SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 • • • • • • D OR N PACKAGE (TOP VIEW) High-Speed fmax of 125 MHz Typical Single Down/Up Count Control Line Look-Ahead Circuitry Enhances Speed of Cascaded Counters Fully Synchronous in Count Modes Asynchronously Presettable With Load Control Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs B QB QA CTEN D/U QC QD GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC A CLK RCO MAX/MIN LOAD C D description The SN74F190A is a synchronous, 4-bit decade reversible up/down counter. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple-clock) counters. The outputs of the four flip-flops are triggered on a low-to-high-level transition of the clock (CLK) input if the enable (CTEN) input is low. A high at CTEN inhibits counting. The direction of the count is determined by the level of the down/up (D/U) input. When D/U is low, the counter counts up, and when D/U is high, it counts down. This counter features a fully independent clock circuit. Changes at the control (CTEN and D/U) inputs that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter is dictated solely by the condition meeting the stable setup and hold times. This counter is fully programmable; that is, it may be preset to any number between 0 and 9 by placing a low on the load input and entering the desired data at the data inputs. The output changes to agree with the data inputs independent of the level of the clock input. This feature allows the counter to be used as a modulo-N divider by simply modifying the count length with the preset inputs. Two outputs have been made available to perform the cascading function: ripple clock and maximum/minimum count. The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock while the count is minimum (0) counting down or maximum (9) counting up. The ripple-clock (RCO) output produces a low-level output pulse under those same conditions, but only while the clock input is low. The counter can easily be cascaded by feeding the ripple-clock output to the enable input of the succeeding counter if parallel clocking is used or to the clock input if parallel enabling is used. The maximum/minimum count (MAX/MIN) output can be used to accomplish look-ahead for high speed operation. The SN74F190A is characterized for operation from 0°C to 70°C. Copyright 1993, Texas Instruments Incorporated !"#$ % &'!!($ #% )'*+&#$ ,#$(!,'&$% &!" $ %)(&&#$% )(! $.( $(!"% (/#% %$!'"($% %$#,#!, 0#!!#$1- !,'&$ )!&(%%2 ,(% $ (&(%%#!+1 &+',( $(%$2 #++ )#!#"($(!%- • DALLAS, TEXAS 75265 • HOUSTON, TEXAS 77251−1443 POST OFFICE BOX 655303 POST OFFICE BOX 1443 2−1 SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 logic symbol† CTEN D/U CLK LOAD A B C D 4 5 14 11 15 1 G1 CTRDIV10 M2 [DOWN] 2(CT=0)Z6 3(CT=9)Z6 M3 [UP] 1,2− / 1,3+ G4 6,1,4 13 MAX/MIN RCO C5 [1] 5D [2] 10 [3] 9 [4] † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 2−2 12 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 3 2 6 7 QA QB QC QD SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 logic diagram(positive logic) 12 CTEN MAX/ MIN 4 13 RCO 5 D/U CLK 14 11 LOAD 15 A 3 S 1D R QA C1 1 B 2 S C1 1D R C QB 10 6 S QC C1 1D R D 9 7 S QD C1 1D R • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 2−3 SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 typical load, count, and inhibit sequences Illustrated below is the following sequence: 1. Load (preset) to BCD seven 2. Count up to eight, nine (maximum), zero, one, and two 3. Inhibit 4. Count down to one, zero (minimum), nine, eight, and seven LOAD A B Data Inputs C D CLK D/U CTEN QA QB QC QD MAX/MIN RCO 7 8 9 0 1 2 Count Up 2 2 Inhibit Load 2−4 • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 1 0 9 Count Down 8 7 SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 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 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 °C to 70 °C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 55°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 if the input-current ratings are observed. recommended operating conditions MIN NOM MAX 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL IIK Low-level input voltage 0.8 V Input clamp current 18 mA IOH IOL High-level output current −1 mA Low-level output current 20 mA TA Operating free-air temperature 70 °C High-level input voltage 2 V V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK VOH VOL II IIH 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 IIL VCC = 5.5 V, VI = 0.5 V IOS§ ICC VCC = 5.5 V, VCC = 5.5 V, VO = 0 Outputs open MIN TYP‡ 2.5 3.4 MAX UNIT − 1.2 V V 2.7 0.3 0.5 V 0.1 mA 20 µA CTEN − 1.8 Others − 0.6 − 60 40 mA − 150 mA 55 mA ‡ 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. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • 2−5 SDFS026B − D3690, JULY 1990 − REVISED OCTOBER 1993 timing requirements VCC = 5 V, TA = 25°C fclock tw tsu th MIN MAX MIN MAX 0 90 0 90 Clock frequency Pulse duration Setup time Hold time VCC = 4.5 V to 5.5 V, TA = MIN to MAX† LOAD low 6 6 CLK high 4 4 CLK low 7 7 Data before LOAD↑ 4 4 CTEN before CLK↑ 6.5 6.5 D/U before CLK↑ 15 15 LOAD inactive before CLK↑ 10 10 Data after LOAD↑ 2 2 CTEN after CLK↑ 1 1 D/U after CLK↑ 0 0 UNIT MHz ns ns ns switching characteristics (see Note ) PARAMETER FROM (INPUT) TO (OUTPUT) VCC = 5 V, CL = 50 pF, RL = 500 Ω, TA = 25°C MIN fmax tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH TYP VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX † MAX 90 CLK Any Q CLK MAX/MIN CLK RCO CTEN RCO D/U RCO D/U MAX/MIN A, B, C, or D Any Q A, B, C, or D MAX/MIN A, B, C, or D RCO LOAD Any Q LOAD MAX/MIN LOAD RCO MIN 2−6 • MHz 2.5 4.8 8 2 8.5 5 7 11.5 5 12 6.5 9.4 12.5 6 13 6 8.9 11 6 12 2.5 5.2 7.5 2 8 3 4.8 7.5 2.5 8 2 5.7 7 2 7.8 3 5 7.5 3 8 8 13 16 8 17.8 4.5 8.1 10.5 4 11 4 7.9 9.8 3 11.3 3 7.5 9.5 3 10 2 4.7 7 1.5 7.5 6.5 8.9 12 6.5 13 5.5 10.5 13.6 5 15.4 6.5 10 13 6 14 6 15 18.6 6 21.1 6 9.5 13.5 6 15 4.5 7.7 9.8 4 11.4 5.5 9.9 12.1 5 13.1 5.5 12.3 15.2 5.5 17 6 11.7 14 6 15.6 8.5 16.8 19.9 8.5 23.2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443 • MAX 90 tPHL 7.5 11.6 14 7 † For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 2: Load circuits and waveforms are shown in Section 1. UNIT 15.2 ns ns ns ns ns ns ns ns ns ns ns ns IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Information of third parties may be subject to additional restrictions. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. TI products are not authorized for use in safety-critical applications (such as life support) where a failure of the TI product would reasonably be expected to cause severe personal injury or death, unless officers of the parties have executed an agreement specifically governing such use. Buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of TI products in such safety-critical applications, notwithstanding any applications-related information or support that may be provided by TI. Further, Buyers must fully indemnify TI and its representatives against any damages arising out of the use of TI products in such safety-critical applications. TI products are neither designed nor intended for use in military/aerospace applications or environments unless the TI products are specifically designated by TI as military-grade or "enhanced plastic." Only products designated by TI as military-grade meet military specifications. Buyers acknowledge and agree that any such use of TI products which TI has not designated as military-grade is solely at the Buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. TI products are neither designed nor intended for use in automotive applications or environments unless the specific TI products are designated by TI as compliant with ISO/TS 16949 requirements. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, TI will not be responsible for any failure to meet such requirements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Amplifiers Data Converters DSP Clocks and Timers Interface Logic Power Mgmt Microcontrollers RFID RF/IF and ZigBee® Solutions amplifier.ti.com dataconverter.ti.com dsp.ti.com www.ti.com/clocks interface.ti.com logic.ti.com power.ti.com microcontroller.ti.com www.ti-rfid.com www.ti.com/lprf Applications Audio Automotive Broadband Digital Control Medical Military Optical Networking Security Telephony Video & Imaging Wireless www.ti.com/audio www.ti.com/automotive www.ti.com/broadband www.ti.com/digitalcontrol www.ti.com/medical www.ti.com/military www.ti.com/opticalnetwork www.ti.com/security www.ti.com/telephony www.ti.com/video www.ti.com/wireless Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2008, Texas Instruments Incorporated