ETC PI5C16861CA

PI5C16861C
Ω)
PI5C162861C (25Ω
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20-Bit, 2-Port Bus Switch
Product Features
Product Description
•
•
•
•
Near-zero propagation delay
5-ohm or 25−ohm switches connect inputs to outputs
Direct bus connection when switches are ON
32X384 function with flow through pinout
make board layout easier
• Ultra-low quiescent power (105µA typical)
– ideally suited for notebook applications
• Industrial operating temperature: –40°C to +85°C
• Packages available:
– 48-pin 240-mil wide plastic TSSOP (A)
Pericom Semiconductor’s PI5C series of Bus Switch circuits are
produced using the Company’s advanced submicron CMOS
technology, achieving industry leading speed.
The PI5C16861C is configured as a 20-bit, 2-port bus switch designed
with a low ON resistance (5 ohms) 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 (BEx) input signal.
The PI5C162861C device has a built-in 25-ohm series resistor to
reduce noise resulting from reflections, thus eliminating the need
for an external terminating resistor.
Logic Block Diagram
Product Pin Configuration
A0
B0
A9
B9
NC
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
NC
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
GND
BE1
A10
B10
A19
B19
BE2
Truth Table(1)
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
A
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
BE1
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
VCC
BE2
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
Product Pin Description
Function
nBE
nA0-7
Pin Name
I/O
De s cription
Disconnect
H
Hi- Z
S0- S2
I
Select Inputs
Connect
L
nB0- 7
xAx
I/O
Bus A
xBx
I/O
Bus B
Notes:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
1
PS8357D
05 /10/01
PI5C16861C
PI5C162861C
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20-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:
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.
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
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ±10%)
Parame te rs
Te s t Conditions (1)
D e s cription
M in.
Typ.(2) M ax.
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
—
—
VIL
Input LO W Voltage
Guaranteed Logic LO W Level
–0.5
—
0.8
IIH
Input HIGH Current
VCC = Max., VIN = VCC
—
—
±1
IIL
Input LO W Current
VCC = Max., VIN = GND
—
—
±1
Units
V
µA
IOZH
High Impedance O utput Current 0 ≤ IN, YN ≤ VCC
—
—
±1
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
—
—
–1.8
V
IOS
Short Circuit Current(3)
A(B) = 0V, B(A) = VCC
100
—
—
mA
VH
Input Hysteresis at Control Pins
—
150
—
mV
RON
Switch O N
Resistance(4)
VCC = Min., VIN = 0.0V,
ION = 48mA
16861C
162861C
—
20
5
28
9
40
VCC = Min., VIN = 2.4V,
ION = 15mA
16861C
162861C
—
20
10
35
15
48
Ω
Capacitance (TA = 25°C, f = 1 MHz)
Parame te rs
De s cription
Te s t Conditions
Typ
CIN
Input Capacitance
VIN =0V
6
C O FF
A/B Capacitance, Switch Off
VIN =0V
6
CON
A/B Capacitance, Switch On
VIN =0V
8
Units
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 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.
2
PS8357D
05 /10/01
PI5C16861C
PI5C162861C
20-Bit, 2-Port Bus Switch
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Power Supply Characteristics
Parame te rs
Te s t Conditions (1)
De s cription
M in.
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
∆ICC
Quiescent Power
Input @ TTL HIGH
VCC = Max.
VIN = 3.4V(3)
ICCD
Supply Current per
Input per MHz(4)
VCC = Max., A and B Pin Open
BEx = GND, Control Input Toggling, 50% Duty Cycle
Typ.(2)
M ax.
Units
105
200
µA
2.5
mA
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 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.
PI5C16861 Switching Characteristics over Operating Range
PI5C16861C
Parame te rs
De s cription
Conditions
(1)
Com.
M in.
M ax.
(2,3)
tPLH
tPHL
Propagation Delay
Ax to Bx, Bx to Ax
tPZH
tPZL
Bus Enable Time
BEx to Ax or Bx
tPHZ
tPLZ
Bus Disable Time
BEx to Ax or Bx
Units
0.25
CL = 50pF
RL = 500Ω
1.5
6.5
1.5
5.5
ns
PI5C162861 Switching Characteristics over Operating Range
PI5C162861C
Parame te rs
Conditions (1)
De s cription
Com.
M in.
(2,3)
tPLH
tPHL
Propagation Delay
Ax to Bx, Bx to Ax
tPZH
tPZL
Bus Enable Time
BEx to Ax or Bx
tPHZ
tPLZ
Bus Disable Time
BEx to Ax or Bx
Units
M ax.
1.25
CL = 50pF
RL = 500Ω
1.5
6.5
1.5
5.5
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.
3
PS8357D
05 /10/01
PI5C16861C
PI5C162861C
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20-Bit, 2-Port Bus Switch
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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-toRailR minimizes power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS devices. Always apply VCC before applying signals to the input/
output or control pins.
48 -TSSOP (L) Package
48
.236
.244
1
6.0
6.2
.488 12.4
.496 12.6
.047
1.20 Max
SEATING PLANE
.004 0.09
.008 0.20
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.0197
BSC
0.50
.002
.006
0.05
0.15
.007
.010
0.17
0.27
0.45 .018
0.75 .030
.319
BSC
8.1
Ordering Information
Part
Pin-Package
Te mpe rature
PI5C16861CA
48 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
4
PS8357D
05 /10/01