1
PS7014C 09/2804
Description:
Pericom Semiconductor's PI5C3244 features a set of eight bus
switches which is pinout and function compatible with the
PI74FCT244T, 74F244, and 74ALS/AS/LS 244 8-bit drivers. Two
enable signals (BEn) turn the switches on similar to the enable
signals of the 244. The bus switch creates no additional propagation
delay or ground bounce noise.
BE
1
BE
2
1A, 1B
2A, 2B
H
H
Disconnect
Disconnect
L
H
1A = 1B
Disconnect
H
L
Disconnect
2A = 2B
L
L
1A = 1B
2A = 2B
Truth Table
(1)
Block Diagram
Pin Description
Pin Name
Description
BEn
Bus Output Enable (Active LOW)
A
0
-A
3
Bus A
B
0
-B
3
Bus B
GND
Ground
V
CC
Power
Pin Configuration
PI5C3244
8-Bit, 2-Port Switch
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Features:
Near-Zero propagation delay
5-ohm switches connect inputs to outputs when enabled
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2A Typical)
Ideally suited for notebook applications
Pin compatible with 74 Series 244 logic devices
Packaging (Pb-free & Green available):
20-pin 173-mil wide plastic TSSOP (L)
20-pin 150-mil wide plastic QSOP (Q)
20-pin 300-mil wide plastic SOIC (S)
Note: 1. H = High Voltage Level
L = Low Voltage Level
1B
0
1A
0
1B
1
1A
1
1B
2
1A
2
1B
3
1A
3
BE
1
2B
0
2A
0
2B
1
2A
1
2B
2
2A
2
2B
3
2A
3
BE
2
V
CC
BE
1
1
20
BE
2
2
19
1
B
0
1
A
0
3
18
2
A
3
2
B
3
4
17
1
B
1
1
A
1
5
16
2
A
2
2
B
2
6
15
1
B
2
1
A
2
7
14
2
A
1
2
B
1
8
13
1
B
3
1
A
3
9
12
2
A
0
2
B
0
10
11
GND
PI5C3244
8-Bit, 2-Port Switch
2
PS7014C 09/2804
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Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature ................................................................. 65C to +150C
Ambient Temperature with Power Applied ................................. 40C to +85C
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
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 specifica-
tion is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reli-
ability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= 40C to +85C, V
CC
= 5V 5%)
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
V
IH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
V
V
IL
Input LOW Voltage
Guaranteed Logic LOW Level
0.5
0.8
V
I
IH
Input HIGH Current
V
CC
= Max., V
IN
= V
CC
1
A
I
IL
Input LOW Current
V
CC
= Max., V
IN
= GND
1
A
I
OZH
High Impedance Output Current
0
A, B
V
CC
1
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18 mA
0.7
1.2
V
I
OS
Short Circuit Current
(3)
A (B) = 0V, B (A) = V
CC
100
mA
V
H
Input Hysteresis at Control Pins
150
mV
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48 mA
5
7
ohm
V
CC
= Min., V
IN
= 2.4V,
I
ON
= 15 mA
10
15
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ
Max.
Units
C
IN
Input Capacitance
V
IN
= 0V
6
pF
C
OFF
A/B Capacitance, Switch Off
V
IN
= 0V
6
pF
C
ON
A/B Capacitance, Switch On
V
IN
= 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, T
A
= 25C 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.
PI5C3244
8-Bit, 2-Port Switch
3
PS7014C 09/2804
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= GND or V
CC
0.1
3.0
A
Supply Current
I
CC
Supply Current per
V
CC
= Max.
V
IN
= 3.4V
(3)
2.5
mA
Input @ TTL HIGH
I
CCD
Supply Current per
V
CC
= Max.,
0.25
mA/
Input per MHz
(4)
A and B Pins Open
MHz
BE
1
or BE
2
= 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, +25C ambient.
3. Per TTL driven input (V
IN
= 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.
Switching Characteristics over Operating Range
PI5C3244
Com.
Parameters Description
Conditions
(1)
Min
Max
Unit
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF
0.25
ns
t
PHL
Ax to Bx
R
L
= 500ohm
t
PZH
Bus Enable Time
1.5
5.6
ns
t
PZL
BE
X
to Ax or Bx
t
PHZ
Bus Disable Time
1.5
5.2
ns
t
PLZ
BE
X
to Ax or Bx
Notes:
1. See test circuit and wave forms.
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.
PI5C3244
8-Bit, 2-Port Switch
4
PS7014C 09/2804
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.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
.150
.157
1
20
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.19
0.41
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.058
1.47
.015 x 45
0.38
REF
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0-6
.008
.013
0.20
0.33
.252
.260
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.238
.269
1
20
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
6.4
6.6
0.65
0.19
0.30
.007
.012
Max
Packaging Mechanical: 20-Pin QSOP (Q)
Packaging Mechanical: 20-Pin TSSOP (L)
PI5C3244
8-Bit, 2-Port Switch
5
PS7014C 09/2804
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1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Packaging Mechanical: 20-Pin SOIC(S)
.272
.295
.078
.002
SEATING
PLANE
.0098
Max.
.0256
BSC
.022
.037
.004
.009
.291
.322
1
20
.197
.220
0.25
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.050
7.40
8.20
0.55
0.95
0.09
0.25
5.00
5.60
2.00
6.90
7.50
0.65
Max
Min
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Ordering Information
Ordering Code
Package Code
Package Type
PI5C3244Q
Q
20-pin QSOP
PI5C3244QE
Q
Pb-free & Green, 20-pin QSOP
PI5C3244L
L
20-pin TSSOP
PI5C3244LE
L
Pb-free & Green, 20-pin TSSOP
PI5C3244S
S
20-pin SOIC
PI5C3244SE
S
Pb-free & Green, 20-pin SOIC
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
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