1
PS8472A 05/02/00
Product Pin Configuration
Product Pin Description
Pin Name
Description
BE0, BE1
Bus Enable Input (Active LOW)
A09
Bus A
B09
Bus B
GND
Ground
V
CC
Power
Function
BE0 A
0A4
Disconnect
H
Hi-Z
Connect
L
B
04
Truth Table
(1)
Notes: 1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
Logic Block Diagram
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PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
Product Description
Pericom Semiconductors PI2B series of logic circuits are produced
using the Companys advanced submicron CMOS technology,
achieving industry leading performance.
The PI2BV3877 is a 10-bit, 2.5 volt two-port bus switch designed with
a low ON resistance 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
N
) input signals.
The PI2BV3877 switch is intended for 266 MHz DDR(X4) Memory
Module Applications.
Product Features
Used in X4 DDR modules
Near zero propagation delay
20 Ohm switches connect inputs to outputs
Fast Switching Speed 3ns (max.)
Low Off Capacitance (3pF)
Pull-down on B output
Pull-up on Switch Enable
Packages available:
24-pin 150 mil wide plastic QSOP (Q)
24-pin 173 mil wide plastic TSSOP (L)
Function
BE1 A
5A9
Disconnect
H
Hi-Z
Connect
L
B
5B9
V
CC
B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
B
9
BE
1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
BE
0
A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
A
9
GND
24-Pin
Q, L
*-
)
"
)
*
"
*
8??
*-
)
'
)
#
*
'
*
#
8??
2
PS8472A 05/02/00
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PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
DC Electrical Characteristics
(Over the Operating Range, T
A
= 0C to +85C, V
CC
= 2.3V to 2.7V)
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
V
IH
Input HIGH Voltage (BE0, BE1) Guaranteed Logic HIGH Level
1.6
V
CC
+ 0.3
V
IL
Input LOW Voltage (BE0, BE1)
Guaranteed Logic LOW Level
0.3
0.9
I
OZH
High Impedance Output Current B @ 2.5V
250
A
V
IK
Clamp Diode Voltage
V
CC
= Min., I
IN
= 18mA
1.2
V
R
ON
Switch On Resistance
(4)
V
CC
= Min., V
IN
= 0.9V, I
ON
= 20mA
17
33
V
CC
= Min., V
IN
= 1.6V, I
ON
= 15mA
22
30
R
PU
Pull-up Resistance
115
150
200
Storage Temperature ...............................................................65C to +150C
Ambient Temperature with Power Applied .............................. 40C to +85C
Supply Voltage to Ground Potential (Inputs & V
CC
Only) ........0.5V to +4.6V
Supply Voltage to Ground Potential (Outputs & D/O Only) ......0.5V to +4.6V
DC Input Voltage .......................................................................0.5V to +4.6V
DC Output Current .................................................................................120mA
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 conditions
for extended periods may affect reliability.
Capacitance
(T
A
= 25C, f = 1 MHz)
Parameters
(4)
Description
Test Conditions
Typ.
Units
C
IN
Input Capacitance
V
IN
= 0V
3
C
OFF
A Capacitance, Switch Off
V
IN
= 0V
3
pF
C
ON
(A/B)
A/B Capacitance, Switch On
V
IN
= 0V
7
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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
= 2.5V, T
A
= 25C 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.
V
Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ.
(2)
Max.
Units
I
CC
Quiescent Power
V
CC
= Max.
V
IN
= V
CC
10
A
Supply Current
V
IN
= GND
56
mA
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
= 2.5V, +25C ambient.
3. Per TTL driven input (control input only); A and B pins do not contribute to I
CC
.
3
PS8472A 05/02/00
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PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
Switching Characteristics over Operating Range
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 1ns 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.
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3
Parameter Measurements
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
t
s
e
T
1
S
t
D
P
n
e
p
O
t
Z
L
P
t/
L
Z
P
V
x
2
C
C
t
Z
H
P
t/
H
Z
P
D
N
G
Notes:
1. C
L
includes probe and jig capacitance.
2. Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is HIGH except when disabled by the output control.
3. All input pulses are supplied by generators having the following characteristics: PRR<10MHz, Z
O
= 50
,
t
R
2ns, t
F
2ns.
4. The outputs are measured one at a time with one transition per measurement.
5. t
PLZ
and t
PHZ
are the same as t
DIS
.
6. t
PZL
and t
PZH
are the same as t
EN
.
7. t
PLH
and t
PHL
are the same as t
PD
.
500
500
GND
2xV
CC
Open
S1
LOAD CIRCUIT
From Output
Under Test
C
L
= 30pF
(See note 1)
Input
t
PLH
t
PHL
V
CC
V
CC
/2
V
CC
/2
V
CC
/2
V
CC
/2
0V
Output
V
OH
V
OL
t
PZL
Output
Control
(Low Level
Enabling)
0V
V
CC
/2
V
CC
/2
V
CC
/2
V
CC
/2
t
PLZ
t
PHZ
V
OL
V
OH
0V
t
PZH
+0.15V
-0.15V
Output
Waveform 1
S1 at 2xV
CC
(see Note 2)
Output
Waveform 2
S1 at GND
(see Note 2)
V
OH
V
OH
V
OL
V
CC
4
PS8472A 05/02/00
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PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
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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7
7
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3
V
B
2
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2
Ordering Information
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
typical
.005
.010
.228
.244
1
24
.150
.157
.016
.036
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.20
0.406
0.914
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.127
0.254
.033
0.84
0.38
.015 x 45
.303
.311
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.252
BSC
1
24
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.4
0.45
0.75
0.09
0.20
4.3
4.5
7.7
7.9
0.65
0.19
0.30
.007
.012
Max
24-pin QSOP (Q)
24-pin TSSOP (L)
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