PI74ALVCHR16269 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs Product Features Product Description * PI74ALVCHR16269 is designed for low voltage operation Pericom Semiconductors PI74ALVCH series of logic circuits are produced using the Companys advanced 0.5 micron CMOS technology, achieving industry leading speed. * VCC = 2.3V to 3.6V * Hysteresis on all inputs * Typical VOLP (Output Ground Bounce) < 0.8V at VCC = 3.3V, TA = 25C * Typical VOHV (Output VOH Undershoot) < 2.0V at VCC = 3.3V, TA = 25C * All output ports have equivalent 26W series resistors, no external resistors are required * Bus Hold retains last active bus state during 3-State, eliminating the need for external pullup resistors * Industrial operation at 40C to +85C * Packages available: 56-pin 240 mil wide plastic TSSOP (A) 56-pin 300 mil wide plastic SSOP (V) The PI7ALVCHR16269 is used in applications in which two separate ports must be multiplexed onto, or demultiplexed from, a single port. It is particularly suitable as an interface between synchronous DRAMs and high-speed microprocessors. Data is stored on the internal B-port registers on the low-to-high transition of the clock (CLK) input when the appropriate clock-enable (CLKENA) inputs are low. Proper control of these inputs allows two sequential 12-bit words to be presented as a 24-bit word on the B-port. For data transfer in the B-to-A direction, a single storage register is provided. The select (SEL) line selects 1B or 2B data for the A outputs. The register on the A output permits the fastest possible data transfer, thus extending the period during which the data is valid on the bus. The control terminals are registered so that all transactions are synchronous with CLK. Data flow is controlled by the active-low output enables (OEA, OEB1, and OEB2). To ensure the high-impedance state during power up or power down, a clock pulse should be applied as soon as possible and OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. Due to OE being routed through a register, the active state of the outputs cannot be determined prior to the arrival of the first clock pulse. Logic Block Diagram Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. All outputs are designed to sink up to 12mA and include 26-ohm resistors to reduce overshoot and undershoot. 1 PS8372 12/17/99 PI74ALVCHR16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Product Pin Description Pin Name OE CLK SEL CLKEN A,1B,2B GND VCC Truth Tables(1) Description Output Enable Input (Active LOW) Clock Select (Active Low) Clock Enable (Active Low) 3-State Outputs Ground Power Inputs Product Pin Configuration Outputs CLK OEA OEB A 1B,2B H H Z Z H L Z Active L H Active Z L L Active Active A to B STORAGE (OEB = L) INPUTS OEA OEB1 2B3 GND 2B2 1 2 56 55 OEB2 3 4 54 53 52 2B4 51 50 49 2B6 5 2B1 6 VCC A1 7 8 A2 A3 GND A4 A5 A6 A7 A8 A9 GND A10 A11 A12 VCC 1B1 1B2 GND 1B3 NC SEL 9 10 11 12 13 56-Pin 48 A, V 47 46 45 CLK ENA1 CLK ENA2 CLKENA2 GND 2B5 VCC 2B7 2B8 2B9 GND 2B10 44 2B11 14 15 16 43 42 2B12 41 17 18 40 39 1B11 1B10 19 20 21 38 37 36 1B9 22 23 24 35 34 33 VCC 1B6 25 26 32 31 GND 27 28 30 29 1B12 OUTPUTS CLK A 1B 2B L H L L 2B0(2) L H H H 2B0(2) L L L L L L L H H H H L L 1B0(2) L H L H 1B0(2) H H H X X 1B0(2) 2B0(2) B to A STORAGE (OEA = L) Inputs CLK SEL 1B 2B Outputs A 1B8 X H X X A0(2) 1B7 X L X X A0(2) H L X L H X H 1B4 L X L L CLKENA1 L X H H GND 1B5 CLK Notes: 1. H = High Signal Level L = Low Signal Level X = Irrelevant Z = High Impedance = Transition, Low to High 2. Output level before indicated steady state input conditions established 2 PS8372 12/17/99 PI74ALVCHR16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature ................................................ 65C to +150C Supply Voltage Range, VCC ................................................. 0.5V to 4.6V Input Voltage Range,VI: Except I/O ports(1) ................................................................................ 0.5V to 4.6V I/O ports(1,2) ............................................................... 0.5V to VCC + 0.5V Output Voltage Range, VO(1,2) .............................. 0.5V to VCC + 0.5V Input Clamp current, IIK (VI < 0) ............................................ 50mA Output Clamp current, IOK (VO < 0) ....................................... 50mA Continous Output Current, IO .................................................. 50mA Continous Current through each VCC or GND ...................... 100mA Maximum Power Dissipation: A package ........................................................................................ 1W V package .....................................................................................1.4W 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. Notes: 1. The input and output negative-voltage ratings maybe exceeded if the input and outputclamp-current ratings are observed. 2. This value is limited to 4.6V maximum. DC Electrical Characteristics (Over the Operating Range, TA = 40C to +85C, VCC = 3.3V 10%) Parame te rs VCC D e s cription Supply Voltage Input HIGH Voltage VIL(1) Input LO W Voltage VIN M in. 2.3 VIH(1) (1) Te s t Conditions VCC = 2.3V to 2.7V 1.7 VCC = 2.7V to 3.6V 2.0 Typ. M ax. 3.6 VCC = 2.3V to 2.7V 0.7 VCC = 2.7V to 3.6V 0.8 Input Voltage 0 VCC VOUT(1) O utput Voltage 0 VCC IOH(1) HIGH- level O utput Current IOL(1) LO W- level O utput Current Units V 6 8 VCC = 3.0V 12 VCC = 2.3V 6 VCC = 2.7V 8 VCC = 3.0V 12 TA O perating Free- Air Temperature At/DV Input Transition Rise or Fall Rate - 40 mA 85 C 10 ns/V Note: 1. Unused control inputs must be held HIGH or LOW to prevent them from floating. 3 PS8372 12/17/99 PI74ALVCHR16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 DC Electrical Characteristics-Continued (Over the Operating Range, TA = -40C to +85C, VCC = 3.3V 10% VCC(1) M in. Min. to Max. VCC - 0.2 VIH = 1.7V 2.3V 1.9 VIH = 2.0V 2.7V 2.2 VIH = 1.7V 2.3V 1.7 VIH = 2.0V 3.0V 2.4 IOH = - 8m VIH = 2.0V 2.7V 2.0 IOH = - 12m VIH = 2.0V 3.0V 2.0 Parame te rs Te s t Conditions IOH = - 100 IOH = - 4m VOH IOH = - 6m IOL= 100 II 0.2 VIL = 0.7V 2.3V 0.4 VIL = 0.8V 2.7V 0.4 VIL = 0.7V 2.3V 0.55 VIL = 0.8V 3.0V 0.55 IOL = 8m VIL = 0.8V 2.7V 0.6 IOL = 12m VIL = 0.8V 3.0V 0.8 3.6V 5 IOL = 6m VI = VCC or GND VI = 0.7V 2.3V VI = 1.7V II (Hold)(3) VI = 0.8V 3.0V VI = 2.0V IOZ(4) ICC CC M ax. Min. to Max. IOL = 4m VOL Typ.(2) V 45 - 45 75 - 75 VI = 0 to 3.6V 3.6V 500 VO = VCC or GND 3.6V 10 VI = VCC or GND, IO = 0 3.6V 40 3V to 3.6V 750 O ne input at VCC - 0.6V, O ther inputs at VCC or GND Units CI Control Inputs VI = VCC or GND 3.3V 3.5 CIO A or B Ports VO = VCC or GND 3.3V 8.5 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 = 3.3V, +25C ambient and maximum loading. 3. Bus hold maximum dynamic current required to switch the input from one state to another 4. For I/O ports, the IOZ includes the input leakage current. 4 PS8372 12/17/99 PI74ALVCHR16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Timing Requirements over Operating Range Parame te rs D e s cription VCC = 2.7V VCC = 3.3V 0.3V M in. M in. M in. M ax. Clock frequency fCLOCK tW VCC = 2.5V 0.2V 95 Pulse duration, CLK High or Low tSU tH Setup time Hold time M ax. M ax. Units 135 MHz 115 5.2 4.3 3.3 A data before CLK 1.4 1.4 1 B data before CLK 1.6 1.5 1.1 SEL before CLK 0.8 1.1 1.3 CLK ENA1 or CLK ENA2 before CLK 0.8 1 0.8 O E data before CLK 1.7 1.6 1.2 A data after CLK 0.9 0.9 1.2 B data after CLK 0.8 0.6 1 SEL after CLK 1.1 0.8 1.7 CLK ENA1 or CLK ENA2 after CLK 1.4 1 1.6 O E after CLK 0.9 0.8 1.2 ns Switching Characteristics over Operating Range(1) Parame te rs From (Input) To (Output) M in.(2) M ax. 95 fMAX tPD tEN VCC = 2.5V 0.2V CLK tDIS VCC = 2.7V M in.(2) VCC = 3.3V 0.3V M in.(2) M ax. 115 Units M ax. 135 B 2.3 7.7 6.9 2.2 5.8 A 1.9 6.4 5.8 2 5.2 B 2.5 7.7 6.9 2.3 5.8 A 2.2 6.7 6 2.1 5.3 B 3.3 8.1 6.7 2.4 6 A 2.7 8 6.2 2.1 6 ns Notes: 1. Unused control inputs must be held HIGH or LOW to prevent them from floating. 2. Minimum limits are guaranteed but not tested on Propagation Delays. Operating Characteristics, TA = 25C Te s t Conditions Parame te r CPD Power Dissipation Capacitance per Exchanger Outputs Enabled Outputs Disabled CL= 0pF, F = 10 MHz VCC = 2.5V 0.2V VCC = 3.3V 0.3V Typical Units 142 172 115 129 pF Pericom Semiconductor Corporation 2380 Bering Drive * San Jose, CA 95131 * 1-800-435-2336 * Fax (408) 435-1100 * http://www.pericom.com 5 PS8372 12/17/99