74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 D D D D D D D, N, OR PW PACKAGE (TOP VIEW) Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems Incorporates Three Enable Inputs to Simplify Cascading and/or Data Reception Center-Pin VCC and GND Configurations Minimize High-Speed Switching Noise EPIC (Enhanced-Performance Implanted CMOS) 1-µm Process 500-mA Typical Latch-Up Immunity at 125°C Package Options Include Plastic Small-Outline (D) and Thin Shrink Small-Outline (PW) Packages, and Standard Plastic 300-mil DIPs (N) Y1 Y2 Y3 GND Y4 Y5 Y6 Y7 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 Y0 A B C VCC G1 G2A G2B description The 74AC11138 circuit is designed to be used in high-performance memory-decoding or data-routing applications requiring very short propagation delay times. In high-performance memory systems, this decoder can be used to minimize the effects of system decoding. When employed with high-speed memories utilizing a fast enable circuit, the delay times of this decoder and the enable time of the memory are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible. The conditions at the binary-select (A, B, C) inputs and the three enable (G1, G2A, G2B) inputs select one of eight output lines. Two active-low and one active-high enable inputs reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input for demultiplexing applications. The 74AC11138 is characterized for operation from –40°C to 85°C. FUNCTION TABLE ENABLE INPUTS SELECT INPUTS OUTPUTS G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 X H X X X X H H H H H H H Y7 H X X H X X X H H H H H H H H L X X X X X H H H H H H H H H L L L L L L H H H H H H H H L L L L H H L H H H H H H H L L L H L H H L H H H H H H L L L H H H H H L H H H H H L L H L L H H H H L H H H H L L H L H H H H H H L H H H L L H H L H H H H H H L H H L L H H H H H H H H H H L 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 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 1 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 logic symbols (alternatives)† A B C G1 15 14 13 BIN/OCT 1 0 2 1 4 3 & 11 4 10 EN G2A G2B 2 5 9 6 7 16 1 2 3 5 6 7 8 Y0 A Y1 B C Y2 15 13 G1 Y5 G2A Y6 G2B 11 16 0 14 Y3 Y4 DMUX 0 G 0 7 1 1 2 2 2 3 3 & 5 4 10 6 5 9 7 6 Y7 8 7 † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. logic diagram (positive logic) 16 A Y0 15 1 Y1 2 Select Inputs B Y2 14 3 5 C 7 Enable Inputs G2B G1 2 Data Outputs Y4 13 6 G2A Y3 10 8 9 11 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • Y5 Y6 Y7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 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): D package . . . . . . . . . . . . . . . . . . . . 1.3 W N package . . . . . . . . . . . . . . . . . . . . 1.1 W PW package . . . . . . . . . . . . . . . . . . . 0.5 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. recommended operating conditions 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 Low-level input voltage MIN NOM MAX 3 5 5.5 3.85 0.9 1.35 0 0 Input transition rise or fall rate TA Operating free-air temperature VCC = 3 V VCC = 4.5 V • • VCC VCC V V –4 –24 VCC = 5.5 V VCC = 3 V –24 VCC = 4.5 V VCC = 5.5 V 24 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 V 1.65 Output voltage ∆t/∆v V 3.15 Input voltage Low-level output current V 2.1 VCC = 4.5 V VCC = 5.5 V High-level output current UNIT mA 12 mA 24 0 10 ns/V –40 85 °C 3 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VCC IOH = –50 µA VOH IOH = –4 mA Ci MIN 3V 2.9 2.9 4.5 V 4.4 4.4 5.5 V 5.4 5.4 3V 2.58 2.48 3.94 3.8 IOH = –24 24 mA A 5.5 V 4.94 4.8 IOH = –75 mA† 5.5 V IOL = 12 mA IOL = 24 mA II ICC TA = 25°C TYP MAX 4.5 V IOL = 50 µA VOL MIN IOL = 75 mA† VI = VCC or GND IO = 0 UNIT V 3.85 3V 0.1 0.1 4.5 V 0.1 0.1 5.5 V 0.1 0.1 3V 0.36 0.44 4.5 V 0.36 0.44 5.5 V 0.36 0.44 5.5 V VI = VCC or GND, VI = VCC or GND MAX V 1.65 5.5 V ±0.1 ±1 µA 5.5 V 4 40 µA 5V 3.5 pF † Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms. switching characteristics over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A B, A, B C Any Y tPLH tPHL G1 Any Y G2A G2B G2A, Any Y tPLH tPHL MIN TA = 25°C TYP MAX MIN MAX 1.5 8.3 10.2 1.5 11.4 1.5 8.9 10.9 1.5 12.2 1.5 7.2 9.2 1.5 10.2 1.5 7.3 9.4 1.5 10.5 1.5 8.2 10.4 1.5 11.5 1.5 8.3 10.4 1.5 11.6 UNIT ns ns ns switching characteristics over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) 4 PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A B, B C A, Any Y tPLH tPHL G1 Any Y tPLH tPHL G2A G2B G2A, Any Y • TA = 25°C MIN TYP MAX POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • MIN MAX 1.5 5.7 7.3 1.5 8.1 1.5 6.2 7.9 1.5 8.8 1.5 5.1 6.9 1.5 7.5 1.5 5.2 6.9 1.5 7.7 1.5 5.8 7.6 1.5 8.3 1.5 5.6 7.5 1.5 8.3 UNIT ns ns ns 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 operating characteristics, VCC = 5 V, TA = 25°C PARAMETER Cpd TEST CONDITIONS Power dissipation capacitance per gate CL = 50 pF, TYP f = 1 MHz 51 UNIT pF PARAMETER MEASUREMENT INFORMATION VCC Input (see Note B) From Output Under Test CL = 50 pF (see Note A) 50% VCC 50% VCC tPHL 500 Ω 0V tPLH 50% VCC Output VOH 50% VCC VOL VOLTAGE WAVEFORMS LOAD CIRCUIT NOTES: A. CL includes probe and jig capacitance. B. Input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 ns. C. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 5 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 APPLICATION INFORMATION 74AC11138 BIN/OCT 15 14 13 1 2 2 4 11 VCC 0 1 3 & 4 10 EN 9 5 6 7 16 1 2 3 5 6 7 8 0 1 2 3 4 5 6 7 74AC11138 BIN/OCT 15 A0 14 A1 13 A2 1 2 2 4 11 A3 0 1 3 & 4 10 A4 EN 9 5 6 7 16 1 2 3 5 6 7 8 8 9 10 11 12 13 14 15 74AC11138 BIN/OCT 15 14 13 11 0 1 1 2 2 4 3 & 4 10 9 EN 5 6 7 Figure 2. 24-Bit Decoding Scheme 6 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 16 1 2 3 5 6 7 8 16 17 18 19 20 21 22 23 74AC11138 3-LINE TO 8-LINE DECODER/DEMULTIPLEXER SCAS042B – MAY 1988 – REVISED APRIL 1996 APPLICATION INFORMATION 74AC11138 BIN/OCT 15 A0 14 A1 13 A2 1 1 2 2 4 11 VCC 0 3 & 4 10 A3 EN 9 A4 5 6 7 16 1 2 3 5 6 7 8 0 1 2 3 4 5 6 7 74AC11138 BIN/OCT 15 14 13 0 1 1 2 2 4 11 3 & 4 10 EN 9 5 6 7 16 1 2 3 5 6 7 8 8 9 10 11 12 13 14 15 74AC11138 BIN/OCT 15 14 13 0 1 1 2 2 4 11 3 & 4 10 EN 9 5 6 7 16 1 2 3 5 6 7 8 16 17 18 19 20 21 22 23 74AC11138 BIN/OCT 15 14 13 11 0 1 1 2 2 4 3 & 4 10 9 EN 5 6 7 16 1 2 3 5 6 7 8 24 25 26 27 28 29 30 31 Figure 3. 32-Bit Decoding Scheme • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443 • 7 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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