PERICOM PI3C3244

PI3C3244
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2.5V/3.3V, High Bandwidth, Hot Insertion,
8-Bit, 2-Port Bus Switch
Product Description
Product Features
Pericom Semiconductor’s PI3C series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
• Near zero propagation delay
• High Bandwidth (>400 MHz)
• Rail-to-Rail 3.3V or 2.5V Switching
The PI3C3244 features a set of 2.5V or 3.3V 8-bit bus switches,
which is a pinout and function compatible with the P74FCT244T,
74F244, and 74ALS/AS/LS2448-bit drivers. Two enable signals
(BEn) turn the switches on similar to the enable signals of the 244.
The bus switch create no additional propagation delay or ground
bounce noise. It is very useful in switching signals that have high
bandwidth (>400 MHz).
• 5V I/O Tolerant
• 2.5V Supply Voltage Operation
• Permits Hot Insertion
• Pin compatible with 74 series 244 logic devices
• Packages available:
– 20-pin 150 mil wide plastic QSOP (Q)
– 20-pin 173 mil wide plastic TSSOP (L)
Logic Block Diagram
Product Pin Configuration
BE1
1A0
1B0
1A1
1B1
1A2
1B0
1A3
1B1
BE2
2A0
2B0
2A1
2B1
2A2
2B2
2A3
2B3
VCC
BE2
1B0
2A3
1B1
2A2
1B2
2A1
1B3
2A0
Truth Table(1)
Product Pin Description
Pin Name
BEn
A0–7
B0–7
GND
VCC
1
20
2
19
3
18
4 20-Pin 17
5 L,Q 16
6
15
7
14
8
13
9
12
10
11
BE1
1A0
2B3
1A1
2B2
1A2
2B1
1A3
2B0
GND
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
BE1
BE2
1A, 1B
2A, 2B
H
H
Disconnect
Disconnect
L
H
1A = 1B
Disconnect
H
L
Disconnect
2A = 2B
L
L
1A = 1B
2A = 2B
Note:
1. H = High Voltage Level
L = Low Voltage Level
1
PS8149B
12/10/99
PI3C3244
2.5V/3.3V, High Bandwidth,
Hot Insertion, 8-Bit, 2-Port Bus Switch
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Storage Temperature..................................................... –65°C to +150°C
Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied ....................... –40°C to +85°C RATINGS may cause permanent damage to the device.
Supply Voltage to Ground Potential .................................. –0.5V to +4.6V This is a stress rating only and functional operation of the
device at these or any other conditions above those
DC Input Voltage ............................................................... –0.5V to +5.5V
indicated in the operational sections of this specification
DC Output Current ......................................................................... 120mA is not implied. Exposure to absolute maximum rating
Power Dissipation ............................................................................. 0.5W conditions for extended periods may affect reliability.
Test Conditions(1)
Min.
Typ.(2)
Max.
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
–0.5
IIH
Input HIGH Current
VCC = Max., VIN = VCC
±1
IIL
Input LOW Current
VCC = Max., VIN = GND
±1
IOZH
High Impedance Output Current 0 ≤ A, B ≤ VCC
VIK
Clamp Diode Voltage
RON
Switch On
Resistance(4)
2
3
4
DC Electrical Characteristics (Over Operating Range, TA = –40°C to +85°C, VCC = 3.3V ±10%)
Parameters Description
1
0.8
Units
5
V
µA
6
±1
VCC = Min., IIN = –18mA
VCC = Min., VIN = 0.0V, ION = 48mA or 64mA
VCC = Min., VIN = 2.4V, ION = 15mA
–0.73
–1.2
V
5
8
7
15
Ω
7
8
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
Test Conditions
Typ.
Units
CIN
COFF
Input Capacitance
A/B Capacitance, Switch Off
VIN = 0V
VIN = 0V
3.5
5.0
pF
CON
A/B Capacitance, Switch On
VIN = 0V
10.0
9
10
11
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. 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.
12
13
14
15
2
PS8149B
12/10/99
PI3C3244
2.5V/3.3V, High Bandwidth,
Hot Insertion, 8-Bit, 2-Port Bus Switch
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1
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.
260
Units
µA
750
3
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 driven input (control input only); A and B pins do not contribute to ∆ICC.
4
Switching Characteristics over 3.3V Operating Range
Conditions(1)
Parameters Description
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Delay(2,3)
Propagation
Ax to Bx
Bus Enable Time
BE to Ax or Bx
Bus Disable Time
BE to Ax or Bx
PI3C3244
Com.
Min.
Max.
CL = 50 pF,
RL = 500Ω
CL = 50 pF,
RL = 500Ω,
R = 500Ω
5
Units
0.25
1.5
6.5
1.5
5.5
6
ns
7
Switching Characteristics over 2.5V Operating Range
Conditions(1)
Parameters Description
t PLH
t PHL
t PZH
t PZL
t PHZ
tPLZ
(2,3)
Propagation Delay
Ax to Bx
Bus Enable Time
BE to Ax or Bx
Bus Disable Time
BE to Ax or Bx
PI3C3244
Com.
Min.
Max.
CL = 50 pF,
RL = 500Ω
CL = 50 pF,
RL = 500Ω,
R = 500Ω
2
500
8
9
Units
0.25
1.5
9.8
1.5
8.3
10
ns
11
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.
12
13
14
15
3
PS8149B
12/10/99
PI3C3244
2.5V/3.3V, High Bandwidth,
Hot Insertion, 8-Bit, 2-Port Bus Switch
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1
4.0
VCC = 3.3V
3.1V
2.9V
2.7V
2.5V
VOUT, (V)
2.3V
3.8V
3.6V
2
3.4V
3.2V
3.0V
2.8V
3
2.0
4
5
6
0.0
0.0
1.0
3.0
2.0
4.0
5.0
VIN, (V)
7
Output
Voltage
InputVoltage
Voltage over
Supply
Voltages
Output
Voltage
vs.vs.
Input
overVarious
Various
Supply
Voltages
Ordering Information
8
Part
Pin-Package
Te mpe rature
PI3C3244L
20- TSSO P (L)
–40°C to +85°C
PI3C3244Q
20- Q SO P (Q )
–40°C to +85°C
9
10
11
12
13
14
15
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
4
PS8149B
12/10/99