TECHNICAL DATA IN74AC161 Presettable Counter High-Speed Silicon-Gate CMOS The IN74AC161 is identical in pinout to the LS/ALS161, HC/HCT161. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. The IN74AC161 is programmable 4-bit synchronous modulo-16 counter that feature parallel Load, asynchronous Reset, a Carry Output for cascading and count-enable controls. The IN74AC161 is binary counter with asynchronous Reset. • Outputs Directly Interface to CMOS, NMOS, and TTL • Operating Voltage Range: 2.0 to 6.0 V • Low Input Current: 1.0 µA; 0.1 µA @ 25° C • High Noise Immunity Characteristic of CMOS Devices • Outputs Source/Sink 24 mA ORDERING INFORMATION IN74AC161N Plastic IN74AC161D SOIC TA = -40° to 85° C for all packages LOGIC DIAGRAM PIN ASSIGNMENT Outputs PIN 16 =VCC PIN 8 = GND FUNCTION TABLE Inputs Outputs Reset Load Enable P Enable T Clock Q0 Q1 Q2 Q3 Function L X X X X L L L L Reset to “0” H L X X P0 P1 P2 P3 Preset Data 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 X=don’t care P0,P1,P2,P3 = logic level of Data inputs Ripple Carry Out = Enable T • Q0 • Q1 • Q2 • Q3 213 IN74AC161 MAXIMUM RATINGS* Symbol Parameter Value Unit -0.5 to +7.0 V VCC DC Supply Voltage (Referenced to GND) VIN DC Input Voltage (Referenced to GND) -0.5 to VCC +0.5 V DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V DC Input Current, per Pin ±20 mA IOUT DC Output Sink/Source Current, per Pin ±50 mA ICC DC Supply Current, VCC and GND Pins ±50 mA PD Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ 750 500 mW -65 to +150 °C 260 °C VOUT IIN Tstg TL Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. +Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C SOIC Package: : - 7 mW/°C from 65° to 125°C RECOMMENDED OPERATING CONDITIONS Symbol VCC VIN, VOUT DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) TJ Junction Temperature (PDIP) TA Operating Temperature, All Package Types IOH Output Current - High IOL Output Current - Low tr, tf * Parameter Input Rise and Fall Time (except Schmitt Inputs) * Min Max Unit 2.0 6.0 V 0 VCC V 140 °C +85 °C -24 mA 24 mA 150 40 25 ns/V -40 VCC =3.0 V VCC =4.5 V VCC =5.5 V 0 0 0 VIN from 30% to 70% VCC This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND≤(VIN or VOUT)≤VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open. 214 IN74AC161 DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) VCC Guaranteed Limits V 25 °C -40°C to 85°C Unit VOUT=0.1 V or VCC-0.1 V 3.0 4.5 5.5 2.1 3.15 3.85 2.1 3.15 3.85 V Maximum Low Level Input Voltage VOUT= VCC-0.1 V or 0.1 V 3.0 4.5 5.5 0.9 1.35 1.65 0.9 1.35 1.65 V Minimum High-Level Output Voltage IOUT ≤ -50 µA 3.0 4.5 5.5 2.9 4.4 5.4 2.9 4.4 5.4 V 3.0 4.5 5.5 2.56 3.86 4.86 2.46 3.76 4.76 3.0 4.5 5.5 0.1 0.1 0.1 0.1 0.1 0.1 VIN=VIH or VIL IOL=12 mA IOL=24 mA IOL=24 mA 3.0 4.5 5.5 0.36 0.36 0.36 0.44 0.44 0.44 Maximum Input Leakage Current VIN=VCC or GND 5.5 ±0.1 ±1.0 µA IOLD +Minimum Dynamic Output Current VOLD=1.65 V Max 5.5 75 mA IOHD +Minimum Dynamic Output Current VOHD=3.85 V Min 5.5 -75 mA ICC Maximum Quiescent Supply Current (per Package) VIN=VCC or GND 5.5 8.0 µA Symbol Parameter VIH Minimum High-Level Input Voltage VIL VOH Test Conditions * VIN=VIH or VIL IOH=-12 mA IOH=-24 mA IOH=-24 mA VOL Maximum Low-Level Output Voltage IOUT ≤ 50 µA V * IIN 8.0 * All outputs loaded; thresholds on input associated with output under test. +Maximum test duration 2.0 ms, one output loaded at a time. Note: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC 215 IN74AC161 AC ELECTRICAL CHARACTERISTICS(CL=50pF,Input tr=tf=3.0 ns) VCC* Symbol Parameter Guaranteed Limits 25 °C V Min -40°C to 85°C Max Min Unit Max fmax Maximum Clock Frequency (Figure 1) 3.3 5.0 70 110 60 95 tPLH Propagation Delay, Clock to Q (Figure 1) 3.3 5.0 2.0 1.5 12.0 9.0 1.5 1.0 13.5 9.5 ns tPHL Propagation Delay, Clock to Q (Figure 1) 3.3 5.0 1.5 1.5 12.0 9.5 1.5 1.5 13.0 10.0 ns tPLH Propagation Delay, Clock to Ripple Carry Out (Figure 1) 3.3 5.0 3.0 2.0 15.0 10.5 2.5 1.5 16.5 11.5 ns tPHL Propagation Delay, Clock to Ripple Carry Out (Figure 1) 3.3 5.0 3.5 2.0 14.0 11.0 2.5 2.0 15.5 11.5 ns tPLH Propagation Delay, Enable T to Ripple Carry Out (Figure 3) 3.3 5.0 2.0 1.5 9.5 6.5 1.5 1.0 11.0 7.5 ns tPHL Propagation Delay, Enable T to Ripple Carry Out (Figure 3) 3.3 5.0 2.5 2.0 11.0 8.5 2.0 1.5 12.5 9.5 ns tPHL Propagation Delay, Reset to Q (Figure 2) 3.3 5.0 2.0 1.5 12.0 9.5 1.5 1.5 13.5 10.0 ns tPHL Propagation Delay, Reset to Ripple Carry Out (Figure 2) 3.3 5.0 3.5 2.5 15.0 13.0 3.0 2.5 17.5 13.5 ns CIN Maximum Input Capacitance 5.0 4.5 MHz 4.5 pF Typical @25°C,VCC=5.0 V CPD Power Dissipation Capacitance Voltage Range 3.3 V is 3.3 V ±0.3 V Voltage Range 5.0 V is 5.0 V ±0.5 V * 216 45 pF IN74AC161 TIMING REQUIREMENTS (CL=50pF,Input tr=tf=3.0 ns) VCC* Symbol Parameter Guaranteed Limit V +25° C -40° C to +85° C Unit tsu Minimum Setup Time, Preset Data Inputs to Clock (Figure 4) 3.3 5.0 13.5 8.5 16.0 10.5 ns th Minimum Hold Time, Clock to Preset Data Inputs (Figure 4) 3.3 5.0 -1.0 0 -0.5 0 ns tsu Minimum Setup Time,Load to Clock (Figure 4) 3.3 5.0 11.5 7.5 14.0 8.5 ns th Minimum Hold Time, Clock to Load (Figure 4) 3.3 5.0 0 0.5 0 1.0 ns tsu Minimum Setup Time, Enable T or Enable P to Clock (Figure 5) 3.3 5.0 6.0 4.5 7.0 5.0 ns th Minimum Hold Time, Clock to Enable T or Enable P (Figure 5) 3.3 5.0 0 0 0 0.5 ns tw Minimum Pulse Width, Clock (Load) (Figure 1) 3.3 5.0 3.5 2.5 4.0 3.0 ns tw Minimum Pulse Width, Clock (Count)(Figure 1) 3.3 5.0 4.0 3.0 4.5 3.5 ns tw Minimum Pulse Width, Reset (Figure 2) 3.3 5.0 5.5 4.5 7.5 6.0 ns trec Minimum Recovery Time, Reset to Clock (Figure 2) 3.3 5.0 -0.5 0 0 0.5 ns Voltage Range 3.3 V is 3.3 V ±0.3 V Voltage Range 5.0 V is 5.0 V ±0.5 V * 217 IN74AC161 Figure 1. Switching Waveform Figure 2. Switching Waveform Figure 3. Switching Waveform Figure 4. Switching Waveform Figure 5. Switching Waveform 218 IN74AC161 Sequence illustrated in waveforms: 1. Reset outputs to zero. 2. Preset to binary twelve. 3. Count to thirteen, fourteen, fifteen, zero, one, and two. 4. Inhibit. Figure 8. Timing Diagram 219 IN74AC161 EXPANDED LOGIC DIARAM 220