SN75138DR

SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 D D D D D D D D Single 5-V Supply High-Input-Impedance, High-Threshold Receivers Common Driver Strobe TTL-Compatible Driver and Strobe Inputs With Clamp Diodes High-Speed Operation 100-mA Open-Collector Driver Outputs Four Independent Channels TTL-Compatible Receiver Output SN55138 . . . J OR W PACKAGE SN75138 . . . D OR N PACKAGE (TOP VIEW) GND 1B 1R 1D 2D 2R 2B GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 4B 4R 4D S 3D 3R 3B description SN55138 . . . FK PACKAGE 1B GND NC VCC 4B (TOP VIEW) 1R 1D NC 2D 2R 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 4R 4D NC S 3D 2B GND NC 3B 3R The SN55138 and SN75138 quadruple bus transceivers are designed for two-way data communication over single-ended transmission lines. Each of the four identical channels consists of a driver with TTL inputs and a receiver with a TTL output. The driver open-collector output is designed to handle loads up to 100-mA open collector. The receiver input is internally connected to the driver output, and has a high impedance to minimize loading of the transmission line. Because of the high driveroutput current and the high receiver-input impedance, a very large number (typically hundreds) of transceivers may be connected to a single data bus. NC – No internal connection The receiver design also features a threshold of 2.3 V (typical), providing a wider noise margin than would be possible with a receiver having the usual TTL threshold. A strobe turns off all drivers (high impedance) but does not affect receiver operation. These circuits are designed for operation from a single 5-V supply and include a provision to minimize loading of the data bus when the power-supply voltage is zero. The SN55138 is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN75138 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  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 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 Function Tables TRANSMITTING INPUTS S D L L OUTPUTS B R H L H L H L RECEIVING INPUTS OUTPUT R S B D H H X L H L X H H = high level, L = low level, X = irrelevant logic symbol† S 1D 1R 2D 2R 3D 3R 4D 4R 12 logic diagram (positive logic) S EN2 4 3 2 2 1B 1D 1 7 5 1R 9 2 4 2D 3B 2R 7 5 15 4B 3D 14 3R † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for D, J, N, and W packages. 4D 4R 9 11 VCC EQUIVALENT OF EACH RECEIVER INPUT 15 13 14 TYPICAL OF ALL DRIVER OUTPUTS VCC Input TYPICAL OF ALL RECEIVER OUTPUTS VCC 130 Ω NOM 4 kΩ NOM Input 2 kΩ NOM Output Output 2 POST OFFICE BOX 655303 3B 10 schematics of inputs and outputs EQUIVALENT OF EACH STROBE AND DRIVER INPUT 2B 6 10 13 1B 3 2B 6 11 12 • DALLAS, TEXAS 75265 4B SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 absolute maximum ratings over operating free-air temperature (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Driver off-state output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Low-level output current into the driver output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range, TA: SN55138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN75138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, N, or W package . . . . . . . . . . . . . 260°C Case temperature for 60 seconds, TC: FK package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°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: All voltage values are with respect to both ground terminals connected together. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING D FK‡ J‡ 1375 mW DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 125°C POWER RATING 950 mW 7.6 mW/°C 608 mW — 1375 mW 11.0 mW/°C 880 mW 275 mW 11.0 mW/°C 880 mW 275 mW N 1150 mW 9.2 mW/°C 736 mW — W 1000 mW 8.0 mW/°C 640 mW 200 mW ‡ In the FK and J packages, the SN55138 chip is alloy mounted. recommended operating conditions SN55138 MIN Supply voltage, VCC High level input voltage, High-level voltage VIH Low level input voltage, Low-level voltage VIL High-level output current, IOH Low level output current, Low-level current IOL NOM 4.5 Driver or strobe Receiver SN75138 MAX MIN NOM MAX 5.5 4.75 5 5.25 2 2 3.2 2.9 0.8 0.8 Receiver 1.5 1.8 – 400 – 400 100 100 16 16 Driver output Receiver output Operating free-air temperature, TA – 55 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 125 0 V V Driver or strobe Receiver output UNIT 70 V µA mA °C 3 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) TEST CONDITIONS† PARAMETER MIN VIK Input clamp voltage Driver or strobe VCC = MIN, II = – 12 mA VOH High-level output voltage Receiver VCC = MIN, VIL(R) = VIL max, VIH(S) = 2 V, IOH = – 400 µA Driver VOL Low-level out ut output voltage VCC = MIN, VIL(S) = 0.8 V, VIH(D) = 2 V, IOL = 100 mA Receiver VCC = MIN, VIH(S) = 2 V, VIH(R) = VIH min, IOL = 16 mA Driver or strobe VCC = MAX, Driver or strobe II(max) Input current at maximum input voltage IIH High-level g input current IIL Low-level input current SN75138 TYP‡ MAX –1.5 2.4 3.5 –1.5 2.4 3.5 UNIT V V 0.45 0.4 0.4 VI = VCC 1 1 VCC = MAX, VI = 2.4 V 40 40 Receiver VCC = 5 V, VI(S) = 2 V VI(R) = 4.5 V, 25 300 25 300 Driver or strobe VCC = MAX, VI = 0.4 V –1 –1.6 –1 –1.6 mA Receiver VCC = MAX, VI(S) = 2 V VI(R) = 0.45 V, – 50 µA VI = 4 4.5 5V 15 1.5 mA – 55 mA Input current with power ower off Receiver VCC = 0 0, IOS Short-circuit output out ut current§ Receiver VCC = MAX All driver outputs low VCC = MAX, VI(S) = 0.8 V All driver outputs out uts high VCC = MAX, VI(R) = 3.5 V, VI(S) = 2 V, V Receiver outputs open ICC MIN 0.45 II( ff) I(off) Supply current SN55138 TYP‡ MAX V mA µA – 50 11 1.1 – 20 15 1.5 – 55 VI(D) = 2 V, 11 1.1 – 18 50 65 50 65 42 55 42 55 mA † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. Parenthetical letters D, R, and S used with VI refer to the driver input, receiver input, and strobe input, respectively. ‡ All typical values are at VCC = 5 V, TA = 25°C. § Not more than one output should be shorted at a time. switching characteristics, VCC = 5 V, TA = 25°C PARAMETER¶ FROM (INPUT) TO (OUTPUT) tPLH tPHL Driver Driver tPLH tPHL Strobe Driver tPLH tPHL Receiver Receiver TEST CONDITIONS pF CL = 50 pF, CL = 15 pF RL = 50 Ω Ω, RL = 400 Ω Ω, ¶ tPLH = propagation delay time, low- to high-level output tPHL = propagation delay time, high- to low-level output 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 See Figure 1 See Figure 2 MIN TYP MAX 15 24 14 24 18 28 22 32 7 15 8 15 UNIT ns ns ns SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 PARAMETER MEASUREMENT INFORMATION VCC RL From Output Under Test Test Point CL (see Note B) TEST CIRCUIT Driver Input See Note D 3V 1.5 V 1.5 V Strobe Input 0V tPLH tPHL VOH 2.5 V 2.5 V Driver Output VOL VOLTAGE WAVEFORMS NOTES: A. Input pulses are supplied by generators having the following characteristics: tw = 100 ns, PRR ≤ 1 MHz, tr ≤ 10 ns, tf ≤ 10 ns, ZO ≈ 50 Ω. B. CL includes probe and jig capacitance. C. All diodes are 1N916 or 1N3064. D. When testing driver input (solid line) strobe must be low; when testing strobe input (dashed line) driver input must be high. Figure 1. Propagation Delay Times From Data and Strobe Inputs POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 PARAMETER MEASUREMENT INFORMATION Test Point VCC RL From Output Under Test See Note C CL (see Note B) TEST CIRCUIT 4V Receiver Input 2.5 V 2.5 V 0V tPLH tPHL VOH Receiver Output 1.5 V 1.5 V VOL VOLTAGE WAVEFORMS NOTES: A. Input pulses are supplied by generators having the following characteristics: tw = 100 ns, PRR ≤ 1 MHz, tr ≤ 10 ns, tf ≤ 10 ns, ZO ≈ 50 Ω. B. CL includes probe and jig capacitance. C. All diodes are 1N916 or 1N3064. D. When testing driver input (solid line) strobe must be low; when testing strobe input (dashed line) driver input must be high. Figure 2. Propagation Delay Times From Receiver Input 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 TYPICAL CHARACTERISTICS† DRIVER TRANSFER CHARACTERISTICS DRIVER TRANSFER CHARACTERISTICS 6 6 5 VO(D) VO(D) – Driver Output Voltage – V VO(D) VO(D) – Driver Output Voltage – V VCC = 5.5 V VCC = 5 V VI(S) = 0.8 V 4 TA = 25°C 3 TA = 125°C TA = – 55°C 2 1 0 0 1 2 3 VCC = 4.5 V 4 3 2 1 0 4 0 1 VI(D) – Driver Input Voltage – V 5 5 VO(D) VO(D) – Driver Output Voltage – V VO(D) VO(D) – Driver Output Voltage – V 6 TA = 125°C 4 TA = 25°C 3 VCC = 5 V VI(D) = 2 V Load = 50 Ω to VCC 1 VCC = 5.5 V VCC = 5 V VCC = 4.5 V 4 3 VI(D) = 2 V TA = 25°C Load = 50 Ω to VCC 2 1 TA = – 55°C VCC = 5.5 V 0 0 2 4 STROBE-TO-DRIVER OUTPUT TRANSFER CHARACTERISTICS 6 1 3 Figure 4 STROBE-TO-DRIVER OUTPUT TRANSFER CHARACTERISTICS 0 2 VI(D) – Driver Input Voltage – V Figure 3 2 VI(S) = 0.8 V TA = 25°C Load = 50 Ω to VCC VCC = 5 V 5 3 4 0 1 VCC = 4.5 V 2 3 4 VI(S) – Strobe Input Voltage – V VI(S) – Strobe Input Voltage – V Figure 6 Figure 5 † Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 TYPICAL CHARACTERISTICS† RECEIVER TRANSFER CHARACTERISTICS VCC = 5 V Load: R 10 kΩ 4 All Diodes 1N914 3 2 TA = 25°C 1 TA = 25°C Load: 5V 400 Ω 5 RECEIVER TRANSFER CHARACTERISTICS 6 VO(R) VO(R) – Receiver Output Voltage – V VO(R) VO(R) – Receiver Output Voltage – V 6 TA = – 55°C TA = 125°C 0 400 Ω 5 R VCC = 5.5 V VCC = 5 V All Diodes 1N914 VCC = 4.5 V 3 2 1 1 2 3 VI(R) – Receiver Input Voltage – V 0 4 1 2 3 VI(R) – Receiver Input Voltage – V Figure 7 HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT (RECEIVER) 5 5 VOH – High–Level Output Voltage – V VCC = 5 V 4 TA = 125°C TA = 25°C 3 2 4 Figure 8 HIGH-LEVEL OUTPUT VOLTAGE vs HIGH-LEVEL OUTPUT CURRENT (RECEIVER) VOH – High–Level Output Voltage – V 10 kΩ 4 0 0 TA = – 55°C 1 VI(R) = 0.8 V TA = 25°C 4 3 VCC = 5.5 V 2 VCC = 5 V 1 VCC = 4.5 V 0 0 0 5 10 15 20 25 30 35 40 0 IOH(R) – High-Level Output Current – mA 5 10 15 20 Figure 10 † Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only. POST OFFICE BOX 655303 25 30 35 IOH(R) – High-Level Output Current – mA Figure 9 8 5V • DALLAS, TEXAS 75265 40 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 TYPICAL CHARACTERISTICS† LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT (RECEIVER) Á Á 1.2 VCC = 4.5 V VI(R) = 3.5 V 1 VOL(R) VOL – Low-Level Output Voltage – V VOL(R) VOL – Low-Level Output Voltage – V 1.2 TA = – 55°C 0.8 LOW-LEVEL OUTPUT VOLTAGE vs LOW-LEVEL OUTPUT CURRENT (DRIVER) TA = 125°C 0.6 TA = 25°C 0.4 0.2 VCC = 4.5 V VI(D) = 2 V VI(S) = 0.8 V 1 TA = – 55°C 0.8 0.6 TA = 125°C 0.4 0.2 0 0 0 10 20 30 40 50 0 60 50 100 150 200 250 300 IOL(D) – Low-Level Output Current – mA IOL(R) – Low-Level Output Current – mA Figure 11 Figure 12 RECEIVER INPUT CURRENT vs RECEIVER INPUT VOLTAGE RECEIVER INPUT CURRENT vs RECEIVER INPUT VOLTAGE 1.6 1.6 VCC = 5 V VI(S) = 2 V 1.4 TA = 125°C, 25°C III(R) I(R) – Receiver Input Current – mA III(R) I(R) – Receiver Input Current – mA TA = 25°C 1.2 TA = – 55°C 1 0.8 0.6 0.4 VI(S) = 2 V TA = 25°C 1.4 1.2 1 0.8 VCC = 4.5 V 0.6 VCC = 5 V 0.4 VCC = 5.5 V 0.2 0.2 TA = 125°C ÁÁ ÁÁ ÁÁ ÁÁ ÁÁ TA = 25°C, – 55°C 0 0 0 1 2 3 4 5 VI(R) – Receiver Input Voltage – V 6 0 Figure 13 1 2 3 4 5 VI(R) – Receiver Input Voltage – V 6 Figure 14 † Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 9 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 TYPICAL CHARACTERISTICS† SUPPLY CURRENT vs SUPPLY VOLTAGE (ALL DRIVER OUTPUTS LOW) SUPPLY CURRENT vs SUPPLY VOLTAGE 80 80 VI(S) = 0.8 V VI(D) = 2 V Driver Loads = 1 kΩ to 5 V 60 TA = 25°C 50 TA = 25°C VI(S) = 0.8 V Driver Loads = 1 kΩ to 5 V R Output Open 70 IICC CC – Supply Current – mA I CC ICC – Supply Current – mA 70 TA = 125°C 40 30 TA = – 55°C 20 10 60 4 Driver Inputs at 2 V 50 2 Driver Inputs at 2 V, 2 Driver Inputs at 0.8 V 40 4 Driver Inputs at 0.8 V 30 20 10 0 0 1 2 3 4 5 6 7 0 8 1 0 VCC – Supply Voltage – V Figure 15 30 tPHL(S-D) tPLH(S-D) tPLH(D-D) 16 tPHL(D-D) 12 tPLH(R-R) 8 tPHL(R-R) 40 Propagation Delay Times – ns Propagation Delay Times – ns VCC = 5 V Driver Load: CL = 50 pF, RL = 50 Ω, See Figure 1 Receiver Load: CL = 15 pF, RL = 400 Ω, See Figure 2 20 8 PROPAGATION DELAY TIMES vs SUPPLY VOLTAGE 32 24 7 Figure 16 PROPAGATION DELAY TIMES vs FREE-AIR TEMPERATURE 28 2 3 4 5 6 VCC – Supply Voltage – V 20 ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁ TA = 25°C Driver Load: CL = 50 pF, RL = 50 Ω, See Figure 1 Receiver Load: CL = 15 pF, RL = 400 Ω, See Figure 2 tPHL(S-D) tPLH(S-D) tPLH(D-D) 15 tPHL(D-D) 10 tPHL(R-R) tPLH(R-R) 5 4 0 – 6 – 40 – 20 0 0 20 40 60 80 100 120 140 4.5 4.6 4.7 4.8 4.9 TA – Free-Air Temperature – °C Figure 17 Figure 18 † Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only. 10 5 POST OFFICE BOX 655303 5.1 5.2 5.3 5.4 5.5 VCC – Supply Voltage – V • DALLAS, TEXAS 75265 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 TYPICAL CHARACTERISTICS DRIVER RECEIVER PROPAGATION DELAY TIMES vs LOAD CAPACITANCE PROPAGATION DELAY TIMES vs LOAD CAPACITANCE 16 30 VCC = 5 V RL = 400 Ω, See Figure 2 TA = 25°C t pd – Propagation Delay Times – ns t pd – Propagation Delay Times – ns 14 25 tPHL(S-D) tPLH(S-D) 20 tPHL(D-D) 15 tPLH(D-D) 10 VCC = 5 V RL = 50 , See Figure 1 TA = 25_C W 5 12 tPHL(R-R) 10 0 0 20 tPLH(R-R) 8 6 4 2 0 40 60 80 100 120 140 160 180 200 CL – Load Capacitance – pF 0 10 Figure 19 20 30 40 50 60 CL – Load Capacitance – pF 70 80 Figure 20 APPLICATION INFORMATION 5V 5V P 100 Ω 100 Ω A 50 ft Belden #8795 100-Ω Telephone Cable B 1/4 SN55138 A D C 1/4 SN55138 3V 2V C 0V 2V 0V 5V 4V B 2V 5V 4V 4V D 0V 2V 0V TYPICAL VOLTAGE WAVEFORMS Figure 21. Point-to-Point Communication Over 50 Feet of Twisted Pair at 5 MHz POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 11 SN55138, SN75138 QUADRUPLE BUS TRANSCEIVERS SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995 APPLICATION INFORMATION 5V 5V 100 Ω 100 Ω 50 ft 100 ft 100 ft 250 ft A 1/4 SN55138 1/4 SN55138 1/4 SN55138 1/4 SN55138 B C P Belden #8795 Telephone Cable or Equivalent E 1/4 SN55138 D 4V 3V 2V A 2V D 0V 0V 4V 4V 2V B 2V E 0V 0V 4V 2V C 0V TYPICAL VOLTAGE WAVEFORMS Figure 22. Party-Line Communication on 500 Feet of Twisted Pair at 1 MHz 5V 5V 100 Ω A 1000 ft RG-53 100 Ω or Equivalent D 1/4 SN55138 A B C 1/4 SN55138 5V 4V 3V 2V C 2V 0V 0V 5V 4V B 2V D 0V 0V TYPICAL VOLTAGE WAVEFORMS Figure 23. Point-to-Point Communication Over 1000 Feet of Coaxial Cable at 1 MHz 12 POST OFFICE BOX 655303 3V 2V • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) SN75138D ACTIVE SOIC D 16 40 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 SN75138 SN75138DR ACTIVE SOIC D 16 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 SN75138 SN75138N ACTIVE PDIP N 16 25 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 SN75138N SN75138NSR ACTIVE SO NS 16 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 SN75138 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of