21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245
PI3B162245 (25Ω)
Ω
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
Product Description
Product Features
• Near-zero propagation delay
• 5Ω switches connect inputs to outputs
• Fast Switching Speed - 4ns max.
• Permits Hot Insertion
• Pin compatible with 74 series16245
• Operating Vcc Range: 3.0V to 3.6V
• Industrial operating temperature: –40°C to +85°C
• Packages available:
– 48-pin 240 mil wide thin plastic TSSOP (A)
– 48-pin 300 mil wide plastic SSOP (V)
Pericom Semiconductor’s PI3B series of logic circuits are produced
using the Company’s advanced 0.35 micron CMOS technology.
The PI3B16245 and PI3B162245 are 3.3 volt, hot-insertion, 16-bit,
2-port bus switches that are pin compatible with the 74 series 16245
16-bit transceiver. Two enable signals (nBE) turn the switches on
similar to the enable signals of the 16245. The bus switches create
no additional propagational delay or additional ground bounce
noise.
The PI3B162245 device has a built-in 25-ohm series resistor to
reduce noise resulting from reflections, thus eliminating the need
for an external terminating resistor.
Logic Block Diagram
1
A
0
1
B
0
Product Pin Configuration
NC
1
B
0
1
B
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
1
BE
1
A
0
1
A
1
GND
1
A
7
1
B
7
1
B
2
1
B
3
GND
1
A
2
1
A
3
1
BE
V
CC
1
B
4
1
B
5
GND
1
B
6
1
B
7
V
CC
1
A
4
1
A
5
GND
1
A
6
1
A
7
2
A
0
2
A
1
2
A
0
2
B
0
2
B
0
2
B
1
48-Pin
37
A, V
36
35
34
33
32
31
30
29
28
27
26
25
GND
2
B
2
GND
2
A
2
2
A
3
2
A
7
2
B
7
2
B
3
V
CC
2
B
4
2
BE
2
B
5
V
CC
2
A
4
2
A
5
GND
2
B
6
2
B
7
NC
GND
2
A
6
2
A
7
2
BE
Truth Table
(1)
Function
Disconnect
Connect
nBE
H
L
nA
0–7
Hi-Z
nB
0–7
Product Pin Description
Pin Name
nBE
nA
0
-nA
7
nB
0
-nB
7
I/O
I
I/O
I/O
Note:
1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
1
PS8189C
09/13/99
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245/PI3B162245
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
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 ........................ –0°C to +85°C
Supply Voltage Range ........................................................ –0.5V to +4.6V
DC Input Voltage ............................................................... –0.5V to +4.6V
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 indi-
cated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect reliability.
DC Electrical Characteristics
(Over the Operating Range, T
A
= –40°C to +85°C, V
CC
= 3.0V to 3.6V)
Parameters Description
V
IH
V
IL
I
IH
I
IL
I
OZH
V
IK
R
ON
Input HIGH Voltage
Input LOW Voltage
Input HIGH Current
Input LOW Current
High Impedance Output Current
Clamp Diode Voltage
Switch On Resistance
(3)
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
V
CC
= Min., V
IN
= 0.0V,
I
ON
= 48mA
V
CC
= Min., V
IN
= 2.4V,
I
ON
= 15mA
16245
162245
16245
162245
Min.
2.0
–0.5
—
—
—
—
—
20
—
20
Typ
(2)
—
—
—
—
—
–0.7
5
28
10
35
Max.
—
0.8
±1
±1
±1
–1.2
8
40
15
48
Ω
Units
V
V
µA
µA
µA
V
Ω
Capacitance
(T
A
= 25°C, f = 1 MHz)
Parameters
(4)
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
Typ
3.0
8.5
17.0
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
= 3.3V, T
A
= 25°C ambient and maximum loading.
3. 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.
4. This parameter is determined by device characterization but is not production tested.
2
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21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI3B16245/PI3B162245
3.3V, Hot Insertion, 16-Bit, 2-Port BusSwitch
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)
V
CC
= Max.
V
CC
= Max.
V
CC =
Max
.
A and B Pins Open
BE = GND
Control Input Toggling
50% Duty Cycle
Test Conditions
(1)
V
IN
= GND or V
CC
V
IN
= 3.0V
(3)
Min.
Typ
(2)
Max.
10
750
0.25
Units
µA
µA
mA/
MHz
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
= 3.3V, +25°C ambient.
3. Per TTL driven input (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
Com.
Parameters
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Description
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
(1)
C
L
= 50pF 16245
R
L
= 500Ω 162245
C
L
= 50pF, R
L
= 500Ω
C
L
= 50pF, R
L
= 500Ω
Min.
Max.
0.25
1.25
4.5
5.0
Units
1
1
ns
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.
Ordering Information
Part
PI3B16245A
PI3B16245V
Pin Package
48- TSSO P (A48)
48- SSO P (V48)
Te mpe rature
- 40°C to +85°C
- 40°C to +85°C
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
3
PS8189C
09/13/99
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