PI74ALVCH16269 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs Product Features Product Description • PI74ALVCH16269 is designed for low voltage operation Pericom Semiconductor’s PI74ALVCH series of logic circuits are produced using the Company’s 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 = 25°C • Typical VOHV (Output VOH Undershoot) < 2.0V at VCC = 3.3V, TA = 25°C • Bus Hold retains last active bus state during 3-State, eliminating the need for external pullup resistors • Industrial operation at 40°C to +85°C • Packages available: 56-pin 240 mil wide plastic TSSOP (A) 56-pin 300 mil wide plastic SSOP (V) The PI7ALVCH16269 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 DRAM’s 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. Because OE is 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. 1 PS8379 04/16/99 PI74ALVCH16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Truth Tables(1) Product Pin Description Pin Name OE CLK SEL CLKEN A,1B,2B GND VCC Inputs Description Output Enable Input (Active LOW) Clock Select (Active Low) Clock Enable (Active Low) 3-State Outputs Ground Power 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) Product Pin Configuration INPUTS OEA OEB1 1 2 56 55 OEB2 CLKENA2 2B3 3 4 5 54 53 52 2B4 H H GND L 6 7 8 51 50 49 2B6 VCC 2B7 9 10 48 47 2B8 GND 2B2 2B1 VCC A1 A2 A3 GND A4 A5 A6 11 46 12 56-PIN 45 13 A56 44 A7 14 15 A8 16 A9 17 GND 18 A10 A11 19 V56 43 42 41 2B5 2B9 2B10 1B 2B X X 1B0(2) 2B0(2) X ↑ L L X L X ↑ H H X X L ↑ L X L X L ↑ H X H B to A STORAGE (OEA = L) Inputs 1B12 1B11 20 21 38 37 36 1B9 1B8 35 34 33 VCC 1B6 1B2 22 23 24 GND 1B3 25 26 32 31 GND 1B4 NC 27 28 30 29 CLKENA1 SEL A 2B11 2B12 1B10 VCC 1B1 CLK GND 40 39 A12 CLKENA1 CLKENA2 OUTPUTS GND 1B7 1B5 CLK SEL 1B 2B Outputs A X H X X A0(2) X L X X A0(2) ↑ H L X L ↑ H Η X H ↑ L X L L ↑ L X H H 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. CLK 2 PS8379 04/16/99 PI74ALVCH16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Note: Storage Temperature ................................................ 65°C to +150°C Stresses greater than those listed under MAXIMUM Supply Voltage Range, VCC ................................................. 0.5V to 4.6V RATINGS may cause permanent damage to the device. Input Voltage Range,VI: Except This is a stress rating only and functional operation of the I/O ports(1) ................................................................................ 0.5V to 4.6V device at these or any other conditions above those indicated in the operational sections of this specification I/O ports(1,2) ............................................................... 0.5V to VCC + 0.5V (1,2) is not implied. Exposure to absolute maximum rating Output Voltage Range, VO .............................. 0.5V to VCC + 0.5V conditions for extended periods may affect reliability. 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 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 = –40°C to +85°C, VCC = 3.3V ±10%) Parame te rs De s cription Te s t Conditions M in. Typ. VCC Supply Voltage VIH(1) Input HIGH Voltage VIL(1) Input LOW Voltage VIN(1) Input Voltage 0 VCC VOUT(1) Output Voltage 0 VCC IOH(1) HIGH- level Output Current IOL(1) LOW- level Output Current 2.3 M ax. VCC = 2.3V to 2.7V 1.7 VCC = 2.7V to 3.6V 2.0 3.6 VCC = 2.3V to 2.7V 0.7 VCC = 2.7V to 3.6V 0.8 VCC = 2.3V - 12 VCC = 2.7V - 12 VCC = 3.0V - 24 VCC = 2.3V 12 VCC = 2.7V 12 VCC = 3.0V 24 TA Operating Free- Air Temperature At/∆V Input Transition Rise or Fall Rate - 40 Units V mA 85 ºC 10 ns/V Note: 1. Unused control inputs must be held HIGH or LOW to prevent them from floating. 3 PS8379 04/16/99 PI74ALVCH16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 DC Electrical Characteristics-Continued (Over the Operating Range, TA = -40ºC to +85ºC, VCC = 3.3V ±10% Parame te rs VCC(1) M in. Min. to Max. VCC - 0.2 2.3V 2.0 2.3V 1.7 2.7V 2.2 3.0V 2.4 IOH = - 24mΑ 3.0V 2.0 IOL= 100µΑ Min. to Max. 0.2 IOL = 6mΑ 2.3V 0.4 2.3V 0.7 2.7V 0.4 IOL = 24mΑ 3.0V 0.55 VI = VCC or GND 3.6V ±5 Te s t Conditions IOH = - 100µΑ IOH = - 6mΑ VOH VOL II IOH = - 12mΑ IOL = 12mΑ VI = 0.7V VI = 1.7V II (Hold)(3) VI = 0.8V VI = 2.0V IOZ(4) ICC ∆ΙCC Typ.(2) M ax. V 45 2.3V - 45 3.0V 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 µΑ 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, +25ºC 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 PS8379 04/16/99 PI74ALVCH16269 12-Bit to 24-Bit Registered Bus Exchanger with 3-State Outputs 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 Timing Requirements over Operating Range Parame te rs fCLOCK tW tSU tH D e s cription VCC = 2.5V ± 0.2V VCC = 2.7V VCC = 3.3V ± 0.3V M in. M in. M in. M ax. Clock frequency 135 Pulse duration, CLK High or Low Setup time Hold time M ax. 135 3.3 3.3 3.3 A data before CLK↑ 2.0 2.0 1.7 B data before CLK↑ 2.2 2.1 1.8 SEL before CLK↑ 1.6 1.6 1.3 CLK ENA1 or CLK ENA2 before CLK ↑ 1.0 1.2 0.9 O E data before CLK ↑ 1.5 1.6 1.3 A data after CLK↑ 0.7 0.6 0.6 B data after CLK↑ 0.7 0.6 1.6 SEL after CLK↑ 1.1 0.7 0.7 CLK ENA1 or CLK ENA2 after CLK ↑ 1.0 0.8 1.1 O E after CLK↑ 0.8 0.8 0.8 M ax. Units 135 MHz ns Switching Characteristics over Operating Range(1) Parame te rs From (INPUT) To (OUTPUT) M in.(2) M ax. 135 fMAX tPD tEN VCC = 2.5V ± 0.2V CLK tDIS VCC = 2.7V M in.(2) M ax. VCC = 3.3V ± 0.3V M in.(2) 135 Units M ax. 135 B 1.0 8.2 7.3 1.0 6.2 A 1.0 6.4 5.8 1.0 5.0 B 1.0 7.9 6.7 1.0 6.1 A 1.0 7.6 6.2 1.0 5.9 B 1.0 8.1 6.9 1.0 6.1 A 1.0 7.5 6.8 1.0 5.6 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 = 25°C Parame te r CPD Power Dissipation Capacitance per Exchanger Outputs Enabled Outputs Disabled Te s t Conditions VCC = 2.5V ± 0.2V VCC = 3.3V ± 0.3V Typical CL= 0pF, F = 10 MHz Units 87 120 80.5 118 pF Pericom Semiconductor Corporation 2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com 5 PS8379 04/16/99