PERICOM PI2BV3877Q

PI2BV3877
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2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
Product Features
Product Description
• Used in X4 DDR modules
Pericom Semiconductor’s PI2B series of logic circuits are produced
using the Company’s advanced submicron CMOS technology,
achieving industry leading performance.
• Near zero propagation delay
• 20 Ohm switches connect inputs to outputs
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 (BEN) input signals.
• Fast Switching Speed –3ns (max.)
• Low Off Capacitance (3pF)
• Pull-down on B output
• Pull-up on Switch Enable
The PI2BV3877 switch is intended for 266 MHz DDR(X4) Memory
Module Applications.
• Packages available:
– 24-pin 150 mil wide plastic QSOP (Q)
– 24-pin 173 mil wide plastic TSSOP (L)
Product Pin Configuration
Logic Block Diagram
A0
B0
A4
BE0
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
GND
B4
Vcc
BE0
A5
B5
A9
B9
1
24
2
23
3
22
4
21
5
6
24-Pin
Q, L
20
19
7
18
8
17
9
16
10
15
11
14
12
13
VCC
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
BE1
Vcc
Truth Table(1)
BE1
Product Pin Description
Pin Name
BE0, BE1
A0–9
B0–9
GND
VCC
Description
Bus Enable Input (Active LOW)
Bus A
Bus B
Ground
Power
Function
Disconnect
Connect
BE0
H
L
A0–A4
Hi-Z
B0–4
Function
Disconnect
Connect
BE1
H
L
A5–A9
Hi-Z
B5–B9
Notes: 1. H = High Voltage Level
L = Low Voltage Level
Hi-Z = High Impedance
1
PS8472A
05/02/00
PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
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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 +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 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, TA = 0°C to +85°C, VCC = 2.3V to 2.7V)
Parameters Description
Test Conditions(1)
Min.
Typ.(2)
Max.
Units
VIH
Input HIGH Voltage (BE0, BE1)
Guaranteed Logic HIGH Level
1.6
VCC+ 0.3
VIL
Input LOW Voltage (BE0, BE1)
Guaranteed Logic LOW Level
–0.3
0.9
IOZH
High Impedance Output Current B @ 2.5V
250
µA
VIK
Clamp Diode Voltage
VCC = Min., IIN = –18mA
–1.2
V
RON
Switch On Resistance(4)
VCC = Min., VIN = 0.9V, ION = 20mA
17
33
VCC = Min., VIN = 1.6V, ION = 15mA
22
30
150
200
RPU
Pull-up Resistance
115
V
Ω
Capacitance (TA = 25°C, f = 1 MHz)
Parameters(4)
Description
Test Conditions
Typ.
Units
pF
CIN
COFF
Input Capacitance
A Capacitance, Switch Off
VIN = 0V
VIN = 0V
3
3
CON (A/B)
A/B Capacitance, Switch On
VIN = 0V
7
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 = 2.5V, TA = 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.
Power Supply Characteristics
Parameters Description
ICC
Quiescent Power
Supply Current
Test Conditions(1)
VCC = Max.
Min.
Typ.(2)
Max.
Units
–
–
10
56
µA
mA
VIN = VCC
VIN = GND
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at VCC = 2.5V, +25°C ambient.
3. Per TTL driven input (control input only); A and B pins do not contribute to ICC.
2
PS8472A
05/02/00
PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
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Switching Characteristics over Operating Range
PI2BV3877
Parame te rs
Conditions (2,3)
De s cription
M in.
tPLH
tPHL
Propagation Delay(2,3)
Ax to Bx, Bx to Ax
tPZH
tPZL
Bus Enable Time
BE to Ax or Bx
tPHZ
tPLZ
Bus Disable Time
BE to Ax or Bx
Units
Com.
M ax.
1
CL = 30pF,
RL = 500Ω,
R = 500Ω
1
3
1
3.5
1
3
1
3.8
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 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.
Parameter Measurements
500Ω
From Output
Under Test
CL = 30pF
(See note 1)
S1
2xVCC
Open
GND
500Ω
Output
Control
(Low Level
Enabling)
LOAD CIRCUIT
VCC
VCC/2
VCC/2
Input
Output
Waveform 1
S1 at 2xVCC
(see Note 2)
0V
tPLH
tPHL
Output
Waveform 2
S1 at GND
(see Note 2)
VOH
Output
VCC/2
VCC/2
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
Te s t
S1
tPD
O pen
tPLZ/tPZL
2xVCC
tPHZ/tPZH
GND
VCC
VCC/2
VCC/2
0V
tPZL
tPLZ
VOH
VCC/2
VOL +0.15V
tPZH
VOL
tPHZ
VOH
VCC/2
VOH -0.15V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
Notes:
1. CL 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, ZO = 50Ω, tR ≤ 2ns, tF ≤ 2ns.
4. The outputs are measured one at a time with one transition per measurement.
5. tPLZ and tPHZ are the same as tDIS.
6. tPZL and tPZH are the same as tEN.
7. tPLH and tPHL are the same as tPD.
3
PS8472A
05/02/00
PI2BV3877
2.5V, 10-Bit, 2-Port
266 MHz DDR BusSwitch
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24-pin QSOP (Q)
24
.150
.157
3.81
3.99
.015 x 45˚
0.38
1
.337
.344
.005
.010
8.56
8.74
0.406
0.914
.016
.036
.033
0.84
.053
.069
1.35
1.75
SEATING
PLANE
.025
typical
0.635
0.127
0.254
.228
.244
5.79
6.20
.004 0.101
.010 0.254
.008 0.203
.012 0.305
X.XX DENOTES DIMENSIONS
X.XX IN MILLIMETERS
24-pin TSSOP (L)
24
.169
.177
1
4.3
4.5
.303
.311
7.7
7.9
.004
.008
.047
1.20
Max
.0256
BSC
0.65
.002
.006
.007
.012
0.19
0.30
0.45
0.75
SEATING
PLANE
0.09
0.20
.018
.030
.252
BSC
6.4
0.05
0.15
X.XX DENOTES CONTROLLING
X.XX DIMENSIONS IN MILLIMETERS
Ordering Information
Part
Pin-Package
PI2BV3877Q
24 - QSOP(Q )
PI2BV3877L
24 - TSSOP(L)
Te mpe rature
0°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
4
PS8472A
05/02/00