PI3B16248

PI3B16248
3.3V, 24-Bit to 48-Bit
Mux/DeMux NanoSwitch™
Features
Description
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Pericom Semiconductor’s PI3B16248 is a 3.3V, 24-bit to 48-bit
Mux/DeMux Bus Switch designed with a low On-Resistance
allowing inputs to be connected directly to outputs.
Near-Zero propagation delay
RON is 5Ω typical at 3.3V
Fast switching speed: 4.5ns (max.)
VCC operating range: 3.0V to 3.6V
500Ω pulldown to the unconnected B port
Industrial operating temperature: –40°C to +85°C
Make-before-break action
Packaging (Pb-free & Green):
– 80-pin BQSOP (B)
Block Diagram
A1
1B1
A13
500Ω
1B13
500Ω
2B1
2B13
SW
A12
1B12
A24
500Ω
1B24
B
S
500Ω
2B12
A
2B24
S1
S2
Truth Table(1)
Function
S2/S1
A
A to 1B
L
1B
A to 2B
H
2B
Note:
1. H = High Voltage Level, L = Low Voltage Level
1
PS8172F
02/15/06
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux NanoSwitch™
Application Circuit
Pin Configuration
72
72
CPU
72:144
Bus Switch
Core
Logic
128M
DIMM
100 MHz
128M
DIMM
100 MHz
128M
DIMM
100 MHz
3 of 3B16248
128M
DIMM
100 MHz
72 Bits
(64 Bits Data,
8 Bits ECC)
Memory Switching Application
2
PS8172F
02/15/06
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux 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............................................................................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 the Operating Range, TA = –40°C to +85°C, VCC = 3.0 to 3.6V)
Parameters
Test Conditions(1)
Description
Min.
Typ.(2)
Max.
VIH
Input HIGH Voltage
S1, S2
2.0
VIL
Input LOW Voltage
S1, S2
-0.5
IIH
Input HIGH Current
VCC = MAX., VIN = VCC
±1
IIL
Input LOW Current
VCC - MAX., VIN = GND
±1
RON
Switch On-Resistance
VCC = Min., VIN = 0V, ION = 24mA
5
8
VCC = Min., VIN = 0V, ION = 12mA
10
15
Units
V
0.8
CIN
Input Capacitance
VCC = 0V, 25°C, f = 1 MHz
3.5
CON
Output Capacitance
VCC = 0V, 25°C, f = 1 MHz
32
ICC
Power Supple Quiescent
VCC = Max., VIN = GND or VCC
20
IOZH
High Impedance Output Current
0 ≤ A, B ≤ VCC
±1
VIK
Clamp Diode Voltage
VCC = Min., IIN = -18mA
`
-0.7
µA
Ω
pF
µA
-1.2
V
Note:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are shown at VCC = 3.3V, +25°C ambient and maximum loading.
Electrical Characteristics (VCC = 3.0V to 3.6V, TA = –40°C to +85°C)
Parameters
Test Conditions(1)
Description
tPLH
Propagation Delay AX to BX(2,3)
tEN
Bus Enable
tDIS
Bus Disable
tM
Make-before-break time
Com.
Min.
CL = 50pF, RL = 500Ω
CL = 50pF
RL = 500Ω
R = 500Ω
Units
Max.
250
1
4.5
1
5.0
0
2
ps
ns
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.
3
PS8172F
02/15/06
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux NanoSwitch™
Switch Position
Test Circuit
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Propagation Delay Diagram
Enable and Disable Timing
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4
PS8172F
02/15/06
PI3B16248
3.3V, 24-Bit to 48-Bit,
Mux/DeMux NanoSwitch™
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 VCC and GND before applying signals to the
input/output or control pins.
Packaging Mechanical: 80-pin BQSOP (B)
80
41
.150
.157
3.80
4.00
.228
.244
5.80
6.20
.008 NOM
0.203
Gauge Plane
5˚
1
0.50
.019
REF
0.803
0.811
20.40
20.60
.010
.016
.063
1.60
Nom
.0197
BSC
0.50
.007
.010
0.17
0.27
.010
0.254 BSC
.019 0.50
.029 0.75
40
0.254 x 45˚
0.406
.078
2.0
Max
5˚
.002
.009
0.05
0.25
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
Ordering Information
Ordering Code
Package Code
Package Description
PI3B16248B
B
80-pin BQSOP
PI3B16248BE
B
Pb-free & Green, 80-pin BQSOP
Notes:
• Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
• E = Pb-free and Green
• X suffix = Tape/Reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
5
PS8172F
02/15/06