21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
3.3V, 16-Bit, 2-Port
NanoSwitch™
Features
• Near-Zero propagation delay
• 5-ohm switches connect inputs to outputs
• Fast Switching Speed - 4ns max.
• Pin compatible with 74 series 16245
• Operating V
CC
Range: 3.0V to 3.6V
• Industrial operating temperature: –40°C to +85°C
• Packaging (Pb-free & Green available):
– 48-pin 240-mil wide thin plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
Description
Pericom Semiconductor’s PI3B16245 is a 3.3 volt, hot-insertion, 16-
bit, 2-port bus switch that is 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 propagation delay or additional ground bounce noise.
Block Diagram
1
A
0
1
B
0
Pin Configuration
NC
1
B
0
1
B
1
SW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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
1
BE
1
A
0
1
A
1
GND
1
A
7
GND
1
A
2
1
A
3
SW
1
B
7
1
B
2
SW
1
B
3
1
BE
A
B
V
CC
1
B
4
1
B
5
GND
1
B
6
1
B
7
2
B
0
2
B
1
V
CC
1
A
4
1
A
5
GND
1
A
6
1
A
7
2
A
0
2
A
1
BE
2
A
0
SW
2
B
0
2
A
7
SW
2
B
7
GND
2
B
2
2
B
3
GND
2
A
2
2
A
3
2
BE
V
CC
2
B
4
2
B
5
GND
2
B
6
2
B
7
V
CC
2
A
4
2
A
5
GND
2
A
6
2
A
7
2
BE
Truth Table
(1)
Function
Disconnect
Connect
Note:
1. H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
nBE
H
L
nA0-7
Hi- Z
nB0- 7
NC
Pin Description
Pin Name
nBE
nA0- nA7
nB0- nB7
I/O
I
I/O
I/O
Bus A
Bus B
De s cription
Bus Output Enable (Active Low)
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
3.3V, 16-Bit, 2-Port
NanoSwitch™
Maximum Ratings
(Above which useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ...................................................... –65°C to +150°C
Ambient Temperature with Power Applied ...................... –40°C to +85°C
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
Note:
Stresses greater than those listed under MAXIMUM RAT-
INGS 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.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.0V to 3.6V)
Parame te rs
V
IH
V
IL
I
IH
I
IL
I
O ZH
V
IK
R
O N
De s cription
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Switch ON Resistance
(3)
Te s t Conditions
(1)
Guaranteed Logic HIGH
Level
Guaranteed Logic LOW
Level
V
C C
= Max., V
IN
= V
C C
V
C C
= Max., V
IN
= GND
0
≤
A, B
≤
V
C C
V
C C
= Min., I
IN
= –18mA
V
C C
= Min., V
IN
= 0.0V,
I
O N
= 48mA
V
C C
= Min., V
IN
= 2.4V,
I
O N
= 15mA
–0.7
5
10
M in.
2.0
–0.5
0.8
±1
±1
±1
–1.2
8
15
Ω
V
µA
V
Typ.
(2)
M ax.
Units
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parame te rs
(4)
C
IN
C
O FF
C
ON
De s cription
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
V
IN
= 0V
Te s t Conditions
Typ.
3.0
8.5
17.0
pF
Units
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
= 25°C 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.
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
3.3V, 16-Bit, 2-Port
NanoSwitch™
Power Supply Characteristics
Parame te rs
I
CC
∆I
CC
I
CCD
De s cription
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
A and B Pins Open
Control Input Toggling
50% Duty Cycle
V
IN
= GND or V
CC
V
IN
= 3.0V
(3)
M in.
—
—
—
Type
(2)
—
—
—
M ax.
10
750
0.25
µA
Units
mA/
MHz
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, +25°C 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
Conditions
(1)
Parame te rs
t
P LH
t
P HL
t
P ZH
t
P ZL
t
P HZ
t
P LZ
D e s cription
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BEx to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
C
L
= 50pF
R
L
= 500
Ω
C
L
= 50pF ;
R
L
= 500
Ω
C
L
= 50pF ;
R
L
= 500
Ω
1
1
M in.
Com.
M a x.
0.25
4.5
5.0
ns
Units
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.
Applications Information
Logic Inputs
Logic control inputs can be driven up to +5.5V regardless of the supply voltage. For example, given a 5.0V supply, the control or
select pins may be driven low to 0V and high to 5.5V. Driving the control or select pins Rail-toRail
®
minimizes power consumption.
Power-Supply Sequencing and Hot Plug Information
Proper power-supply sequencing is recommended for all CMOS devices. Always apply V
CC
and GND before applying signals to the
input/output or control pins.
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
3.3V, 16-Bit, 2-Port
NanoSwitch™
Packaging Mechanical: 48-pin 240 Mil-Wide Thin Plastic TSSOP (A)
48
.236
.244
6.0
6.2
1
.488 12.4
.496 12.6
.047
1.20 Max
SEATING PLANE
.004 0.09
.008 0.20
0.45 .018
0.75 .030
.319
BSC
8.1
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.0197
BSC
0.50
.007
.010
0.17
0.27
.002
.006
0.05
0.15
Packaging Mechanical: 48-pin 300 Mil-Wide Plastic SSOP (V)
48
.291
.299
7.39
7.59
.395
.420
10.03
10.67
Gauge Plane
.010 0.25
1
.620
.630
15.75
16.00
.02 0.51
.04 1.01
.008
0.20
Nom.
.015 0.381 x 45˚
.025 0.635
.110 2.79
Max
.025 BSC
0.635
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
.008 0.20
.0135 0.34
0-8˚
.008 0.20
.016 0.40
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
3.3V, 16-Bit, 2-Port
NanoSwitch™
Ordering Information
Ordering Code
PI3B16245A
PI3B16245AE
PI3B16245V
PI3B16245VE
Package Code
A
A
V
V
Package Type
48-pin TSSOP
Pb-free & Green, 48-pin TSSOP
48-pin SSOP
Pb-free & Green, 48-pin SSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
2. X = Tape and reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
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