74AC161 SYNCHRONOUS PRESETTABLE 4-BIT COUNTER ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: fMAX =125 MHz (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 8 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) 50Ω TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24 mA (MIN) BALANCED PROPAGATION DELAYS: tPLH ≅ tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 161 IMPROVED LATCH-UP IMMUNITY DESCRIPTION The AC161 is a high-speed CMOS SYNCRONOUS PRESETTABLE COUNTER fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS technology. It is ideal for low power applications mantaining high speed operation similar to eqivalent Bipolar Schottky TTL. It is a 4 bit binary counter with Asynchronous Clear. The circuit have four fundamental modes of operation, in order of preference: synchronous B M (Plastic Package) (Micro Package) ORDER CODES : 74AC161B 74AC161M reset, parallel load, count-up and hold. Four control inputs, Master Reset (CLEAR), Parallel Enable Input (LOAD), Count Enable Input (PE) and Count Enable Carry Input (TE), determine the mode of operation as shown in the Truth Table. A LOW signal on CLEAR overrides counting and parallel loading and sets all outputs on LOW state. A LOW signal on LOAD overrides counting and allows information on Parallel Data Qn inputs to be loaded into the flip-flops on the next rising edge of CLOCK. With LOAD and CLEAR, PE and TE permit counting when both are HIGH. Conversely, a LOW signal on either PE and TE inhibits counting. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage. PIN CONNECTION AND IEC LOGIC SYMBOLS December 1998 1/12 74AC161 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No 1 SYMBOL CLEAR NAME AND FUNCT ION Master Reset 2 CLOCK Clock Input (LOW-to-HIGH, Edge- Triggered) 3, 4, 5, 6 A, B, C, D Data Inputs 7 PE Count Enable Input 10 TE Count Enable Carry Input 9 LOAD 14, 13, 12, 11 15 QA to QD 8 CARRY OUT GND 16 VCC Parallel Enable Input Flip-Flop Outpus Terminal Count Output Ground (0V) Positive Supply Voltage TRUTH TABLE INPUT S O UT PUT S CLEAR LOAD PE TE CL OCK X QB QC FUNCT ION QD L X X X H L X X H H X L NO CHANGE NO COUNT H H L X NO CHANGE NO COUNT H H H H COUNT UP COUNT H X X X NO CHANGE NO COUNT NOTE: X:Don’t Care A,B, C,D: Logic level of data input CARRY OUT=TE • QA • QB • QC • QD LOGIC DIAGRAMS 2/12 QA L L L L RESET TO ”0” A B C D PRESET DATA 74AC161 TIMING CHART 3/12 74AC161 ABSOLUTE MAXIMUM RATINGS Symbol VCC Parameter Supply Voltage Value Unit -0.5 to +7 V VI DC Input Voltage -0.5 to VCC + 0.5 V VO DC Output Voltage -0.5 to VCC + 0.5 V IIK DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Current ICC or IGND DC VCC or Ground Current Tstg Storage Temperature TL Lead Temperature (10 sec) ± 50 mA ± 300 mA -65 to +150 o 300 o C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS Symbol VCC Parameter Supply Voltage Unit 2 to 6 V V VI Input Voltage 0 to VCC VO Output Voltage 0 to VCC Top dt/dv Operating Temperature: Input Rise and Fall Time VCC = 3.0, 4.5 or 5.5 V(note 1) 1) VIN from 30% to70%of VCC 4/12 Valu e -40 to +85 8 V o C ns/V 74AC161 DC SPECIFICATIONS Symb ol Parameter Test Co nditions VIH High Level Input Voltage 3.0 4.5 VO = 0.1 V or VCC - 0.1 V 5.5 VIL Low Level Input Voltage 3.0 4.5 Valu e T A = 25 oC V CC (V) Min. T yp. 2.1 1.5 2.1 3.15 2.25 3.15 3.85 2.75 VO = 0.1 V or VCC - 0.1 V 5.5 VOH High Level Output Voltage 3.0 4.5 Min. Max. V 3.85 1.5 0.9 0.9 2.25 1.35 1.35 2.75 1.65 1.65 I O =-50 µA 2.9 2.99 2.9 IO=-50 µA 4.4 4.49 4.4 5.49 IO=-50 µA 5.4 2.56 2.46 4.5 IO=-24 mA 3.86 3.76 5.5 IO=-24 mA 4.86 3.0 IO=50 µA 0.002 0.1 0.1 IO=50 µA 0.001 0.1 0.1 IO=50 µA IO=12 mA 0.001 0.1 0.1 0.36 0.44 0.36 0.44 0.36 0.44 3.0 Low Level Output Voltage VI = V IH or V IL Max. IO=-12 mA 5.5 VOL (* ) Un it -40 to 85 o C 4.5 5.5 3.0 4.5 5.5 (* ) VI = V IH or V IL IO=24 mA IO=24 mA 5.4 V V 4.76 V Input Leakage Current 5.5 VI = VCC or GND ±0.1 ±1 µA ICC Quiescent Supply Current 5.5 VI = VCC or GND 8 80 µA IOLD Dynamic Output Current (note 1, 2) 5.5 VOLD = 1.65 V max 75 mA VOHD = 3.85 V min -75 mA II IOHD 1) Maximum test duration 2ms, one output loaded attime 2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50 Ω. (*) All outputs loaded. 5/12 74AC161 AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = tf =3 ns) Symb ol Parameter T est Con ditio n V CC (V) Valu e T A = 25 oC -40 to Min. T yp. Max. Min. 7.0 12.0 5.0 9.0 Un it 85 o C Max. 13.0 10.0 tPLH tPHL Propagation Delay Time CK to Q 3.3(*) 5.0(**) tPLH tPHL Propagation Delay Time CK to CARRY OUT 3.3(*) 5.0(**) 8.5 6.0 14.0 10.0 15.0 11.0 tPLH tPHL Propagation Delay Time TE to CARRY OUT 3.3(*) 5.5 9.5 11.0 5.0 (**) 3.5 6.5 7.5 tPHL Propagation Delay Time CLR to Q 3.3(*) 5.0(**) 6.5 5.5 12.0 9.0 13.0 10.0 ns tPHL Propagation Delay Time CLR to CARRY OUT 3.3 5.0(**) (*) 7.0 5.5 12.0 9.5 13.0 10.0 ns twL CLR pulse Width, LOW (LOAD) 3.3(*) 5.0(**) 3.0 2.5 5.5 4.5 7.5 6.0 ns tw CK pulse Width HIGH or LOW 3.3(*) 2.0 3.5 4.0 5.0 (**) 2.0 3.0 3.5 ts Setup Time HIGH or LOW (INPUT to CLOCK) 3.3(*) 5.0(**) 4.0 1.5 13.5 8.5 16.0 10.5 ns th Hold Time HIGH or LOW (INPUT to CLOCK) 3.3(*) 5.0(**) -1.0 -0.5 -1.0 0.5 0.5 1.0 ns ts Setup Time HIGH or LOW (CLEAR to CLOCK) 3.3(*) 5.0(**) 3.0 2.0 11.5 7.5 14.0 8.5 ns th Hold Time HIGH or LOW (CLEAR to CLOCK) 3.3(*) -2.5 0 0 5.0 (**) -2.0 0.5 1.0 ts Setup Time HIGH or LOW (PE or TE to CLOCK) 3.3(*) 5.0(**) 3.0 2.0 6.0 4.5 7.0 5.0 ns th Hold Time HIGH or LOW (PE or TE to CLOCK) 3.3 5.0(**) (*) -3.5 -2.0 0 0 0 0.5 ns tREM Recovery Time CLR to CLOCK 3.3(*) 5.0(**) -1.0 -0.5 0 0.5 0.5 1.0 ns fMAX Maximum Clock Frequency 3.3(*) (**) 5.0 70 110 60 110 165 95 ns ns ns ns ns MHz (*) Voltage range is 3.3V ± 0.3V (**) Voltage range is 5V ± 0.5V CAPACITIVE CHARACTERISTICS Symb ol Parameter Test Co nditions C IN Input Capacitance 5.0 CPD Power Dissipation Capacitance (note 1) 5.0 Valu e T A = 25 oC V CC (V) Min. fIN = 10 MHz T yp. Max. Un it -40 to 85 o C Min. Max. 4.5 pF 45 pF 1) CPD isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. (Referto Test Circuit).Average operting current can be obtained by the following equation. ICC(opr) = CPD • VCC • fIN + ICC/n(per circuit) 6/12 74AC161 TEST CIRCUIT CL = 50 pF or equivalent (includes jigand probe capacitance) RL = R1 = 500Ω orequivalent RT = ZOUT of pulse generator (typically 50Ω) WAVEFORM 1: PROPAGATION DELAYS, COUNT MODE (f=1MHz; 50% duty cycle) 7/12 74AC161 WAVEFORM 2: PROPAGATION DELAYS CLEAR MODE (f=1MHz; 50% duty cycle) WAVEFORM 3: PROPAGATION DELAYS PRESET MODE (f=1MHz; 50% duty cycle) 8/12 74AC161 WAVEFORM 4: PROPAGATION DELAYS COUNTEABLE MODE (f=1MHz; 50% duty cycle) WAVEFORM 5: PROPAGATION DELAYS CASCADE MODE (f=1MHz; 50% duty cycle) 9/12 74AC161 Plastic DIP-16 (0.25) MECHANICAL DATA mm DIM. MIN. a1 0.51 B 0.77 TYP. inch MAX. MIN. TYP. MAX. 0.020 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L Z 3.3 0.130 1.27 0.050 P001C 10/12 74AC161 SO-16 MECHANICAL DATA mm DIM. MIN. TYP. A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.2 a2 MAX. 0.004 0.007 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 e3 0.050 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M S 0.62 0.024 8 (max.) P013H 11/12 74AC161 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics 1998 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com . 12/12