74162 Synchronous 4-Bit Counter IC
The 74162 is a synchronous 4-bit binary counter implemented in the TTL (LS) family. It provides four buffered outputs representing a 4-bit binary value and advances the count synchronously on a common clock edge when the enable inputs are asserted. The device supports parallel-loading of a preset value and a clear function, allowing designers to initialize or force any desired start count without ripple delays. Its internal gating makes all bit changes occur in the same clock transition, which simplifies timing in high-speed or cascaded counting applications.
Architecturally the IC includes parallel data inputs, active-low synchronous load and asynchronous clear pins, two enable inputs (for look-ahead expansion) and a ripple-carry / look-ahead output that lets multiple counters be cascaded for wider counters with predictable timing. Because counting is synchronous, hazards and glitches common to ripple counters are minimized; the outputs change in unison, so system timing and metastability are easier to manage.
Housed in standard 16-pin packages (PDIP, SOIC/SOP, CFP/LCCC variants), the 74162 is suited to TTL-based digital designs where a robust, easy-to-cascade binary counter is needed—for example frequency division, digital sequencing, timed state machines, or address generation in small microcontroller systems. Standard commercial temperature and packaging options are provided by the manufacturer.
Features:
- Synchronous 4-bit binary counting.
- Synchronous parallel load (active low).
- Asynchronous clear (reset) input.
- Dual count-enable inputs for expansion/enable control (ENT, ENP).
- Ripple-carry / look-ahead output for easy cascading.
- TTL-LS logic family compatibility (5 V nominal supply).
- Available in multiple 16-pin packages (PDIP, SOIC/SOP, CFP, LCCC).
Specifications:
| Parameter | Value |
|---|---|
| Device family / model: | SN74162 / SN74LS162 (synchronous 4-bit counter). |
| Logic family: | TTL – LS series (low-power Schottky). |
| Nominal Supply Voltage (VCC): | 5 V (typical for LS devices). |
| Operating Temperature (commercial): | 0°C to +70°C (standard SN74LS parts). |
| Pin count / Package: | 16 pins – PDIP, SOIC/SOP, CFP, LCCC (multiple package options). |
| Parallel load: | Synchronous (active-low). |
| Clear / Reset: | Asynchronous clear input. |
| Count enable: | ENT, ENP (dual enables for expansion). |
| Cascade output: | Ripple-carry / look-ahead output (RCO). |
| Typical ordering/packaging: | PDIP: tube 25; SOIC: tape & reel up to 2500; SOP: tape & reel up to 2000 (see part-specific packaging). |
Applications:
- Digital counting and frequency division.
- Programmable sequencing / state machines.
- Address generation / small address counters.
- Timers and interval measurement.
- Cascaded wide counters (multi-bit counters).
Package Contents:
- 1x 74162 Synchronous 4-Bit Counter IC