Port B. When OE
is HIGH, the switch is OFF and a high
impedance state exists between the A and B Ports.
Features
4 switch connection between two ports.
Minimal propagation delay through the switch.
Low l
CC
.
Zero bounce in flow-through mode.
Control inputs compatible with TTL level.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Pin Descriptions
Logic Diagram
Truth Table
H HIGH Voltage Level
L
LOW Voltage Level
Z
High Impedance
Order Number Package Number Package Description
FST16245MTD MTD48 48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Name Description
OE
n
Output Enable Input (Active LOW)
1A
n
, 2A
n
, 3A
n
, 4A
n
Bus A
1B
n
, 2B
n
, 3B
n
, 4B
n
Bus B
NC No Internal Connection
Inputs Outputs
OE
x
A, B
LA Port
B Port
HZ
www.fairchildsemi.com 2
FST16245
Absolute Maximum Ratings(Note 1) Recommended Operating
Conditions
(Note 4)
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: V
S
is the voltage observed/applied at either the A or B Ports across
the switch.
Note 3: The input and output negative voltage ratings may be exceeded 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.
DC Electrical Characteristics
Note 5: Typical values are at V
CC
5.0V and T
A
25 C
Note 6: 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.
Supply Voltage (V
CC
) 0.5V to 7.0V
DC Switch Voltage (V
S
) (Note 2) 0.5V to 7.0V
DC Input Voltage (V
IN
) (Note 3) 0.5V to 7.0V
DC Input Diode Current (l
IK
) V
IN
0V 50mA
DC Output Current (I
OUT
)128mA
DC V
CC
/GND Current (I
CC
/I
GND
) 100mA
Storage Temperature Range (T
STG
) 65 C to 150 C
Power Supply Operating (V
CC)
4.0V to 5.5V
Input Voltage (V
IN
)0V to 5.5V
Output Voltage (V
OUT
)0V to 5.5V
Input Rise and Fall Time (t
r
, t
f
)
Switch Control Input 0 ns/V to 5 ns/V
Switch I/O 0 ns/V to DC
Free Air Operating Temperature (T
A
)-40 C to 85 C
Symbol Parameter
T
A
40 C to 85 C
Units ConditionsV
CC
Min Typ Max
(V) (Note 5)
V
IK
Clamp Diode Voltage 4.5 1.2 V I
IN
18mA
V
IH
HIGH Level Input Voltage 4.05.5 2.0 V
V
IL
LOW Level Input Voltage 4.05.5 0.8 V
I
I
Input Leakage Current 5.5 1.0 A0 V
IN
5.5V
0 10 AV
IN
5.5V
I
OZ
OFF-STATE Leakage Current 5.5 1.0 A0 A, B V
CC
R
ON
Switch On Resistance 4.5 4 7 V
IN
0V, I
IN
64 mA
(Note 6) 4.5 4 7 V
IN
0V, I
IN
30 mA
4.5 7 12 V
IN
2.4V, I
IN
15 mA
4.0 11 20 V
IN
2.4V, I
IN
15 mA
I
CC
Quiescent Supply Current 5.5 3 AV
IN
V
CC
or GND, I
OUT
0
I
CC
Increase in I
CC
per Input 5.5 2.5 mA One Input at 3.4V
Other Inputs at V
CC
or GND
3 www.fairchildsemi.com
FST16245
AC Electrical Characteristics
Note 7: This parameter is guaranteed by design but is not tested. The bus switch contributes no propagation delay other than the RC delay of the typical On
Resistance of the switch and the 50pF load capacitance, when driven by an ideal voltage source (zero output impedance).
Capacitance (Note 8)
Note 8: T
A
25 C, f 1 MHz, Capacitance is characterized but not tested.
AC Loading and Waveforms
Note: Input driven by 50 source terminated in 50
Note: C
L
includes load and stray capacitance
Note: Input PRR
1.0 MHz, t
W
500 ns
FIGURE 1. AC Test Circuit
FIGURE 2. AC Waveforms
Symbol Parameter
T
A
40 C to 85 C,
Units Conditions
C
L
50pF, RU RD 500 Figure
V
CC
4.5 – 5.5V V
CC
4.0V Number
Min Max Min Max
t
PHL
, t
PLH
Propagation Delay Bus-to-Bus
(Note 7)
0.25 0.25 ns V
I
OPEN Figures
1, 2
t
PZH
, t
PZL
Output Enable Time 1.0 5.6 6.1 ns V
I
7V for t
PZL
Figures
1, 2
V
I
OPEN for t
PZH
t
PHZ
, t
PLZ
Output Disable Time 1.0 5.5 5.9 ns V
I
7V for t
PLZ
Figures
1, 2
V
I
OPEN for t
PHZ
Symbol Parameter Typ Max Units Conditions
C
IN
Control Pin Input Capacitance 3 pF V
CC
5.0V, V
IN
0V
C
I/O
Input/Output Capacitance OFF State 6pFV
CC
, OE 5.0V, V
IN
0V

FST16245MTDX

Mfr. #:
Manufacturer:
ON Semiconductor / Fairchild
Description:
Digital Bus Switch ICs 16-Bit Bus Switch
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet