21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16862C
20-Bit, 2-Port Bus Switch
with Undershoot Protection
Features
•
•
•
•
•
Near-Zero propagation delay
5-ohm switches connect inputs to outputs
Undershoot Protection up to –1V
Direct bus connection when switches are ON
32X384 function with flow through pinout make board
layout easier
•
Ultra-low quiescent power (120µA typical)
— ideally suited for notebook applications
•
Industrial operating temperature: –40°C to +85°C
•
Packaging (Pb-free & Green avaliable):
— 48-pin 240-mil wide plastic TSSOP
— 48-pin 150-mil wide plastic BQSOP
Description
Pericom Semiconductor’s PI5C16862C is configured as a 20-bit, 2-
port bus switch designed with a low On-Resistance (5-ohm) 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 PI5C16862C can withstand undershoot of up to –1V.
Block Diagram
Pin Configuration
BE
2
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
BE
4
A
10
A
11
A
12
A
13
A
14
A
15
A
16
A
17
A
18
A
19
GND
1
48
2
47
3
46
4
45
5
44
6
43
7
42
8
41
9
40
10
39
11
48-Pin
38
12
A, B
37
13
36
14
35
15
34
16
33
17
32
18
31
19
30
20
29
21
28
22
27
23
26
24
25
VCC
BE
1
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
V
CC
BE
3
B
10
B
11
B
12
B
13
B
14
B
15
B
16
B
17
B
18
B
19
A
0
B
0
A
4
B
4
BE
1
A
15
B
15
A
19
B
19
BE
4
Truth Table
(1)
Function
Disconnect
Connect
BEx
H
L
A19-A0
Hi- Z
B19- B0
Pin Description
Pin Name
BEx
A19- A0
B19- B0
Bus A
Bus B
De s cription
Bus Enable Inputs (Active LOW)
Note:
1. H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
1
PS8391C
09/15/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16862C
20-Bit, 2-Port Bus Switch
with Undershoot Protection
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
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 condi-
tions for extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5V ±10%)
Parame te rs
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
I
OS
V
H
R
ON
De s cription
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
Clamp Diode Voltage
Short Circuit Current
(3)
Input Hysteresis at Control Pins
Switch ON Resistance
(3)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
Te s t Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max., V
IN
= V
CC
V
CC
= Max., V
IN
= GND
V
CC
= Min., I
IN
= –18mA
A(B) = 0V, B (A) = V
CC
M in.
2.0
–0 . 5
—
—
—
—
100
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
150
5.5
9
M ax.
—
0.8
±1
±1
±1
–1.8
—
—
8
16
V
mA
mV
Ω
µA
Units
V
High Impedance Output Current 0
≤
I
N
, Y
N
≤
V
CC
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parame te rs
(5)
C
IN
C
O FF
C
ON
De s cription
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
Te s t Conditions
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
Typical
6
6
10
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
PS8391C
09/15/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16862C
20-Bit, 2-Port Bus Switch
with Undershoot Protection
Power Supply Characteristics
Parame te rs
I
CC
∆I
CC
I
CCD
De s cription
Quiescent Power
Supply Current
Quiescent Power
Input @ TTL HIGH
Supply Current per
Input per MHz
(4)
V
CC
= Max.
V
CC
= Max.
Te s t Conditions
(1)
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
M in.
Typ.
(2)
120
M ax.
200
2.5
0.25
Units
µA
mA
mA/
MHz
V
CC
= Max., A and B Pin Open
BEx = GND, Control Input Toggling, 50% Duty Cycle
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 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.
Switching Characteristics over Operating Range
PI5C16862C
Parame te rs
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
De s cription
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
= 500
Ω
1.5
1. 5
Conditions
(1)
M in.
Com.
M a x.
0.25
6.5
5.5
ns
Units
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
PS8391C
09/15/04
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C16862C
20-Bit, 2-Port Bus Switch
with Undershoot Protection
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
0.45 .018
0.75 .030
.319
BSC
8.1
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
.0197
BSC
0.50
.007
.010
0.17
0.27
.002
.006
0.05
0.15
Packaging Mechanical: 48-Pin BQSOP (B)
48
.150
.157
3.80
4.00
.228
.244
5.80
6.20
Gauge Plane
.010 0.25
BSC
.386
.394
9.80
10.00
.020
.029
0.50
0.75
1
.015 0.381 x 45˚
.008 0.20
Nom
Nom
.063 1.60
.079
2.0
Max
.002 0.05
.009 0.25
.014 0.356
REF
5˚
.0157 BSC
0.40
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
.0051
.009
0.13
0.23
Ordering Information
Ordering Code
PI5C16862CA
PI5C16862CAE
PI5C16862CB
PI5C16862CBE
Package Code
A
A
B
B
48-pin TSSOP
Pb-free & Green, 48-pin TSSOP
48-pin BQSOP
Pb-free & Green, 48-pin BQSOP
Package Description
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
4
PS8391C
09/15/04
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