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Product Features
Fast Switching Speed - 4.5ns max.
Permits Hot Insertion
Near-zero propagation delay
5W switches connect inputs to outputs
Direct bus connection when switches are ON
Ultra-low quiescent power (1.0µA typical)
Ideally suited for notebook applications
Industrial operating temperature: 40°C to +85°C
Packages available:
80-pin 150 mil wide plastic BQSOP (B)
TTL - compatible control of input levels
Logic Block Diagram
A
0
A
7
BE
1
A
8
A
15
BE
2
A
16
A
23
BE
3
A
24
A
31
BE
4
Truth Table
(1)
Function BEn A0–31
Disconnect H Hi-Z
Connect L B0–31
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
B
0
B
7
B
8
B
15
B
16
B
23
B
24
B
31
PI3B34X245
3.3V Hot Insertion
32-Bit, 2-Port Bus Switch
Product Description
Pericom Semiconductors PI3B series of logic circuits are produced
in the companys advanced sub micron CMOS technology.
The PI3B34X245 is a 3.3V, 32-bit, 2-port bus switch. Four enable
signals (BEn) turn the switches on. The bus switch creates no
additional propagational delay or additional ground bounce noise.
Product Pin Configuration
V
NC 1
A
0
2
A
1
3
A
2
4
A
3
5
A
4
6
A
5
7
A
6
8
A
7
9
GND 10
11
NC
A
8
12
A
9
13
A
10
14
A
A
A
A
A
GND
NC 21
A
A
A
A
A
A
A
A
GND 30
NC
A
A
A
A
A
A
A
A
GND
80-PIN
11
15
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
B
16
17
18
19
20
22
23
24
25
26
27
28
29
31
32
33
34
35
36
37
38
39
40
Product Pin Description
Pin Name I/O Description
BEn I Bus Enable Input (Active LOW)
A0-A31 I/O Bus A
B0-B31 I/O Bus B
CC
80
BE1
79
B
0
78
B
1
77
B
2
76
B
3
75
B
4
74
B
5
73
B
6
72
B
7
71
CC
V
70
BE2
69
B
8
68
B
9
67
66
B
10
B
11
65
B
12
64
B
13
63
B
14
62
15
61
B
V
CC
60
BE3
59
B
16
58
B
17
57
B
18
56
B
19
55
B
20
54
B
21
53
B
22
52
B
23
51
CC
V
50
BE4
49
B
24
48
B
25
47
46
B
26
B
27
45
B
28
44
B
29
43
B
30
42
31
41
B
1
PS8335A 02/10/99
Page 2
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
PI3B34X245
3.3V Hot Insertion 32-Bit, 2-Port BusSwitch
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
Power Dissipation ..................................................................................... 0.5W
DC Electrical Characteristics (Over the Operating Range, T
= 40°C to +85°C, VCC = 3.3V ± 10%)
A
sretemaraPnoitpircseDsnoitidnoCtseT.niM.pyT.xaMstinU
V
V
I
V
IH
IL
IH
I
IL
I
OZH
IK
egatloVHGIHtupnIleveLHGIHcigoLdeetnarauG0.2
egatloVWOLtupnIleveLWOLcigoLdeetnarauG
tnerruCHGIHtupnIV
tnerruCWOLtupnIV
CC
CC
tnerruCtuptuOecnedepmIhgiH0≤ B,A ≤ V
egatloVedoiDpmalCV
CC
V,.xaM=
IN
=V
CC
V,.xaM=
IN
CC
I,.niM=
NN
DNG=
= − Am81
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.
V
− 5.0
8.0
1±
Αµ
−8.0
V
V
ON
R
ecnatsiseRnOhctiwS
CC
V
CC
V,.niM=
IN
V,.niM=
IN
I,V0.0=
ON
I,V4.2=
ON
Am84=
Am51=
58
0171
Capacitance (TA = 25°C, f = 1 MHz)
Parameters
CIN Input Capacitance VIN = 0V 3.5 pF
COFF A/B Capacitance, Switch Off VIN = 0V 8.0 pF
CON A/B Capacitance, Switch On VIN = 0V 16.0 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 = 3.3V, 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.
(5)
Description Test Conditions Typ. Units
Ω
2
PS8335A 02/10/99
Page 3
Power Supply Characteristics
PI3B34X245
3.3V Hot Insertion 32-Bit, 2-Port BusSwitch
sretemaraPnoitpircseDsnoitidnoCtseT
I
CC
rewoPtnecseiuQ
tnerruCylppuS
)1(
V
CC
.xaM=VINVroDNG=
CC
.niM.pyT
)2(
0.101
.xaMstinU
µA
reptnerruCylppuS
V
Ι∆
CC
HGIHLTT@tupnI
CC
.xaM=V
IN
=V0.3
)3(
057
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable
device.
2. Typical values are at VCC = 3.3V, +25°C ambient.
3. Per TTL driven input (control input 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
542X43B3IP
sretemaraPnoitpircseDsnoitidnoC
)1(
stinU.moC
.niM.xaM
)3,2(
t
HLP
t
LHP
t
HZP
t
LZP
t
ZHP
t
ZLP
yaleDnoitagaporP
xAotxB,xBotxA
emiTelbanEsuB
xBroxAotEB
emiTelbasiDsuB
xBroxAotEB
C
L
R
L
L
C
R
L
005= Ω
005= Ω
005=R Ω
Fp05=
Fp05=
0.10.4
52.0
sn
0.15.4
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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PS8335A 02/10/99
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