SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 D D D D D D D D D D D D TI-OPC Circuitry Limits Ringing on Unevenly Loaded Backplanes OEC Circuitry Improves Signal Integrity and Reduces Electromagnetic Interference Bidirectional Interface Between GTLP Signal Levels and LVTTL Logic Levels Split LVTTL Port Provides a Feedback Path for Control and Diagnostics Monitoring LVTTL Interfaces Are 5-V Tolerant High-Drive GTLP Outputs (100 mA) LVTTL Outputs (–24 mA/24 mA) Variable Edge-Rate Control (ERC) Input Selects GTLP Rise and Fall Times for Optimal Data-Transfer Rate and Signal Integrity in Distributed Loads Ioff, Power-Up 3-State, and BIAS VCC Support Live Insertion Polarity Control Selects True or Complementary Outputs Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II ESD Protection Exceeds JESD 22 – 2000-V Human-Body Model (A114-A) – 200-V Machine Model (A115-A) – 1000-V Charged-Device Model (C101) DGV, DW, OR PW PACKAGE (TOP VIEW) 1Y 1T/C 2Y GND 1OEAB VCC 1A GND 2A 2OEAB 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 1OEBY 2T/C 2OEBY GND 1B ERC 2B GND VREF BIAS VCC description The SN74GTLP1395 is two 1-bit, high-drive, 3-wire bus transceivers that provide LVTTL-to-GTLP and GTLP-to-LVTTL signal-level translation for applications, such as primary and secondary clocks, that require individual output-enable and true/complement controls. The device allows for transparent and inverted transparent modes of data transfer with separate LVTTL input and LVTTL output pins, which provide a feedback path for control and diagnostics monitoring. The device provides a high-speed interface between cards operating at LVTTL logic levels and a backplane operating at GTLP signal levels and is designed especially to work with the Texas Instruments 3.3-V 1394 backplane physical-layer controller. High-speed (about three times faster than standard LVTTL or TTL) backplane operation is a direct result of GTLP reduced output swing (<1 V), reduced input threshold levels, improved differential input, OEC circuitry, and TI-OPC circuitry. Improved GTLP OEC and TI-OPC circuitry minimizes bus settling time, and have been designed and tested using several backplane models. The high drive allows incident-wave switching in heavily loaded backplanes, with equivalent load impedance down to 11 Ω. GTLP is the Texas Instruments derivative of the Gunning Transceiver Logic (GTL) JEDEC standard JESD 8-3. The ac specification of the SN74GTLP1395 is given only at the preferred higher noise margin GTLP, but the user has the flexibility of using this device at either GTL (VTT = 1.2 V and VREF = 0.8 V) or GTLP (VTT = 1.5 V and VREF = 1 V) signal levels. For information on using GTLP devices in FB+/BTL applications, refer to TI application reports, Texas Instruments GTLP Frequently Asked Questions, literature number SCEA019, and GTLP in BTL Applications, literature number SCEA017. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. OEC and TI-OPC are trademarks of Texas Instruments. Copyright 2001, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 description (continued) Normally, the B port operates at GTLP signal levels. The A-port and control inputs operate at LVTTL logic levels, but are 5-V tolerant and are compatible with TTL or 5-V CMOS devices. VREF is the B-port differential input reference voltage. This device is fully specified for live-insertion applications using Ioff, power-up 3-state, and BIAS VCC. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict. The BIAS VCC circuitry precharges and preconditions the B-port input/output connections, preventing disturbance of active data on the backplane during card insertion or removal, and permits true live-insertion capability. This GTLP device features TI-OPC circuitry, which actively limits the overshoot caused by improperly terminated backplanes, unevenly distributed cards, or empty slots during low-to-high signal transitions. This improves signal integrity, which allows adequate noise margin to be maintained at higher frequencies. High-drive GTLP backplane interface devices feature adjustable edge-rate control (ERC). Changing the ERC input voltage between low and high adjusts the B-port output rise and fall times. This allows the designer to optimize system data-transfer rate and signal integrity to the backplane load. When VCC is between 0 and 1.5 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, the output-enable (OE) input 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. GQN PACKAGE (TOP VIEW) 1 2 3 terminal assignments 4 1 2 3 4 A A 1T/C 1Y 1OEBY 2T/C B B GND GND 2Y 2OEBY C C 1OEAB ERC 1B D D VCC GND GND 1A 2B E E 2OEAB 2A BIAS VCC VREF ORDERING INFORMATION TA TOP-SIDE MARKING Tube SN74GTLP1395DW Tape and reel SN74GTLP1395DWR TSSOP – PW Tape and reel SN74GTLP1395PWR GP395 TVSOP – DGV Tape and reel SN74GTLP1395DGVR GP395 VFBGA – GQN Tape and reel SN74GTLP1395GQNR GP395 SOIC – DW –40°C to 85°C ORDERABLE PART NUMBER PACKAGE† GTLP1395 † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 functional description The output-enable (1OEAB, 1OEBY) and polarity-control (1T/C) inputs control 1A, 1B, and 1Y. 2OEAB, 2OEBY, and 2T/C control 2A, 2B, and 2Y. OEAB controls the activity of the B port. When OEAB is low, the B-port output is active. When OEAB is high, the B-port output is disabled. A separate LVTTL A input and Y output provide a feedback path for control and diagnostics monitoring. OEBY controls the Y output. When OEBY is low, the Y output is active. When OEBY is high, the Y output is disabled. T/C selects polarity of data transmission in both directions. When T/C is high, data transmission is true, and A data goes to the B bus and B data goes to the Y bus. When T/C is low, data transmission is complementary, and inverted A data goes to the B bus and inverted B data goes to the Y bus. Function Tables OUTPUT CONTROL INPUTS T/C OEAB OEBY OUTPUT MODE Isolation X H H Z H L H A data to B bus H H L B data to Y bus H L L A data to B bus, B data to Y bus L L H Inverted A data to B bus L H L Inverted B data to Y bus L L L Inverted A data to B bus, Inverted B data to Y bus True transparent True transparent with feedback path Inverted transparent Inverted transparent with feedback path OUTPUT EDGE-RATE CONTROL (ERC) INPUT ERC LOGIC LEVEL OUTPUT B-PORT EDGE RATE H Slow L Fast POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 logic diagram (positive logic) 12 VREF 15 ERC 5 1OEAB 1T/C 1A 2 7 16 1B 20 1OEBY 1Y 1 10 2OEAB 2T/C 2A 19 14 9 18 2OEBY 3 2Y Pin numbers shown are for the DGV, DW, and PW packages. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2B SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC and BIAS VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V Input voltage range, VI (see Note 1): A inputs, ERC, and control inputs . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V B port and VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V Voltage range applied to any output in the high-impedance or power-off state, VO (see Note 1): Y outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 4.6 V Current into any output in the low state, IO: Y outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA B port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mA Current into any output in the high state, IO (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 mA Continuous current through each VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±100 mA Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 mA Package thermal impedance, θJA (see Note 3): DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92°C/W DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58°C/W GQN package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78°C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2. This current flows only when the output is in the high state and VO > VCC. 3. The package thermal impedance is calculated in accordance with JESD 51-7. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 recommended operating conditions (see Notes 4 through 7) VCC, BIAS VCC Supply voltage VTT Termination voltage VREF Reference voltage VI Input voltage VIH High level input voltage High-level VIL Low level input voltage Low-level IIK IOH Input clamp current Low level output current Low-level ∆t/∆v Input transition rise or fall rate ∆t/∆VCC TA Power-up ramp rate NOM MAX UNIT 3.15 3.3 3.45 V GTL 1.14 1.2 1.26 GTLP 1.35 1.5 1.65 GTL 0.74 0.8 0.87 GTLP 0.87 1 1.1 VCC VTT 5.5 B port Except B port B port Except B port VREF+0.05 2 B port V V V V V VREF–0.05 0.8 V –18 mA Y outputs –24 mA Y outputs 24 Except B port High-level output current IOL MIN B port 100 Outputs enabled 10 –40 ns/V µs/V 20 Operating free-air temperature mA 85 °C NOTES: 4. All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. 5. Proper connection sequence for use of the B-port I/O precharge feature is GND and BIAS VCC = 3.3 V first, I/O second, and VCC = 3.3 V last, because the BIAS VCC precharge circuitry is disabled when any VCC pin is connected. The control and VREF inputs can be connected anytime, but normally are connected during the I/O stage. If B-port precharge is not required, any connection sequence is acceptable, but generally, GND is connected first. 6. VTT and RTT can be adjusted to accommodate backplane impedances if the dc recommended IOL ratings are not exceeded. 7. VREF can be adjusted to optimize noise margins, but normally it is two-thirds VTT. TI-OPC is enabled in the A-to-B direction and is activated when VTT > 0.7 V above VREF. If operated in the A-to-B direction, VREF should be set to within 0.6 V of VTT to minimize current drain. 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 electrical characteristics over recommended operating free-air temperature range for GTLP (unless otherwise noted) PARAMETER VIK VOH TEST CONDITIONS VCC = 3.15 V, VCC = 3.15 V to 3.45 V, Y outputs II = –18 mA IOH = –100 µA IOH = –12 mA VCC = 3 15 V 3.15 IOH = –24 mA VCC = 3.15 V to 3.45 V, Y outputs VCC = 3 3.15 15 V VOL B port II‡ IOZ‡ ICC VCC = 3.15 V TYP† MAX UNIT –1.2 V VCC–0.2 2.4 V 2 IOL = 100 µA IOL = 12 mA 0.2 IOL = 24 mA IOL = 10 mA 0.5 0.4 0.2 IOL = 64 mA IOL = 100 mA 0.55 VCC = 3.45 V, VI = 0 to 5.5 V ±10 Y outputs VCC = 3.45 V, VO = 0 to 5.5 V ±10 B port VCC = 3.45 V, VREF within 0.6 V of VTT, ±10 Y outputs or B port VCC = 3.45 V, IO = 0, VI (A or control inputs) = VCC or GND, VI (B port) = VTT or GND VO = 0 to 2.3 V Outputs high Control inputs Co Y outputs Cio B port µA µA 20 Outputs low 20 Outputs disabled 20 VCC = 3.45 V, One A-port or control input at VCC – 0.6 V, Other A-port or control inputs at VCC or GND A-port inputs V 0.4 A-port and control inputs ∆ICC§ Ci MIN 1.5 3 15 V or 0 VI = 3.15 VO = 3.15 V or 0 4 4.5 3.5 5 mA mA pF 5 5.5 pF VO = 1.5 V or 0 7 † All typical values are at VCC = 3.3 V, TA = 25°C. ‡ For I/O ports, the parameter IOZ includes the input leakage current. § This is the increase in supply current for each input that is at the specified TTL voltage level, rather than VCC or GND. 10.5 pF hot-insertion specifications for A inputs and Y outputs over recommended operating free-air temperature range PARAMETER TEST CONDITIONS Ioff IOZPU VCC = 0, VCC = 0 to 1.5 V, VI or VO = 0 to 5.5 V VO = 0.5 V to 3 V, IOZPD VCC = 1.5 V to 0, VO = 0.5 V to 3 V, MIN MAX UNIT 10 µA OEBY = 0 ±30 µA OEBY = 0 ±30 µA live-insertion specifications for B port over recommended operating free-air temperature range PARAMETER TEST CONDITIONS Ioff IOZPU VCC = 0, VCC = 0 to 1.5 V, BIAS VCC = 0, IOZPD VCC = 1.5 V to 0, VCC = 0 to 3.15 V ICC (BIAS VCC) VO IO VCC = 3.15 V to 3.45 V VCC = 0, VCC = 0, MIN BIAS VCC = 0, VI or VO = 0 to 1.5 V VO = 0.5 V to 1.5 V, BIAS VCC = 0, VO = 0.5 V to 1.5 V, BIAS VCC = 3 3.15 15 V to 3 3.45 45 V V, VO (B port) = 0 to 1.5 15V BIAS VCC = 3.3 V, IO = 0 VO (B port) = 0.6 V BIAS VCC = 3.15 V to 3.45 V, POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MAX UNIT 10 µA OEAB = 0 ±30 µA OEAB = 0 ±30 µA 0.95 –1 5 mA 10 µA 1.05 V µA 7 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 switching characteristics over recommended ranges of supply voltage and operating free-air temperature, VTT = 1.5 V and VREF = 1 V for GTLP (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) EDGE RATE† tPLH tPHL A B Slow tPLH tPHL A B Fast tPLH tPHL A Y Slow tPLH tPHL A Y Fast tPLH tPHL T/C B Slow tPLH tPHL T/C B Fast ten tdis OEAB B Slow ten tdis OEAB B Fast tr time B outputs (20% to 80%) Rise time, tf Fall time, time B outputs (80% to 20%) tPLH tPHL B Y tPLH tPHL T/C Y OEBY Y ten tdis † Slow (ERC = H) and Fast (ERC = L) ‡ All typical values are at VCC = 3.3 V, TA = 25°C. 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MIN TYP‡ MAX 3.3 6.3 1.9 6 2.5 5.3 1.6 4.9 3.4 9.7 3.3 9.2 2.9 8.7 2.9 8.1 3.7 6.7 1.8 6.2 1.5 5.6 1.7 5.5 3.8 6.4 1.9 6.1 2.8 5.3 1.5 5 Slow 2.4 Fast 1.3 Slow 3 Fast 2.7 UNIT ns ns ns ns ns ns ns ns ns ns 1.3 5.3 1.4 4.5 1 4.5 1.1 4 1 4.5 1 4.7 ns ns ns SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 skew characteristics over recommended ranges of supply voltage and operating free-air temperature, VREF = 1 V, standard lumped loads (CL = 30 pF for B port and CL = 50 pF for Y port) (unless otherwise noted)(see Figure 1)† FROM (INPUT) TO (OUTPUT) EDGE RATE‡ tsk(LH)§ tsk(HL)§ A B Slow tsk(LH)§ tsk(HL)§ A tsk(LH)§ tsk(HL)§ B PARAMETER tsk(t) ( )§ MIN MAX 0.3 UNIT ns 0.4 B Fast 0.3 ns 0.3 0.4 Y ns 0.2 A B Slow 1.8 Fast 1.5 B Y tsk(prLH)¶ tsk(prHL)¶ A B Slow tsk(prLH)¶ tsk(prHL)¶ A B Fast tsk(prLH)¶ tsk(prHL)¶ B Y ns 1 0.7 2 0.5 1.7 1.2 ns ns ns 1.6 † Actual skew values between GTLP outputs could vary on the backplane due to the loading and impedance seen by the device. ‡ Slow (ERC = L) and Fast (ERC = H) § tsk(LH)/tsk(HL) and tsk(t) – Output-to-output skew is defined as the absolute value of the difference between the actual propagation delay for all outputs with the same packaged device. The specifications are given for specific worst-case VCC and temperature and apply to any outputs switching in the same direction either high to low [tsk(HL)] or low to high [tsk(LH)] or in opposite directions, both low to high and high to low [tsk(t)]. ¶ tsk(prLH)/tsk(prHL) – The magnitude of the difference in propagation delay times between corresponding terminals of two logic devices when both logic devices operate with the same supply voltages and at the same temperature, and have identical package types, identical specified loads, and identical logic functions. Furthermore, these values are provided by SPICE simulations. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 PARAMETER MEASUREMENT INFORMATION 1.5 V 6V 500 Ω From Output Under Test S1 Open 12.5 Ω From Output Under Test CL = 30 pF (see Note A) GND CL = 50 pF (see Note A) TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH 500 Ω S1 Open 6V GND LOAD CIRCUIT FOR Y OUTPUTS Test Point LOAD CIRCUIT FOR B OUTPUTS 3V 1.5 V Input 1.5 V 0V tPLH tPHL VOH 1V Output 1V VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (A input to B port) 1V 0V tPLH 1.5 V tPLZ 3V 1.5 V VOL Output Waveform 2 S1 at GND (see Note B) VOL + 0.3 V VOL tPHZ tPZH 1.5 V 1.5 V 0V Output Waveform 1 S1 at 6 V (see Note B) tPHL VOH Output 1.5 V tPZL 1.5 V 1V Input 3V Output Control 1.5 V VOH VOH – 0.3 V ≈0 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES (A input) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (B port to Y output) NOTES: A. CL includes probe and jig capacitance. B. 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. C. All input pulses are supplied by generators having the following characteristics: PRR ≈ 10 MHz, ZO = 50 Ω, tr ≈ 2 ns, tf ≈ 2 ns. D. The outputs are measured one at a time with one transition per measurement. Figure 1. Load Circuits and Voltage Waveforms 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 DISTRIBUTED-LOAD BACKPLANE SWITCHING CHARACTERISTICS The preceding switching characteristics table shows the switching characteristics of the device into a lumped load (Figure 1). However, the designer’s backplane application probably is a distributed load. The physical representation is shown in Figure 2. This backplane, or distributed load, can be approximated closely to a resistor inductance capacitance (RLC) circuit, as shown in Figure 3. This device has been designed for optimum performance in this RLC circuit. The following switching characteristics table shows the switching characteristics of the device into the RLC load, to help the designer better understand the performance of the GTLP device in the backplane. See www.ti.com/sc/gtlp for more information. 22 Ω .25” ZO = 50 Ω 1” 1” .25” 22 Ω 1.5 V 1.5 V 1.5 V 11 Ω Conn. 1” Conn. 1” Conn. Conn. 1” From Output Under Test LL = 14 nH Test Point 1” Rcvr Rcvr Rcvr Slot 2 Slot 19 Slot 20 CL = 18 pF Drvr Slot 1 Figure 3. High-Drive RLC Network Figure 2. High-Drive Test Backplane switching characteristics over recommended operating conditions for the bus transceiver function (unless otherwise noted) (see Figure 3) PARAMETER FROM (INPUT) TO (OUTPUT) EDGE RATE† tPLH tPHL A B Slow tPLH tPHL A B Fast tPLH tPHL A Y Slow tPLH tPHL A Y Fast tr Rise time, time B outputs (20% to 80%) tf Fall time, time B outputs (80% to 20%) TYP‡ 4.3 4.2 3.8 3.4 6.1 5.9 5.6 5.4 Slow 1.5 Fast 1 Slow 2.6 Fast 2 UNIT ns ns ns ns ns ns † Slow (ERC = H) and Fast (ERC = L) ‡ All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI SPICE models. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 11 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 APPLICATION INFORMATION operational description The GTLP1395 is designed specifically for use with the TI 1394 backplane layer controller family to transmit the 1394 backplane serial bus across parallel backplanes. But, it is a versatile two 1-bit device that also can provide multiple 1-bit clocks or an ATM read and write clock in multislot parallel backplane applications. The 1394–1995 is an IEEE designation for a high-performance serial bus. This serial bus defines both a backplane (e.g., GTLP, VME, FB+, CPCI, etc.) physical layer and a point-to-point cable-connected virtual bus. The backplane version operates at 25, 50, or 100 Mbps, whereas the cable version supports data rates of 100, 200, and 400 Mbps. Both versions are compatible at the link layer and above. The interface standard defines the transmission method, media in the cable version, and protocol. The primary application of the cable version is the interconnection of digital A/V equipment and integration of I/O connectivity at the back panel of personal computers using a low-cost, scalable, high-speed serial interface. The primary application of the backplane version is to provide a robust control interface to each daughter card. The 1394 standard also provides new services such as real-time I/O and live connect/disconnect capability for external devices. electrical The 1394 standard is a transaction-based packet technology for cable- or backplane-based environments. Both chassis and peripheral devices can use this technology. The 1394 serial bus is organized as if it were memory space interconnected between devices, or as if devices resided in slots on the main backplane. Device addressing is 64 bits wide, partitioned as 10 bits for bus ID, 6 bits for node ID, and 48 bits for memory addresses. The result is the capability to address up to 1023 buses, each having up to 63 nodes and each with 281 terabytes of memory. Memory-based addressing, rather than channel addressing, views resources as registers or memory that can be accessed with processor-to-memory transactions. Each bus entity is termed a unit, to be individually addressed, reset, and identified. Multiple nodes can reside physically in a single module, and multiple ports can reside in a single node. Some key features of the 1394 topology are multimaster capabilities, live connect/disconnect (hot plugging) capability, genderless cabling connectors on interconnect cabling, and dynamic node address allocation as nodes are added to the bus. A maximum of 63 nodes can be connected to one network. The cable-based physical interface uses dc-level line states for signaling during initialization and arbitration. Both environments use dominant mode addresses for arbitration. The backplane environment does not have the initialization requirements of the cable environment because it is a physical bus and does not contain repeaters. Due to the differences, a backplane-to-cable bridge is required to connect these two environments. The signals transmitted on both the cable and backplane environments are NRZ with data-strobe (DS) encoding. DS encoding allows only one of the two signal lines to change each data bit period, essentially doubling the jitter tolerance with very little additional circuitry overhead in the hardware. 12 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 APPLICATION INFORMATION protocol Both asynchronous and isochronous data transfers are supported. The asynchronous format transfers data and transaction layer information to an explicit address. The isochronous format broadcasts data based on channel numbers rather than specific addressing. Isochronous packets are issued on the average of each 125 µs in support of time-sensitive applications. Providing both asynchronous and isochronous formats on the same interface allows both non-real-time and real-time critical applications on the same bus. The cable environment’s tree topology is resolved during a sequence of events, triggered each time a new node is added or removed from the network. This sequence starts with a bus reset phase, where previous information about a topology is cleared. The tree ID sequence determines the actual tree structure, and a root node is dynamically assigned, or it is possible to force a particular node to become the root. After the tree is formed, a self-ID phase allows each node on the network to identify itself to all other nodes. During the self-ID process, each node is assigned an address. After all the information has been gathered on each node, the bus goes into an idle state, waiting for the beginning of the standard arbitration process. The backplane physical layer shares some commonality with the cable physical layer. Common functions include: bus-state determination, bus-access protocols, encoding and decoding functions, and synchronization of received data to a local clock. backplane features D D D D D 25-, 50-, and 100-Mbps data rates for backplane environments Live connection/disconnection possible without data loss or interruption Configuration ROM and status registers supporting plug and play Multidrop or point-to-point topologies supported. Specified bandwidth assignments for real-time applications applicability and typical application for IEEE 1394 backplane The 1394 backplane serial bus (BPSB) plays a supportive role in backplane systems, specifically GTLP, FutureBus+, VME64, and proprietary backplane bus systems. This supportive role can be grouped into three categories: D Diagnostics – – – D System enhancement – – – – D Alternate control path to the parallel backplane bus Test, maintenance, and troubleshooting Software debug and support interface Fault tolerance Live insertion CSR access Auxiliary 2-bit bus with a 64-bit address space to the parallel backplane bus Peripheral monitoring – Monitoring of peripherals (disk drives, fans, power supplies, etc.) in conjunction with another externally wired monitor bus, such as defined by the Intelligent Platform Management Interface (IPMI) The 1394 backplane physical layer (PHY) and the SN74GTLP1395 provide a cost-effective way to add high-speed 1394 connections to every daughter card in almost any backplane. More information on the backplane PHY devices and how to implement the 1394 standard in backplane and cable applications can be found at www.ti.com/sc/1394. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 13 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 APPLICATION INFORMATION SN74GTLP1395 interface with the TSB14AA1 1394 backplane PHY D D D D D D D D D 1A, 1B, and 1Y are used for the PHY data signals. 2A, 2B, and 2Y are used for the PHY strobe signals. PHY N_OEB_D or OCDOE connects to 1OEAB and 2OEAB, which control the PHY transmit signals. 1OEBY and 2OEBY are connected to GND because the transceiver must always be able to receive signals from the backplane and relay them to the PHY. 1T/C and 2T/C are connected to GND for inverted signals. VCC is nominal 3.3 V. BIAS VCC is connected to nominal 3.3 V to support live insertion. VREF is normally 2/3 of VTT. ERC is normally connected to VCC for slow edge-rate operation because frequencies of only 50 MHz (S100) and 25 MHz (S50) are required. logical representation VCC TSB14AA1 3.3-V VCC SN74GTLP1395 1 kΩ TDOE 1OEAB Tdata 1A 1B 2 D0–D1 BPdata Rdata 1Y Host Interface CTL0–CTL1 1394 LinkLayer LREQ Controller 2 1394 Backplane PhysicalLayer Controller OCDOE 2OEAB Tstrb 2A 2B SCLK BPstrb Rstrb 2Y 14 POST OFFICE BOX 655303 GND 1OEBY 1T/C GND GND 2OEBY 2T/C GND • DALLAS, TEXAS 75265 SN74GTLP1395 TWO 1-BIT LVTTL-TO-GTLP ADJUSTABLE-EDGE-RATE BUS TRANSCEIVERS WITH SPLIT LVTTL PORT, FEEDBACK PATH, AND SELECTABLE POLARITY SCES349C – JUNE 2001 – REVISED NOVEMBER 2001 APPLICATION INFORMATION physical representation 64-Bit Data Bus 32- to 64-Bit Address Bus GTLP1395 Transceiver 1394 Backplane PHY 1394 Link-Layer Controller Host Microprocessor Terminators Backplane Trace Connectors VME/FB+/CPCI or GTLP Transceivers STRB 2A Module Module Module Node Node Node PHY PHY PHY 2Y 1A 1Y VTT RTT DATA VTT 2B STRB RTT DATA 1B POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 15 PACKAGE OPTION ADDENDUM www.ti.com 5-Sep-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty 74GTLP1395DGVRE4 ACTIVE TVSOP DGV 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395DGVR ACTIVE TVSOP DGV 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395DW ACTIVE SOIC DW 20 25 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395DWE4 ACTIVE SOIC DW 20 25 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395DWR ACTIVE SOIC DW 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395DWRE4 ACTIVE SOIC DW 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395GQNR ACTIVE VFBGA GQN 20 1000 TBD SNPB Level-1-240C-UNLIM SN74GTLP1395PW ACTIVE TSSOP PW 20 70 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395PWE4 ACTIVE TSSOP PW 20 70 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395PWR ACTIVE TSSOP PW 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74GTLP1395PWRE4 ACTIVE TSSOP PW 20 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 1 MECHANICAL DATA MPDS006C – FEBRUARY 1996 – REVISED AUGUST 2000 DGV (R-PDSO-G**) PLASTIC SMALL-OUTLINE 24 PINS SHOWN 0,40 0,23 0,13 24 13 0,07 M 0,16 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 0°–8° 1 0,75 0,50 12 A Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,08 14 16 20 24 38 48 56 A MAX 3,70 3,70 5,10 5,10 7,90 9,80 11,40 A MIN 3,50 3,50 4,90 4,90 7,70 9,60 11,20 DIM 4073251/E 08/00 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion, not to exceed 0,15 per side. Falls within JEDEC: 24/48 Pins – MO-153 14/16/20/56 Pins – MO-194 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. 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