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The NTE74C160 and NTE74C161 (synchronous presettable up) counters are monolithic complementary MOS (CMOS) integrated circuits in a 16−Lead DIP-type package constructed with N− and P−channel enhancement mode transistors. They feature an internal carry look-ahead for fast counting schemes and for cascading packages without additional gating.
A low level at the load input disables counting and causes the outputs to agree with the data input after the next positive clock edge. The clear function for the NTE74C160 and NTE74C161 is asynchronous and a low level at the clear input sets all four outputs low regardless of the state of the clock. Counting is enabled when both count enable inputs are high. Input T is fed forward to also enable the carry out. The carry output is a positive pulse with a duration approximately equal to the positive portion of QA and can be used to enable successive cascaded stages. Logic transitions at the enable P or T inputs can occur when the clock is high or low.
Wide supply range: 3V to 15V
High-noise margin: 1V guaranteed
High-noise immunity: 0.45 VCC (typ)
Tenth power TTL compatible: drives 2 LPTTL loads
Internal look−ahead for fast counting schemes
Carry output for N−Bit cascading
Load control line
Absolute maximum ratings:* Voltage at any pin:** −0.3V to VCC +0.3V
Operating VCC range: 3V to 15V
Absolute maximum VCC: 16V
Operating temperature range, TA: −0° to +70°C
Storage temperature range, Tstg: −65° to +150°C
Lead temperature (during soldering, 10 sec), TL: +300°C
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* "Absolute Maximum Ratings" are those values beyond which th safety of the device cannot be guaranteed. Except for "Operating Temperature Range", they are not meant to imply that the devices should be operated at these limits. The table of "Electrical Characteristics"
provides conditions for actual device operation. ** This device should not be connected during power on conditions.