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PI5C32861
10-Bit, 2-Port Bus Switch
with 25
Series Resistor
PS8104 03/14/97
Product Pin Configuration
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
VCC
BE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
24-PIN
Q24
S24
Product Pin Description
Pin Name
Description
BE
Bus Enable Input (Active LOW)
A
0
9
Bus A
B
0
9
Bus B
GND
Ground
V
CC
Power
Function
BE
A
09
Disconnect
H
Hi-Z
Connect
L
B
09
Truth Table
(1)
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Logic Block Diagram
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PI5C32861
10-Bit, 2-Port Bus Switch
with 25
Series Resistor
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced
using the Companys advanced 0.8 micron CMOS technology,
achieving industry leading performance.
The PI5C32861 is a 10-bit, 2-port bus switch designed with a low
ON resistance that permits inputs to be connected directly to
outputs. The bus switch creates no additional propagational delay
or additional ground bounce noise. The switches are turned ON
by the Bus Enable (BE) input signal. The PI5C32861 is designed
with an internal 25
resistor that reduces noise reflection in high-
speed applications
Product Features
Near zero propagation delay
5
switches with 25
series resistor connect inputs
to outputs
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2A Typical)
Ideally suited for notebook applications
Packages available:
24-pin 150 mil wide plastic QSOP (Q)
24-pin 300 mil wide plastic SOIC (S)
BE
A
9
A
0
B
9
B
0
PI5C32861
10-Bit, 2-Port Bus Switch
with 25
Series Resistor
2
PS8104 03/14/97
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Storage Temperature ......................................................... 65C to +150C
Ambient Temperature with Power Applied ........................ 40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc 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 specifica-
tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 5%)
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
OZH
High Impedance Output Current
0 - A, B - V
CC
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
0.7
1.2
V
I
OS
Short Circuit Current
(3)
A (B) = 0V, B (A) = V
CC
100
mA
V
H
Input Hysteresis at Control Pins
150
mV
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
18
28
40
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
18
35
48
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
6
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
8
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 Vcc = 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 pin 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.
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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PI5C32861
10-Bit, 2-Port Bus Switch
with 25
Series Resistor
PS8104 03/14/97
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
0.1
10
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
2.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
0.25
mA/
Input per MHz
(4)
A and B Pins Open
MHz
BE = GND
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 Vcc = 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 3.4V, control inputs only); A and B pins do not contribute to Icc.
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
PI5C32861
Com.
Parameters
Description
Conditions
(1)
Min
Max
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
1.25
ns
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
t
PZH
Bus Enable Time
1.5
6.5
ns
t
PZL
BE to Ax or Bx
t
PHZ
Bus Disable Time
1.5
5.5
ns
t
PLZ
BE to Ax or Bx
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 1.25ns 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.
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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