PI5C16244/162244
16-BIT BUS SWITCH BUFFER
122
PS7024B 09/17/96
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Product Features:
Near-zero propagation delay
5
switches connect inputs to outputs when enabled
Direct bus connection when switches are ON
Ultra-low quiescent power (0.2 A typical)
Ideally suited for notebook applications
Pin compatible with 74 series16244
Industrial operating temperature: 40C to +85C
Packages available:
48-pin 240 mil wide thin plastic TSSOP (A)
48-pin 300 mil wide plastic SSOP (V)
48-pin 150 mil wide plastic BQSOP (B)
Product Description:
Pericom Semiconductor's PI5C series of logic circuits are pro-
duced in the Company's advanced 0.6 micron CMOS technology.
The PI5C16244 and PI5C162244 are 16-bit, 4-port bus switches
that are pin compatible with the 74 series 16244 16-bit driver. Four
enable signals (nBE) turn the switches on similar to the enable
signals of the 16244. The bus switch creates no additional propagation
delay or ground bounce noise.
The PI5C162244 device has a built-in 25-ohm series resistor to
reduce noise because of reflections, thus eliminating the need for an
external terminating resistor.
PI5C16244
PI5C162244 (25
)
16-Bit BusSwitch
Logic Block Diagram
Product Pin Description
Function
nBE
nA
07
Disconnect
H
Hi-Z
Connect
L
nB
07
Truth Table
(1)
Note: 1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Pin Name
I/O
Description
nBE
I
Bus Output Enable
(Active LOW)
nA
0
-nA
7
I/O
Bus A
nB
0
-nB
7
I/O
Bus B
Product Pin Configuration
1B
0
1A
0
1B
1
1A
1
1B
2
1A
2
1B
3
1A
3
1
BE
2B
0
2A
0
2B
1
2A
1
2B
2
2A
2
2B
3
2A
3
2
BE
3B
0
3A
0
3B
1
3A
1
3B
2
3A
2
3B
3
3A
3
3
BE
4B
0
4A
0
4B
1
4A
1
4B
2
4A
2
4B
3
4A
3
4
BE
1
BE
1
1
B
0
2
1
B
1
3
GND
4
1
B
2
5
1
B
3
6
V
CC
7
2
B
0
8
2
B
1
9
GND
10
2
B
2
11
2
B
3
12
3
B
0
13
3
B
1
14
GND
15
3
B
2
16
3
B
3
17
V
CC
18
4
B
0
19
4
B
1
20
GND
21
4
B
2
22
4
B
3
23
4
BE
24
2
BE
48
1
A
0
47
1
A
1
46
GND
45
1
A
2
44
1
A
3
43
V
CC
42
2
A
0
41
2
A
1
40
GND
39
2
A
2
38
2
A
3
37
3
A
0
36
3
A
1
35
GND
34
3
A
2
33
3
A
3
32
V
CC
31
4
A
0
30
4
A
1
29
GND
28
4
A
2
27
4
A
3
26
3
BE
25
48-PIN
A,V,B
PI5C16244/162244
16-BIT BUS SWITCH BUFFER
123
PS7024B 09/17/96
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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 10%)
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
= 18 mA
--
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,
16244
--
5
7
I
ON
= 48 mA
162244
20
28
40
V
CC
= Min., V
IN
= 2.4V,
16244
--
10
15
I
ON
= 15 mA
162244
20
35
48
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(5)
Description
Test Conditions
Typ.
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 Vcc = 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.
PI5C16244/162244
16-BIT BUS SWITCH BUFFER
124
PS7024B 09/17/96
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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
nBE = 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 Vcc = 5.0V, +25C ambient.
3. Per TTL driven input (V
IN
= 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.
PI5C16244 Switching Characteristics over Operating Range
PI5C16244
Com.
Parameters
Description
Conditions
(1)
Min
Max
Unit
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF
--
0.25
ns
t
PHL
xAx to xBx
R
L
= 500
t
PZH
Bus Enable Time
1.5
5.6
ns
t
PZL
X
BE to xAx or xBx
t
PHZ
Bus Disable Time
1.5
5.2
ns
t
PLZ
X
BE to xAx or xBx
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 0.25 ns for 50 pF 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.
PI5C162244 Switching Characteristics over Operating Range
PI5C162244
Com.
Parameters
Description
Conditions
(1)
Min
Max
Unit
t
PLH
Propagation Delay
(2,3)
C
L
= 50 pF
--
1.25
ns
t
PHL
xAx to xBx
R
L
= 500
t
PZH
Bus Enable Time
1.5
5.6
ns
t
PZL
X
BE to xAx or xBx
t
PHZ
Bus Disable Time
1.5
5.2
ns
t
PLZ
X
BE to xAx or xBx
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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