Pericom Semiconductor’s PI5C3244 features a set of eight bus
switches which is pinout and function compatible with the PI74F-
CT244T, 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.
Near-Zero propagation delay
5-ohm switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra Low Quiescent Power (0.2μA typical)
à
Ideally suited for notebook applications
Pin compatible with 74 Series 244 logic devices
Packaging (Pb-free & Green):
à
20-pin 173-mil wide plastic TSSOP (L)
à
20-pin 150-mil wide plastic QSOP (Q)
Block Diagram
BE1
1A0
1A1
1A2
1A3
BE2
2A0
2A1
2A2
2A3
2B0
2B1
2B2
2B3
1B0
1B1
1B2
1B3
Pin Configuration
BE
1
1
A
0
2
B
3
1
A
1
2
B
2
1
A
2
2
B
1
1
A
3
2
B
0
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
BE
2
1
B
0
2
A
3
1
B
1
2
A
2
1
B
2
2
A
1
1
B
3
2
A
0
GND
Truth Table
(1)
BE1
H
L
H
L
Note: 1.
Pin Description
1A, 1B
Disconnect
1A = 1B
Disconnect
1A = 1B
BE2
H
H
L
L
H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
2A, 2B
Disconnect
Disconnect
2A = 2B
2A = 2B
Pin Name
BEn
A0-A3
B0-B3
GND
V
CC
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
All trademarks are property of their respective owners.
11-0025
1
www.pericom.com
PS8140F
10/12/10
8-Bit, 2-Port Bus Switch
Absolute Maximum Ratings
Parameter
Storage Temperature
Ambient Temperature with Power Applied
Supply Voltage to Ground Potential (Inputs & Vcc Only)
Supply Voltage to Ground Potential (Outputs & D/O Only)
DC Input Voltage
DC Output Current
Power Dissipation
Stress beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
PI5C3244
Min.
-65
-40
-0.5
-0.5
-0.5
-
-
Max.
150
85
7.0
7.0
7.0
120
0.5
Units
o
o
C
C
V
V
V
mA
W
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 5V ±5%)
Parameters
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
I
OS
V
H
R
ON
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.
Description
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
(4)
Test 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
V
CC
= Min, V
IN
= 0.0V, I
ON
= 48 mA
V
CC
= Min, V
IN
= 2.4V, I
ON
= 15 mA
Min
2.0
-0.5
Typ
(2)
Max
0.8
±1
±1
±1
Units
V
V
μA
μA
μA
V
mA
mV
High Impedance Output Current 0 ≤ A, B ≤ V
CC
-0.7
100
150
5
10
-1.2
7
15
Ω
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(1)
C
IN
C
OFF
C
ON
Notes:
1. This parameter is determined by device characterization but is not production tested.
Description
Input Capacitance
A/B Capacitance, Switch Off
A/B Capacitance, Switch On
Test Conditions
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
Typ
6
6
12
Units
pF
pF
pF
All trademarks are property of their respective owners.
11-0025
2
www.pericom.com
PS8140F
10/12/10
8-Bit, 2-Port Bus Switch
Power Supply Characteristics
Parameters
I
CC
ΔI
CC
PI5C3244
Description
Quiescent Power Supply
V
CC
= Max.
Current
Supply Current @ Input
V
CC
= Max.
HIGH
Supply Current per
Input per MHz
(4)
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= 3.4V
(3)
Min
Typ
(2)
0.1
Max
3.0
2.5
Units
μA
mA
I
CCD
V
CC
= Max.
A and B Pins Open
BE1 or BE2 = 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 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 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
Com.
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
Propagation Delay
(1,2)
Ax to Bx
Bus Enable Time
BEx to Ax or Bx
Bus Disable Time
BEx to Ax or Bx
Test Conditions
Min
Max
0.25
Units
C
L
= 50 pF
R
L
= 500Ω
1.5
1.5
5.6
5.2
ns
Notes:
1. This parameter is guaranteed but not tested on Propagation Delays.
2. The bus switch contributes no propagational delay other than the RC delay of the On-Resistance of the switch and the load ca-
pacitance. 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.
All trademarks are property of their respective owners.
11-0025
3
www.pericom.com
PS8140F
10/12/10
8-Bit, 2-Port Bus Switch
Packaging Mechanical: 20-pin TSSOP (L20)
DOCUMENT CONTROL NO.
PD - 1311
PI5C3244
20
REVISION: E
DATE: 03/09/05
.169
.177
4.3
4.5
1
.252
.260
6.4
6.6
.004
0.09
.008
0.20
.047
1.20
Max
SEATING
PLANE
0.45
0.75
.018
.030
1
.238
.269
6.1
6.7
.0256
BSC
0.65
.007
.012
0.19
0.30
.002
0.05
.006
0.15
Note:
1. Package Outline Exclusive of Mold Flash and Metal Burr
2. Controlling dimentions in millimeters
3. Ref: JEDEC MO-153F/AC
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2336 • www.pericom.com
DESCRIPTION: 20-Pin, 173-Mil Wide, TSSOP
PACKAGE CODE: L
All trademarks are property of their respective owners.
11-0025
4
www.pericom.com
PS8140F
10/12/10
8-Bit, 2-Port Bus Switch
Packaging Mechanical: 20-pin QSOP (Q20)
DOCUMENT CONTROL NO.
PD - 1202
PI5C3244
20
REVISION: H
.008
0.20
MIN.
DATE: 10/22/07
.008
.013
0.20
0.33
.150
.157
3.81
3.99
Guage Plane
1
.337 8.56
.344 8.74
.010
0.254
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.058
REF
1.47
1
.053 1.35
.069 1.75
SEATING
PLANE
.015 x 45˚
0.38
Detail A
.007
.010
0.178
0.254
.025
BSC
0.635
.008
0.203
.012
0.305
.004 0.101
.010 0.254
.228
.244
5.79
6.19
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2335
• www.pericom.com
DESCRIPTION:
20-Pin, 150-Mil
Wide, QSOP
PACKAGE CODE: Q
Note:
1) Controlling dimensions in inches.
2) Ref:
JEDEC MO-137B/AD
3) Dimensions do not include mold flash, protrusions or gate burrs
Ordering Information
Ordering Code
PI5C3244LEX
PI5C3244QEX
Package Code
L
Q
Package Type
Pb-free & Green, 20-pin TSSOP
Pb-free & Green, 20-pin QSOP
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
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