PI5C34171C
17-Bit to 34-Bit, DeMux PCI Hot-Plug
Bus Switch with –2V Undershoot Protection
Features
•
•
•
•
•
•
•
•
R
ON
is 5-ohm typical
Undershoot protection on A port only: –2V
Industrial Operation Temperature: –40ºC to +85ºC
Near-Zero propagation delay
Channel On-Capacitance: 15pF max.
V
CC
Operating Range: +5V ±10%
>2kV ESD Protection (human body model)
>100 MHz switching (enable clock rate) at
20pF load capacitance
• Packaging (Pb-free & Green available):
– 56-pin plastic TSSOP (A)
Description
The PI5C34171C is a 17 to 34-bit demultiplexer bus switch. It is
intended for PCI Hot-Plug applications. Industry leading advantages
include a propagation delay of 250ps, resulting from 5-ohm channel
resistance, and low I/O Capacitance. A port demultiplexes to either
1B and 2B or to both. The switch is bidirectional. The A port can
handle up to –2V undershoot during switch disable.
Application
• Provides PCI Hot Plugging
Block Diagram
1
A
1
B
1
Pin Description
2
B
1
2
A
3
B
1
4
B
1
4
A
B
1
5
6
B
1
6
A
7
B
1
8
B
1
8
A
GND
V
CC
9
B
1
10
B
1
10
A
11
B
1
12
B
1
12
A
13
B
1
14
B
1
14
A
15
B
1
16
B
1
16
A
17
B
1
SEL
1
1
B
1
1
B
2
17
A
17
B
1
17
B
2
SEL
1
SEL
2
Truth Table
Function
n
A to
n
B
1
n
A to
n
B
2
n
A to
n
B
1
n
B
1
,
n
B
2
SEL1
L
H
SEL2
H
L
L
H
and
n
B
2
L
H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
1
A
1
B
2
2
B
2
3
A
3
B
2
4
B
2
5
A
5
B
2
6
B
2
7
A
7
B
2
GND
9
A
9
B
2
10
B
2
11A
11
B
2
12
B
2
13
A
13
B
2
14
B
2
15
A
15
B
2
16
B
2
17
B
2
SEL
2
17
A
8
B
2
= Hi-Z
06-0231
1
PS8498D
05/02/07
PI5C34171C
17-Bit to 34-Bit, DeMux PCI Hot-Plug
Bus Switch with –2V Undershoot Protection
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ............................................................ –65°C to +150°C
Ambient Temperature with Power Applied ........................... –40°C to +85°C
Supply Voltage to Ground Potential (Inputs & V
CC
Only) ..... –0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) ..–0.5V to +7.0V
DC Input Voltage .................................................................... –0.5V to +7.0V
DC Output Current............................................................................... 120mA
Power Dissipation ................................................................................... 0.5W
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and func tion al
op er a tion of the device at these or any other con-
di tions above those indicated in the operational
sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods
may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5V ±10%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZ
V
IK
R
ON
V
UP
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Switch On-Resistance
(4)
Undershoot Protection Voltage
(3)
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max., V
IN
= V
CC
V
CC
= Max., V
IN
= GND
0
≤
A, B
≤
V
CC
V
CC
= Min., I
IN
= –18mA
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
Max. Inputs, Undershoot Pulse Duration < 25ns
–0.7
5
10
–1.8
8
18
–2.0
Ω
V
±1
μA
Min. Typ
(2)
Max. Units
2
–0.5
0.8
V
Notes:
1. For Min. or max. conditions, use appropriate value specfied under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, T
A
= 25°C ambient and maximum loading.
3. On A
N
(Data Input) pins only.
4. Measured by the voltage drop between A and B pins at indicated current through the switch. On-Resistance is determined by the lower of the
voltages on the two (A & B) pins.
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OFF(B)
C
ON
Input Capacitance
B Capacitance, Switch Off
A/B Capacitance, Switch On
V
IN
= 0V
Description
Test Conditions
Typ.
3.5
4.5
13.5
pF
Max.
Units
Notes:
1. This parameter is determined by device characterization but is not production tested.
06-0231
2
PS8498D
05/02/07
PI5C34171C
17-Bit to 34-Bit, DeMux PCI Hot-Plug
Bus Switch with –2V Undershoot Protection
Power Supply Characteristics
Parameters
I
CC
∆I
CC
Description
Quiescent Power Supply Current
Supply Current per Input
@ TTL HIGH
Supply Current per Input per
MHz
(4)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max., A & B
Pins Open Control
Input Toggling 50%
Duty Cycle
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
other
pin = V
CC
or GND
Min. Typ.
(2)
Max.
200
2.5
Units
μA
mA
mA/
MHz
I
CCD
0.60
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only); A and B pins do not contribute to I
CC
.
4. This current applies to the control inputs only and represent the current required to switch internal capacitance at the specified frequency. The
A and B inputs generate no significant AC or DC currents as they transition. This parameter is not tested, but is guaranteed by design.
Switching Characteristics over Operating Range
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(1,2)
A to B
Bus Enable Time SEL to A,B
Bus Disable Time SEL to A,B
C
L
= 50pF
R
L
= 500-ohm
10
1
Conditions
Com
Min.
Typ.
0.25
40
6
ns
Max.
Units
Notes:
1. This parameter is guaranteed but not tested on Propagation Delays.
2. The bus switch contributes no propagational delay other than the RC delay of the On-Resistance of the switch and the load capacitance. The
time constant for the switch alone is of the order of 0.25ns for 50pF load. Since this time constant is much smaller than the rise/fall times of
typical driving signals, it adds very little propagational delay to the system. Propagational delay of the bus switch when used in a system is
determined by the driving circuit on the driving side of the switch and its interaction with the load on the driven side.
Applications Information
Logic Inputs
The logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a +5.0V supply, control inputs
may be driven low to 0V and high to 5.5V. Driving control inputs Rail-to-Rail
®
minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
before applying signals to the input/output
or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
06-0231
3
PS8498D
05/02/07
PI5C34171C
17-Bit to 34-Bit, DeMux PCI Hot-Plug
Bus Switch with –2V Undershoot Protection
Packaging Mechanical: 56-pin TSSOP (A)
Ordering Information
Ordering Code
PI5C34171CA
PI5C34171CAE
Package Code
A
A
Package Description
56-pin 240-mil plastic TSSOP
Pb-free & Green, 56-pin 240-mil plastic TSSOP
Notes:
•
Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
•
E = Pb-free & Green
• Adding an
X suffix = Tape/Reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
06-0231
4
PS8498D
05/02/07
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