Revised April 2000 GTLP8T306 8-Bit LVTTL/GTLP Bus Transceiver General Description Features The GTLP8T306 is an 8-bit bus transceiver that provides LVTTL to GTLP signal level translation. The device provides a high speed interface between cards operating at LVTTL logic levels and a backplane operating at GTLP logic levels. High speed backplane operation is a direct result of GTLP’s reduced output swing (<1V), reduced input threshold levels and output edge rate control. The edge rate control minimizes bus settling time. GTLP is a Fairchild Semiconductor derivative of the Gunning Transceiver logic (GTL) JEDEC standard JESD8-3. ■ Bidirectional interface between GTL/GTLP and LVTTL logic levels Fairchild’s GTLP has internal output edge-rate control and is process, voltage, and temperature (PVT) compensated. Its function is similar to BTL and GTL but with different output levels and receiver thresholds. The GTLP output LOW level is typically less than 0.5V, the output HIGH level is 1.5V and the receiver threshold is 1.0V. ■ Output Edge Rate Control to minimize noise on the GTLP port ■ Power up/down/off high impedance for live insertion ■ Standard 245 function ■ CMOS technology for low power dissipation ■ 5V tolerant inputs and outputs on the A-Port ■ Bus-hold data inputs on the A-Port eliminates the need for external pull-up resistors on unused inputs ■ LVTTL compatible driver and control inputs ■ Flow through pinout optimizes PCB layout ■ Open drain on GTLP to support wired-or connection ■ A-Port source/sink −24 mA/+24 mA ■ B-Port sink 50 mA ■ Recommended Operating Temperature −40°C to +85°C Ordering Code: Order Number Package Number Package Description GTLP8T306MTC MTC24 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Logic Symbol © 2000 Fairchild Semiconductor Corporation Connection Diagram DS500051 www.fairchildsemi.com GTLP8T306 8-Bit LVTTL/GTLP Bus Transceiver September 1997 GTLP8T306 Pin Descriptions Pin Names Truth Table Description Inputs Output OE Output Enable (Active LOW) OE T/R T/R Transmit/Receive Input H X A0–A7 Side A Inputs or 3-STATE Outputs L L Bus B Data to Bus A B0–B7 Side B Inputs or 3-STATE Outputs L H Bus A Data to Bus B VREF GTLP Reference Voltage HIGH Z on Bus A and Bus B Functional Description The GTLP8T306 is an 8-bit transceiver providing the standard 245 functionality that supports both GTL and GTLP signal levels. Data polarity is non-inverting and the data flow direction is controlled by the T/R pin. The outputs are enabled to allow data through the device when OE is LOW otherwise both the A and B ports are placed in a HIGH impedance state. Logic Diagram www.fairchildsemi.com 2 Supply Voltage (VCC) −0.5V to 7.0V DC Input Voltage (VI) −0.5V to +7.0V Recommended Operating Conditions (Note 3) Outputs 3-STATE Outputs Active (Note 2) DC Output Sink Current into A-Port IOL Bus Termination Voltage (VTT) −0.5V to +7.0V −0.5V to 7.0V 48 mA −48 mA +50 mA ESD Rating Storage Temperature (TSTG) +24 mA A-Port +50 mA B-Port −40°C to +85°C Operating Temperature (TA) DC Output Diode Current (IOK) −50 mA −24 mA A-Port −50 mA VO > VCC 0V to 5.5V LOW Level Output Current (IOL) 100 mA VO < 0V 1.14V to 1.26V and control pins DC Input Diode Current (IIK) VI < 0V 1.35V to 1.65V GTL HIGH Level Output Current (IOH) DC Output Sink Current into B-Port in the LOW State, IOL GTLP Input Voltage (VI) on A-Port DC Output Source Current from A-Port IOH 3.15V to 3.45V Supply Voltage VCC DC Output Voltage (VO) Note 1: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum rating. The “Recommended Operating Conditions” table will define the conditions for actual device operation. >2000V −65°C to +150°C Note 2: IO Absolute Maximum Rating must be observed. Note 3: Unused inputs must be held high or low. 3 www.fairchildsemi.com GTLP8T306 Absolute Maximum Ratings(Note 1) GTLP8T306 DC Electrical Characteristics Over Recommended Operating Free-Air Temperature Range, VREF = 1.0V (unless otherwise noted). Symbol VIH VIL Test Conditions Min B-Port VREF +0.05 Others 2.0 B-Port 0.0 Typ (Note 4) VTT GTLP 1.0 GTL 0.8 VIK VOH VOL A-Port A-Port B-Port II VCC = 3.15V II = −18 mA VCC = Min to Max (Note 5) IOH = −100 µA VCC −0.2 VCC = 3.15V IOH = −12 mA 2.4 IOH = −24 mA 2.0 V VCC = 3.15V IOL = 24 mA 0.5 VCC = 3.15V IOL = 40 mA 0.4 IOL = 50 mA 0.55 V VCC = 3.45V VI = 5.5V 20 VI = 0V −20 Control Pins VCC = 3.45V VI = 5.5V 5 VI = 0V −5 VI = VTT 5 VI = 0 −5 100 VI or VO = 0 to 4.5V II (Hold) A-Port VCC = 3.15V VI = 0.8V 75 VI = 2.0V −20 A-Port VCC = 3.45V B-Port V µA µA µA µA µA VO = 3.45V 20 VO = 1.5V 5 A-Port VCC = 3.45V VO = 0 −20 B-Port VCC = 3.45V VO = 0.55 −5 A or B Ports VCC = 3.45V Outputs HIGH 7 18 Outputs LOW 8 20 VI = V CC or GND Outputs Disabled 8 20 One Input at VCC–0.6V 0 1 IO = 0 ICC A-Port and VCC = 3.45V (Note 6) Control Pins A or Control Inputs at VCC or GND CIN Control Pins VI = VCC or 0 5 A-Port VI = VCC or 0 7 B-Port VI = VCC or 0 9 µA µA mA mA Note 4: All typical values are VCC = 3.3V and T A= 25°C. Note 5: For conditions shown as Min, use the appropriate value specified under recommended operating conditions. Note 6: This is the increase in supply current for each input that is at the specified LVTTL voltage level rather than VCC or GND. www.fairchildsemi.com V V 0.2 VCC = 0 ICC V IOL = 100 µA A-Port IOZL V −1.2 IOFF IOZH V 0.8 VCC = Min to Max (Note 5) VCC = 3.45V V VREF −0.05 A-Port B-Port Units V Others VREF Max 4 pF Over recommended range of supply voltage and operating free air-temperature, VREF = 1.0V (unless otherwise noted). CL = 30 pF for B-Port and CL = 50 pF for A-Port. Symbol tPLH From (Input) To (Output) Min Typ (Note 7) Max An Bn 1.0 4.0 7.5 1.0 5.1 7.5 1.0 5.8 8.3 1.0 4.9 8.3 ns tPHL tPLH Units Bn An ns tPHL tRISE Transition Time, B Outputs (20% to 80%) 2.6 ns tFALL Transition Time, B Outputs (20% to 80%) 2.6 ns tRISE Transition Time, A Outputs (10% to 90%) 2.5 ns tFALL Transition Time, A Outputs (10% to 90%) tPZH, tPZL 2.5 OE An 4.5 9.5 1.0 4.9 9.5 1.0 5.4 9.5 1.0 6.0 9.5 ns tPHZ, tPLZ tPLH ns 1.0 OE Bn ns tPHL Note 7: All typical values are at VCC = 3.3V and TA = 25°C. 5 www.fairchildsemi.com GTLP8T306 AC Electrical Characteristics GTLP8T306 Test Circuit and Timing Waveforms Test Circuit for A Outputs Test Circuit for B Outputs Voltage Waveforms Enable and Disable Times A-Port Voltage Waveforms Pulse Duration (VM = VCC/2 for A-Port and 1.0 for B-Port) Voltage Waveforms Propagation Delay and Setup and Hold Times (VM = VCC/2 for A-Port and 1.0 for B-Port) Note A: CL includes probes and Jig capacitance. Note B: For B-Port, CL = 30 pF is used for worst case. www.fairchildsemi.com 6 GTLP8T306 8-Bit LVTTL/GTLP Bus Transceiver Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead Thin Shrink Small Outline Package, JEDEC MO-153, 4.4mm Wide Package Number MTC24 Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. www.fairchildsemi.com 7 www.fairchildsemi.com