ETC PI3B3245Q

PI3B3245
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3.3V, Hot Insertion
8-Bit, 2-Port, BusSwitch
Product Features
Product Description
•
•
•
•
•
Near zero propagation delay
5 Ohm switches connect inputs to outputs
Fast Switching Speed - 4.5ns max.
Permits Hot Insertion
Ultra Low Quiescent Power (0.2µA Typical)
– Ideally suited for notebook applications
• TTL-compatible control of inputs levels
• Packages available:
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 173 mil wide plastic TSSOP (L)
Pericom Semiconductor’s PI3B series of logic circuits are produced
using the Company’s advanced sub micron CMOS technology,
achieving industry leading performance.
The PI3B3245 is a 3.3V 8-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 switches are turned ON by
the Bus Enable (BE) input signal.
Logic Block Diagram
Product Pin Configuration
A0
B0
A7
B7
1
2
20
19
VCC
BE
A1
A2
3
4
18
17
B0
B1
A3
A4
5 20-Pin 16
Q,L
6
15
B2
B3
A5
A6
7
8
14
13
B4
B5
A7
9
12
B6
10
11
B7
GND
BE
Product Pin Description
Truth Table(1)
Function
Disconnect
Connect
NC
A0
BE
H
L
Pin Name
BE
A0–7
B0–7
GND
VCC
A0–7
Hi-Z
B0–7
Notes:
H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
1
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
PS8162D
01/05/00
PI3B3245
3.3V, Hot Insertion
8-Bit, 2-Port, BusSwitch
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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 +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 =3.3V ±10%)
Test Conditions(1)
Parameters Description
Min. Typ(2)
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
–0.5
IIH
Input HIGH Current
IIL
Input LOW Current
IOZH
High Impedance Output Current 0 ≤ IN, YN ≤ VCC
VIK
Clamp Diode Voltage
RON
Switch On
Resistance(3)
Max.
Units
V
0.8
V
VCC = Max., VIN = VCC
±1
µA
VCC = Max., VIN = GND
±1
µA
±1
µA
–1.2
V
8
17
Ω
VCC = Min., IIN = –18mA
VCC = Min., VIN = 0.0V, ION = 48mA or 64mA
VCC = Min., VIN = 2.4V,ION = 15mA
5
10
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(4)
Description
Test Conditions
Typ.
Units
CIN
COFF
Input Capacitance
A/B Capacitance, Switch Off
VIN = 0V
VIN = 0V
3.0
8.0
pF
pF
CON
A/B Capacitance, Switch On
VIN = 0V
16.0
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 VCC = 3.3V, TA = 25°C ambient and maximum loading.
3. Measured by the voltage drop betweenAand 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.
2
PS8162D
01/05/00
PI3B3245
3.3V, Hot Insertion
8-Bit, 2-Port, BusSwitch
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Power Supply Characteristics
Test Conditions(1)
Parameters Description
Min.
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
∆ICC
Supply Current per
Input HIGH
VCC = Max.
VIN = 3.0V(3)
Typ(2)
Max.
Units
0.1
3.0
µA
750
µA
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 3.3V, +25°C ambient.
3. Per TTL driven input (control input only); A and B pins do not contribute to ICC.
Switching Characteristics over Operating Range
Parameters Description
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
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Conditions(1)
PI3B3245
Com.
Min.
Max.
CL = 50pF
RL = 500Ω
CL = 50pF,
RL = 500Ω,
RL = 500Ω
Units
0.25
ns
1.0
4.0
ns
1.0
4.5
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.
Ordering Information
Part
Pin Package
Te mpe rature
PI3B3245Q
20- Q SO P (Q )
–40°C to +85°C
PI3B3245L
20- TSSO P (L)
–40°C to +85°C
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
3
PS8162D
01/05/00