PI5C32X2384B [ETC]
Bus Switch ; 总线开关\n
| 型号： | PI5C32X2384B |
| 厂家： | 
ETC |
| 描述： | Bus Switch
|
| 文件： | 总3页 (文件大小：72K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PI5C32X2384
20-Bit Bus Switch with 25Ω Series Resistor
Product Description
Product Features
Pericom Semiconductor’s PI5C series of BusSwitch circuits are
produced in the Company’s advanced sub-micron CMOS
technology, achieving industry leading performance.
• Near-zero propagation delay
• 25Ω series resistor
• 5Ω switches connect inputs to outputs
• Direct bus connection when switches are ON
The PI5C32X2384 is a 20-bit bus switches designed with a low ON
resistance 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. Four bus enable signals are provided, one
for each of the upper and lower five bits of the two 10-bit buses.
There is an internal 25Ω series resistor to reduce noise reflection in
high-speed applications.
• Ultra-low quiescent power 32X2384 (0.2µA typical)
– Ideally suited for notebook applications
• Packages available:
– 48-pin 150-mil wide plastic BQSOP (B)
– 48-pin 240-mil wide plastic TSSOP (A)
Logic Block Diagram
Product Pin Configuration
A0
B0
A5
B5
BE
A
1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VCC
B
A
A
B
0
0
1
1
2
B
A
A
B
19
19
18
18
3
A4
B4
A9
B9
4
5
A15
B15
A10
B10
B
A
A
B
B
2
2
3
3
4
6
B17
A17
A16
B16
B15
48-PIN
A, B
7
8
A19
B19
A14
B14
9
10
11
A
4
A15
BEA
BEB
GND 12
BE
B
BE
C
13
14
15
16
17
18
19
20
21
22
23
VCC
B
A
5
5
B
A
14
14
BEC
BED
A
B
B
A
A
6
6
7
7
8
A13
B13
B12
A12
A11
Truth Table(1)
B
B
A
8
9
9
B
B
A
11
10
10
Function
Disconnect
Connect
Connect
Connect
Function
Disconnect
Connect
Connect
Connect
BEA BEB
B4–B0
B19-B15
Hi-Z
H
L
H
L
H
H
L
L
Hi-Z
A4-A0
Hi-Z
Hi-Z
GND 24
BED
A19-A15
A4-A0 A19-A15
Product Pin Description
BEC BED
B9–B5
Hi-Z
B14-B10
Hi-Z
Pin Name
BEx
A19-A0
B19-B0
GND
Description
Bus Enable Inputs (Active LOW)
Bus A
Bus B
Ground
Power
H
L
H
L
H
H
L
L
A9-A5
Hi-Z
Hi-Z
A14-A10
A9-A5 A14-A10
VCC
Note: 1. H = High Voltage Level, L = Low Voltage Level,
Hi-Z = High Impedance
PS8101C
01/18/99
1
PI5C32X2384
20-Bit Bus Switch
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
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 +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) –0.5V to +7.0V
DC Input Voltage .................................................................. –0.5V to +7.0V
DC Output Current ............................................................................ 120 mA
Power Dissipation................................................................................... 0.5W
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion 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 = 5V ±5%)
Parameters Description
Test Conditions(1)
Min. Typ(2) Max. Units
VIH
VIL
IIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
VCC = Max., VIN = VCC
2.0
—
—
—
—
—
—
20
—
—
—
0.8
±1
±1
±1
—
—
40
V
V
Input LOW Voltage
Input HIGH Current
—
µA
µA
µA
mA
mV
Ω
IIL
Input LOW Current
VCC = Max., VIN = GND
0 - (A,B)(C,D) - VCC
—
IOZH
IOS
VH
High Impedance Output Current
Short Circuit Current(3)
Input Hysteresis at Control Pins
Switch ON Resistance(4)
—
A,B (C,D) = 0V, C,D (A,B) = VCC
300
150
28
RON
VCC = Min., VIN = 0.0V
ION = 48mA
VCC = Min., VIN = 2.4V
ION = 15mA
20
35
48
Ω
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
Test Conditions
Typ
Max.
Units
CIN
Input Capacitance
VIN = 0V
VIN = 0V
—
—
6
6
pF
pF
COFF
A/B Capacitance, Switch Off
CON
A/B Capacitance, Switch On
VIN = 0V
—
8
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 = 5.0V, 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 AB and CD pin at indicated current through the switch. ON resistance is determined by
the lower of the voltages on the two (A or B, C or D) pins.
5. This parameter is determined by device characterization but is not production tested.
PS8101C
01/18/99
2
PI5C32X2384
20-Bit Bus Switch
Power Supply Characteristics
Parameters
Description
Test Conditions(1)
VIN = GND or VCC
Min. Typ(2) Max. Units
ICC
Quiescent Power
Supply Current
VCC = Max.
VCC = Max.
PI5C32X2384
0.1
3.0
µA
∆ICC
Supply Current per
Input @ TTL HIGH
VIN = 3.4V(3)
2.5
mA
ICCD
Supply Current per
Input per MHz(4)
VCC = Max.,
0.25
mA/
MHz
A and B Pins Open
BE1 or BE2 = GND
Control Input Toggling
50% Duty Cycle
Notes:
1. For conditions shown as Max. or Min., use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V, control inputs only); A and B pins do not contribute to Icc.
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.
PI5C32X2384 Switching Characteristics over Operating Range
PI5C32X2384
Parameters Description
Conditions(1)
Min
Typ
Max
Units
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
Propagation Delay(2,3)
CL = 50pF
—
1.25
—
ns
Ax to Bx, Bx to Ax
Bus Enable Time
BEX to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
RL = 500Ω
1.5
1.5
—
—
7.5
5.5
ns
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 1.25ns 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.
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
PS8101C
01/18/99
3
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