SN54F138, SN74F138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDFS051B – MARCH 1987 – REVISED JULY 1996 D D D Designed Specifically for High-Speed Memory Decoders and Data Transmission Systems Incorporates Three Enable Inputs to Simplify Cascading and/or Data Reception Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs SN54F138 . . . J PACKAGE SN74F138 . . . D OR N PACKAGE (TOP VIEW) A B C G2A G2B G1 Y7 GND description 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC Y0 Y1 Y2 Y3 Y4 Y5 Y6 SN54F138 . . . FK PACKAGE (TOP VIEW) B A NC VCC Y0 The ′F138 is designed to be used in high-performance memory-decoding or datarouting applications requiring very short propagation delay times. In high-performance memory systems, these decoders 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. 1 C G2A NC G2B G1 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 Y1 Y2 NC Y3 Y4 Y7 GND NC Y6 Y5 The conditions at the binary-select inputs and the three enable inputs select one of eight output lines. Two active-low and one active-high enable NC – No internal connection 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 SN54F138 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74F138 is characterized for operation from 0°C to 70°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. 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 SN54F138, SN74F138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDFS051B – MARCH 1987 – REVISED JULY 1996 FUNCTION TABLE ENABLE INPUTS G1 G2A X X SELECT INPUTS OUTPUTS G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 H X X X X H H H H H H H H 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 logic symbols (alternatives)† A B C G1 1 2 3 6 4 G2A G2B 5 BIN/OCT 1 0 2 1 4 2 3 & 4 EN 5 6 7 15 14 13 12 11 10 9 7 Y0 A Y1 B Y2 C 1 G1 Y5 G2A Y6 G2B 3 6 4 5 Y7 POST OFFICE BOX 655303 G 2 0 7 1 2 & 3 4 5 6 7 † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 2 0 2 Y3 Y4 DMUX 0 • DALLAS, TEXAS 75265 15 14 13 12 11 10 9 7 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 SN54F138, SN74F138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDFS051B – MARCH 1987 – REVISED JULY 1996 logic diagram (positive logic) 15 A 1 14 Select Inputs B C 13 3 12 10 Enable Inputs 6 9 4 7 G2A G2B Y1 2 11 G1 Y0 Y2 Y3 Data Outputs Y4 Y5 Y6 Y7 5 Pin numbers shown are for the D, J, and N packages. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN54F138, SN74F138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDFS051B – MARCH 1987 – REVISED JULY 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 1.2 V to 7 V Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 30 mA to 5 mA Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA Operating free-air temperature range: SN54F138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74F138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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. NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed. recommended operating conditions SN54F138 VCC VIH Supply voltage VIL IIK Low-level input voltage IOH IOL High-level output current Low-level output current TA Operating free-air temperature High-level input voltage SN74F138 MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 2 2 Input clamp current – 55 UNIT V V 0.8 0.8 V – 18 – 18 mA –1 –1 mA 20 20 mA 70 °C 125 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL II IIH IIL IOS§ ICC TEST CONDITIONS VCC = 4.5 V, VCC = 4.5 V, II = – 18 mA IOH = – 1 mA VCC = 4.75 V, VCC = 4.5 V, IOH = – 1 mA IOL = 20 mA VCC = 5.5 V, VCC = 5.5 V, VI = 7 V VI = 2.7 V VCC = 5.5 V, VCC = 5.5 V, VI = 0.5 V VO = 0 SN54F138 TYP‡ MAX MIN SN74F138 TYP‡ MAX MIN – 1.2 2.5 3.4 – 1.2 2.5 3.4 0.5 0.3 0.5 V 0.1 0.1 mA 20 20 µA – 0.6 mA –150 mA 20 mA – 0.6 – 60 –150 – 60 VCC = 5.5 V, See Note 2 13 20 13 ‡ All typical values are at VCC = 5 V, TA = 25°C. § Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second. NOTE 2: ICC is measured with outputs enabled and open. 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 V V 2.7 0.3 UNIT SN54F138, SN74F138 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS SDFS051B – MARCH 1987 – REVISED JULY 1996 switching characteristics (see Note 3) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 PF, RL = 500 Ω, TA = 25°C VCC = 4.5 V TO 5.5 V, CL = 50 PF, RL = 500 Ω, TA = MIN TO MAX† ′F138 tPLH tPHL A B, A, B or C Y tPLH tPHL G2A or G2B Y tPLH tPHL G1 Y UNIT SN54F138 SN74F138 MIN TYP MAX MIN MAX MIN MAX 2.7 5.2 7.5 2.7 12 2.7 8.5 3.2 5.7 8 3.2 9.5 3.2 9 2.7 5 7 2.7 11 2.7 8 2.2 4.9 7 2.2 8 2.2 7.5 3.2 5.8 8 3.2 12.5 3.2 9 2.7 5.2 7.5 2.7 8.5 2.7 8.5 ns ns ns † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 3: Load circuits and waveforms are shown in Section 1. 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