21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C16861
Product Features
Near-zero propagation delay
5-Ohm switches connect inputs to outputs
High Bandwidth (>400 MHz)
Rail-to-Rail 3.3V or 2.5V switching
Permits Hot Insertion
High Bandwidth data switching
Hot Docking
2.5V Supply Voltage Operation
Packages available:
48-pin 240-mil wide plastic TSSOP (A)
48-pin 150-mil wide plastic BQSOP (B)
48-pin 300-mil wide plastic SSOP (V)
Product Description
2.5V/3.3V, High Bandwidth, Hot Insertion,
20-Bit, 2-Port BusSwitch
Pericom Semiconductors PI3C series of Bus Switch circuits are
produced using the Companys advanced submicron CMOS
technology, achieving industry leading speed.
The PI3C16861 is configured as a 2.5V or 3.3 volt, hot insertion, 20-
bit, 2-port bus switch designed with a low ON resistance (5 Ohm)
allowing inputs to be connected directly to outputs. The bus switch
creates no additional propagational delay or additional ground
bounce noise. The switch is turned ON by the Bus Enable (BE) input
signal. The device is 5V I/O Tolerant.
This device is very useful in switching signals that have high
bandwidth (>400 MHz) requirements.
Logic Block Diagram
Product Pin Configuration
48 Pin
A, B, V
Truth Table
(1)
Function
Disconnect
Connect
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
BE
X
H
L
A19 - A0
Hi- Z
B19 - B0
Product Pin Description
Pin Name
BEx
A
19-A0
B
19-B0
1
Description
Bus Enable Inputs (Active LOW)
Bus A
Bus B
PS8424C
01/09/01
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
Maximum Ratings
(Above which the 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 to Ground Potential (Inputs & Vcc Only) ........ 0.5V to +4.6V
Supply Voltage to Ground Potential (Outputs & D/O Only) ..... 0.5V to +4.6V
DC Input Voltage ................................................................... 0.5V to +5.5V
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.
DC Electrical Characteristics
(Over Operating Range, T
A
= 40°C to +85°C, V
CC
= 3.3V ±10%)
Parameters Description
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
R
ON
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Switch On Resistance
(4)
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max., V
IN
= V
CC
V
CC
= Max., V
IN
= GND
0
≤A,
B
≤V
CC
V
CC
= Min., I
IN
= 18mA
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15mA
Min.
2.0
0.5
Typ
(2)
Max.
0.8
±1
±1
±1
Units
V
µA
V
Ω
0.73
5
8
1.2
7
15
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parame te rs
(5)
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.
3.5
5.0
10.0
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. 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.
2
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
Power Supply Characteristics
Parame te rs
I
CC
∆I
CC
D e s cription
Q uiescent Power Supply Current
Supply Current per Input @ TTL HIGH
Te s t Conditions
V
CC
= Max.
V
IN
= GND or V
CC
V
IN
= 3.0V
(3)
M in.
Typ.
260
M ax.
850
2.5
Units
µA
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 input only); A and B pins do not contribute to I
CC
.
Switching Characteristics over 3.3V Operating Range
PI3C16861
Com.
Parame te rs
T
PLH
T
PHL
T
PZH
T
PZL
T
PHZ
T
PLZ
D e s cription
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BE to Ax or Bx
Bus Disable Time
BE to Ax or Bx
C
L
= 50pF, R
L
= 500
Ω
1.5
5.5
Conditions
M in.
M ax.
0.25
6.5
ns
Units
Switching Characteristics over 2.5V Operating Range
PI3C16861
Com.
Parame te rs
T
PLH
T
PHL
T
PZH
T
PZL
T
PHZ
T
PLZ
De s cription
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BE to Ax or Bx
Bus Disable Time
BE to Ax or Bx
C
L
= 50pF, R
L
= 500
Ω
1.5
8.3
Conditions
M in.
M ax.
0.25
9.8
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.
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PS8424C
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VOUT, (V)
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
4.0
VCC = 3.3V
3.1V
2.9V
2.7V
2.5V
2.3V
3.8V
3.6V
3.4V
3.2V
3.0V
2.8V
2.0
0.0
0.0
1.0
2.0
VIN, (V)
3.0
4.0
5.0
Output Voltage vs. Input Voltage over Various Supply Voltages
Output Voltage vs. Input Voltage over Various Supply Voltages
48-Pin TSSOP (A) Package
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
Ordering Information
Part
PI3C16861A
PI3C16861B
PI3C16861V
Pin Package
48- TSSOP (A)
48- BQSOP (B)
48- SSOP (V)
Te mpe rature
- 40°C to +85°C
- 40°C to +85°C
- 40°C to +85°C
4
PS8424C
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3C16861
2.5V/3.3V, High Bandwidth,
Hot Insertion, 20-Bit, 2-Port Bus Switch
48-Pin BQSOP (B) Package
48
.150
.157
3.80
4.00
.228
.244
5.80
6.20
Gauge Plane
.010 0.25
BSC
.386
.394
9.80
10.00
.020
.029
0.50
0.75
1
.015 0.381 x 45˚
.008 0.20
Nom
Nom
.063 1.60
.079
2.0
Max
.002 0.05
.009 0.25
.014 0.356
REF
5˚
.0157 BSC
0.40
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
.0051
.009
0.13
0.23
48-Pin SSOP (V) Package
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
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
5
PS8424C
01/09/01
MCU
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