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GTLP6C817 Low Drive GTLP/LVTTL 1:6 Clock Driver
June 1999 Revised December 2000
GTLP6C817 Low Drive GTLP/LVTTL 1:6 Clock Driver
General Description
The GTLP6C817 is a low drive clock driver that provides TTL to GTLP signal level translation (and vice versa). The device provides a high speed interface between cards operating at TTL 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. Fairchild's GTLP has internal 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 threshold. GTLP output LOW level is typically less than 0.5V, the output level HIGH is 1.5V and the receiver threshold is 1.0V.
Features
s Interface between LVTTL and GTLP logic levels s Designed with edge rate control circuitry to reduce output noise on the GTLP port s VREF pin provides external supply reference voltage for receiver threshold adjustibility s Special PVT compensation circuitry to provide consistent performance over variations of process, supply voltage and temperature s TTL compatible driver and control inputs s Designed using Fairchild advanced CMOS technology s Bushold data inputs on A port to eliminate the need for external pull-up resistors for unused inputs s Power up/down and power off high impedance for live insertion s 5V over voltage tolerance on LVTTL ports s Open drain on GTLP to support wired-or connection s A Port source/sink -12mA/+12mA s B Port sink +40mA s 1:6 fanout clock driver for TTL port s 1:2 fanout clock driver for GTLP port
Ordering Code:
Order Number GTLP6C817MTC Package Number MTC24 Package Description 24-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
Device is also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Pin Descriptions
Pin Names Description TTLIN, GTLPIN Clock Inputs (TTL and GTLP respectively) OEB OEA VCCT.GNDT VCC GNDG VREF OA0-OA5 OB0-OB1 Output Enable (Active LOW) GTLP Port (TTL Levels) Output Enable (Active LOW) TTL Port (TTL Levels) LVTTL Output Supplies (3V) Internal Circuitry VCC (5V) OBn GTLP Output Grounds Voltage Reference Input TTL Buffered Clock Outputs GTLP Buffered Clock Outputs
Connection Diagram
(c) 2000 Fairchild Semiconductor Corporation
DS500246
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GTLP6C817
Functional Description
The GTLP6C817 is a low drive clock driver providing LVTTL-to-GTLP clock translation, and GTLP-to-LVTTL clock translation in the same package. The LVTTL-to-GTLP direction is a 1:2 clock driver path with a single Enable pin (OEB). For the GTLP-to-LVTTL direction the clock receiver path is a 1:6 buffer with a single Enable control (OEA). Data polarity is inverting for both directions.
Truth Tables
Inputs TTLIN H L X Inputs GTLPIN H L X OEA L L H OEB L L H Outputs OBn L H High Z Outputs OAn L H High Z
Logic Diagram
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GTLP6C817
Absolute Maximum Ratings(Note 1)
Supply Voltage (VCC) DC Input Voltage (VI) DC Output Voltage (VO) Outputs 3-STATE Outputs Active (Note 2) DC Output Sink Current into OA Port IOL DC Output Source Current from OA Port IOH DC Output Sink Current into OB Port in the LOW State IOL DC Input Diode Current (IIK) VI < 0V DC Output Diode Current (IOK) VO < 0V VO > VCC ESD Rating Storage Temperature (TSTG) 80 mA 24 mA
-0.5V to +7.0V -0.5V to +7.0V -0.5V to +7.0V -0.5V to +7.0V
Recommended Operating Conditions (Note 3)
Supply Voltage VCC VCCT Bus Termination Voltage (VTT) GTLP VREF Input Voltage (VI) on INA Port and Control Pins HIGH Level Output Current (IOH) OA Port LOW Level Output Current (IOL) OA Port OB Port Operating Temperature (TA) 1.47V to 1.53V 0.98V to 1.02V 0.0V to 5.5V 4.75V to 5.25V 3.15V to 3.45V
-24 mA
-12 mA +12 mA +40 mA -40C to +85C
-50 mA -50 mA +50 mA > 2000V -65C to +150C
Note 1: Absolute Maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum rated conditions is not implied. Note 2: Io Absolute Maximum Rating must be observed. Note 3: Unused input must be held HIGH or LOW.
DC Electrical Characteristics
Over Recommended Operating Free-Air Temperature Range, VREF = 1.0V (unless otherwise noted). Symbol VIH VIL VREF (Note 5) VTT (Note 5) VIK VOH OAn Port GTLPIN Others GTLPIN Others GTLP GTL GTLP GTL VCC = 4.75V VCCT = 3.15V VCC = 4.75V VCCT = 3.15V VOL OAn Port VCC = 4.75V VCCT = 3.15V VOL II OBn Port TTLIN/ Control Pins GTLPIN IOFF IOZH IOZL VCC = 4.75V VCCT = 3.15V VCC = 5.25V VCCT = 3.45V VCC = 5.25V VCCT = 3.45V TTLIN, OAn Port, Control Pins VCC = 0 GTLPIN, OBn Port OAn Port OBn Port OAn Port OBn Port VCCT = 0 VCC = 5.25V VCCT = 3.45V VCC = 5.25V VCCT = 3.45V II = -18 mA IOH = -100 A IOH = -6 mA IOH = -12 mA IOL = 100 A IOL = 6 mA IOL = 12 mA IOL = 100 A IOL = 40 mA VI = 5.25V VI = 0V VI = VTT VI = 0 VI or VO = 0V to 5.25V VI or VO = 0 to VTT VO = 5.25V VO = 1.5V VO = 0 VO = 0 VCC- 0.2 2.4 2.2 0.2 0.4 0.5 0.2 0.5 5 -5 5 -5 30 30 5 5 -5 V A A A A A V V 1.0 0.8 1.5 1.2 -1.2 Test Conditions Min VREF + 0.05 2.0 0.0 VREF - 0.05 0.8 Typ (Note 4) VTT Max Units V V V V V
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GTLP6C817
DC Electrical Characteristics
Symbol IPU/PD ICC (5V) All Ports OAn or OBn Ports
(Continued)
Min Typ (Note 4) 30 10 10 10 45 45 A mA Max
Test Conditions VCC = VCCT = 0 to 1.5V OE = Don't Care VCC = 5.25V VCCT = 3.45V Outputs HIGH Outputs LOW Outputs Disabled VI = VCC or GND
Units A
ICC (3V)
OAn or OBn Ports
VCC = 5.25V VCCT = 3.45V VCC = 5.25V VCCT = 3.45V
Outputs HIGH, LOW Outputs Disabled VI = VCC or GND
ICC CIN COUT
TTLIN Control Pins/GTLPIN/TTLIN OAn Port OBn Port
VI = VCC-2.1 VI = VCC or 0 VI = VCC or 0 VI = VCC or 0 3 3 4
1 3.5 4.5 5
mA pF pF
Note 4: All typical values are at VCC = 5.0V VCCT = 3.3V and TA = 25C. Note 5: GTLP VREF and VTT are specified to 2% tolerance since signal integrity and noise margin can be significantly degraded if these supplies are noisy. In addition, VTT and RTERM can be adjusted to accommodate backplane impedances other than 50, within the boundaries of not exceeding the DC Absolute IOL ratings. Similarly VREF can be adjusted to compensate for changes in V TT.
AC Electrical Characteristics
Over recommended range of supply voltage and operating free air temperature. VREF = 1.0V (unless otherwise noted).
CL = 30 pF for OBn Port and CL = 50 pF for OAn Port.
From Symbol (Input) tPLH tPHL tPLH tPHL tRISE tFALL tRISE tFALL tPZH, tPZL tPLZ, tPHZ tPLH tPHL
Note 6: All typical values are at VCC = 5.0V and TA = 25C.
To (Output) OBn
Min
Typ (Note 6)
Max Units
TTLIN
2.3 1.5
4.7 ns 4.6 4.8 ns 4.7 1.7 2.1 2.7 2.2 ns ns ns ns 6.5 ns 6.5 6.6 ns 6.0
OEB
OBn
2.4 1.6
Transition Time, OB Outputs (20% to 80%) Transition Time, OB outputs (20% to 80%) Transition Time, OA outputs (10% to 90%) Transition Time, OA outputs (10% to 90%) OEA OAn 2.4 2.0 GTLPIN OAn 3.1 2.8
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GTLP6C817
Extended Electrical Characteristics
Over recommended ranges 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 tOSLH tOSHL tPS tPV(HL) tOSLH tOSHL tOST tPS tPV (Note 8) (Note 8) (Note 9) (Note 10) (Note 11) (Note 8) (Note 8) (Note 8) (Note 9) (Note 10) From (Input) A A A A B B B B B To (Output) B B B B A A A A A .12 .12 .6 0.5 Min Typ (Note 7) .05 .05 0.5 Max .4 .4 1.0 .7 .5 .5 1.0 1.0 1.2 Unit ns ns ns ns ns ns ns
Note 7: All typical values are at VCC = 5.0V and TA = 25C. Note 8: tOSHL/tOSLH and tOST - Output-to-Output skew is defined as the absolute value of the difference between the actual propagation delay for all outputs within 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 (tOSHL) or LOW-to-HIGH (tOSLH) or in opposite directions both HL and LH (tOST). This parameter is guaranteed by design and statistical process distribution. Actual skew values between the GTLP outputs could vary on the backplane due to the loading and impedance seen by the device. Note 9: tPS - Pin or Transition skew is defined as the difference between the LOW-to-HIGH transition and the HIGH-to-LOW transition on the same pin. The parameter is measured across all the outputs of the same chip is specified for a specific worst case VCC and temperature. This parameter is guaranteed by design and statistical process distribution. Actual skew values between the GTLP outputs could vary on the backplane due to the loading and impedance seen by the device. Note 10: tPV - Part-to-Part skew is defined as the absolute value of the difference between the actual propagation design for all outputs from device-todevice. The parameter is specified for a specific worst case VCC and temperature. This parameter is guaranteed by design and statistical process distribution. Actual skew values between the GTLP output could vary on the backplane due to the loading and impedance seen by the device. Note 11: Due to the open drain structure on GTLP outputs, tOST and tPV(LH) in the A-to-B direction are not specified. Skew on these paths is dependent on the VTT and RT values in the actual application.
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GTLP6C817
Test Circuit and Timing Waveforms
Test Circuit for A Outputs Test Circuit for B Outputs
Note A: CL includes probes and jig capacitance.
Note A: CL includes probes and jig capacitance. Note B: For B Port CL = 30 pF is used for worst case.
Voltage Waveform - Propagation Delay Times
Voltage Waveform - Enable and Disable Times
Output Waveform 1 is for an output with internal conditions such that the output is LOW except when disabled by the control output Output Waveforms 2 is for an output with internal conditions such that the output is HIGH except when disabled by the control output
Input and Measure Conditions A or LVTTL Pins VinHIGH VinLOW VM VX VY VCC 0.0 VCC/2 VOL + 0.3V VOH + 0.3V B or GTLP Pins 1.5 0.0 1.0 N/A N/A
All input pulses have the following characteristics: Frequency = 10MHz, tRISE = tFALL = 2 ns, ZO = 50. The outputs are measured one at a time with one transition per measurement.
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GTLP6C817 Low Drive GTLP/LVTTL 1:6 Clock Driver
Physical Dimensions inches (millimeters) unless otherwise noted
24-Lead Thin Shrink Small Outline Package (TSSOP), 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: 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. 7 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. www.fairchildsemi.com
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