SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996 D EPICt (Enhanced-Performance Implanted CMOS) 1-mm Process Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages, Ceramic Chip Carriers (FK), and Flatpacks (W), and Standard Plastic (N) and Ceramic (J) DIPs SN54AC245 . . . J OR W PACKAGE SN74AC245 . . . DB, DW, N, OR PW PACKAGE (TOP VIEW) DIR A1 A2 A3 A4 A5 A6 A7 A8 GND description The ’AC245 octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation minimizes external timing requirements. 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 VCC OE B1 B2 B3 B4 B5 B6 B7 B8 SN54AC245 . . . FK PACKAGE (TOP VIEW) A2 A1 DIR VCC When the output-enable (OE) is low, the device passes noninverted data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction control (DIR) input. A high on OE disables the device so that the buses are effectively isolated. A3 A4 A5 A6 A7 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 B1 B2 B3 B4 B5 A8 GND B8 B7 B6 The SN54AC245 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74AC245 is characterized for operation from – 40°C to 85°C. OE D FUNCTION TABLE INPUTS OE DIR L L H L H X OPERATION B data to A bus A data to B bus Isolation 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 is a trademark of Texas Instruments Incorporated. Copyright 1996, 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 SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996 logic symbol† OE DIR A1 19 1 2 logic diagram (positive logic) G3 DIR 3EN1[BA] 3EN2[AB] 19 18 1 B1 2 A2 A3 A4 A5 A6 A7 A8 1 3 17 4 16 5 15 6 14 7 13 8 12 9 11 A1 OE 2 B2 18 B3 B1 B4 B5 B6 B7 To Seven Other Channels B8 † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Output voltage range, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0 or VI > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 50 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 200 mA Maximum power dissipation at TA = 55°C (in still air)(see Note 2): DB package . . . . . . . . . . . . . . . . . . . 0.6 W DW package . . . . . . . . . . . . . . . . . . 1.6 W N package . . . . . . . . . . . . . . . . . . . . 1.3 W PW package . . . . . . . . . . . . . . . . . . . 0.7 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 voltage ratings may be exceeded if the input and output current ratings are observed. 2. The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996 recommended operating conditions (see Note 3) SN54AC245 VCC VIH Supply voltage VCC = 3 V VCC = 4.5 V High-level input voltage VCC = 5.5 V VCC = 3 V VIL VI VO IOH IOL Dt /Dv Low-level input voltage MAX 2 6 Low-level output current 6 3.15 3.85 0.9 1.35 1.35 1.65 1.65 VCC VCC 0 0 VCC VCC –12 –24 –24 VCC = 5.5 V VCC = 3 V –24 –24 12 12 VCC = 4.5 V VCC = 5.5 V 24 24 24 24 • DALLAS, TEXAS 75265 V 3.85 0.9 –12 TA Operating free-air temperature NOTE 3: Unused inputs must be held high or low to prevent them from floating. UNIT V VCC = 3 V VCC = 4.5 V Input transition rise or fall rate POST OFFICE BOX 655303 2 3.15 0 High-level output current MAX 2.1 0 Output voltage MIN 2.1 VCC = 4.5 V VCC = 5.5 V Input voltage SN74AC245 MIN V V V mA mA 0 8 0 8 ns / V –55 125 –40 85 °C 3 SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC IOH = –50 mA IOH = –12 mA VOH IOH = –24 24 mA IOH = – 50 mA† IOH = – 75 mA† IOL = 24 mA IOL = 50 mA† IOL = 75 mA† II MIN MAX SN74AC245 MIN 3V 2.9 2.9 2.9 4.5 V 4.4 4.4 4.4 5.5 V 5.4 5.4 5.4 3V 2.56 2.4 2.46 4.5 V 3.86 3.7 3.76 5.5 V 4.86 4.7 4.76 V 3.85 0.002 0.1 0.1 0.1 4.5 V 0.001 0.1 0.1 0.1 5.5 V 0.001 0.1 0.1 0.1 3V 0.36 0.5 0.44 4.5 V 0.36 0.5 0.44 5.5 V 0.36 0.5 0.44 IOZ VO = VCC or GND, VI(OE) = VIL or VIH 5.5 V ICC Ci VI = VCC or GND, VI = VCC or GND V 1.65 5.5 V 55V 5.5 UNIT 3.85 5.5 V IO = 0 MAX 3V VI = VCC or GND OE or DIR SN54AC245 5.5 V IOL = 12 mA A or B ports‡ TA = 25°C TYP MAX 5.5 V IOL = 50 mA VOL MIN 1.65 5.5 V 5V ± 0.1 ±1 ±1 ± 0.1 ±1 ±1 ± 0.5 ± 10 ±5 mA 4 80 40 mA 4.5 mA pF Cio VO = VCC or GND 5V 15 † Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms. ‡ For I/O ports, the parameter IOZ includes the input leakage current. pF " switching characteristics over recommended operating free-air temperature range, VCC = 3.3 V 0.3 V (unless otherwise noted) (see Figure 1) 4 PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B POST OFFICE BOX 655303 MIN TA = 25°C TYP MAX 1.5 5 1.5 SN54AC245 SN74AC245 MIN MAX MIN MAX 8.5 1 11.5 1 9 5 8.5 1 10 1 9 2.5 7 11.5 1 13.5 2 12.5 2.5 7.5 12 1 14.5 2 13.5 2 6.5 12 1 13.5 1 12.5 2 7 11.5 1 14 1.5 13 • DALLAS, TEXAS 75265 UNIT ns ns ns SN54AC245, SN74AC245 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SCAS461D – FEBRUARY 1995 – REVISED DECEMBER 1996 " switching characteristics over recommended operating free-air temperature range, 5 V (unless otherwise noted) (see Figure 1) VCC = 5 V PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A or B B or A tPZH tPZL OE A or B tPHZ tPLZ OE A or B MIN TA = 25°C TYP MAX SN54AC245 SN74AC245 MIN MAX MIN MAX 1.5 3.5 6.5 1 8.5 1 7 1.5 3.5 6 1 7.5 1 7 1.5 5 8.5 1 10 1 9 1.5 5.5 9 1 10.5 1 9.5 1.5 5.5 9 1 10.5 1 10 1.5 5.5 9 1 10.5 1 10 UNIT ns ns ns operating characteristics, VCC = 5 V, TA = 25°C PARAMETER Cpd TEST CONDITIONS Power dissipation capacitance per transceiver CL = 50 pF, TYP UNIT 45 pF f = 1 MHz PARAMETER MEASUREMENT INFORMATION 2 × VCC S1 500 Ω From Output Under Test Open TEST S1 tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open 2 × VCC Open 500 Ω CL = 50 pF (see Note A) LOAD CIRCUIT VCC Input 50% 50% 0V tPHL tPLH In-Phase Output 50% VCC tPHL Out-of-Phase Output 50% VCC VOH 50% VCC VOL tPLH VOH 50% VCC VOL Output Control (low-level enabling) VCC 50% VCC 0V tPZL [ VCC tPLZ Output Waveform 1 S1 at 2 × VCC (see Note B) Output Waveform 2 S1 at Open (see Note B) 50% VCC 50% VCC VOL + 0.3 V VOL tPHZ tPZH 50% VCC VOH – 0.3 V VOH [0 V VOLTAGE WAVEFORMS VOLTAGE WAVEFORMS 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 ≤ 1 MHz, ZO = 50 Ω, tr 2.5 ns, tf 2.5 ns. D. The outputs are measured one at a time with one input transition per measurement. v v Figure 1. Load Circuit and Voltage Waveforms POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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