BINARY PRESET P0 15 ASYN. PARALLEL 11 LOAD ENABLE 3 2 CLOCK 6 7 UP/DOWN Q0 Q1 BINARY OUTPUTS
The CD54AC191/3A and CD54ACT191/3A are asynchronously presettable binary up/down synchronous counters that utilize the Harris Advanced CMOS Logic technology. Presetting the counter to the number on preset data inputs (P0-P3) is accomplished by setting LOW the asynchronous parallel load input (PL). Counting occurs when PL is HIGH. Count Enable (CE) is LOW, and the Up/Down (U/D) input is either LOW for up-counting or HIGH for down-counting. The counter is incremented or decremented synchronously with the LOW-to-HIGH transition of the clock. When an overflow or underflow of the counter occurs, the Terminal Count (TC) output, which is LOW during counting, goes HIGH and remains HIGH for one clock cycle. This output can be used for look-ahead carry in high-speed cascading. The TC output also initiates the Ripple Clock (RC) output which, normally HIGH, goes LOW and remains LOW for the low-level portion of the clock pulse. These counters can be cascaded using the Ripple Count output. The CD54AC191/3A and CD54ACT191/3A are supplied in 16-lead dual-in-line ceramic packages (F suffix).
ACT INPUT LOAD TABLE INPUT P3, PL CL, U/D, CE NOTE: 1. Unit load is ICC limit specified in DC Electrical Specifications Table, e.g., 2.4mA Max at +25oC. UNIT LOAD (NOTE 0.75 0.85
DC Supply Voltage, VCC. +6V DC Input Diode Current, IIK For VI > VCC 0.5V.�20mA DC Output Diode Current, IOK For VO > VCC 0.5V.�50mA DC Output Source or Sink Current, Per Output Pin, IO For VO < VCC 0.5V.�50mA DC VCC or GND Current, ICC or IGND For to 4 Outputs Per Device, Add �25mA For Each Additional Output.�100mA Power Dissipation Per Package, to +100oC (Package F). to +125oC (Package F). Derate Linearly to 300mW Operating Temperature Range, TA Package Type to +125oC Storage Temperature, TSTG. to +150oC Lead Temperature (During Soldering) At Distance � 0.79mm) From Case For 10s Max. +265oC Unit Inserted Into a PC Board (Min Thickness 1/16in., 1.59mm) With Solder Contacting Lead Tips Only. +300oC
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
Supply Voltage Range, VCC Unless Otherwise Specified, All Voltages Referenced to GND TA = Full Package Temperature Range 5.5V DC Input or Output Voltage, VI, VO. 0V to VCC Operating Temperature, TA. to +125oC Input Rise and Fall Slew Rate, dt/dv to 3V (AC Types). to 5.5V (AC Types). to 5.5V (AC Types). to 10ns/V
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures. Copyright