21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3244
8-Bit, 2-Port Switch
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 (0.2µA 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)
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.
Block Diagram
BE
1
1A
0
1A
1
1A
2
1A
3
1B
0
1B
1
1B
2
1B
3
Pin Configuration
BE
1
1
A
0
2
B
3
1
A
1
2
B
2
1
A
2
2
B
1
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
BE
2
1
A
3
2A
0
2A
1
2A
2
2A
3
2B
0
2B
1
2B
2
2B
3
2
B
0
GND
Pin Description
Truth Table
(1)
BE
1
H
L
H
L
BE
2
H
H
L
L
1A, 1B
Disconnect
1A = 1B
Disconnect
1A = 1B
2A, 2B
Disconnect
Disconnect
2A = 2B
2A = 2B
Pin Name
BEn
A
0
-A
3
B
0
-B
3
GND
V
CC
Description
Bus Output Enable (Active LOW)
Bus A
Bus B
Ground
Power
Note:
1. H = High Voltage Level
L = Low Voltage Level
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PI5C3244
8-Bit, 2-Port 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 & 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
= –40°C to +85°C, V
CC
= 5V ±5%)
Parameters Description
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
I
OS
V
H
R
ON
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 Control Pins
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.0V, I
ON
= 48 mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15 mA
Test Conditions
(1)
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
= –18 mA
A (B) = 0V, B (A) = V
CC
–0.7
100
150
5
10
7
15
–1.2
Min.
2.0
–0.5
0.8
±1
±1
±1
V
mA
m
V
ohm
Typ
(2)
Max.
Units
V
V
µA
µA
µA
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
Test Conditions
V
IN
= 0V
V
IN
= 0V
V
IN
= 0V
Typ
Max.
6
6
8
Units
pF
pF
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
= 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.
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PI5C3244
8-Bit, 2-Port Switch
Power Supply Characteristics
Parameters Description
I
CC
∆I
CC
I
CCD
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
1
or BE
2
= 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.
3.0
2.5
0.25
Units
µA
mA
mA/
MHz
1
2
3
4
5
6
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, +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
PI5C3244
Com.
Min
Max
0.25
1.5
1.5
5.6
5.2
7
Unit
ns
ns
ns
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
(2,3)
Ax to Bx
Bus Enable Time
BE
X
to Ax or Bx
Bus Disable Time
BE
X
to Ax or Bx
Conditions
(1)
C
L
= 50 pF
R
L
= 500ohm
8
9
10
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.
11
12
13
14
15
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PI5C3244
8-Bit, 2-Port Switch
Packaging Mechanical: 20-Pin QSOP (Q)
20
.008
0.20
MIN.
.150
.157
3.81
3.99
Guage Plane
.008
.013
0.20
0.33
.010
0.254
1
.337 8.56
.344 8.74
Detail A
.016
.035
0.41
0.89
.041
1.04
REF
0˚-6˚
.058
REF
1.47
.053 1.35
.069 1.75
SEATING
PLANE
.015 x 45˚
0.38
Detail A
.007
.010
.016
.050
0.41
1.27
0.178
0.254
.025
BSC
0.635
.004 0.101
.010 0.254
.008 0.203
.012 0.305
.228
.244
5.79
6.19
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
Packaging Mechanical: 20-Pin TSSOP (L)
20
.169
.177
4.3
4.5
1
.252
.260
6.4
6.6
.004 0.09
.008 0.20
.047
1.20
Max
0.45
0.75
.018
.030
SEATING
PLANE
.238
.269
6.1
6.7
.0256
BSC
0.65
.007
.012
0.19
0.30
.002 0.05
.006 0.15
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
4
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3244
8-Bit, 2-Port Switch
Packaging Mechanical: 20-Pin SOIC(S)
20
1
2
.197
.220
5.00
5.60
1
.272
.295
6.90
7.50
.078
2.00
Max
SEATING
PLANE
.002
Min
0.050
.004
.009
0.09
0.25
3
4
5
6
0.55 .022
0.95 .037
.291
.322
7.40
8.20
.0256
BSC
0.65
.0098
Max.
0.25
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
Ordering Information
Ordering Code
PI5C3244Q
PI5C3244QE
PI5C3244L
PI5C3244LE
PI5C3244S
PI5C3244SE
Package Code
Q
Q
L
L
S
S
Package Type
20-pin QSOP
Pb-free & Green, 20-pin QSOP
20-pin TSSOP
Pb-free & Green, 20-pin TSSOP
20-pin SOIC
Pb-free & Green, 20-pin SOIC
7
8
9
Notes:
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
10
11
12
13
14
15
Pericom Semiconductor Corporation • 1-800-435-2336 • www.pericom.com
5
PS7014C
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Medical Electronics
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