Datasheet

PI5C3244
8-Bit, 2-Port Bus Switch
Features
Description
ÎÎNear-Zero propagation delay
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.
ÎÎ5-ohm switches connect inputs to outputs
ÎÎDirect bus connection when switches are ON
ÎÎUltra Low Quiescent Power (0.2μA typical)
àà Ideally suited for notebook applications
ÎÎPin compatible with 74 Series 244 logic devices
ÎÎPackaging (Pb-free & Green):
àà 20-pin 173-mil wide plastic TSSOP (L)
àà 20-pin 150-mil wide plastic QSOP (Q)
Pin Configuration
Block Diagram
BE1
1A0
1B0
1A1
1B1
1A2
1B2
1A3
1B3
BE1
1A0
2B3
1A1
1
20
VCC
2
3
4
19
18
17
BE2
1B0
2A3
2B2
5
6
7
16
15
14
1B1
8
9
10
13
12
11
2A1
1A2
2B1
BE2
1A3
2A0
2B0
2A1
2B1
2A2
2B2
2A3
2B3
2B0
GND
2A2
1B2
1B3
2A0
Pin Description
Truth Table(1)
BE1
BE2
1A, 1B
2A, 2B
Pin Name
H
H
Disconnect
Disconnect
BEn
L
H
1A = 1B
Disconnect
A0-A3
Bus A
H
L
Disconnect
2A = 2B
B0-B3
Bus B
L
L
1A = 1B
2A = 2B
GND
Ground
Note: 1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
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VCC
11-0025
1
Description
Bus Enable Input (Active LOW)
Power
www.pericom.com
PS8140F
10/12/10
PI5C3244
8-Bit, 2-Port Bus Switch
Absolute Maximum Ratings
Parameter
Min.
Max.
Units
Storage Temperature
-65
150
o
C
Ambient Temperature with Power Applied
-40
85
o
C
Supply Voltage to Ground Potential (Inputs & Vcc Only)
-0.5
7.0
V
Supply Voltage to Ground Potential (Outputs & D/O Only)
-0.5
7.0
V
DC Input Voltage
-0.5
7.0
V
DC Output Current
-
120
mA
Power Dissipation
-
0.5
W
Stress beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ±5%)
Parameters
Description
Test Conditions(1)
Min
VIH
Input HIGH Voltage
Guaranteed Logic HIGH Level
2.0
VIL
Input LOW Voltage
Guaranteed Logic LOW Level
-0.5
IIH
Input HIGH Current
IIL
Input LOW Current
IOZH
High Impedance Output Current 0 ≤ A, B ≤ VCC
VIK
Clamp Diode Voltage
VCC = Min, IIN = -18mA
-0.7
IOS
Short Circuit Current(3)
A (B) = 0V, B (A) = VCC
100
VH
Input Hysteresis at Control Pins
RON
Switch On Resistance(4)
Typ (2)
Max
Units
V
0.8
V
VCC = Max., VIN = VCC
±1
μA
VCC = Max., VIN = GND
±1
μA
±1
μA
-1.2
V
mA
150
mV
VCC = Min, VIN = 0.0V, ION = 48 mA
5
7
VCC = Min, VIN = 2.4V, ION = 15 mA
10
15
Ω
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, TA = 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.
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(1)
Description
Test Conditions
Typ
Units
CIN
Input Capacitance
VIN = 0V
6
pF
COFF
A/B Capacitance, Switch Off
VIN = 0V
6
pF
CON
A/B Capacitance, Switch On
VIN = 0V
12
pF
Notes:
1. This parameter is determined by device characterization but is not production tested.
All trademarks are property of their respective owners.
11-0025
2
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PS8140F
10/12/10
PI5C3244
8-Bit, 2-Port Bus Switch
Power Supply Characteristics
Parameters
Description
ICC
Quiescent Power Supply
VCC = Max.
Current
VIN = GND or VCC
ΔICC
Supply Current @ Input
VCC = Max.
HIGH
VIN = 3.4V(3)
ICCD
Supply Current per
Input per MHz(4)
Test Conditions(1)
Min
Typ (2)
Max
Units
0.1
3.0
μA
2.5
mA
0.25
mA/
MHz
VCC = Max.
A and B Pins Open
BE1 or BE2 = 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 VCC = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 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
Description
tPLH
tPHL
Propagation Delay(1,2)
Ax to Bx
tPZH
tPZL
Bus Enable Time
BEx to Ax or Bx
tPHZ
tPLZ
Bus Disable Time
BEx to Ax or Bx
Test Conditions
Min
Max
Units
0.25
CL = 50 pF
R L = 500Ω
1.5
5.6
1.5
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 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.
All trademarks are property of their respective owners.
11-0025
3
www.pericom.com
PS8140F
10/12/10
PI5C3244
8-Bit, 2-Port Bus Switch
Packaging Mechanical: 20-pin TSSOP (L20)
DOCUMENT CONTROL NO.
PD - 1311
20
REVISION: E
DATE: 03/09/05
.169
.177
1
.252
.260
6.4
6.6
.004 0.09
.008 0.20
.047
1.20
Max
1
.0256
BSC
0.65
4.3
4.5
.007
.012
0.19
0.30
0.45
0.75
SEATING
PLANE
.238
.269
6.1
6.7
.002 0.05
.006 0.15
Pericom Semiconductor Corporation
3545 N. 1st Street, San Jose, CA 95134
1-800-435-2336 • www.pericom.com
Note:
1. Package Outline Exclusive of Mold Flash and Metal Burr
2. Controlling dimentions in millimeters
3. Ref: JEDEC MO-153F/AC
All trademarks are property of their respective owners.
.018
.030
11-0025
DESCRIPTION: 20-Pin, 173-Mil Wide, TSSOP
PACKAGE CODE: L
4
www.pericom.com
PS8140F
10/12/10
PI5C3244
8-Bit, 2-Port Bus Switch
Packaging Mechanical: 20-pin QSOP (Q20)
DOCUMENT CONTROL NO.
PD - 1202
20
REVISION: H
.008
0.20
MIN.
.150
.157
3.81
3.99
DATE: 10/22/07
.008
.013
0.20
0.33
Guage Plane
.010
0.254
1
Detail A
.337 8.56
.344 8.74
0˚-6˚
.016
.035
0.41
0.89
.041
1.04
REF
.058 REF
1.47
.015 x 45˚
0.38
.053 1.35
.069 1.75
Detail A
1
SEATING
PLANE
.025
BSC
0.635
.004 0.101
.010 0.254
.008 0.203
.012 0.305
.007
.010
0.178
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
Note:
1) Controlling dimensions in inches.
2) Ref: JEDEC MO-137B/AD
3) Dimensions do not include mold flash, protrusions or gate burrs
DESCRIPTION: 20-Pin, 150-Mil Wide, QSOP
PACKAGE CODE: Q
Ordering Information
Ordering Code
Package Code
Package Type
PI5C3244LEX
L
Pb-free & Green, 20-pin TSSOP
PI5C3244QEX
Q
Pb-free & Green, 20-pin QSOP
1. Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
Pericom Semiconductor Corporation • 1-800-435-2336
All trademarks are property of their respective owners.
11-0025
5
www.pericom.com
PS8140F
10/12/10