SN74F161ADBR

SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 D D D D, DB, OR N PACKAGE (TOP VIEW) Internal Look-Ahead Circuitry for Fast Counting Carry Output for N-Bit Cascading Fully Synchronous Operation for Counting CLR CLK A B C D ENP GND description 1 16 2 15 3 14 4 13 5 VCC RCO QA QB QC QD ENT LOAD 12 This synchronous, presettable, 4-bit binary 6 11 counter has internal carry look-ahead circuitry 7 10 for use in high-speed counting designs. 8 9 Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous (ripple-clock) counters. However, counting spikes can occur on the ripple-carry (RCO) output. A buffered clock (CLK) input triggers the four flip-flops on the rising (positive-going) edge of CLK. This counter is fully programmable. That is, it can be preset to any number between 0 and 15. Because presetting is synchronous, a low logic level at the load (LOAD) input disables the counter and causes the outputs to agree with the setup data after the next clock pulse, regardless of the levels of ENP and ENT. The clear function is asynchronous, and a low logic level at the clear (CLR) input sets all four of the flip-flop outputs to low, regardless of the levels of CLK, LOAD, ENP, and ENT. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications, without additional gating. This function is implemented by the ENP and ENT inputs and an RCO output. Both ENP and ENT must be high to count, and ENT is fed forward to enable RCO. RCO, thus enabled, produces a high-logic-level pulse while the count is 15 (HHHH). The high-logic-level overflow ripple-carry pulse can be used to enable successive cascaded stages. Transitions at ENP or ENT are allowed, regardless of the level of CLK. The SN74F161A features a fully independent clock circuit. Changes at ENP, ENT, or LOAD that modify the operating mode have no effect on the contents of the counter until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) is dictated solely by the conditions meeting the setup and hold times. ORDERING INFORMATION PACKAGE† TA PDIP – N 0°C to 70°C SOIC – D SSOP – DB ORDERABLE PART NUMBER Tube SN74F161AN Tube SN74F161AD Tape and reel SN74F161ADR Tape and reel SN74F161ADBR TOP-SIDE MARKING SN74F161AN F161A F161A † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. 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  2001, 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 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 state diagram 0 2 3 4 15 5 14 6 13 7 12 2 1 11 POST OFFICE BOX 655303 10 9 • DALLAS, TEXAS 75265 8 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 logic diagram (positive logic) CLR LOAD ENT ENP 1 9 10 15 7 RCO R 14 CLK A 2 3 G2 QA 1, 2T/C3 1, 3D M1 R 13 G2 QB 1, 2T/C3 B 4 1, 3D M1 R 12 G2 QC 1, 2T/C3 C 5 1, 3D M1 R 11 G2 QD 1, 2T/C3 D 6 1, 3D M1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 logic symbol, each flip-flop R TE R Q1 1, 2T/C3 CLK D Q1 G2 Q2 1, 3D Q2 LOAD M1 logic diagram, each flip-flop (positive logic) R TE (Toggle Enable) Q1 CLK Q2 D LOAD 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 typical clear, preset, count, and inhibit sequences The following timing sequence is illustrated below: 1. Clear outputs to zero 2. Preset to binary 12 3. Count to 13, 14, 15, 0, 1, and 2 4. Inhibit CLR LOAD A Data Inputs B C D CLK ENP ENT QA Data Outputs QB QC QD RCO 12 13 14 15 0 1 2 Count Inhibit Sync Preset Clear Async Clear POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 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 Package thermal impedance, θJA (see Note 2): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/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 voltage ratings may be exceeded provided the input current ratings are observed. 2. The package thermal impedance is calculated in accordance with JESD 51-7. recommended operating conditions (see Note 3) 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 High-level input voltage 2 V V TA Operating free-air temperature 0 70 °C NOTE 3: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. 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 MIN 2.5 TYP‡ ENT, LOAD 0.3 V 0.5 V 0.1 mA 20 µA – 0.6 VCC = 5.5 V, VI = 0.5 V – 1.2 mA – 0.6 VCC = 5.5 V, VCC = 5.5 V VO = 0 – 60 37 ‡ 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. 6 V 2.7 CLR IOS§ ICC UNIT – 1.2 3.4 ENP, CLK, A, B, C, D IIL MAX POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 –150 mA 55 mA SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 timing requirements over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) VCC = 5 V, TA = 25°C fclock Clock frequency CLK high or low (loading) tw Pulse duration CLK (counting) tsu ENP and ENT before CLK↑ Data after CLK↑ th Hold time LOAD after CLK↑ ENP and ENT after CLK↑ tsu Inactive-state setup time, CLR high before CLK↑† † Inactive-state setup time also is referred to as recovery time. 0 100 MIN 0 5 5 4 4 Low 6 7 5 5 High or low LOAD before CLK↑ Setup time MAX High CLR low Data before CLK↑ MIN 5 5 High 11 11.5 Low 8.5 9.5 High 11 11.5 Low 5 5 High or low 2 2 High 2 2 Low 0 0 High or low 0 0 6 6 MAX UNIT 90 MHz ns ns ns ns switching characteristics (see Note 4) PARAMETER fmax tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPHL FROM (INPUT) TO (OUTPUT) VCC = 4.5 V TO 5.5 V, CL = 50 PF, RL = 500 Ω, TA = MIN TO MAX‡ MIN MAX 100 120 2.7 5.1 7.5 2.7 8.5 2.7 7.1 10 2.7 11 3.2 5.6 8.5 3.2 9.5 3.2 5.6 8.5 3.2 9.5 4.2 9.6 14 4.2 15 4.2 9.6 14 4.2 15 1.7 4.1 7.5 1.7 8.5 1.7 4.1 7.5 1.7 8.5 Any Q 4.7 8.6 12 4.7 13 RCO 3.7 7.6 10.5 3.7 11.5 CLK (LOAD high) Any Q CLK (LOAD low) Any Q CLK RCO ENT RCO CLR VCC = 5 V, CL = 50 PF, RL = 500 Ω, TA = 25°C MIN TYP MAX 90 UNIT MHz ns ns ns ns ns ‡ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. NOTE 4: Load circuits and waveforms are shown in Figure 1. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 7 SN74F161A SYNCHRONOUS 4-BIT BINARY COUNTER SDFS056B – MARCH 1987 – REVISED AUGUST 2001 PARAMETER MEASUREMENT INFORMATION From Output Under Test CL (see Note A) From Output Under Test CL (see Note A) Test Point 500 Ω 7V Open 500 Ω S1 500 Ω TEST S1 tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open Collector Open 7V Open 7V LOAD CIRCUIT FOR 3-STATE AND OPEN-DRAIN OUTPUTS LOAD CIRCUIT FOR TOTEM-POLE OUTPUTS 3V 1.5 V Timing Input 0V tw 3V 1.5 V Input 1.5 V th tsu 3V 1.5 V Data Input 1.5 V 0V 0V VOLTAGE WAVEFORMS PULSE DURATION VOLTAGE WAVEFORMS SETUP AND HOLD TIMES 3V 1.5 V Input 1.5 V 0V tPLH In-Phase Output tPHL 1.5 V 1.5 V VOL tPHL Out-of-Phase Output VOH Output Waveform 1 S1 at 7 V (see Note B) 1.5 V VOH 1.5 V VOL 1.5 V 0V tPZL tPLZ ≈3.5 V 1.5 V tPZH tPLH 1.5 V 3V Output Control Output Waveform 2 S1 at GND (see Note B) VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS VOL + 0.3 V VOL tPHZ 1.5 V VOH – 0.3 V VOH ≈0 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns, duty cycle = 50%. D. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms 8 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PACKAGE OPTION ADDENDUM www.ti.com 14-Oct-2022 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) Samples (4/5) (6) SN74F161AD ACTIVE SOIC D 16 40 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 F161A Samples SN74F161ADR ACTIVE SOIC D 16 2500 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 F161A Samples SN74F161AN ACTIVE PDIP N 16 25 RoHS & Green NIPDAU N / A for Pkg Type 0 to 70 SN74F161AN Samples SN74F161ANSR ACTIVE SO NS 16 2000 RoHS & Green NIPDAU Level-1-260C-UNLIM 0 to 70 74F161A Samples (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