1
PS8421B 05/01/00
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI5C32161C is a 16- to 32-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. Precharge bias
voltage is provided on B ports to minimize live insertion noise. The
A port can handle up to 2V undershoot during switch disable.
Application
Provides PCI Hot Plugging
Logic Block Diagram
Pin Description
Product Features
R
ON
is 5 Ohm typical
Precharge on B1 and B2 ports minimizes
line insertion noise
Undershoot protection on A port only: 2V
Low Power: 70
A typical
Industrial Operation Temperature: 40C to +85C
Near Zero propagation delay
Channel ON Capacitance: 15pF max.
V
CC
Operating Range: +3.0V to +3.6V
ESD>2000V....Human Body Model
>100 MHz switching (enable clock rate)
at 20pF load capacitance
Packages available:
56-pin plastic TSSOP (A)
1
1A
1B2
2B2
3A
3B2
4B2
5A
5B2
6B2
7A
7B2
8B2
GND
Vcc
9A
9B2
10B2
11A
11B2
12B2
13A
13B2
14B2
15A
15B2
16B2
VBIAS2
SEL2
1B1
2B1
2A
3B1
4B1
4A
5B1
6B1
6A
7B1
8B1
8A
GND
VCC
9B1
10B1
10A
11B1
12B1
12A
13B1
14B1
14A
15B1
16B1
16A
VBIAS1
SEL1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
56-Pin
A
PI5C32161C
16-Bit to 32-Bit, Demux PCI Hot-Plug
Bus Switch with 2V Undershoot Protection
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Pullup
16B2
SEL1
16A
1A
SEL2
VBIAS2
VBIAS1
Pullup
16B1
Pullup
1B2
VBIAS2
VBIAS1
Pullup
1B1
PI5C32161C
16-Bit to 32-Bit, Demux PCI Hot-Plug
Bus Switch with 2V Undershoot Protection
2
PS8421B 07/07/00
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DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 10%, V
BIAS
= 1.3V to V
CC
)
Parameters
Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
--
--
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
--
0.8
V
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
--
--
1
A
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
--
--
1
A
I
OZA
High Impedance Output Current A= 0V or V
CC
max., V
BIAS
1 = V
BIAS
2=V
CC
max.
--
--
1
A
I
OZB
High Impedence Output Current B= 0V or V
CC
max., V
BIAS
1 = V
BIAS
2=V
CC
max.
0.2
--
2
mA
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.8
V
r
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V,
--
5
8
I
ON
= 48mA
V
CC
= Min., V
IN
= 2.4V,
--
10
15
I
ON
= 15mA
Storage Temperature ............................................................. 65C to +150C
Ambient Temperature with Power Applied ............................. 40C to +85C
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 functional operation
of the device at these or any other conditions above
those indicated in the operational sections of this
specification is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may affect
reliability.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
n
o
it
c
n
u
F
1
L
E
S
2
L
E
S
1
B
n
o
t
A
n
L
H
2
B
n
o
t
A
n
H
L
1
B
n
o
t
A
n
2
B
n
d
n
a
L
L
,
1
B
n
2
B
n
V
=
S
A
I
B
H
H
PI5C32161C
16-Bit to 32-Bit, Demux PCI Hot-Plug
Bus Switch with 2V Undershoot Protection
3
PS8421B 07/07/00
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PI5C32161C
Com.
Parameters
Description
Conditions
(1)
Min.
Typ.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
0.25
t
PHL
A to B
R
L
= 500
t
PZH
Bus Enable Time
10
35
ns
t
PZL
SEL
TO
A,B
t
PHZ
Bus Disable Time
1
6
t
PLZ
SEL to A,B
Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
--
--
200
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
--
--
2.5
mA
Input @ TTL HIGH
other pin=V
CC
or GND
I
CCD
Supply Current per
V
CC
= Max.,
--
--
0.25
mA/
Input per MHz
(4)
A and B Pins Open
MHz
Control Input Toggling
50% Duty Cycle
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, +25C 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.
5. Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
Switching Characteristics over Operating Range
Notes:
1. See test circuit and waveforms.
2. This parameter is guaranteed but not tested on Propagation Delays.
3. 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.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ.
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
3.5
--
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
4.5
--
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
13.5
--
pF
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, T
A
= 25C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the test should not exceed one second.
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.
5. This parameter is determined by device characterization but is not production tested.
PI5C32161C
16-Bit to 32-Bit, Demux PCI Hot-Plug
Bus Switch with 2V Undershoot Protection
4
PS8421B 07/07/00
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.002
.006
SEATING PLANE
.007
.011
.004
.008
1
56
.236
.244
0.50
0.17
0.27
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
Max.
1.20
6.0
6.2
.547
.555
13.9
14.1
.319
8.1
.0197
BSC
BSC
56-pin TSSOP (A)
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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Ordering Information
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, IN may be driven
low to 0V and high to 5.5V. Driving IN 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 bias
voltage pin and the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd
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