21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245
8-Bit, 2-Port Bus Switch
Product Features
Near zero propagation delay
5Ω switches connect inputs to outputs
Direct bus connection when switches are on
Ultra Low Quiescent Power (0.2µA 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 (5Ω) 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).
Logic Block Diagram
Product Pin Configuration
A
0
B
0
A
7
B
7
NC
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
GND
1
2
3
4
20-Pin
L20
5
P20
6
Q20
7
S20
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
BE
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
BE
Truth Table
Function
Disconnect
Connect
(1)
Product Pin Description
BE
H
L
A
0–7
Hi-Z
B
0–7
Pin Name
BE
A
0
–
7
B
0
–
7
GND
V
CC
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
Note:
1. H
= High Voltage Level
L
= Low Voltage Level
Hi-Z = High Impedance
1
PS7015A
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245
8-Bit, 2-Port Bus 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 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
= –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
= 48mA
V
CC
= Min., V
IN
= 2.4V, I
ON
= 15mA
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
= –18mA
A (B) = 0V, B (A) = V
CC
100
150
5
10
7
15
–0.7
Min.
2.0
–0.5
0.8
±1
±1
±1
–1.2
Typ
(2)
Max.
Units
V
V
µA
µA
µA
V
mA
mV
Ω
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
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 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.
5. This parameter is determined by device characterization but is not production tested.
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI5C3245
8-Bit, 2-Port Bus 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)
Test Conditions
(1)
V
CC
= Max.
V
CC
= Max.
V
CC
= Max.,
A and B Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
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
1
2
mA
mA/
MHz
3
4
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 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.
5
6
7
8
Switching Characteristics over Operating Range
(1)
Parameters Description
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
(2,3)
Ax to Bx, Bx to Ax
Bus Enable Time
BE to Ax or Bx
Bus Disable Time
BE to Ax or Bx
Conditions
PI5C3245
Com.
Min.
Max.
0.25
1.5
1.5
6.5
5.5
Units
C
L
= 50pF
R
L
= 500Ω
ns
9
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.
10
11
12
Ordering Information
P/N
PI5C3245Q
PI5C3245S
Package
20 - Q SO P (Q 20)
20 - SO IC (Q 20)
Width
150- mil
300- mil
13
14
15
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
3
PS7015A
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Embedded System
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EEWORLD
