74AC11873 DUAL 4-BIT D-TYPE LATCH WITH 3-STATE OUTPUTS SCAS095 JANUARY 1990 REVISED APRIL 1993
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1 3-State Buffer-Type s Drive Bus Lines Directly Bus-Structured Pinout Flow-Through Architecture Optimizes PCB Layout Center-Pin V CC and Configuratio Minimize High-Speed Switching Noise EPIC (Enhanced-Performance Implanted CMOS) 1-µm Process 500-mA Typical Latch-Up Immunity at 125 C description This dual 4-bit traparent D-type latch features 3-state outputs designed specifically for bus driving. This makes these devices particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 When the latch-enable (1LE or 2LE) input is high, the outputs will follow the data (D) inputs in true form, according to the function table. When LE is taken low, the outputs will be latched. When the clear (1CL or 2CL) input goes low, the outputs go low independently of LE. The outputs are in a high-impedance state when the output-control (1 or 2) input is at a high logic level. The 74A1873 is characterized for operation from 40 C to 85 C. FUNCTION TABLE (each 4-bit latch) INPUTS OUTPUT CL LE D L L X X L L H H H H L H H L L L H L X 0 H X X X Z 1LE LE DW PACKAGE (TOP VIEW) CL V CC V CC 2D1 2D2 2D3 2D4 2CL 2 EPIC is a trademark of Texas Itruments Incorporated. PODUCTION DATA information is current as of publication date. Products conform to specificatio per the terms of Texas Itruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright 1993, Texas Itruments Incorporated 2 1
2 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 logic symbol logic diagram, each quad latch (positive logic) 1 1LE 1CL EN LE CL D LE 2CL 2D1 2D2 2D3 2D EN This symbol is in accordance with ANSI/IEEE Std and IEC Publication D2 D3 D absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage range, V CC V to 7 V Input voltage range, V I (see Note 1) V to V CC V voltage range, V O (see Note 1) V to V CC V Input clamp current, I IK (V I < 0 or V I > V CC ) ±20 ma clamp current, I OK (V O < 0 or V O > V CC ) ±50 ma Continuous output current, I O (V O = 0 to V CC ) ±50 ma Continuous current through V CC or ±200 ma Storage temperature range 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 conditio beyond those indicated under recommended operating conditio is not implied. Exposure to absolute-maximum-rated conditio for extended periods may affect device reliability. NOTE 1: The input and output voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 2 2
3 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 recommended operating conditio MIN NOM MAX UNIT Supply voltage V = 3 V 2.1 VIH High-level input voltage = 4.5 V 3.15 V = 5.5 V 3.85 = 3 V 0.9 VIL Low-level input voltage = 4.5 V 1.35 V = 5.5 V 1.65 VI Input voltage 0 V VO voltage 0 V = 3 V 4 IOH High-level output current = 4.5 V 24 ma = 5.5 V 24 = 3 V 12 IOL Low-level output current = 4.5 V 24 ma = 5.5 V 24 t/ v Input traition rise or fall rate 0 10 / V TA Operating free-air temperature C electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PAAMETE TEST CONDITIONS MIN TYP MAX 3 V IOH = 50 µa 4.5 V V VOH IOH = 4 ma 3 V V 4.5 V IOH = 24 ma 5.5 V IOH = 75 ma 5.5 V V IOL = 50 µa 4.5 V V VOL IOL = 12 ma 3 V V 4.5 V IOL =24mA 5.5 V IOL = 75 ma 5.5 V 1.65 II VI = or 5.5 V ±0.1 ±1 µa IOZ VO = or 5.5 V ±0.5 ±5 µa ICC VI = or, IO = V 8 80 µa Ci VI = or 5 V 4.5 pf Co VO = or 5 V 13.5 pf Not more than one output should be tested at a time, and the duration of the test should not exceed 10 ms. 2 3
4 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 timing requirements over recommended operating free-air temperature range, V CC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) tw tsu th Pulse duration Setup time, data before LE Hold time, data after LE MIN MAX CL low 5 5 LE high 5 5 HIgh 3 3 Low 4 4 High 1 1 Low 1 1 timing requirements over recommended operating free-air temperature range, V CC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) tw tsu th Pulse duration Setup time, data before LE Hold time, data after LE MIN MAX CL low 5 5 LE high 5 5 HIgh 2 2 Low 3 3 High 1 1 Low 1 1 switching characteristics over recommended operating free-air temperature range, V CC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PAAMETE FOM TO (INPUT) (OUTPUT) MIN TYP MAX D LE CL tpzh tpzl tphz tplz
5 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 switching characteristics over recommended operating free-air temperature range, V CC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) PAAMETE FOM TO (INPUT) (OUTPUT) MIN TYP MAX D LE CL tpzh tpzl tphz tplz operating characteristics, V CC = 5 V, T A = 25 C Cpd PAAMETE TEST CONDITIONS TYP UNIT s enabled 43 Power dissipation capacitance per latch CL =50pF pf, f=1mhz pf s disabled 9 2 5
6 74A1873 SCAS095 JANUAY 1990 EVISED APIL 1993 PAAMETE MEASUEMENT INFOMATION From Under Test CL = 50 pf (see Note A) 500 Ω 500 Ω S1 2 Open TEST / tplz/tpzl tphz/tpzh S1 Open 2 LOAD CICUIT Input tw Timing Input (see Note B) Data Input tsu th VOLTAGE WAVEFOMS VOLTAGE WAVEFOMS Input (see Note B) In-Phase Out-of-Phase VOH VOL VOH VOL Control (low-level enabling) Waveform 1 S1 at 2 (see Note C) Waveform 2 S1 at (see Note C) tpzl tpzh tplz tphz 20% 80% VOL VOH VOLTAGE WAVEFOMS VOLTAGE WAVEFOMS NOTES: A. CL includes probe and jig capacitance. B. All input pulses are supplied by generators having the following characteristics: P 10 MHz, ZO = 50 Ω, tr = 3, tf = 3. C. Waveform 1 is for an output with internal conditio such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditio such that the output is high except when disabled by the output control. D. The outputs are measured one at a time with one input traition per measurement. Figure 1. Load Circuit and Voltage Waveforms 2 6
7 IMPOTANT NOTICE Texas Itruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. TI warrants performance of its semiconductor products and related software to the specificatio applicable at the time of sale in accordance with TI s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Certain applicatio using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage ( Critical Applicatio ). TI SEMICONDUCTO PODUCTS AE NOT DESIGNED, INTENDED, AUTHOIZED, O WAANTED TO BE SUITABLE FO USE IN LIFE-SUPPOT APPLICATIONS, DEVICES O SYSTEMS O OTHE CITICAL APPLICATIONS. Inclusion of TI products in such applicatio is understood to be fully at the risk of the customer. Use of TI products in such applicatio requires the written approval of an appropriate TI officer. uestio concerning potential risk applicatio should be directed to TI through a local SC sales office. In order to minimize risks associated with the customer s applicatio, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applicatio assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that any licee, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. Copyright 1996, Texas Itruments Incorporated
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More informationEN: This Datasheet is presented by the m anufacturer. Please v isit our website for pricing and availability at ore.hu.
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