PERICOM PI5C3126C

PI5C3125C
PI5C3126C
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4-Bit BusSwitch with
–2V Undershoot Protection
Product Features
Product Description
• RON is 5ohm typical
Pericom Semiconductor’s PI5C series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
• Undershoot protection on A port only: –2V
• Direct bus connection when switches are ON
The PI5C3125C and PI5C3126C are 5V, 4-bit, 2-port bus switches.
They are intended for PCI Hot-Plug applications. Industry leading
advantages include a propagation delay of 250ps, resulting from its
5-ohm channel resistance and low I/O capacitance. The A-ports
switch data to B outputs and are bidirectional. The PI5C3125C
device has active LOW enables, and the PI5C3126C has active HIGH
enables.
• Industrial Operation Temperature: –40°C to +85°C
• Near zero propagation delay
• Low Channel ON Capacitance: 14pF max.
• Packages available:
– 14-pin 173 mil wide plastic TSSOP (L)
– 14-pin 150 mil wide plastic SOIC (W)
– 16-pin 150 mil wide plastic QSOP (Q)
The A-port can handle up to –2V undershoot when the switch is
disabled.
Applications
• PCI Hot Plugging for live insertion
• Memory bank sharing
PI5C3125C Logic Block Diagram
A0
PI5C3126C Logic Block Diagram
A0
B0
BE0
BE0
A1
A1
B1
A2
B2
B2
BE2
BE2
A3
B1
BE1
BE1
A2
B0
A3
B3
B3
BE3
BE3
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PS8512
03/14/01
PI5C3125C/3126C
4-Bit Bus Switch with
–2V Undershoot Protection
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PI5C3126 14-Pin Configuration
PI5C3125 14-Pin Configuration
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
14-Pin
L,W
14
13
12
11
10
9
8
Vcc
BE3
A3
B3
BE2
A2
B2
BE0
A0
B0
BE1
A1
B1
GND
PI5C3125 16-Pin Configuration
NC
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
8
16-Pin
Q
16
15
14
13
12
11
10
9
14-Pin
L,W
Vcc
BE3
A3
B3
BE2
A2
B2
14
13
12
11
10
9
8
PI5C3126 16-Pin Configuration
Vcc
BE3
A3
B3
BE2
A2
B2
NC
NC
BE0
A0
B0
BE1
A1
B1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Vcc
BE3
A3
B3
BE2
A2
B2
NC
Bn
Hi-Z
Hi-Z
An
V CC
GND
VCC
VCC
16-Pin
Q
Truth Table(1)
Product Pin Description
Pin Name
BEn
BEn
A3-A0
B3-B0
VCC
GND
1
2
3
4
5
6
7
PI5C3125C PI5C3126C
BEn
BEn
An
X*
X
Hi-Z
H
L
Hi-Z
L
H
Bn
Description
Switch Enable (PI5C3125C)
Switch Enable (PI5C3126C)
Bus A
Bus B
Power
Ground
Function
Disconnect
Disconnect
Connect
Notes:
1. H = High Voltage Level, L = Low Voltage Level
HI-Z = High Impedance, X = Don’t Care
* A pull-up resistor should be provided for power-up protection.
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 ............................................................................ 120mA
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.
Power Dissipation ................................................................................ 0.5W
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PS8512
03/14/01
PI5C3125C/3126C
4-Bit Bus Switch with
–2V Undershoot Protection
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DC Electrical Characteristics (Over the Operating Range, TA = –40°C to +85°C, VCC = 5V ± 10%)
Test Conditions(1)
Parameters Description
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
Typ(2)
Max.
Units
V
0.8
V
VCC = Max., VIN = VCC
±1
µA
Input LOW Current
VCC = Max., VIN = GND
±1
µA
IOZH
High Impedance Output Current
0 ≤ A, B ≤ VCC
±1
µA
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
–1.8
V
VUP
Undershoot Protection Voltage(3)
Max Inputs, Undershoot Pulse
Duration <25ns
–2.0
V
RON
Switch On Resistance(4)
VCC = Min., VIN = 0.0V, ION = 48mA
VCC = Min., VIN = 2.4V, ION = 15mA
7
15
ohm
5
10
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(5)
Description
Test Conditions
CIN
COFF
Input Capacitance
A/B Capacitance, Switch Off
CON
A/B Capacitance, Switch On
Typ.
Max.
Units
VIN = 0V
VIN = 0V
6
6
pF
pF
VIN = 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 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.
5. This parameter is determined by device characterization but is not production tested.
Power Supply Characteristics
Test Conditions(1)
Parameters Description
Min.
Typ(2)
Max.
Units
ICC
Quiescent Power
Supply Current
VCC = Max.
VIN = GND or VCC
100
µA
∆ICC
Supply Current per
Input @ TTL HIGH
VCC = Max.
VIN = 3.4V(3)
2.5
mA
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.
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PS8512
03/14/01
PI5C3125C/3126C
4-Bit Bus Switch with
–2V Undershoot Protection
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PI5C3125C Switching Characteristics over Operating Range
PI5C3125C
Com
Parame te rs
D e s cription
tPLH
tPHL
Propagation Delay(2,3)
A to B, B to A
tPZH
tPZL
Bus Enable Time
tPHZ
tPLZ
Bus Disable Time
Conditions
M in.
M ax.
Units
0.25
CL = 50pF
RL = 500ohm
0.5
6.6
0.5
6.0
ns
PI5C3126C Switching Characteristics over Operating Range
PI5C3126C
Com
Parame te rs
De s cription
tPLH
tPHL
Propagation Delay(2,3)
A to B, B to A
tPZH
tPZL
Bus Enable Time
tPHZ
tPLZ
Bus Disable Time
Conditions
M in.
M ax.
Units
0.25
CL = 50pF
RL = 500ohm
0.5
6.6
0.5
6.0
ns
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 0.25ns 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.
Applications Information
Logic Inputs
The logic control inputs can be driven up to +5.5V regardless of the
supply voltage. For example, given a +5.0V supply, BE, maybe driven
LOW to 0V and HIGH to 5.5V. Driving BE Rail-to-Rail minimizes
power consumption.
Power-Supply Sequencing
Proper power-supply sequencing is recommended for all CMOS
devices. Always apply Vcc before applying signals to the input/
output or control pins.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
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PS8512
03/14/01
PI5C3125C/3126C
4-Bit Bus Switch with
–2V Undershoot Protection
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14-Pin SOIC (W)
14
.149
.157
3.78
3.99
.0099
.0196
1
.336
.344
8.55
8.75
.0075
.0098
0-8˚
.0155
.026
0.393
0.660
.053
.068
0.41
1.27
1.35
1.75
REF
0.19
0.25
.016
.050
.2284
.2440
5.80
6.20
SEATING PLANE
.050
BSC
1.27
0.25 x 45˚
0.50
.0040 0.10
.0098 0.25
.013
.020
0.330
0.508
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
16-Pin QSOP (Q)
16
.150
.157
3.81
3.99
.015 x 45° 0.38
1
.007
.010
.189
.197
4.80
5.00
0.178
0.254
0.41 .016
1.27 .050
.008
0.203 REF
.228
.244
5.79
6.19
.053 1.35
.069 1.75
SEATING
PLANE
.025
BSC
0.635
.008
.012
0.203
0.305
.004 0.101
.010 0.254
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
5
PS8512
03/14/01
PI5C3125C/3126C
4-Bit Bus Switch with
–2V Undershoot Protection
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14-Pin TSSOP (L)
14
0.169
0.177
4.3
4.5
1
0.193
0.201
4.90
5.10
0.004 0.09
0.008 0.20
0.45
0.75
0.047
1.20
max.
SEATING
PLANE
0.0256
typical
0.65
0.007
0.012
0.19
0.30
0.018
0.030
0.240
0.264
6.1
6.7
0.002 0.05
0.006 0.15
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
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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PS8512
03/14/01