PI2BV3877 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 2.5V, 10-Bit, 2-Port 266 MHz DDR BusSwitch Product Features Product Description Used in X4 DDR modules Pericom Semiconductors PI2B series of logic circuits are produced using the Companys 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 A09 B09 GND VCC Description Bus Enable Input (Active LOW) Bus A Bus B Ground Power Function Disconnect Connect BE0 H L A0A4 Hi-Z B04 Function Disconnect Connect BE1 H L A5A9 Hi-Z B5B9 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 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 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