The HEF4737B and HEF4737V are static quadruple decade counters for frequencies from 0 to 10 MHz. The counters are supplied with an extra overload flip-flop giving a total count capability of 19 999. The counter has the following inputs and outputs: a count input (CP), an asynchronous reset input (MR), an asynchronous preset input (PL), a transfer input (T), an output enable input (EO) (which controls the BCD outputs), the digit select inputs (SA, SB, SC) (which perform selection of the contents of the latches to the 3-state BCD outputs (O0 to O3)), and the carry outputs (CO2 to CO5) (which give the carry signals of the decades except from the first decade). The complementary MOS structure gives the devices very low stand-by and operating dissipation. Operating from a single supply voltage all outputs can drive one standard TTL input without interface circuitry under all specified operating conditions. The BCD digit outputs are LOCMOS 3-state outputs. The high impedance off-state feature allows comm
The HEF4737B and HEF4737V are Philips LSI quadruple static decade counters designed for frequency counting up to 10 MHz. They feature an extra overload flip‑flop that extends the count capability to 19 999 and provide BCD outputs with 3‑state capability.
Both devices are offered in 18‑lead DIL packages (plastic or ceramic) with recommended supply voltages of 3‑15 V for the HEF4737B and 4.5‑12.5 V for the HEF4737V. Electrical characteristics include low standby dissipation, TTL‑compatible outputs, and typical propagation delays of about 220 ns for CP‑to‑CO2 at 5 V.
| Supply voltage (HEF4737B) | 3 V to 15 V |
|---|---|
| Input frequency range | 0 Hz to 10 MHz |
| Maximum count | 19 999 |
| Package type | 18‑lead DIL plastic (SOT102‑1) |
| Package type (ceramic) | 18‑lead DIL ceramic (SOT133B) |
| Propagation delay CP→CO2 (5 V) | 220 ns typical |
Both counters can count up to 19 999 due to an extra overload flip‑flop.
They are specified for frequencies from 0 Hz up to 10 MHz.