PI5C16861
PI5C162861 (25Ω)
20-Bit, 2-Port Bus Switch
Features
• Near-Zero propagation delay
• 5Ω or 25Ω 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 (0.2 µA typical) – ideally suited
for notebook applications
• Industrial operating temperature: –40°C to +85°C
• Packaging (Pb-free & Green available):
– 48-pin 240-mil wide plastic TSSOP (A)
– 48-pin 300-mil wide plastic SSOP (V)
– 48-pin 150-mil wide plastic BQSOP (B)
Description
Pericom Semiconductor’s PI5C16861 is configured as a 20-bit, 2-
port bus switch designed with a low On-Resistance (5Ω) 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 PI5C162861 device has a built-in 25Ω series resistor to reduce
noise resulting from reflections, thus eliminating the need for an
external terminating resistor.
Pin Configuration
NC
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
NC
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
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
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
Block Diagram
A0
B0
A9
B9
BE1
A10
B10
A19
B19
BE2
Truth Table
(1)
Function
Disconnect
Connect
BE
X
H
L
A19-A0
Hi-Z
B19-B0
Pin Description
Pin Name
BEx
A19-A0
B19-B0
Description
Bus Enable Inputs (Active LOW)
Bus A
Bus B
PS7026E
09/13/04
Note:
1. H = High Voltage Level, L = Low Voltage Level,
Hi-Z = High Impedance
1
PI5C16861/162861
20-Bit, 2-Port Bus Switch
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 & V
CC
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 RAT-
INGS 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 ex-
tended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5V ±10%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
I
ON
V
H
Description
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output
Current
Clamp Diode Voltage
Short Circuit Current
(3)
Input Hysteresis at Con-
trol Pins
V
CC
= Min.,
V
IN
= 0.0V,
R
ON
Switch On-Resistance
(4)
I
ON
= 48mA
V
CC
= Min.,
V
IN
= 2.4V,
I
ON
= 15mA
16861
162861
16861
162861
Test Conditions
(1)
Min.
2.0
–0.5
—
—
—
—
100
—
—
20
—
20
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
=
Max.,
V
IN
= V
CC
V
CC
=
Max.,
V
IN
= GND
0
≤
A, B
≤
V
CC
V
CC
=
Min.,
I
IN
= –18mA
A (B) = 0V, B (A) = V
CC
Typ
(2)
—
—
—
—
—
–0.7
—
150
5
28
10
35
Max.
—
0.8
±1
±1
±1
–1.2
—
—
7
40
15
48
Units
V
µA
V
mA
mV
Ω
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(5)
C
IN
C
OFF
C
ON
Description
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
V
IN
= 0V
Test Conditions
Typ
6
6
8
pF
Units
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V,
T
A
= 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
PS7026E
09/13/04
PI5C16861/162861
20-Bit, 2-Port Bus Switch
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
I
CCD
Description
Quiescent Power
Supply Current
Supply Current per
Input @ TTL HIGH
Supply Current per
Input per MHz(4)
V
CC
=
Max.
V
CC
= Max.
V
CC
= Max., A and B Pins Open
BE
X
= GND, Control Input Toggling
50% Duty Cycle
Test Conditions
(1)
V
IN
= GND
or
V
CC
V
IN
= 3.4V(3)
Min.
Typ
(2)
0.1
Max.
10
2.5
0.25
Units
µA
mA
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 V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V,
control inputs only); A and B pins do not contribute to I
CC
.
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
PI5C16861
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BEx to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
C
L
= 50pF
R
L
= 500Ω
1.5
1.5
Conditions
(1)
Min
Com.
Max
1.25
6.5
5.5
ns
Unit
PI5C162861 Switching Characteristics over Operating Range
PI5C162861
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BEx to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
C
L
= 50pF
R
L
= 500Ω
1.5
1.5
Conditions
(1)
Min
Com.
Max
1.25
6.5
5.5
ns
Unit
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
PS7026E
09/13/04
PI5C16861/162861
20-Bit, 2-Port Bus Switch
Packaging Mechanical: 48-pin TSSOP (A)
48
.236
.244
6.0
6.2
1
.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
.007
.010
0.17
0.27
.002
.006
0.05
0.15
0.45
.018
0.75
.030
.319
BSC
8.1
Packaging Mechanical: 48-pin SSOP (V)
48
.291
.299
7.39
7.59
.395
.420
10.03
10.67
Gauge Plane
.010
0.25
1
.02
0.51
.04
1.01
.620
.630
15.75
16.00
.008
0.20
Nom.
.015
0.381
x 45˚
.025
0.635
.110 2.79
Max
.025 BSC
0.635
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
.008 0.20
.0135 0.34
0-8˚
.008
0.20
.016
0.40
4
PS7026E
09/13/04
PI5C16861/162861
20-Bit, 2-Port Bus Switch
Packaging Mechanical: 48-pin BSQOP (B)
48
.150
.157
3.80
4.00
.228
.244
5.80
6.20
Gauge Plane
1
.386
.394
9.80
10.00
.010 0.25
BSC
.020
.029
0.50
0.75
.015 0.381
x 45˚
.008 0.20
Nom
.014 0.356
REF
Nom
.063 1.60
.079
2.0
Max
.002 0.05
.009 0.25
.0157 BSC
0.40
X.XX
DENOTES DIMENSIONS
X.XX
IN MILLIMETERS
.0051
.009
0.13
0.23
5˚
Ordering Information
Ordering Code
PI5C16861A
PI5C16861AE
PI5C16861V
PI5C16861VE
PI5C16861B
PI5C16861BE
PI5C162861A
PI5C162861AE
PI5C162861V
PI5C162861VE
PI5C162861B
PI5C162861BE
Package Type
A
A
V
V
B
B
A
A
V
V
B
B
Package Description
48-Pin, TSSOP
Pb-free & Green, 48-Pin, TSSOP
48-Pin, SSOP
Pb-free & Green, 48-Pin, SSOP
48-Pin, BQSOP
Pb-free & Green, 48-Pin, BQSOP
48-Pin, TSSOP
Pb-free & Green, 48-Pin, TSSOP
48-Pin, SSOP
Pb-free & Green, 48-Pin, SSOP
48-Pin, BQSOP
Pb-free & Green, 48-Pin, BQSOP
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
2. X = Tape and reel
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
5
PS7026E
09/13/04
京公网安备 11010802033920号
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