74192 Synchronous Up/Down 4-Bit BCD Counter IC | Pro Tronix

Product Description

The 74192 Synchronous Up/Down 4-Bit BCD Counter IC is a high-speed logic integrated circuit designed for dual-clock counting, digital timing, and decade sequence operations. Featuring separate Up and Down clock inputs, this presettable decade counter counts synchronously from 0 to 9 in standard Binary Coded Decimal (BCD) format and provides automatic reset or wrap-around functionality for multi-stage counting chains.

Engineered with asynchronous parallel load capabilities and direct clear overrides, the 74192 allows immediate pre-loading of 4-bit data vectors (A, B, C, D) to set starting count values. Dedicated Terminal Count Up (TCU) and Terminal Count Down (TCD) outputs enable seamless cascading across multiple ICs without requiring external logic gates. Housed in a standard 16-pin DIP package, it operates on a standard 5V DC supply and interfaces directly with 5V TTL and CMOS logic levels. It is an essential component for digital clocks, frequency dividers, automated batch counters, and digital logic training kits with microcontrollers like Arduino, STM32, or discrete TTL setups.

⚠️ Clocking & Cascading Tip: The 74192 utilizes separate Count Up (CPU) and Count Down (CPD) clock inputs. For proper synchronous counting, hold the unused clock input HIGH while pulsing the active clock line on its low-to-high (rising) edge. Driving the Asynchronous Clear (CLR) pin HIGH instantly resets all output flip-flops to zero regardless of clock states.

Technical & Logic Architecture

This presettable decade counter offers complete counting flexibility:

• Dual Clock Architecture: Independent Count Up (CPU) and Count Down (CPD) clock pins for bidirectional counting logic.

• Cascading Outputs: Active-LOW Terminal Count Up (TCU) and Down (TCD) pins to trigger subsequent counter stages directly.

• Asynchronous Parallel Load: Active-LOW Parallel Load (PL) pin to instantly load pre-set BCD data from inputs A, B, C, D.

• Breadboard-Friendly Package: Standard 16-pin Dual In-Line Package (DIP-16) for easy insertion into breadboards and IC sockets.

74192 Truth Table (Function Table)

Key Terms for Truth Table:

• H: High Voltage Level (Logic 1)

• L: Low Voltage Level (Logic 0)

• X: Don’t Care (Can be High or Low)

• Rising Edge: Low-to-High transition of the Clock signal

• QA0, QB0, QC0, QD0: Output levels before the indicated input conditions were established

74192 Pinout Description & Logic Functions

• Pin 1 – B (Parallel Input B): Data input line for loading bit position B (bit 1).

• Pin 2 – QB (Parallel Output B): BCD output bit 1 (weight 2).

• Pin 3 – QA (Parallel Output A): BCD output bit 0 (weight 1).

• Pin 4 – CPD (Count Down Clock Input): Clock input for decrementing count on low-to-high transition (keep CPU HIGH during down-count).

• Pin 5 – CPU (Count Up Clock Input): Clock input for incrementing count on low-to-high transition (keep CPD HIGH during up-count).

• Pin 6 – QC (Parallel Output C): BCD output bit 2 (weight 4).

• Pin 7 – QD (Parallel Output D): BCD output bit 3 (weight 8).

• Pin 8 – GND: Ground reference pin (0V).

• Pin 9 – D (Parallel Input D): Data input line for loading bit position D (bit 3).

• Pin 10 – C (Parallel Input C): Data input line for loading bit position C (bit 2).

• Pin 11 – PL (Parallel Load Input): Asynchronous parallel load pin (Active LOW).

• Pin 12 – TCU (Terminal Count Up Output): Active-LOW carry output for cascading up-counting stages (pulses LOW when count reaches 9 and CPU goes LOW).

• Pin 13 – TCD (Terminal Count Down Output): Active-LOW borrow output for cascading down-counting stages (pulses LOW when count reaches 0 and CPD goes LOW).

• Pin 14 – CLR (Clear Input): Asynchronous master reset pin (Active HIGH). Driving this pin HIGH forces outputs QA through QD to LOW.

• Pin 15 – A (Parallel Input A): Data input line for loading bit position A (bit 0).

• Pin 16 – VCC: Power supply input pin (+5V DC nominal).

Operating Modes Summary

1. Count Up Mode: Hold CPD HIGH, pulse CPU from LOW to HIGH. Outputs count sequentially from 0000 (0) to 1001 (9) BCD.

2. Count Down Mode: Hold CPU HIGH, pulse CPD from LOW to HIGH. Outputs count down sequentially from 1001 (9) to 0000 (0) BCD.

3. Parallel Load Mode: Drive PL LOW to immediately copy binary data from pins A, B, C, D to outputs QA, QB, QC, QD.

4. Master Clear: Drive CLR HIGH to instantly reset all four output lines to 0000.

Applications

• Digital Clocks & Timers: Cascading multiple stages to count seconds, minutes, and hours for 7-segment LED displays.

• Frequency Division: Dividing clock pulse frequencies in custom digital logic circuits.

• Industrial Batch Counting: Tracking items on automated assembly lines in both incrementing and decrementing directions.

Technical Specifications

What’s in the Box

• 1 x 74192 Synchronous Up/Down 4-Bit BCD Counter IC (DIP-16).

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🛠️ Complete Your Breadboard Setup

To quickly wire and test the 74192 Synchronous Up/Down Counter IC without soldering, make sure to check out our collection of breadboards, prototype boards, and jumper wires:

• Breadboards & Prototype PCBs: Explore our full range of solderless breadboards and prototyping boards for easy circuit assembly: Pro Tronix Breadboards & PCBs

• Jumper Wires & Connecting Cables: Grab high-quality male-to-male and male-to-female jumper wires to connect your IC pins to power and signal lines: Pro Tronix Wires & Cables Collection