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PS7027D 05/10/99
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PI5C32X384/PI5C32X384C
20-Bit, 2-Port BusSwitch
Product Features
Near-zero propagation delay
5
switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power 32X384 (0.2 A typical)
Ideally suited for notebook applications
Packages available:
48-pin 150-mil wide plastic BQSOP (B)
48-pin 240-mil wide plastic TSSOP (A)
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PI5C32X384/32X384C
20-Bit, 2-Port BusSwitch
Logic Block Diagram
Product Pin Configuration
Product Pin Description
Pin Name
Description
BEx
Bus Enable Inputs (Active LOW)
A
19-A0
Bus A
B
19-B0
Bus B
GND
Ground
V
CC
Power
Function
BE
A
BE
B
B
4B0
B
19-B15
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A4-A0
Hi-Z
Connect
H
L
Hi-Z
A19-A15
Connect
L
L
A4-A0
A19-A15
Function
BE
C
BE
D
B
9B5
B
14-B10
Disconnect
H
H
Hi-Z
Hi-Z
Connect
L
H
A9-A5
Hi-Z
Connect
H
L
Hi-Z
A14-A10
Connect
L
L
A9-A5
A14-A10
Truth Table
(1)
Note:
1.H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
Product Description
Pericom Semiconductor's PI5C series of BusSwitch circuits are
produced using the Company's advanced submicron CMOS
technology, achieving industry leading performance.
The PI5C32X384 and PI5C32X384C are 20-bit bus switches
designed with a low ON resistance allowing 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. Four
bus enable signals are provided, one for each of the upper and
lower five bits of the two 10-bit buses.
BE
B
BE
A
A
19
A
15
B
19
B
15
A
4
A
0
B
4
B
0
BE
D
BE
C
A
14
A
10
B
14
B
10
A
9
A
5
B
9
B
5
BE
A
1
B
0
2
A
0
3
A
1
4
B
1
5
B
2
6
A
2
7
A
3
8
B
3
9
B
4
10
A
4
11
GND
12
BE
C
13
B
5
14
A
5
15
A
6
16
B
6
17
B
7
18
A
7
19
A
8
20
B
8
21
B
9
22
A
9
23
GND
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VCC
B
19
A
19
A
18
B
18
B
17
A
17
A
16
B
16
B
15
A
15
BE
B
VCC
B
14
A
14
A
13
B
13
B
12
A
12
A
11
B
11
B
10
A
10
BE
D
48-Pin
PI5C32X384/PI5C32X384C
20-Bit, 2-Port BusSwitch
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PS7027D 05/10/99
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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 condi-
tions above those indicated in the operational sec-
tions 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
= 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
--
--
0.8
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)(C,D)
V
CC
--
--
1
A
I
OS
Short Circuit Current
(3)
A,B (C,D) = 0V, C,D (A,B) = V
CC
--
300
--
mA
V
H
Input Hysteresis at Control Pins
--
150
--
mV
R
ON
Switch ON Resistance
(4)
V
CC
= Min., V
IN
= 0.0V
--
5
7
I
ON
= 48mA
V
CC
= Min., V
IN
= 2.4V
--
10
15
I
ON
= 15mA
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 AB and CD pin at indicated current through the switch. ON resistance is determined
by the lower of the voltages on the two (A or B, C or D) 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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PS7027D 05/10/99
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PI5C32X384/PI5C32X384C
20-Bit, 2-Port BusSwitch
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
PI5C32X384C
60
200
A
Supply Current
PI5C32X384
0.1
3.0
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
1
or BE
2
= GND
Control Input Toggling
50% Duty Cycle
Notes:
1. For Max. or Min. conditons, 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.
PI5C32X384/PI5C32X384C Switching Characteristics over Operating Range
PI5C32X384/32X384C
Parameters Description
Conditions
(1)
Min.
Typ.
Max. Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
0.25
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
t
PZH
Bus Enable Time
1.5
6.5
ns
t
PZL
BE
X
to Ax or Bx
t
PHZ
Bus Disable Time
1.5
5.5
t
PLZ
BEx 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 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.
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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