SN74GTLPH32945KR

SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001 D D D D D D Member of the Texas Instruments Widebus+ Family 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 LVTTL Interfaces Are 5-V Tolerant Medium-Drive GTLP Outputs (50 mA) D D D D D D LVTTL Outputs (–24 mA/24 mA) GTLP Rise and Fall Times Designed for Optimal Data-Transfer Rate and Signal Integrity in Distributed Loads Ioff, Power-Up 3-State, and BIAS VCC Support Live Insertion Bus Hold on A-Port Data Inputs Distributed VCC and GND Pins Minimize High-Speed Switching Noise Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II description The SN74GTLPH32945 is a medium-drive, 32-bit bus transceiver that provides LVTTL-to-GTLP and GTLP-to-LVTTL signal-level translation. It is partitioned as four 8-bit transceivers. The device provides a high-speed interface between cards operating at LVTTL logic levels and a backplane operating at GTLP signal levels. High-speed (about three times faster than standard TTL or LVTTL) backplane operation is a direct result of GTLP’s reduced output swing ( VCC. 3. The package thermal impedance is calculated in accordance with JESD 51-7. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – 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 VREF–0.05 0.8 V –18 mA A port –24 mA A port 24 B port 50 Except B port High-level output current IOL MIN 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 is two-thirds VTT. TI-OPC circuitry 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 SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001 electrical characteristics over recommended operating free-air temperature range for GTLP (unless otherwise noted) PARAMETER VIK VOH A port TEST CONDITIONS VCC = 3.15 V, VCC = 3.15 V to 3.45 V, II = –18 mA IOH = –100 µA VCC = 3 3.15 15 V IOH = –12 mA IOH = –24 mA VOL B port II Control inputs A port IOZH‡ B port TYP† MAX UNIT –1.2 V VCC–0.2 2.4 V 2 IOL = 100 µA IOL = 12 mA 0.2 0.5 VCC = 3.15 V to 3.45 V, IOL = 24 mA IOL = 100 µA 0.2 VCC = 3.15 V IOL = 10 mA IOL = 40 mA IOL = 50 mA 0.55 VI = 0 or 5.5 V ±10 VCC = 3.15 V to 3.45 V, A port MIN VCC = 3 3.15 15 V VCC = 3.45 V, VCC = 3 3.45 45 V 0.4 0.2 0.4 VO = VCC 10 VO = 1.5 V 10 –10 IOZL‡ IBHL§ A and B ports VCC = 3.45 V, VO = GND A port IBHH¶ IBHLO# IBHHO|| A port VCC = 3.15 V, VCC = 3.15 V, VI = 0.8 V VI = 2 V VCC = 3.45 V, VCC = 3.45 V, VI = 0 to VCC VI = 0 to VCC VCC = 3.45 V, IO = 0, VI (A-port or control input) = VCC or GND, VI (B port) = VTT or GND Outputs high 100 Outputs low 100 Outputs disabled 100 ICC A port A port A or B port Ci Ciio Control inputs µA µA µA 75 µA –75 µA 500 µA µA –500 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 ∆ICCk V mA 1 mA pF 4.5 5 A port VI = 3.15 V or 0 VO = 3.15 V or 0 7.5 9 B port VO = 1.5 V or 0 7.5 9 pF † All typical values are at VCC = 3.3 V, TA = 25°C. ‡ For I/O ports, the parameters IOZH and IOZL include the input leakage current. § The bus-hold circuit can sink at least the minimum low sustaining current at VILmax. IBHL should be measured after lowering VIN to GND and then raising it to VILmax. ¶ The bus-hold circuit can source at least the minimum high sustaining current at VIHmin. IBHH should be measured after raising VIN to VCC and then lowering it to VIHmin. # An external driver must source at least IBHLO to switch this node from low to high. || An external driver must sink at least IBHHO to switch this node from high to low. k This is the increase in supply current for each input that is at the specified TTL voltage level rather than VCC or GND. hot-insertion specifications for A port over recommended operating free-air temperature range PARAMETER TEST CONDITIONS MIN MAX UNIT 10 µA VO = 0.5 V to 3 V, VI or VO = 0 to 5.5 V OE = 0 ±30 µA VO = 0.5 V to 3 V, OE = 0 ±30 µA Ioff IOZPU VCC = 0, VCC = 0 to 1.5 V, BIAS VCC = 0, IOZPD VCC = 1.5 V to 0, POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001 live-insertion specifications for B port over recommended operating free-air temperature range PARAMETER TEST CONDITIONS BIAS VCC = 0, ±30 µA BIAS VCC = 0, VO = 0.5 V to 1.5 V, OE = 0 ±30 µA 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 IOZPD VCC = 1.5 V to 0, VCC = 0 to 3.15 V VO IO VCC = 0, UNIT µA BIAS VCC = 0, VCC = 3.15 V to 3.45 V VCC = 0, MAX 10 VCC = 0, VCC = 0 to 1.5 V, ICC (BIAS VCC) MIN VI or VO = 0 to 1.5 V VO = 0.5 V to 1.5 V, OE = 0 Ioff IOZPU BIAS VCC = 3.15 V to 3.45 V, 0.95 5 mA 10 µA 1.05 V µA –1 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) tPLH tPHL A B OE B ten tdis tr tf tPLH tPHL ten tdis TYP† MAX 2.1 6.3 2.1 6.3 2 6.9 2 6.9 UNIT ns ns Rise time, B outputs (20% to 80%) 2.5 ns Fall time, B outputs (80% to 20%) 2.1 ns B A OE A † All typical values are at VCC = 3.3 V, TA = 25°C. 8 MIN POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2.1 5.3 2.1 5.3 0.3 5.7 0.3 5.7 ns ns SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – REVISED NOVEMBER 2001 PARAMETER MEASUREMENT INFORMATION 1.5 V 6V 500 Ω From Output Under Test S1 Open GND CL = 50 pF (see Note A) TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH 500 Ω 25 Ω From Output Under Test CL = 30 pF (see Note A) S1 Open 6V GND LOAD CIRCUIT FOR A 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 port to B port) 1V 0V tPLH 1.5 V 1.5 V 0V Output Waveform 1 S1 at 6 V (see Note B) tPHL tPLZ 3V 1.5 V VOL + 0.3 V VOL tPHZ tPZH VOH Output 1.5 V tPZL 1.5 V 1V Input 3V Output Control 1.5 V VOL Output Waveform 2 S1 at GND (see Note B) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES (B port to A port) 1.5 V VOH VOH – 0.3 V ≈0 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES (A port) 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 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 SN74GTLPH32945 32-BIT LVTTL-TO-GTLP BUS TRANSCEIVER SCES293C – OCTOBER 1999 – 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 this typical backplane. See www.ti.com/sc/gtlp for more information. 38 Ω .25” ZO = 70 Ω 2” 2” .25” 38 Ω 1.5 V 1.5 V 1.5 V Conn. Conn. 1” Conn. 1” 1” Conn. 19 Ω From Output Under Test 1” Rcvr Rcvr Rcvr Slot 2 Slot 9 Slot 10 LL = 19 nH CL = 9 pF Drvr Slot 1 Test Point Figure 2. Medium-Drive Test Backplane Figure 3. Medium-Drive RLC Network 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 3) PARAMETER tPLH tPHL ten tdis tr tf FROM (INPUT) TO (OUTPUT) A B OE B 4.3 4.3 5 4.4 UNIT ns ns Rise time, B outputs (20% to 80%) 1 ns Fall time, B outputs (80% to 20%) 2 ns † All typical values are at VCC = 3.3 V, TA = 25°C. All values are derived from TI-SPICE models. 10 TYP† POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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