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FSTU162211

24-Bit Bus Switch with .2V Undershoot Protection and 25з Series Resistors in Outputs (Preliminary)

厂商名称:Fairchild

厂商官网:http://www.fairchildsemi.com/

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Preliminary
FSTU162211 24-Bit Bus Switch with
−2V
Undershoot Protection and 25Ω Series Resistors in Outputs
(Preliminary)
June 2001
Revised June 2001
FSTU162211
24-Bit Bus Switch with
2V Undershoot Protection
and 25
Series Resistors in Outputs (Preliminary)
General Description
The Fairchild Switch FSTU162211 provides 24-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 12-bit or 24-bit bus switch.
When OE
1
is LOW, the switch is ON and Port 1A is con-
nected to Port 1B. When OE
2
is LOW, Port 2A is connected
to Port 2B. The A and B Ports are protected against under-
shoot to support an extended range to 2.0V below ground.
Fairchild’s integrated Undershoot Hardened Circuit
(UHC
) senses undershoot at the I/O and responds by
preventing voltage differentials from developing and turn-
ing the switch on.
The FSTU162211 has equivalent 25
series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Features
s
Undershoot hardened to
2V (A and B Ports)
s
Slower output enable times to prevent signal disruption
s
25
switch connection between two ports
s
Minimal propagation delay through the switch
s
Low l
CC
s
Zero bounce in flow-through mode
s
Control inputs compatible with TTL level
s
See Applications Note AN-5008 for details
Ordering Code:
Order Number
FSTU162211MTD
Package Number
MTD56
Package Description
56-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.
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2001 Fairchild Semiconductor Corporation
DS500064
www.fairchildsemi.com
Preliminary
FSTU162211
Logic Diagram
Connection Diagram
Truth Table
Inputs
OE
1
L
L
H
H
OE
2
L
H
L
H
Inputs/Outputs
1A, 1B
1A
=
1B
1A
=
1B
Z
Z
2A, 2B
2A
=
2B
Z
2A
=
2B
Z
Pin Descriptions
Pin Name
OE
1
, OE
2
1A, 2A
1B, 2B
NC
Description
Bus Switch Enables
Bus A
Bus B
No Connect
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2
Preliminary
FSTU162211
Absolute Maximum Ratings
(Note 1)
Supply Voltage (V
CC
)
DC Switch Voltage (V
S
) (Note 2)
DC Input Control
Pin Voltage (V
IN
) (Note 3)
DC Input Diode Current (l
IK
) V
IN
<
0V
DC Output Current (I
OUT
)
DC V
CC
/GND Current (I
CC
/I
GND
)
Storage Temperature Range (T
STG
)
0.5V to
+
7.0V
0.5V to
+
7.0V
0.5V to
+
7.0V
50 mA
128 mA
Recommended Operating
Conditions
(Note 4)
Power Supply Operating (V
CC)
Input Voltage (V
IN
)
Output Voltage (V
OUT
)
Input Rise and Fall Time (t
r
, t
f
)
Switch Control Input
Switch I/O
Free Air Operating Temperature (T
A
)
0 ns/V to 5 ns/V
0 ns/V to DC
-40
°
C to
+
85
°
C
4.0V to 5.5V
0V to 5.5V
0V to 5.5V
+
/
100 mA
65
°
C to
+
150
°
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:
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
Symbol
V
IK
V
IH
V
IL
I
I
I
OZ
R
ON
Parameter
Clamp Diode Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
Input Leakage Current
OFF-STATE Leakage Current
Switch On Resistance
(Note 6)
V
CC
(V)
4.5
4.0–5.5
4.0–5.5
5.5
0
5.5
4.5
4.5
4.5
4.0
I
CC
I
CC
V
IKU
Quiescent Supply Current
Increase in I
CC
per Input
Voltage Undershoot
5.5
5.5
5.5
20
20
20
20
26
27
28
30
2.0
0.8
±1.0
10
±1.0
38
40
48
48
3
2.5
−2.0
T
A
= −40 °C
to
+85 °C
Min
Typ
(Note 5)
Max
−1.2
Units
V
V
V
µA
µA
µA
µA
mA
V
0
V
IN
5.5V
V
IN
=
5.5V
0
A, B
V
CC
V
IN
=
0V, I
IN
=
64 mA
V
IN
=
0V, I
IN
=
30 mA
V
IN
=
2.4V, I
IN
=
15 mA
V
IN
=
2.4V, I
IN
=
15 mA
V
IN
=
V
CC
or GND, I
OUT
=
0
One Input at 3.4V
Other Inputs at V
CC
or GND
0.0 mA
I
IN
≥ −50
mA
OE
1,2
=
5.5v
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.
Conditions
I
IN
= −18
mA
3
www.fairchildsemi.com
Preliminary
FSTU162211
AC Electrical Characteristics
T
A
= −40 °C
to
+85 °C,
Symbol
Parameter
C
L
=
50pF, RU
=
RD
=
500Ω
V
CC
=
4.5 – 5.5V
Min
t
PHL
, t
PLH
t
PZH
, t
PZL
t
PHZ
, t
PLZ
Propagation Delay Bus to Bus
(Note 7)
Output Enable Time
Output Disable Time
1.5
1.5
Max
1.25
6.0
7.0
V
CC
=
4.0V
Min
Max
1.25
6.5
7.2
ns
ns
ns
V
I
=
OPEN
V
I
=
7V for t
PZL
V
I
=
OPEN for t
PZH
V
I
=
7V for t
PLZ
V
I
=
OPEN for t
PHZ
Figures 2,
3
Figures 2,
3
Figures 2,
3
Units
Conditions
Figure
Number
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
Symbol
C
IN
C
I/O
(Note 8)
Parameter
Typ
3
6
Max
Units
pF
pF
Conditions
V
CC
=
5.0V
V
CC
, OE
=
5.0V
Control Pin Input Capacitance
Input/Output Capacitance
Note 8:
T
A
= +25°C,
f
=
1 MHz, Capacitance is characterized but not tested.
Undershoot Characteristic
Symbol
V
OUTU
Parameter
Output Voltage During Undershoot
Min
2.5
Typ
V
OH
0.3
Max
Units
V
Conditions
Note 9:
This test is intended to characterize the device’s protective capabilities by maintaining output signal integrity during an input transient voltage under-
shoot event.
FIGURE 1.
Device Test Conditions
Parameter
V
IN
R
1
=
R
2
V
TRI
V
CC
Value
see Waveform
100K
11.0
5.5
Units
V
V
V
Transient
Input Voltage (V
IN
) Waveform
www.fairchildsemi.com
4
Preliminary
FSTU162211
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 2. AC Test Circuit
FIGURE 3. AC Waveforms
5
www.fairchildsemi.com
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