1
PS7025B 06/21/00
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Product Features
Near-zero propagation delay
5
switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power (0.2A typical)
Ideally suited for notebook applications
Pin compatible with 74 series16245
Industrial operating temperature: 40C to +85C
Packages available:
48-pin 240 mil wide thin plastic TSSOP (A)
48-pin 150 mil wide plastic BQSOP (B)
48-pin 300 mil wide plastic SSOP (V)
PI5C16245
PI5C162245 (25
)
16-Bit, 2-Port Bus Switch
Logic Block Diagram
Product Pin Configuration
Product Pin Description
Pin Name
I/O
Description
nBE
I
Bus Enable Input (Active LOW)
nA
0
-nA
7
I/O
Bus A
nB
0
-nB
7
I/O
Bus B
Truth Table
(1)
Note: 1. H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced
using the Companys advanced 0.6 micron CMOS technology.
The PI5C16245 and PI5C162245 are 16-bit, 2-port bus switches
that are pin compatible with the 74 series 16245 16-bit transceiver.
Two enable signals (nBE) turn the switches on, similar to the enable
signals of the 16245. The bus switch creates no additional
propagational delay or additional ground bounce noise.
The PI5C162245 device has a built-in 25-ohm series resistor to reduce
reflection noise, thus eliminating the need for an external terminating
resistor.
1
BE
1
A
7
1
A
0
1
B
7
1
B
0
2
BE
2
A
7
2
A
0
2
B
7
2
B
0
NC
1
1
B
0
2
1
B
1
3
GND
4
1
B
2
5
1
B
3
6
V
CC
7
1
B
4
8
1
B
5
9
GND
10
1
B
6
11
1
B
7
12
2
B
0
13
2
B
1
14
GND
15
2
B
2
16
2
B
3
17
V
CC
18
2
B
4
19
2
B
5
20
GND
21
2
B
6
22
2
B
7
23
NC
24
1
BE
48
1
A
0
47
1
A
1
46
GND
45
1
A
2
44
1
A
3
43
V
CC
42
1
A
4
41
1
A
5
40
GND
39
1
A
6
38
1
A
7
37
2
A
0
36
2
A
1
35
GND
34
2
A
2
33
2
A
3
32
V
CC
31
2
A
4
30
2
A
5
29
GND
28
2
A
6
27
2
A
7
26
2
BE
25
48-Pin
A,B,V
n
o
it
c
n
u
F
E
B
n
7
-
0
A
n
t
c
e
n
n
o
c
si
D
H
Z
-i
H
t
c
e
n
n
o
C
L
7
-
0
B
n
PI5C16245/162245
16-Bit, 2-Port Bus Switch
2
PS7025B 06/21/00
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DC Electrical Characteristics
(Over Operating Range, T
A
= 40C to +85C, V
CC
= 5V 10%)
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,
16245
--
5
7
I
ON
= 48mA
162245
20
28
40
V
CC
= Min., V
IN
= 2.4V,
16245
--
10
15
I
ON
= 15mA
162245
20
35
48
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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 maximum
rating conditions for extended periods may
affect reliability.
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 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.
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PS7025B 06/21/00
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PI5C16245/162245
16-Bit, 2-Port Bus Switch
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
3.0
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
nBE = 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 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.
PI5C16245 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.
PI5C162245 Switching Characteristics over Operating Range
s
r
e
t
e
m
a
r
a
P
n
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it
p
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(
,
x
A
x
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t
x
B
x
,
x
B
x
o
t
x
A
x
C
L
F
p
0
5
=
R
L
0
0
5
=
5
2
.
0
s
n
t
H
Z
P
t
L
Z
P
e
m
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el
b
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,
x
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A
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x
5
.
1
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.
6
t
Z
H
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t
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L
P
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el
b
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,
x
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x
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5
.
5
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x
A
x
o
t
x
B
x
,
x
B
x
o
t
x
A
x
C
L
F
p
0
5
=
R
L
0
0
5
=
5
2
.
1
s
n
t
H
Z
P
t
L
Z
P
e
m
I
T
el
b
a
n
E
s
u
B
,
x
B
x
r
o
x
A
x
o
t
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B
x
5
.
1
5
.
6
t
Z
H
P
t
Z
L
P
e
m
I
T
el
b
a
si
D
s
u
B
,
x
B
x
r
o
x
A
x
o
t
E
B
x
5
.
1
5
.
5
PI5C16245/162245
16-Bit, 2-Port Bus Switch
4
PS7025B 06/21/00
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Applications Information
Logic Inputs
The logic enable inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a +5.0V
supply, the enable pins(s) may be driven low to 0V and high to 5.5V. Driving the enable pin(s) Rail-to-Rail
minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply Vcc before applying
signals to the input/output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola.
R
t
r
a
P
e
g
a
k
c
a
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i
P
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u
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a
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p
m
e
T
A
5
4
2
6
1
C
5
I
P
)
A
(
P
O
S
S
T
-
8
4
C
5
8
+
o
t
C
0
4
-
B
5
4
2
6
1
C
5
I
P
)
B
(
P
O
S
Q
B
-
8
4
V
5
4
2
6
1
C
5
I
P
)
V
(
P
O
S
S
-
8
4
Ordering Information
48-Pin TSSOP (240 Mil Wide) - Package Code: A
.236
.244
.488
.496
.002
.006
SEATING PLANE
.007
.010
.0197
BSC
.004
.008
.319
1
48
12.4
12.6
6.0
6.2
0.50
0.17
0.27
8.1
0.05
0.15
0.09
0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.018
.030
0.45
0.75
.047
1.20 Max
BSC
5
PS7025B 06/21/00
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PI5C16245/162245
16-Bit, 2-Port Bus Switch
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
48-Pin SSOP (300 Mil Wide) - Package Code: V
0.20
0.51
1.01
0.25
0.381
0.635
.008
.008
.016
0-8
0.20
0.40
.110 2.79
.010
Gauge Plane
.02
.04
.015
.025
x 45
.025 BSC
0.635
.291
.299
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
7.39
7.59
.395
.420
10.03
10.67
.620
.630
15.75
16.00
.008
.0135
0.20
0.34
1
48
Nom.
Max
48-Pin BQSOP (150 Mil Wide) - Package Code: B
.014
.0157 BSC
0.40
0.356
.008 0.20
.002
.009
5
0.05
0.25
.079
2.0
.010 0.25
Gauge Plane
.150
.157
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
3.80
4.00
.228
.244
5.80
6.20
.020
.029
0.50
0.75
.063
1.60
.015 0.381
.386
.394
9.80
10.00
.0051
.009
0.13
0.23
1
48
x 45
BSC
Nom
Max
Nom
REF
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