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PI2BV3877
2.5V, 10-Bit, 2-Port 266 MHz DDR BusSwitch
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)
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 (BEN) input signals. The PI2BV3877 switch is intended for 266 MHz DDR(X4) Memory Module Applications.
Logic Block Diagram
) *
Product Pin Configuration
BE0 A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 GND
1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21
)" 8?? *- )#
*"
24-Pin Q, L
20 19 18 17 16 15 14 13
*#
)' 8??
*'
VCC B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BE1
Truth Table(1)
*-
Function Disconnect Connect Function Disconnect Connect BE0 H L BE1 H L A0A4 Hi-Z B04 A5A9 Hi-Z B5B9
Product Pin Description
Pin Name BE0, BE1 A09 B09 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power
1
Notes: 1. H = High Voltage Level L = Low Voltage Level Hi-Z = High Impedance
PS8472A 05/02/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2BV3877 2.5V, 10-Bit, 2-Port 266 MHz DDR BusSwitch
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 +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 = 0C to +85C, VCC = 2.3V to 2.7V)
Parameters Description VIH VIL IOZH VIK RON RPU Input HIGH Voltage (BE0, BE1) Input LOW Voltage (BE0, BE1) Clamp Diode Voltage Switch On Resistance(4) Pull-up Resistance Test Conditions(1) Guaranteed Logic HIGH Level Guaranteed Logic LOW Level VCC = Min., IIN = 18mA VCC = Min., VIN = 0.9V, ION = 20mA VCC = Min., VIN = 1.6V, ION = 15mA 115 17 22 150 Min. 1.6 0.3 Typ.(2) Max. VCC+ 0.3 0.9 250 1.2 33 30 200 Units V A V
High Impedance Output Current B @ 2.5V
Capacitance (TA = 25C, f = 1 MHz)
Parameters(4) CIN COFF CON (A/B) Description Input Capacitance A Capacitance, Switch Off A/B Capacitance, Switch On Test Conditions VIN = 0V VIN = 0V VIN = 0V Typ. 3 3 7 Units 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 = 2.5V, TA = 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.
Power Supply Characteristics
Parameters Description ICC Quiescent Power Supply Current Test Conditions(1) VCC = Max. VIN = VCC VIN = GND Min. Typ.(2) - - Max. 10 56 Units A mA
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, +25C ambient. 3. Per TTL driven input (control input only); A and B pins do not contribute to ICC.
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PS8472A
05/02/00
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321 21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI2BV3877 2.5V, 10-Bit, 2-Port 266 MHz DDR BusSwitch
Switching Characteristics over Operating Range
Parame te rs De s cription 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 CL = 30pF, RL = 500, R = 500
PI2BV3877 Conditions (2,3) Com. M in. tPLH tPHL tPZH tPZL tPHZ tPLZ M ax. 1 1 1 1 1 3 3.5 3 3.8 ns Units
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
500 S1 2xVCC Open GND
Te s t tPD tPLZ/tPZL
S1 O pen 2xVCC GND
VCC
From Output Under Test CL = 30pF (See note 1)
500
tPHZ/tPZH
Output Control (Low Level Enabling) Output Waveform 1 S1 at 2xVCC (see Note 2) Output Waveform 2 S1 at GND (see Note 2)
LOAD CIRCUIT
VCC/2 tPZL VCC/2
VCC/2 0V tPLZ VOH VOL +0.15V VOL VOH
VCC Input tPLH VCC/2 VCC/2 0V tPHL VOH Output VCC/2 VCC/2 VOL
tPZH VCC/2
tPHZ VOH -0.15V 0V
VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES
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 = 50, 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
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PI2BV3877 2.5V, 10-Bit, 2-Port 266 MHz DDR BusSwitch
24-pin QSOP (Q)
24
.150 .157
3.81 3.99 .015 x 45 0.38
1 .337 .344 8.56 8.74 .016 .036 .053 .069 1.35 1.75 0.406 0.914 .228 .244 5.79 6.20 .005 .010 0.127 0.254
.033 0.84
SEATING PLANE .004 0.101 .010 0.254
.025 typical 0.635
.008 0.203 .012 0.305
X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS
24-pin TSSOP (L)
24
.169 .177
4.3 4.5
1
.303 .311 7.7 7.9 .047 1.20 Max
.004 .008 0.45 0.75 SEATING PLANE .018 .030
0.09 0.20
.252 BSC 6.4
.0256 BSC 0.65
.007 .012 0.19 0.30
.002 .006
0.05 0.15
X.XX DENOTES CONTROLLING X.XX DIMENSIONS IN MILLIMETERS
Ordering Information
Part PI2BV3877Q PI2BV3877L Pin-Package 24 - QSOP(Q ) 24 - TSSOP(L) Te mpe rature 0C to +85C
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

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