SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 D D D D D D D Member of the Texas Instruments Widebus Family EPIC (Enhanced-Performance Implanted CMOS) Submicron Process Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C Typical VOHV (Output VOH Undershoot) > 2 V at VCC = 3.3 V, TA = 25°C Latch-Up Performance Exceeds 250 mA Per JEDEC Standard JESD-17 Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors Package Options Include Plastic 300-mil Shrink Small-Outline (DL) and Thin Shrink Small-Outline (DGG) Packages description This 16-bit bus transceiver and register is designed for low-voltage (3.3-V) VCC operation. The SN74LVC16646 can be used as two 8-bit transceivers or one 16-bit transceiver. The device consists of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal registers. Data on the A or B bus is clocked into the registers on the low-to-high transition of the appropriate clock (CLKAB or CLKBA) input. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the SN74LVC16646. DGG OR DL PACKAGE (TOP VIEW) 1DIR 1CLKAB 1SAB GND 1A1 1A2 VCC 1A3 1A4 1A5 GND 1A6 1A7 1A8 2A1 2A2 2A3 GND 2A4 2A5 2A6 VCC 2A7 2A8 GND 2SAB 2CLKAB 2DIR 1 56 2 55 3 54 4 53 5 52 6 51 7 50 8 49 9 48 10 47 11 46 12 45 13 44 14 43 15 42 16 41 17 40 18 39 19 38 20 37 21 36 22 35 23 34 24 33 25 32 26 31 27 30 28 29 1OE 1CLKBA 1SBA GND 1B1 1B2 VCC 1B3 1B4 1B5 GND 1B6 1B7 1B8 2B1 2B2 2B3 GND 2B4 2B5 2B6 VCC 2B7 2B8 GND 2SBA 2CLKBA 2OE Output-enable (OE) and direction-control (DIR) inputs control the transceiver functions. In the transceiver mode, data present at the high-impedance port may be stored in either register or in both. The select-control (SAB and SBA) inputs can multiplex stored and real-time (transparent mode) data. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. DIR determines which bus receives data when OE is low. In the isolation mode (OE high), A data may be stored in one register and/or B data may be stored in the other register. When an output function is disabled, the input function is still enabled and can be used to store and transmit data. Only one of the two buses, A or B, may be driven at a time. To ensure the high-impedance state during power up or power down, 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. Active bus-hold circuitry holds unused or floating data inputs at a valid logic level. The SN74LVC16646 is characterized for operation from – 40°C to 85°C. 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. EPIC and Widebus are trademarks of Texas Instruments Incorporated. Copyright 1995, 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 SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS OE L DIR L CLKAB CLKBA X X SAB X BUS B BUS A BUS A BUS B SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 SBA L OE L DIR H DIR X X X CLKAB CLKBA X ↑ X ↑ ↑ ↑ SAB X X X SBA X X X OE L L SBA X BUS B DIR L H STORAGE FROM A, B, OR A AND B CLKAB X H or L CLKBA H or L X SAB X H TRANSFER STORED DATA TO A AND/OR B Figure 1. Bus-Management Functions 2 SAB L BUS A BUS A OE X X H CLKBA X REAL-TIME TRANSFER BUS A TO BUS B BUS B REAL-TIME TRANSFER BUS B TO BUS A CLKAB X POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SBA H X SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 logic symbol† 1OE 1DIR 1CLKBA 1SBA 1CLKAB 1SAB 2OE 2DIR 2CLKBA 2SBA 2CLKAB 2SAB 1A1 56 1 55 54 2 3 29 28 30 31 27 26 G3 3 EN1 [BA] 3 EN2 [AB] C4 G5 C6 G7 G10 10 EN8 [BA] 10 EN9 [AB] C11 G12 C13 G14 ≥1 5 1 1A2 1A3 1A4 1A5 1A6 1A7 1A8 2A1 ≥1 7 1 7 8 49 9 48 10 47 12 45 13 44 14 43 15 2A3 2A4 2A5 2A6 2A7 2A8 16 1B1 2 51 ≥1 8 12 11D 42 1B2 1B3 1B4 1B5 1B6 1B7 1B8 2B1 12 1 13D 14 2A2 52 5 1 6D 6 4D 5 1 14 ≥1 9 41 17 40 19 38 20 37 21 36 23 34 24 33 2B2 2B3 2B4 2B5 2B6 2B7 2B8 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 logic diagram (positive logic) 1OE 1DIR 1CLKBA 1SBA 1CLKAB 1SAB 56 1 55 54 2 3 One of Eight Channels 1D C1 1A1 5 52 1B1 1D C1 2OE 2DIR 2CLKBA 2SBA 2CLKAB 2SAB To Seven Other Channels 29 28 30 31 27 26 One of Eight Channels 1D C1 2A1 15 42 1D C1 To Seven Other Channels 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2B1 SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 FUNCTION TABLE INPUTS DATA I/Os OE DIR CLKAB CLKBA SAB SBA A1 THRU A8 X X ↑ X X X Input B1 THRU B8 Unspecified† Input OPERATION OR FUNCTION Store A, B unspecified† Store B, A unspecified† X X X ↑ X X Unspecified† H X ↑ ↑ X X Input Input Store A and B data H X H or L H or L X X Input disabled Input disabled Isolation, hold storage L L X X X L Output Input Real-time B data to A bus L L X H or L X H Output Input Stored B data to A bus L H X X L X Input Output Real-time A data to B bus L H H or L X H X Input Output Stored A data to B bus † The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled; i.e., data at the bus terminals is stored on every low-to-high transition of the clock inputs. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 4.6 V Input voltage range, VI: Except I/O ports (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 4.6 V I/O ports (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Output voltage range, VO (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 50 mA Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 100 mA Maximum power dissipation at TA = 55°C (in still air) (see Note 3): DGG package . . . . . . . . . . . . . . . . . . 1 W DL package . . . . . . . . . . . . . . . . . . 1.4 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 value is limited to 4.6 V maximum. 3. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils. For more information, refer to the Package Thermal Considerations application note in the 1994 ABT Advanced BiCMOS Technology Data Book, literature number SCBD002B. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 recommended operating conditions (see Note 4) MIN MAX 2.7 3.6 VCC VIH Supply voltage VIL VI Low-level input voltage Input voltage 0 VO Output voltage 0 High-level input voltage VCC = 2.7 V to 3.6 V VCC = 2.7 V to 3.6 V IOH High level output current High-level VCC = 2.7 V VCC = 3 V IOL Low level output current Low-level VCC = 2.7 V VCC = 3 V ∆t /∆V Input transition rise or fall rate 2 V V 0.8 V VCC VCC V – 12 12 – 24 24 TA Operating free-air temperature NOTE 4: Unused control inputs must be held high or low to prevent them from floating. UNIT V mA mA 0 10 ns / V – 40 85 °C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VCC† MIN to MAX TEST CONDITIONS IOH = – 100 µA VOH 2.7 IOH = – 12 mA IOH = – 24 mA IOL = 100 µA VOL II II(hold) ( ) Control inputs A or B ports IOZ§ ICC Ci 3 2.4 3 2 0.2 0.4 3 0.55 VI = VCC or GND VI = 0.8 V 3.6 3 VI = 2 V VI = 0 to 3.6 V IO = 0 Other inputs at VCC or GND VI = VCC or GND VO = VCC or GND • DALLAS, TEXAS 75265 ±5 V µA 75 µA –75 3.6 ± 500 3.6 ± 10 µA 3.6 40 µA 500 µA 3 V to 3.6 V 3.3 POST OFFICE BOX 655303 UNIT V 2.7 Cio A or B ports 3.3 † For conditions shown as MIN or MAX, use the appropriate values under recommended operating conditions. ‡ All typical values are at VCC = 3.3 V, TA = 25°C. § For I/O ports, the parameter IOZ includes the input leakage current. 6 MAX VCC – 0.2 2.2 IOL = 12 mA IOL = 24 mA One input at VCC – 0.6 V, Control inputs TYP‡ MIN to MAX VO = VCC or GND VI = VCC or GND, nICC MIN 3 pF 7 pF SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 3.3 V ± 0.3 V VCC = 2.7 V MIN MAX MIN MAX 0 100 0 80 UNIT fclock tw Clock frequency 4.5 4.5 ns tsu th Setup time, A or B before CLKAB↑ or CLKBA↑ Data high or low 5 5 ns Hold time, A or B after CLKAB↑ or CLKBA↑ Data high or low 0 0 ns Pulse duration, CLK high or low MHz switching characteristics over recommended operating free-air temperature range, CL = 50 pF (unless otherwise noted) (see Figure 2) PARAMETER FROM (INPUT) TO (OUTPUT) A or B B or A fmax tpd CLKAB or CLKBA A or B OE tdis di MIN MAX VCC = 2.7 V MIN 100 SAB or SBA ten VCC = 3.3 V ± 0.3 V A or B DIR OE A or B DIR UNIT MAX 80 MHz 1.5 7 8 1.5 8.5 9.5 1.5 8.5 9.5 1.5 8 9 1.5 8 9 1.5 8.5 9.5 1.5 8.5 9.5 ns ns ns operating characteristics, VCC = 3.3 V, TA = 25°C PARAMETER Cpd d Power dissipation capacitance per transceiver TEST CONDITIONS Outputs enabled Outputs disabled POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 CL = 50 pF, pF f = 10 MHz TYP 17 4 UNIT pF 7 SN74LVC16646 16-BIT BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS SCAS318B – NOVEMBER 1993 – REVISED JULY 1995 PARAMETER MEASUREMENT INFORMATION 6V 500 Ω From Output Under Test S1 Open GND CL = 50 pF (see Note A) 500 Ω TEST S1 tpd tPLZ/tPZL tPHZ/tPZH Open 6V GND 2.7 V LOAD CIRCUIT FOR OUTPUTS 1.5 V Timing Input 0V tw tsu 2.7 V 1.5 V Input 1.5 V th 2.7 V 1.5 V Data Input 1.5 V 0V 0V VOLTAGE WAVEFORMS PULSE DURATION VOLTAGE WAVEFORMS SETUP AND HOLD TIMES 2.7 V 1.5 V Input 1.5 V 0V VOH 1.5 V Output 1.5 V VOL VOH Output 1.5 V 1.5 V 0V 1.5 V VOL tPLZ Output Waveform 1 S1 at 6 V (see Note B) tPLH tPHL 1.5 V tPZL tPHL tPLH 2.7 V Output Control Output Waveform 2 S1 at GND (see Note B) 1.5 V tPZH VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS 3V VOL + 0.3 V VOL tPHZ 1.5 V VOH – 0.3 V VOH [0V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING 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 ≤ 2.5 ns, tf ≤ 2.5 ns. D. The outputs are measured one at a time with one transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPLH and tPHL are the same as tpd. Figure 2. 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