ETC PI5C32X383B

PI5C32X383/PI5C32X2383
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20-Bit Bus Switch/Exchange
Product Features
Product Description
• Near-zero propagation delay
• Low noise, 25ohm version (PI5C32X2383)
• 5 ohm switches connect inputs to outputs (PI5C32X383)
• Direct bus connection when switches are ON
• Ultra-low quiescent power (0.2µA typical)
– Ideally suited for notebook applications
• Packages available:
– 48-pin 240-mil wide thin plastic TSSOP (A)
– 48-pin 150-mil wide plastic QSOP (B)
Pericom Semiconductor’s PI5C series of logic circuits are pro-duced
in the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
The PI5C32X383 and PI5C32X2383 are 20-bit bus switches with
exchange 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, and the Bus
Exchange (BX) input signal offers nibble swapping of the AB and
CD pairs of signals. This exchange configuration allows byte
swapping of buses in systems. It can also be used as a quad
2-to-1 multiplexer and to create low delay barrel shifters, etc. The
PI5C32X2383 is designed with an internal 25ohm resistor reducing
noise reflection in high-speed applications.
Product Pin Configuration
BE1
C0
A0
B0
D0
C1
A1
B1
D1
C2
A2
GND
BE2
C5
A5
B5
D5
C6
A6
B6
D6
C7
A7
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48-Pin
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
D4
B4
A4
C4
D3
B3
A3
C3
D2
B2
BX1
VCC
D9
B9
A9
C9
D8
B8
A8
C8
D7
B7
BX2
Applications
10-wide 2:1 MUX, Byte Swapping, and Hot Insertion.
Truth Table(1)
Function
Disconnect
Connect
Exchange
BEN
H
L
L
BXn
X
L
H
A0-A9
Hi-Z
C0-C9
D0-D9
B0-B9
Hi-Z
D0-D9
C0-C9
Note: 1. H = High Voltage Level, X = Don’t Care,
L = Low Voltage Level, Hi-Z = High Impedance
Logic Block Diagram
A0
C0
A5
C5
B0
D0
B5
D5
A4
C4
A9
C9
B4
D4
B9
D9
Product Pin Description
Pin Name
Description
BEn
BXn
Ax
Bx
Cx
Dx
GND
VCC
Bus Enable Input (Active LOW)
Bus Exchange Input
Bus A
Bus B
Bus C
Bus D
Ground
Power
BX1
BE1
BX2
BE2
1
PS8100
07/10/97
PI5C32X383/PI5C32X2383
20-Bit
Bus Switch/Exchange
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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 +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 ....................................................................................... 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 = 5V ±5%)
Parameters Description
Test Conditions(1)
Min.
Typ(2)
Max.
Units
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
—
—
V
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
–0.5
—
0.8
V
IIH
Input HIGH Current
VCC = Max., VIN = VCC
—
—
±1
µA
IIL
Input LOW Current
VCC = Max., VIN = GND
—
—
±1
µA
IOZH
High Impedance Output Current
0 ­ AB, CD ­ VCC
—
—
±1
µA
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
—
–0.7
–1.2
V
IOS
Short Circuit Current(3)
AB (CD) = 0V, CD (AB) = VCC
100
—
—
mA
VH
Input Hysteresis at Control Pins
—
150
—
mV
RON
Switch On Resistance
(4)
VCC = Min., VIN = 0.0V,
ION = 48mA
PI5C3383
PI5C32383
—
18
5
28
7
40
ohm
VCC = Min., VIN = 2.4V,
ION = 15mA
PI5C3383
PI5C32383
—
18
10
35
15
48
ohm
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
Test Conditions
Typ
Max.
Units
CIN
COFF
Input Capacitance
AB/CD Capacitance, Switch Off
VIN = 0V
VIN = 0V
—
—
6
6
pF
pF
CON
AB/CD 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.
2
PS8100
07/10/97
PI5C32X383/PI5C32X2383
20-Bit
Bus Switch/Exchange
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Power Supply Characteristics
Test Conditions(1)
Parameters Description
Min.
Typ(2)
Max.
Units
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
—
0.1
3.0
µA
∆ICC
Supply Current per
Input @ TTL HIGH
VCC = Max.
VIN = 3.4V(3)
—
—
2.5
mA
ICCD
Supply Current per
Input per MHz(4)
VCC = Max.,
AB and CD Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
—
—
0.25
mA/
MHz
Notes:
1. For Max. or Min. conditions, 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, B, C, and D 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, B, C, and D inputs generate no significant AC or DC currents as they transition. This parameter is not tested,
but is guaranteed by design.
PI5C32X383 Switching Characteristics over Operating Range
Parameters Description
t PLH
t PHL
tPZH
tPZL
tPHZ
tPLZ
tBX
Propagation Delay(2,3)
Ax to Cx, Bx to Dx
Bus Enable Time
BE to Cx or Dx
Bus Disable Time
BE to Cx or Dx
Bus Exchange Time
BX to Cx or Dx
PI5C32X383
Com
Typ
Max.
Conditions(1)
Min.
CL = 50pF
RL = 500ohm
—
0.25
—
1.5
—
6.5
1.5
—
5.5
1.5
—
6.5
Units
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
PS8100
07/10/97
PI5C32X383/PI5C32X2383
20-Bit
Bus Switch/Exchange
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PI5C32X2383 Switching Characteristics over Operating Range
Parameters Description
t PLH
t PHL
tPZH
tPZL
tPHZ
tPLZ
tBX
Propagation Delay(2,3)
Ax to Cx, Bx to Dx
Bus Enable Time
BE to Cx or Dx
Bus Disable Time
BE to Cx or Dx
Bus Exchange Time
BX to Cx or Dx
PI5C32X2383
Com
Typ
Max.
Conditions(1)
Min.
CL = 50 pF
RL = 500ohm
—
1.25
—
1.5
—
6.5
1.5
—
5.5
1.5
—
6.5
Units
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
0.25 ns for 50 pF 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
4
PS8100
07/10/97