1
PS7015A 06/28/99
Function
BE
A
07
Disconnect
H
Hi-Z
Connect
L
B
07
Truth Table
(1)
Note:
1. H
=
High Voltage Level
L
=
Low Voltage Level
Hi-Z =
High Impedance
Logic Block Diagram
Product Pin Description
Pin Name
Description
BE
Bus Enable Input (Active LOW)
A
0
7
Bus A
B
0
7
Bus B
GND
Ground
V
CC
Power
Product Pin Configuration
PI5C3245
8-Bit, 2-Port Bus Switch
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Product Features
Near zero propagation delay
5
switches connect inputs to outputs
Direct bus connection when switches are on
Ultra Low Quiescent Power (0.2A Typical)
Ideally suited for notebook applications
Pin compatible with 74 series 245 logic devices
Packages available:
20-pin 173 mil wide plastic TSSOP (L)
20-pin 300 mil wide plastic PDIP (P)
20-pin 150 mil wide plastic QSOP (Q)
20-pin 300 mil wide plastic SOIC (S)
Product Description
Pericom Semiconductors PI5C series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI5C3245 is a 8-bit, 2-port bus switch designed with a low ON
resistance (5
) 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
(BE) input signal. The pinout is compatible with PI74FCT245T
(Octal Bidirectional Transceiver).
BE
A
7
A
0
B
7
B
0
V
CC
NC
1
20
BE
A
0
2
19
B
0
A
1
3
18
B
1
A
2
4
17
B
2
A
3
5
16
B
3
A
4
6
15
B
4
A
5
7
14
B
5
A
6
8
13
B
6
A
7
9
12
B
7
GND
10
11
20-Pin
L20
P20
Q20
S20
PI5C3245
8-Bit, 2-Port Bus Switch
2
PS7015A 06/28/99
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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 specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may
affect reliability.
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
= 18mA
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
= 48mA
5
7
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
10
15
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
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 V
CC
= 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.
PI5C3245
8-Bit, 2-Port Bus Switch
3
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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 = 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, +25C 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 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
PI5C3245
Com.
Parameters Description
Conditions
(1)
Min.
Max.
Units
t
PLH
Propagation Delay
(2,3)
C
L
= 50pF
0.25
t
PHL
Ax to Bx, Bx to Ax
R
L
= 500
t
PZH
Bus Enable Time
1.5
6.5
ns
t
PZL
BE to Ax or Bx
t
PHZ
Bus Disable Time
1.5
5.5
t
PLZ
BE to Ax or Bx
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.
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
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Ordering Information
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ZIP