1
PS8189C 09/13/99
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
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Product Features
Near-zero propagation delay
5
switches connect inputs to outputs
Fast Switching Speed - 4ns max.
Permits Hot Insertion
Pin compatible with 74 series16245
Operating Vcc Range: 3.0V to 3.6V
Industrial operating temperature: 40C to +85C
Packages available:
48-pin 240 mil wide thin plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
PI3B16245
PI3B162245 (25
)
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
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
Function
nBE
nA
07
Disconnect
H
Hi-Z
Connect
L
nB
07
Truth Table
(1)
Note: 1. H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
Product Description
Pericom Semiconductor's PI3B series of logic circuits are produced
using the Company's advanced 0.35 micron CMOS technology.
The PI3B16245 and PI3B162245 are 3.3 volt, hot-insertion, 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 switches create
no additional propagational delay or additional ground bounce
noise.
The PI3B162245 device has a built-in 25-ohm series resistor to
reduce noise resulting from reflections, thus eliminating the need
for an external terminating resistor.
48-Pin
A, V
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
2
PS8189C 09/13/99
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PI3B16245/PI3B162245
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ
Units
C
IN
Input Capacitance
V
IN
= 0V
3.0
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
8.5
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 0V
17.0
pF
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 3.0V to 3.6V)
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
R
ON
Switch On Resistance
(3)
V
CC
= Min., V
IN
= 0.0V,
16245
--
5
8
I
ON
= 48mA
162245
20
28
40
V
CC
= Min., V
IN
= 2.4V,
16245
--
10
15
I
ON
= 15mA
162245
2 0
3 5
4 8
Storage Temperature ....................................................... 65C to +150C
Ambient Temperature with Power Applied ........................ 0C to +85C
Supply Voltage Range ........................................................ 0.5V to +4.6V
DC Input Voltage ............................................................... 0.5V to +4.6V
DC Output Current ......................................................................... 120 mA
Power Dissipation ............................................................................... 0.5W
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
= 3.3V, T
A
= 25C ambient and maximum loading.
3. 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.
4. 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.)
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 indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect reliability.
3
PS8189C 09/13/99
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PI3B16245/PI3B162245
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
Com.
Parameters
Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF 16245
0.25
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
162245
1.25
t
PZH
Bus Enable Time
C
L
= 50pF, R
L
= 500
1
4.5
ns
t
PZL
BE to Ax or Bx
t
PHZ
Bus Disable Time
C
L
= 50pF, R
L
= 500
1
5.0
t
PLZ
BE to Ax or Bx
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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
10
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.0V
(3)
750
A
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 V
CC
= 3.3V, +25C ambient.
3. Per TTL driven input (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
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.
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Ordering Information
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